1FEATURES

2• 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

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.