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  • LME49720 デュアル高性能、Hi-Fiオーディオ・オペアンプ

    • JAJSBH0D March   2007  – November 2016 LME49720

      PRODUCTION DATA.  

  • CONTENTS
  • SEARCH
  • LME49720 デュアル高性能、Hi-Fiオーディオ・オペアンプ
  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 デバイス比較表
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Distortion Measurements
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Capacitive Load
      2. 9.3.2 Balance Cable Driver
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Single Ended Converter
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Surface Mount Capacitors
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Other Applications
  11. 11Power Supply Recommendations
    1. 11.1 Power Supply Decoupling Capacitors
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Component Placement
    2. 12.2 Layout Example
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 ドキュメントの更新通知を受け取る方法
    2. 13.2 コミュニティ・リソース
    3. 13.3 商標
    4. 13.4 静電気放電に関する注意事項
    5. 13.5 Glossary
  14. 14メカニカル、パッケージ、および注文情報
  15. 重要なお知らせ

パッケージ・オプション

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DATA SHEET

LME49720 デュアル高性能、Hi-Fiオーディオ・オペアンプ

このリソースの元の言語は英語です。 翻訳は概要を便宜的に提供するもので、自動化ツール (機械翻訳) を使用していることがあり、TI では翻訳の正確性および妥当性につきましては一切保証いたしません。 実際の設計などの前には、ti.com で必ず最新の英語版をご参照くださいますようお願いいたします。

1 特長

  • 600Ωの負荷を容易に駆動
  • オーディオ信号の優れた忠実性のため最適化
  • 出力短絡保護
  • 120dB (標準値)を超えるPSRRおよびCMRR
  • SOIC、PDIP、TO-99 Metal Canパッケージ
  • 主な仕様
    • 電源電圧範囲: ±2.5～±17V
    • THD+N (AV = 1、VOUT = 3VRMS、fIN = 1kHz):
      • RL = 2kΩ: 0.00003% (標準値)
      • RL = 600Ω: 0.00003% (標準値)
    • 入力ノイズ密度: 2.7nV/√Hz (標準値)
    • スルー・レート: ±20V/μs (標準値)
    • ゲイン帯域幅積: 55MHz (標準値)
    • 開ループ・ゲイン(RL = 600Ω): 140dB (標準値)
    • 入力バイアス電流: 10nA (標準値)
    • 入力オフセット電圧: 0.1mV (標準値)
    • DCゲイン直線性誤差: 0.000009%

2 アプリケーション

  • 超高品質のオーディオ・アンプ
  • Hi-Fiプリアンプ
  • Hi-Fiマルチメディア
  • 最先端のフォノ・プリアンプ
  • プロフェッショナル用高性能オーディオ
  • Hi-Fiイコライゼーションおよびクロスオーバー・ネットワーク
  • 高性能ライン・ドライバ
  • 高性能ライン・レシーバ
  • Hi-Fiアクティブ・フィルタ

3 概要

LME49720デバイスは超低歪み、低ノイズ、高スルー・レートのオペアンプ・シリーズの製品であり、高性能のHi-Fiアプリケーション用に最適化され、完全に規定されています。高度な最新のプロセス・テクノロジと、最先端の回路設計との組み合わせにより、LME49720オーディオ・オペアンプ・ドライバは優れたオーディオ信号アンプとして、比類のないオーディオ性能を実現します。LME49720は、非常に低い電圧ノイズ密度(2.7nV/√Hz)と、ほぼ無視できるTHD+N (0.00003%)との両立により、最も厳しいオーディオ・アプリケーションの要求も容易に満たすことができます。

製品情報(1)

型番 パッケージ 本体サイズ（公称）
LME49720 TO-99 (8) 9.08mm×9.08mm
SOIC (8) 4.90mm×3.91mm
PDIP (8) 9.81mm×6.35mm
  1. 提供されているすべてのパッケージについては、データシートの末尾にある注文情報を参照してください。

パッシブ・イコライゼーションのRIAAフォノ・プリアンプ

LME49720 300038k5.gif

4 改訂履歴

Changes from C Revision (April 2013) to D Revision

  • 「製品情報」表、「ESD定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加Go
  • Changed RθJA values for D and P packages from 145 °C/W to 107.9 °C/W (D) and from 102 °C/W to 72.9 °C/W (P) in the Thermal Information table.Go

