SLOSEB7C September   2024  – September 2025 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

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 or to source on Log_Inp and Log_Inm (unless otherwise noted)(1)(2)
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
TA = –40°C to +125°C ±2.5
DR Dynamic range(3) LCE = ±1dB, f = 1MHz, VCC = 5V 96 98 dB
Log-Detector slope(4)  RF value in kΩ(5) mV/dB
Log-Detector slope variation(3) Ref_Res = 56kΩ, 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(3)(6)
Log_Inp = 10nF to AGND		 QFN Package 82 142 233 mV
TA = –40°C to +125°C 301
SOIC Package 90 130 162
TA = –40°C to +125°C 250 mV
Maximum output voltage  TA = –40°C to +125°C VCC– 0.3 V
BUFFER OUTPUT (CLOAD || RLOAD = 100pF || 10kΩ)
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 time(5) CLOAD || RLOAD = 100pF || 10kΩ  1.5 µs
Short-circuit current Source-and-sink current 10 mA
ZOUT Output impedance 5.3 Ω
INV_BUFFER OUTPUT (CLOAD || RLOAD = 100pF || 10kΩ)
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 time(5) CLOAD || RLOAD = 100pF || 10kΩ   1.5 µs
Output-referred offset 32 mV
Short-circuit current Source-and-sink current 10 mA
Output impedance 6.3 Ω
FREQUENCY DETECT OUTPUT
Frequency detect block typical input sensitivity Log_Inp signal of f < 20MHz 250µ 1.6 VP
Frequency error Averaged over 1ms, TA = –40°C to +125°C 0.15 %
Freq_Out swing DGND Freq_Supply V
POWER SUPPLY
Quiescent current  Current through VCC  3.6 4.6 mA
TA = –40°C to +125°C 5.9
Current through Freq_Supply 0.37
(1) See Offset Correction Loop to calculate the value of capacitor on Offset_Cap pin based on signal frequency.
(2) The symbol f stands for a short burst of sine wave applied at the Log_Inp pin. This definition applies across the data sheet.
(3) Characterized through 32 units.
(4) Log-Detector slope reduces with increased input signal frequency, see Typical Characteristics.
(5) See Parameter Measurement Information for definition of RF.
(6) Minimum output voltage is the lowest voltage that Log_Out settles to when the inputs are shorted to the AGND pin using a high-value capacitor with no signal applied.