®
SHC
6
15
SHC615
SHC
615
Wide-Bandwidth,
DC RESTORATION CIRCUIT
FEATURES
q
PROPAGATION DELAY: 2.2ns
q
BANDWIDTH: OTA: 750MHz
Comparator: 280MHz
q
LOW INPUT BIAS CURRENT: –0.3µA
q
SAMPLE/HOLD
SWITCHING TRANSIENTS: +1/–7mV
q
SAMPLE/HOLD
FEEDTHROUGH REJECTION: 100dB
q
CHARGE INJECTION: 40fC
q
HOLD COMMAND DELAY TIME: 3.8ns
q
TTL/CMOS HOLD CONTROL
APPLICATIONS
q
BROADCAST/HDTV EQUIPMENT
q
TELECOMMUNICATIONS EQUIPMENT
q
HIGH-SPEED DATA ACQUISITION
q
CAD MONITORS/CCD IMAGE
PROCESSING
q
NANO SECOND PULSE INTEGRATOR/
PEAK DETECTORS
q
PULSE CODE MODULATOR/
DEMODULATOR
q
COMPLETE VIDEO DC LEVEL
RESTORATION
q
SAMPLE/HOLD AMPLIFIER
DESCRIPTION
The SHC615 is a complete subsystem for very fast
and precise DC restoration, offset clamping, and low
frequency hum suppression of wideband amplifiers or
buffers. Designed to stabilize the performance of
video signals, it can also be used as a sample/hold
amplifier, high-speed integrator, or peak detector for
nanosecond pulses. A wideband Operational
Transconductance Amplifier (OTA) with a high-im-
pedance cascode current source output and fast sam-
pling comparator set a new standard for high-speed
applications. Both can be used as stand-alone circuits
or combined to form a more complex signal process-
ing stage. The self-biased, bipolar OTA can be viewed
as an ideal voltage-controlled current source and is
Ground
9
C
HOLD
4
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 tradeoffs to be optimized.
The SHC615 is available in SO-14 surface mount and
14-pin plastic DIPs, and is specified over the ex-
tended temperature range of –40°C to +85°C.
Base
3
2
Emitter
Hold Control
7
Switching
Stage
Sampling
Comparator (SC)
SOTA
∞
SHC615
13
+V
CC
OTA
12
Collector (I
OUT
)
I
Q
Adjust
S/H 10
In+
S/H 11
In–
Biasing
1
5
–V
CC
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1994 Burr-Brown Corporation
PDS-1214C
Printed in the U.S.A. May, 1995
BURR-BROWN [ BURR-BROWN CORPORATION ]