5 デバイス比較表

デバイスの製品番号 アンプのタイプ チャネル数 出力電流(mA) 入力ノイズ密度(nV/rtHz) THD+N (%)
LME49710 オーディオ・オペアンプ 1 37 2.5 0.00003
LME49720 オーディオ・オペアンプ 2 26 2.7 0.00003
LME49721 オーディオ・オペアンプ 2 100 4 0.0002
LME49723 オーディオ・オペアンプ 2 25 3.2 0.0002

6 Pin Configuration and Functions

D Package
8 Pin SOIC
Top View
LME49720 pinput_SOIC.gif
P Packages
8 Pin PDIP
Top View
LME49720 pinput_PDIP.gif
LMC Package
8 Lead TO-99
LME49720 300038f3.gif

Pin Functions

PIN I/O DESCRIPTION
NAME SOIC PDIP TO-99
V+ 8 8 8 - Positive supply voltage
V- 4 4 4 - Negative supply voltage
InputA- 2 2 2 I Negative audio input
InputA+ 3 3 3 I Positive audio input
Output A 1 1 1 O Audio output A
InputB– 6 6 6 I Negative audio input
InputB+ 5 5 5 I Positive audio input
Output B 7 7 7 O Audio output B

7 Specifications

7.1 Absolute Maximum Ratings

see (1)(3)(2)
MIN MAX UNIT
Power Supply Voltage   (VS = V+ – V–) 36 V
Input Voltage (V–) – 0.7V (V+) + 0.7 V
Output Short Circuit (4) Continuous
Power Dissipation Internally Limited
Junction Temperature 150 °C
Temperature Range TMIN ≤ TA ≤ TMAX –40 85 °C
Supply Voltage Range ±2.5V ≤ VS ≤ ± 17V V
Storage Temperature −65 150 °C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.
(3) Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For enusred specifications and test conditions, see Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
(4) Amplifier output connected to GND, any number of amplifiers within a package.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM) (1) All pins 2000 V
Machine Model (MM), per EIAJ IC-121-1981Application and Implementation Pins 1, 4, 7 and 8 200
Pins 2, 3, 5 and 6 100
(1) Human body model, 100pF discharged through a 1.5kΩ resistor.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
V+,V– Supply voltage ±2.5 ±17 V
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 150 °C

7.4 Thermal Information

THERMAL METRIC(1) LME49720 UNIT
D
(SOIC)		 P
(PDIP)		 LMC
(TO-99)(2)
8 PINS 8 PINS 8 PINS
RθJA Junction-to-ambient thermal resistance 107.9 72.9 150 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 52 77.2 35 °C/W
RθJB Junction-to-board thermal resistance 48.3 44.9 – °C/W
ψJT Junction-to-top characterization parameter 8.2 35.7 – °C/W
ψJB Junction-to-board characterization parameter 47.8 49.9 – °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance N/A N/A – °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.
(2) Thermal performance of a TO-99 package will depend strongly on mounting condition and there is no standard mounting configuration on a JEDEC PCB for that package type.

