SLOSEB7A September   2024  – October 2024 LOG300

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics Low Noise Amplifier (LNA) 
    6. 5.6 Electrical Characteristics Log Detector
    7. 5.7 Electrical Characteristics LNA + Log Detector (AFE)
    8. 5.8 Typical Characteristics: VCC = 5V
    9. 5.9 Typical Characteristics: VCC = 3.3V
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Offset Correction Loop (OCL)
      2. 7.3.2 Single and Differential Input
      3. 7.3.3 Input Frequency Detect
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Ultrasonic Distance Measurement
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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発注情報

5.6 Electrical Characteristics Log Detector

at TA = 25°C, VCC = 3.3V to 5V, CF = 1nF, RF = 43kΩ (slope = 43mV/dB) for VCC = 5V and RF = 30kΩ for VCC = 3.3V, Ref_resistor = 1% 56kΩ, 10nF capacitor to AGND on Log_inp and Log_inm (unless otherwise noted)(4)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
AC PERFORMANCE
LCE Log conformance error(3) f = 1MHz ±0.6 ±1 dB
TA = –40°C to +125°C ±1.1
f = 40MHz  ±2 ±2.5
TA = –40°C to +125°C ±2.9
DR Dynamic range(3) LCE = ±1dB, f = 1MHz 96 98 dB
Log Detector slope(1)  RF value in kΩ(2) mV/dB
Log Detector slope variation(3) Ref_Res = 56kΩ of 1% accuracy, f = 1MHz ±1 ±6 %
TA = –40°C to +125°C ±6.8
Ref_Res = open, f = 1MHz ±4.5
TA = –40°C to +125°C ±5.6
INPUT
VLog_In Typical input voltage VCC = 3.3V, LCE = ±2dB,
f = 20MHz		 20µ 1.2 VP
TA = –40°C to +85°C 24µ 1
TA = –40°C to +125°C 26µ 0.8
VCC = 5V, LCE = ±2dB,
f = 20MHz		 20µ 1.6
TA = –40°C to +85°C 22µ 1.6
TA = –40°C to +125°C 32µ 1.6
Differential input voltage (Log_Inp) – (Log_Inm ), TA = –40°C to +125°C ±1.6 V
Internal bias voltage Log_Inp and Log_Inm 1.7 V
Input impedance for Log_Inp and Log_Inm 1.7 || 10 kΩ || pF
LOG_OUT
Log_Out rise time CF = 220pF 20 µs
CF = 1nF  95
Log_Out fall time CF = 220pF 27 µs
CF = 1nF  100
Output overdrive recovery  CF = 220pF  250 μs
Minimum output voltage(5)(3) Log_Inp = 10nF to AGND 83 155 205 mV
TA = –40°C to +125°C 340
Maximum output voltage  TA = –40°C to +125°C VCC– 0.3 V
BUFFER OUTPUT
Gain VBuffer/VLog_Out +2 V/V
Output voltage equation 2 × Log_Out V
Output-referred offset 30 mV
Output voltage TA = –40°C to +125°C GND + 0.1 VCC– 0.1 V
Rise-and-fall response time(2) CLoad || RLoad = 100pF || 10kΩ  1.5 µs
Short-circuit current Source-and-sink current 20 mA
ZOUT Output impedance 5.3 Ω
INV_BUFFER OUTPUT
Gain VInv_Buffer/VLog_Out  –2 V/V
Output voltage equation VCC  – (2 × Log_Out) V
Output voltage TA = –40°C to +125°C GND + 0.1 VCC – 0.1 V
Rise-and-fall response time(2) CLoad || RLoad = 100pF || 10kΩ   1.5 µs
Output-referred offset 32 mV
Short-circuit current Source-and-sink current 20 mA
Output impedance 6.3 Ω
FREQUENCY DETECT OUTPUT
Frequency detect block typical input sensitivity Log_Inp signal of f < 2MHz 250µ 1.6 VP
Log_Inp signal of f < 20MHz 1.7m 1.6
Freq_Out swing DGND Freq_Supply V
POWER SUPPLY
Quiescent current  Freq_Supply = Open 4.1 4.6 mA
TA = –40°C to +125°C 5.9
Freq_Supply = VCC 0.37
(1) Log Detector slope reduces with increased input signal frequency, refer to Typical Characteristics
(2) Refer to Parameter Measurement Information for definition of RF
(3) Charecterized through 32 units
(4) The symbol f stands for a short burst of sinewave of a frequency, f, applied at the Log_Inp pin. This definition holds through across the data sheet.
(5) Minimum output voltage is the lowest voltage Log_Out settles to, when inputs are shorted to AGND pin via a high value capacitor with no signal being applied.