BurrBrown Products

from Texas Instruments

FEATURES

DESCRIPTION

APPLICATIONS

Switching

Stage

Sampling

Comparator (SC)

OPA615

Biasing

OTA

Hold

Control

Emitter

2

Collector

(I

12

1

S/H

In+

S/H

In

−

∞

+V

CC

−V

CC

I

SOTA

Base

C

HOLD

Ground

3

4

9

7

10

11

13

5

OPA615

SBOS299B – FEBRUARY 2004 – REVISED JULY 2005

Wide-Bandwidth, DC Restoration Circuit

•

PROPAGATION DELAY: 1.9ns

The OPA615 is a complete subsystem for very fast

and precise DC restoration, offset clamping, and

•

BANDWIDTH:

low-frequency hum suppression of wideband ampli-

OTA: 710MHz

fiers or buffers. Although it is designed to stabilize the

Comparator: 730MHz

performance of video signals, the circuit can also be

•

LOW INPUT BIAS CURRENT:

±1µA

used as a sample-and-hold amplifier, high-speed

•

SAMPLE-AND-HOLD SWITCHING

integrator, or peak detector for nanosecond pulses.

TRANSIENTS:

±5mV

The

device

features

a

wideband

Operational

Transconductance

Amplifier

(OTA)

with

a

•

SAMPLE-AND-HOLD FEEDTHROUGH

high-impedance cascode current source output and

REJECTION: 100dB

fast and precise sampling comparator that together

•

CHARGE INJECTION: 40fC

set a new standard for high-speed applications. Both

•

HOLD COMMAND DELAY TIME: 2.5ns

the OTA and the sampling comparator can be used

as stand-alone circuits or combined to form a more

•

TTL/CMOS HOLD CONTROL

complex signal processing stage. The self-biased,

bipolar OTA can be viewed as an ideal volt-

age-controlled current source and is optimized for low

•

BROADCAST/HDTV EQUIPMENT

input bias current. The sampling comparator has two

•

TELECOMMUNICATIONS EQUIPMENT

identical high-impedance inputs and a current source

output optimized for low output bias current and offset

•

HIGH-SPEED DATA ACQUISITION

voltage; it can be controlled by a TTL-compatible

•

CAD MONITORS/CCD IMAGE PROCESSING

switching stage within a few nanoseconds. The

•

NANOSECOND PULSE INTEGRATOR/PEAK

transconductance

of

the

OTA

and

sampling

DETECTOR

comparator can be adjusted by an external resistor,

•

PULSE CODE MODULATOR/DEMODULATOR

allowing bandwidth, quiescent current, and gain

•

COMPLETE VIDEO DC LEVEL RESTORATION

trade-offs to be optimized.

•

SAMPLE-AND-HOLD AMPLIFIER

The OPA615 is available in both an SO-14 sur-

•

SHC615 UPGRADE

face-mount and an MSOP-10 package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.