SBOS275G June   2003  – December 2015 VCA810

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  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 High Grade DC Characteristics: VS = ±5 V (VCA810AID)
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input and Output Range
      2. 8.3.2 Overdrive Recovery
      3. 8.3.3 Output Offset Error
      4. 8.3.4 Offset Adjustment
      5. 8.3.5 Gain Control
      6. 8.3.6 Gain Control and Teeple Point
      7. 8.3.7 Noise Performance
      8. 8.3.8 Input and ESD Protection
    4. 8.4 Device Functional Modes
  9. 9 Applications and Implementation
    1. 9.1 Application Information
      1. 9.1.1 VCA810 Operation
      2. 9.1.2 Range-Finding TGC Amplifier
      3. 9.1.3 Wide-Range AGC Amplifier
      4. 9.1.4 Stabilized Wein-Bridge Oscillator
      5. 9.1.5 Low-Drift Wideband Log Amplifier
      6. 9.1.6 Voltage-Controlled Low-Pass Filter
      7. 9.1.7 Tunable Equalizer
      8. 9.1.8 Voltage-Controlled Band-Pass filter
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
      1. 11.2.1 Thermal Analysis
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 Demonstration Boards
        2. 12.1.1.2 Macromodels and Applications Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • High Gain Adjust Range: ±40 dB
  • Differential In, Single-Ended Out
  • Low Input Noise Voltage: 2.4 nV/√Hz
  • Constant Bandwidth vs Gain: 35 MHz
  • High dB/V Gain Linearity: ±0.3 dB
  • Gain Control Bandwidth: 25 MHz
  • Low Output DC Error: < ±40 mV
  • High Output Current: ±60 mA
  • Low Supply Current: 24.8 mA
    (Maximum for –40°C to 85°C Temperature Range)

2 Applications

  • Optical Receiver Time Gain Control
  • Sonar Systems
  • Voltage-Tunable Active Filters
  • Log Amplifiers
  • Pulse Amplitude Compensation
  • AGC receivers With RSSI
  • Improved Replacement for VCA610

3 Description

The VCA810 is a DC-coupled, wideband, continuously variable, voltage-controlled gain amplifier. The device provides a differential input to single-ended output conversion with a high-impedance gain control input used to vary the gain over a –40-dB to 40-dB range linear in dB/V.

Operating from ±5-V supplies, the device gain control voltage adjusts the gain from –40 dB at a 0-V input to 40 dB at a –2-V input. Increasing the control voltage above ground attenuates the signal path to greater than 80 dB. Signal bandwidth and slew rate remain constant over the entire gain adjust range. This 40-dB/V gain control is accurate within ±1.5 dB (±0.9 dB for high grade), allowing the gain control voltage in an AGC application to be used as a received signal strength indicator (RSSI) with ±1.5-dB accuracy.

Excellent common-mode rejection and common-mode input range at the two high-impedance inputs allow the device to provide a differential receiver operation with gain adjust. The output signal is referenced to ground. Zero differential input voltage gives a 0-V output with a small DC offset error. Low input noise voltage ensures good output SNR at the highest gain settings.

In applications where pulse edge information is critical, and the device is being used to equalize varying channel loss, minimal change in group delay over gain setting retains excellent pulse edge information.

An improved output stage provides adequate output current to drive the most demanding loads. Although principally intended to drive analog-to-digital converters (ADCs) or second-stage amplifiers, the ±60-mA output current easily drives doubly-terminated 50-Ω lines or a passive post-filter stage over the ±1.7-V output voltage range.

Device Information

PART NUMBER PACKAGE BODY SIZE (NOM)
VCA810 SOIC (8) 4.90 mm × 3.91 mm

Functional Block Diagram

VCA810 fbd_bos275.gif