7.5 Electrical Characteristics

The following specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz, and TA = 25°C, unless otherwise specified.
PARAMETER TEST CONDITIONS MIN(2) TYP (1) MAX(2) UNIT
THD+N Total harmonic distortion + noise AV = 1, VOUT = 3Vrms
 RL = 2kΩ
 RL = 600Ω		 0.00003
0.00003
0.00009 %
IMD Intermodulation distortion AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1		 0.00005 %
GBWP Gain bandwidth product 45 55 MHz
SR Slew rate ±15 ±20 V/μs
FPBW Full power bandwidth VOUT = 1VP-P, –3dB
referenced to output magnitude
at f = 1kHz		 10 MHz
ts Settling time AV = –1, 10V step, CL = 100pF
0.1% error range		 1.2 μs
en Equivalent input noise voltage fBW = 20Hz to 20kHz 0.34 0.65 μVRMS
Equivalent input noise density f = 1kHz
f = 10Hz		 2.7
6.4		 4.7 nV/√Hz
in Current noise density f = 1kHz
f = 10Hz		 1.6
3.1		 pA/√Hz
VOS Offset voltage ±0.1 ±0.7 mV
ΔVOS/ΔTemp Average input offset voltage drift vs temperature –40°C ≤ TA ≤ 85°C 0.2 μV/°C
PSRR Average input offset voltage shift vs power supply voltage ΔVS = 20V (3) 110 120 dB
ISOCH-CH Channel-to-Channel isolation fIN = 1kHz
fIN = 20kHz		 118
112		 dB
IB Input bias current VCM = 0V 10 72 nA
ΔIOS/ΔTemp Input bias current drift vs temperature –40°C ≤ TA ≤ 85°C 0.1 nA/°C
IOS Input offset current VCM = 0V 11 65 nA
VIN-CM Common-Mode input voltage range (V+) – 2.0
(V-) + 2.0		 +14.1
–13.9		 V
CMRR Common-Mode rejection –10V<Vcm<10V 110 120 dB
ZIN Differential input impedance 30 kΩ
Common mode input impedance –10V<Vcm<10V 1000 MΩ
AVOL Open loop voltage gain –10V<Vout<10V, RL = 600Ω 125 140 dB
–10V<Vout<10V, RL = 2kΩ 140
–10V<Vout<10V, RL = 10kΩ 140
VOUTMAX Maximum output voltage swing RL = 600Ω ±12.5 ±13.6 V
RL = 2kΩ ±14.0
RL = 10kΩ ±14.1
IOUT Output current RL = 600Ω, VS = ±17V ±23 ±26 mA
IOUT-CC Instantaneous short circuit current +53
–42		 mA
ROUT Output impedance fIN = 10kHz
Closed-Loop
Open-Loop		 0.01
13		 Ω
CLOAD Capacitive load drive overshoot 100pF 16 %
IS Total quiescent current IOUT = 0mA 10 12 mA
(1) Typical specifications are specified at +25ºC and represent the most likely parametric norm.
(2) Tested limits are ensured to AOQL (Average Outgoing Quality Level).
(3) PSRR is measured as follows: VOS is measured at two supply voltages, ±5V and ±15V. PSRR = | 20log(ΔVOS/ΔVS) |.

