Wide Bandwidth, DC Restoration Circuit - OPA615

OPA615 (ACTIVE)

Wide Bandwidth, DC Restoration Circuit

 

Description

The OPA615 is a complete subsystem for very fast and precise DC restoration, offset clamping, and low-frequency hum suppression of wideband amplifiers or buffers. Although it is designed to stabilize the performance of video signals, the circuit can also be used as a sample-and-hold amplifier, high-speed integrator, or peak detector for nanosecond pulses. The device features a wideband Operational Transconductance Amplifier (OTA) with a high-impedance cascode current source output and fast and precise sampling comparator that together set a new standard for high-speed applications. Both the OTA and the sampling comparator can be used as stand-alone circuits or combined to form a more complex signal processing stage. The self-biased, bipolar OTA can be viewed as an ideal voltage-controlled current source and is optimized for low input bias current. The sampling comparator has two identical high-impedance inputs and a current source output optimized for low output bias current and offset voltage; it can be controlled by a TTL-compatible switching stage within a few nanoseconds. The transconductance of the OTA and sampling comparator can be adjusted by an external resistor, allowing bandwidth, quiescent current, and gain trade-offs to be optimized.

The OPA615 is available in both an SO-14 surface-mount and an MSOP-10 package.

Features

  • PROPAGATION DELAY: 1.9ns
  • BANDWIDTH:
    OTA: 710MHz
    Comparator: 730MHz
  • LOW INPUT BIAS CURRENT: ±1µA
  • SAMPLE-AND-HOLD SWITCHING TRANSIENTS: ±5mV
  • SAMPLE-AND-HOLD FEEDTHROUGH REJECTION: 100dB
  • CHARGE INJECTION: 40fC
  • HOLD COMMAND DELAY TIME: 2.5ns
  • TTL/CMOS HOLD CONTROL
  • APPLICATIONS
    • BROADCAST/HDTV EQUIPMENT
    • TELECOMMUNICATIONS EQUIPMENT
    • HIGH-SPEED DATA ACQUISITION
    • CAD MONITORS/CCD IMAGE PROCESSING
    • NANOSECOND PULSE INTEGRATOR/PEAK DETECTOR
    • PULSE CODE MODULATOR/DEMODULATOR
    • COMPLETE VIDEO DC LEVEL RESTORATION
    • SAMPLE-AND-HOLD AMPLIFIER
    • SHC615 UPGRADE

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Parametrics Compare all products in Transconductance Amplifiers

 
Iq per channel (Max) (mA)
Slew Rate (Typ) (V/us)
GBW (Typ) (MHz)
Output Current (Typ) (mA)
Vs (Min) (V)
Vs (Max) (V)
Number of Channels (#)
Acl, min spec gain (V/V)
BW @ Acl (MHz)
Vos (Max) (mV)
Vn at Flatband (Typ) (nV/rtHz)
IIB (Max) (nA)
Available Channels
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
OPA615
13   
2500   
710   
20   
8   
12.4   
1   
1   
710   
40   
4.6   
3000   
S   
-40 to 85   
SOIC
VSSOP   
14SOIC: 52 mm2: 6 x 8.65(SOIC)
10VSSOP: 15 mm2: 4.9 x 3(VSSOP)   

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