JAJSVI4
October 2024
ADS127L21B
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Timing Requirements (1.65V ≤ IOVDD ≤ 2V)
5.7
Switching Characteristics (1.65V ≤ IOVDD ≤ 2V)
5.8
Timing Requirements (2V < IOVDD ≤ 5.5V)
5.9
Switching Characteristics (2V < IOVDD ≤ 5.5V)
5.10
Timing Diagrams
5.11
Typical Characteristics
6
Parameter Measurement Information
6.1
Offset Error Measurement
6.2
Offset Drift Measurement
6.3
Gain Error Measurement
6.4
Gain Drift Measurement
6.5
NMRR Measurement
6.6
CMRR Measurement
6.7
PSRR Measurement
6.8
SNR Measurement
6.9
INL Error Measurement
6.10
THD Measurement
6.11
IMD Measurement
6.12
SFDR Measurement
6.13
Noise Performance
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Analog Input (AINP, AINN)
7.3.1.1
Input Range
7.3.2
Reference Voltage (REFP, REFN)
7.3.2.1
Reference Voltage Range
7.3.3
Clock Operation
7.3.3.1
Internal Oscillator
7.3.3.2
External Clock
7.3.4
Modulator
7.3.5
Digital Filter
7.3.5.1
Wideband Filter
7.3.5.1.1
Wideband Filter Options
7.3.5.1.2
Sinc5 Filter Stage
7.3.5.1.3
FIR1 Filter Stage
7.3.5.1.4
FIR2 Filter Stage
7.3.5.1.5
FIR3 Filter Stage
7.3.5.1.6
FIR3 Default Coefficients
7.3.5.1.7
IIR Filter Stage
7.3.5.1.7.1
IIR Filter Stability
7.3.5.2
Low-Latency Filter (Sinc)
7.3.5.2.1
Sinc3 and Sinc4 Filters
7.3.5.2.2
Sinc3 + Sinc1 and Sinc4 + Sinc1 Cascade Filter
7.3.6
Power Supplies
7.3.6.1
AVDD1 and AVSS
7.3.6.2
AVDD2
7.3.6.3
IOVDD
7.3.6.4
Power-On Reset (POR)
7.3.6.5
CAPA and CAPD
7.3.7
VCM Output Voltage
7.4
Device Functional Modes
7.4.1
Speed Modes
7.4.2
Idle Mode
7.4.3
Standby Mode
7.4.4
Power-Down Mode
7.4.5
Reset
7.4.5.1
RESET Pin
7.4.5.2
Reset by SPI Register Write
7.4.5.3
Reset by SPI Input Pattern
7.4.6
Synchronization
7.4.6.1
Synchronized Control Mode
7.4.6.2
Start/Stop Control Mode
7.4.6.3
One-Shot Control Mode
7.4.7
Conversion-Start Delay Time
7.4.8
Calibration
7.4.8.1
OFFSET2, OFFSET1, OFFSET0 Calibration Registers (Addresses 0Ch, 0Dh, 0Eh)
7.4.8.2
GAIN2, GAIN1, GAIN0 Calibration Registers (Addresses 0Fh, 10h, 11h)
7.4.8.3
Calibration Procedure
7.5
Programming
7.5.1
Serial Interface (SPI)
7.5.1.1
Chip Select (CS)
7.5.1.2
Serial Clock (SCLK)
7.5.1.3
Serial Data Input (SDI)
7.5.1.4
Serial Data Output/Data Ready (SDO/DRDY)
7.5.1.5
SPI Frame
7.5.1.6
Full-Duplex Operation
7.5.1.7
Device Commands
7.5.1.7.1
No-Operation
7.5.1.7.2
Read Register Command
7.5.1.7.3
Write Register Command
7.5.1.8
Read Conversion Data
7.5.1.8.1
Conversion Data
7.5.1.8.2
Data Ready
7.5.1.8.2.1
DRDY
7.5.1.8.2.2
SDO/DRDY
7.5.1.8.2.3
DRDY Bit
7.5.1.8.2.4
Clock Counting
7.5.1.8.3
STATUS Byte
7.5.1.9
Daisy-Chain Operation
7.5.1.10
3-Wire SPI Mode
7.5.1.10.1
3-Wire SPI Mode Frame Reset
7.5.1.11
SPI CRC
7.5.2
Register Memory CRC
7.5.2.1
Main Program Memory CRC
7.5.2.2
FIR Filter Coefficient CRC
7.5.2.3
IIR Filter Coefficient CRC
8
Register Map
9
Application and Implementation
9.1
Application Information
9.1.1
SPI Operation
9.1.2
Input Driver
9.1.3
Antialias Filter
9.1.4
Reference Voltage
9.1.5
Simultaneous-Sampling Systems
9.2
Typical Applications
9.2.1
A-Weighting Filter Design
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.3
Application Curve
9.2.2
PGA855 Programmable Gain Amplifier
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
9.2.3
THS4551 Antialias Filter Design
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.3.3
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.2
Layout Example
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Related Documentation
10.2
ドキュメントの更新通知を受け取る方法
10.3
サポート・リソース
10.4
Trademarks
10.5
静電気放電に関する注意事項
10.6
用語集
11
Revision History
12
Mechanical, Packaging, and Orderable Information
1
特長
AC 性能と DC 精度を両立:
ダイナミックレンジ (200kSPS):111.5dB (標準値)
INL:FSR の 0.2ppm (標準値)
THD:-125dB (標準値)
オフセット ドリフト:50nV/°C (標準値)
ゲイン ドリフト:0.5ppm/°C (標準値)
電力スケーラブルな速度モード:
最高速度:512kSPS、33mW (標準値)
高速度:400kSPS、26mW (標準値)
中速度:200kSPS、14mW (標準値)
低速度:50kSPS、4.3mW (標準値)
広帯域または低レイテンシのフィルタ オプション
データ レートをプログラム可能:
広帯域フィルタモード:512kSPS
低レイテンシ フィルタモード:1.365MSPS
プログラム可能な IIR および FIR デジタル フィルタ
バッファ付き入力
1.5µA 入力電流 (標準値)、中速度モード
入力範囲:±V
REF
または ±2V
REF
内部または外部クロック動作
変換レイテンシ (低レイテンシ フィルタ):3µs
機能安全対応
機能安全システムの設計に役立つ資料を利用可能