7.6 Typical Characteristics

LME49720 300038k6.gif
Figure 1. Thd+N vs Output Voltage VCC = 15V, VEE = –15V RL = 2kΩ
LME49720 300038k8.gif
Figure 3. Thd+N vs Output Voltage VCC = 17V, VEE = –17v RL = 2kΩ
LME49720 300038k9.gif
Figure 5. Thd+N vs Output Voltage VCC = 15V, VEE = –15V RL = 600Ω
LME49720 300038l1.gif
Figure 7. Thd+N vs Output Voltage VCC = 17V, VEE = –17V RL = 600Ω
LME49720 300038l2.gif
Figure 9. Thd+N vs Output Voltage VCC = 15V, VEE = –15V RL = 10kΩ
LME49720 300038l4.gif
Figure 11. Thd+N vs Output Voltage VCC = 17V, VEE = –17V RL = 10kΩ
LME49720 30003863.gif
Figure 13. Thd+N vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS RL = 2kΩ
LME49720 30003864.gif
Figure 15. Thd+N vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS RL = 2kΩ
LME49720 300038k3.gif
Figure 17. Thd+N vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS RL = 600Ω
LME49720 30003867.gif
Figure 19. Thd+N vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS RL = 10kΩ
LME49720 30003868.gif
Figure 21. Thd+N vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS RL = 10kΩ
LME49720 300038e5.gif
Figure 23. IMD vs Output Voltage VCC = 12V, VEE = –12V RL = 2kΩ
LME49720 300038e7.gif
Figure 25. IMD vs Output Voltage VCC = 17V, VEE = –17V RL = 2kΩ
LME49720 300038e0.gif
Figure 27. IMD vs Output Voltage VCC = 12V, VEE = –12V RL = 600Ω
LME49720 300038e1.gif
Figure 29. IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 600Ω
LME49720 300038f0.gif
Figure 31. IMD vs Output Voltage VCC = 12V, VEE = –12V RL = 10kΩ
LME49720 300038l6.gif
Figure 33. IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 10kΩ
LME49720 300038h7.gif
Figure 35. Current Noise Density vs Frequency
LME49720 300038c9.gif
Figure 37. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 10VRMS AV = 0dB, RL = 2kΩ
LME49720 300038c7.gif
Figure 39. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 10VRMS AV = 0dB, RL = 2kΩ
LME49720 300038d1.gif
Figure 41. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 10VRMS AV = 0dB, RL = 2kΩ
LME49720 300038d6.gif
Figure 43. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS AV = 0dB, RL = 600Ω
LME49720 300038d4.gif
Figure 45. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS AV = 0dB, RL = 600Ω
LME49720 300038d8.gif
Figure 47. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS AV = 0dB, RL = 600Ω
LME49720 300038d2.gif
Figure 49. Crosstalk vs Frequency VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS AV = 0dB, RL = 600Ω
LME49720 300038n7.gif
Figure 51. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 10VRMS AV = 0dB, RL = 10kΩ
LME49720 300038n6.gif
Figure 53. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 10VRMS AV = 0dB, RL = 10kΩ
LME49720 300038n3.gif
Figure 55. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 10VRMS AV = 0dB, RL = 10kΩ
LME49720 300038p2.gif
Figure 57. PSRR+ vs Frequency VCC = 15V, VEE = –15V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p3.gif
Figure 59. PSRR+ vs Frequency VCC = 15V, VEE = –15V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p1.gif
Figure 61. PSRR+ vs Frequency VCC = 15V, VEE = –15V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p8.gif
Figure 63. PSRR+ vs Frequency VCC = 12V, VEE = –12V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p9.gif
Figure 65. PSRR+ vs Frequency VCC = 12V, VEE = –12V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p7.gif
Figure 67. PSRR+ vs Frequency VCC = 12V, VEE = –12V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038r0.gif
Figure 69. PSRR+ vs Frequency VCC = 17V, VEE = –17V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038r1.gif
Figure 71. PSRR+ vs Frequency VCC = 17V, VEE = –17V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q9.gif
Figure 73. PSRR+ vs Frequency VCC = 17V, VEE = –17V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q4.gif
Figure 75. PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q5.gif
Figure 77. PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q3.gif
Figure 79. PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038g0.gif
Figure 81. Cmrr vs Frequency VCC = 15V, VEE = –15V RL = 2kΩ
LME49720 300038g3.gif
Figure 83. Cmrr vs Frequency VCC = 17V, VEE = –17V RL = 2kΩ
LME49720 300038o9.gif
Figure 85. Cmrr vs Frequency VCC = 15V, VEE = –15V RL = 600Ω
LME49720 300038g5.gif
Figure 87. Cmrr vs Frequency VCC = 17V, VEE = –17V RL = 600Ω
LME49720 300038o8.gif
Figure 89. Cmrr vs Frequency VCC = 15V, VEE = –15V RL = 10kΩ
LME49720 300038g4.gif
Figure 91. Cmrr vs Frequency VCC = 17V, VEE = –17V RL = 10kΩ
LME49720 300038h1.gif
Figure 93. Output Voltage vs Load Resistance VDD = 15V, VEE = –15v Thd+N = 1%
LME49720 300038h2.gif
Figure 95. Output Voltage vs Load Resistance VDD = 17V, VEE = –17v Thd+N = 1%
LME49720 300038j9.gif
Figure 97. Output Voltage vs Supply Voltage RL = 2kΩ, Thd+N = 1%
LME49720 300038k0.gif
Figure 99. Output Voltage vs Supply Voltage RL = 10kΩ, Thd+N = 1%
LME49720 300038j5.gif
Figure 101. Supply Current vs Supply Voltage RL = 600Ω
LME49720 300038j0.gif
Figure 103. Full Power Bandwidth vs Frequency
LME49720 300038i7.gif
Figure 105. Small-Signal Transient Response AV = 1, CL = 10pf
LME49720 30003828.png
Figure 107. RIAA Preamp Voltage Gain,
RIAA Deviation vs Frequency
LME49720 300038k7.gif
Figure 2. Thd+N vs Output Voltage VCC = 12V, VEE = –12v RL = 2kΩ
LME49720 300038i4.gif
Figure 4. Thd+N vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 2kΩ
LME49720 300038l0.gif
Figure 6. Thd+N vs Output Voltage VCC = 12V, VEE = –12V RL = 600Ω
LME49720 300038i6.gif
Figure 8. Thd+N vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 600Ω
LME49720 300038l3.gif
Figure 10. Thd+N vs Output Voltage VCC = 12V, VEE = –12V RL = 10kΩ
LME49720 300038i5.gif
Figure 12. Thd+N vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 10kΩ
LME49720 30003862.gif
Figure 14. Thd+N vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS RL = 2kΩ
LME49720 30003859.gif
Figure 16. Thd+N vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS RL = 600Ω
LME49720 30003860.gif
Figure 18. Thd+N vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS RL = 600Ω
LME49720 30003866.gif
Figure 20. Thd+N vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS RL = 10kΩ
LME49720 300038e6.gif
Figure 22. IMD vs Output Voltage VCC = 15V, VEE = –15V RL = 2kΩ
LME49720 300038e4.gif
Figure 24. IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V RL = 2kΩ
LME49720 300038e2.gif
Figure 26. IMD vs Output Voltage VCC = 15V, VEE = –15V RL = 600Ω
LME49720 300038e3.gif
Figure 28. IMD vs Output Voltage VCC = 17V, VEE = –17V RL = 600Ω
LME49720 300038f1.gif
Figure 30. IMD vs Output Voltage VCC = 15V, VEE = –15V RL = 10kΩ
LME49720 300038f2.gif
Figure 32. IMD vs Output Voltage VCC = 17V, VEE = –17V RL = 10kΩ
LME49720 300038h6.gif
Figure 34. Voltage Noise Density vs Frequency
LME49720 300038c8.gif
Figure 36. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS AV = 0dB, RL = 2kΩ
LME49720 300038c6.gif
Figure 38. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS AV = 0dB, RL = 2kΩ
LME49720 300038d0.gif
Figure 40. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS AV = 0dB, RL = 2kΩ
LME49720 300038n8.gif
Figure 42. Crosstalk vs Frequency VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS AV = 0dB, RL = 2kΩ
LME49720 300038d7.gif
Figure 44. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 10VRMS AV = 0dB, RL = 600Ω
LME49720 300038d5.gif
Figure 46. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 10VRMS AV = 0dB, RL = 600Ω
LME49720 300038d9.gif
Figure 48. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 10VRMS AV = 0dB, RL = 600Ω
LME49720 300038o0.gif
Figure 50. Crosstalk vs Frequency VCC = 15V, VEE = –15V, VOUT = 3VRMS AV = 0dB, RL = 10kΩ
LME49720 300038n9.gif
Figure 52. Crosstalk vs Frequency VCC = 12V, VEE = –12V, VOUT = 3VRMS AV = 0dB, RL = 10kΩ
LME49720 300038n5.gif
Figure 54. Crosstalk vs Frequency VCC = 17V, VEE = –17V, VOUT = 3VRMS AV = 0dB, RL = 10kΩ
LME49720 300038n4.gif
Figure 56. Crosstalk vs Frequency VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS AV = 0dB, RL = 10kΩ
LME49720 300038p5.gif
Figure 58. PSRR- vs Frequency VCC = 15V, VEE = –15V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p6.gif
Figure 60. PSRR- vs Frequency VCC = 15V, VEE = –15V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038p4.gif
Figure 62. PSRR- vs Frequency VCC = 15V, VEE = –15V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q1.gif
Figure 64. PSRR– vs Frequency VCC = 12V, VEE = –12V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q2.gif
Figure 66. PSRR– vs Frequency VCC = 12V, VEE = –12V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q0.gif
Figure 68. PSRR– vs Frequency VCC = 12V, VEE = –12V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038r3.gif
Figure 70. PSRR– vs Frequency VCC = 17V, VEE = –17V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038r4.gif
Figure 72. PSRR– vs Frequency VCC = 17V, VEE = –17V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038r2.gif
Figure 74. PSRR– vs Frequency VCC = 17V, VEE = –17V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q7.gif
Figure 76. PSRR– vs Frequency VCC = 2.5V, VEE = –2.5V RL = 10kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q8.gif
Figure 78. PSRR– vs Frequency VCC = 2.5V, VEE = –2.5V RL = 2kΩ, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038q6.gif
Figure 80. PSRR– vs Frequency VCC = 2.5V, VEE = –2.5V RL = 600Ω, F = 200kHz, VRIPPLE = 200mvpp
LME49720 300038f7.gif
Figure 82. Cmrr vs Frequency VCC = 12V, VEE = –12V RL = 2kΩ
LME49720 300038f4.gif
Figure 84. Cmrr vs Frequency VCC = 2.5V, VEE = –2.5V RL = 2kΩ
LME49720 300038f9.gif
Figure 86. Cmrr vs Frequency VCC = 12V, VEE = –12V RL = 600Ω
LME49720 300038f6.gif
Figure 88. Cmrr vs Frequency VCC = 2.5V, VEE = –2.5V RL = 600Ω
LME49720 300038f8.gif
Figure 90. Cmrr vs Frequency VCC = 12V, VEE = –12V RL = 10kΩ
LME49720 300038f5.gif
Figure 92. Cmrr vs Frequency VCC = 2.5V, VEE = –2.5V RL = 10kΩ
LME49720 300038h0.gif
Figure 94. Output Voltage vs Load Resistance VDD = 12V, VEE = –12v Thd+N = 1%
LME49720 300038g9.gif
Figure 96. Output Voltage vs Load Resistance VDD = 2.5V, VEE = –2.5v Thd+N = 1%
LME49720 300038j8.gif
Figure 98. Output Voltage vs Supply Voltage RL = 600Ω, Thd+N = 1%
LME49720 300038j6.gif
Figure 100. Supply Current vs Supply Voltage RL = 2kΩ
LME49720 300038j7.gif
Figure 102. Supply Current vs Supply Voltage RL = 10kΩ
LME49720 300038j1.gif
Figure 104. Gain Phase vs Frequency
LME49720 300038i8.gif
Figure 106. Small-Signal Transient Response AV = 1, CL = 100pf
LME49720 30003829.png
Figure 108. Flat Amp Voltage Gain vs Frequency

8 Parameter Measurement Information

All parameters are measured according to the conditions described in the Specifications section.

8.1 Distortion Measurements

The vanishingly low residual distortion produced by LME49720 is below the capabilities of all commercially available equipment. This makes distortion measurements just slightly more difficult than simply connecting a distortion meter to the amplifier’s inputs and outputs. The solution, however, is quite simple: an additional resistor. Adding this resistor extends the resolution of the distortion measurement equipment.

The LME49720’s low residual distortion is an input referred internal error. As shown in Figure 109, adding the 10Ω resistor connected between the amplifier’s inverting and non-inverting inputs changes the amplifier’s noise gain. The result is that the error signal (distortion) is amplified by a factor of 101. Although the amplifier’s closed-loop gain is unaltered, the feedback available to correct distortion errors is reduced by 101, which means that measurement resolution increases by 101. To ensure minimum effects on distortion measurements, keep the value of R1 low as shown in Figure 109.

This technique is verified by duplicating the measurements with high closed loop gain and/or making the measurements at high frequencies. Doing so produces distortion components that are within the measurement equipment’s capabilities. This datasheet’s THD+N and IMD values were generated using the above described circuit connected to an Audio Precision System Two Cascade.

LME49720 300038k4.gif Figure 109. THD+N and IMD Distortion Test Circuit
LME49720 30003827.gif
Complete shielding is required to prevent induced pick up from external sources. Always check with oscilloscope for power line noise.

Total Gain: 115 dB @F = 1 kHz
Input Referred Noise Voltage: En = V0/560,000 (V)
Figure 110. Noise Measurement Circuit

9 Detailed Description

9.1 Overview

The LME49720 audio operational amplifier delivers superior audio signal amplification for outstanding audio performance.

To ensure that the most challenging loads are driven without compromise, the LME49720 has a high slew rate of ±20V/μs and an output current capability of ±26mA. Further, dynamic range is maximized by an output stage that drives 2kΩ loads to within 1V of either power supply voltage and to within 1.4V when driving 600Ω loads.

The LME49720's outstanding CMRR (120dB), PSRR (120dB), and VOS (0.1mV) give the amplifier excellent operational amplifier DC performance.

The LME49720 has a wide supply range of ±2.5V to ±17V. Over this supply range the LME49720’s input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49720 is unity gain stable. This Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF.

The LME49720 is available in 8–lead narrow body SOIC, 8–lead PDIP, and 8–lead TO-99. Demonstration boards are available for each package.

9.2 Functional Block Diagram

LME49720 30003855.gif

9.3 Feature Description

9.3.1 Capacitive Load

The LME49720 is a high speed op amp with excellent phase margin and stability. Capacitive loads up to 100pF will cause little change in the phase characteristics of the amplifiers and are therefore allowable.

Capacitive loads greater than 100pF must be isolated from the output. The most straightforward way to do this is to put a resistor in series with the output. This resistor will also prevent excess power dissipation if the output is accidentally shorted.

9.3.2 Balance Cable Driver

With high peak-to-peak differential output voltage and plenty of low distortion drive current, the LME49720 makes an excellent balanced cable driver. Combining the single-to-differential configuration with a balanced cable driver results in a high performance single-ended input to balanced line driver solution.

Although the LME49720 can drive capacitive loads up to 100pF, cable loads exceeding 100pF can cause instability. For such applications, series resistors are needed on the outputs before the capacitive load.

9.4 Device Functional Modes

This device does not have operation mode.

 
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