®
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
DC SPECIFICATIONS
At V
CC
=
±5V,
R
LOAD
= 100Ω, R
Q
= 300Ω, R
IN
= 150Ω and T
A
= +25°C, unless otherwise specified.
SHC615AP, AU
PARAMETER
OTA
OFFSET VOLTAGE, V
E
at V
B
= 0
Initial
vs Temperature
vs Supply (tracking)
B-INPUT BIAS CURRENT
Initial
vs Temperature
C-OUTPUT BIAS CURRENT, I
C
at V
B
= 0
Initial
B-INPUT IMPEDANCE
INPUT NOISE
Voltage Noise Density, B-to-E
Voltage Noise Density, B-to-C
INPUT VOLTAGE RANGE
OUTPUT
Output Voltage Compliance
C-Current Output
E-Current Output
C-Output Impedance
E-Output Impedance
Open-Loop Gain
TRANSCONDUCTANCE
Small Signal, <200mV
f
OUT
= 100kHz to 100MHz
f
OUT
= 100kHz to 100MHz
–200
8
40
55
–0.3
1
–77
4.4
2.2
4.5
±3.4
±3.2
±20
±20
0.5
12
96
70
±40
mV
µV/°C
dB
µA
nA/°C
µA
MΩ
nV/√Hz
nV/√Hz
V
V
mA
mA
MΩ
Ω
dB
mA/V
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
=
±4.5V
to
±5.5V
50
±0.9
+100
±18
±18
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are
subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN
does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
SHC615
2
PIN CONFIGURATION
Top View
DIP, SO-14
BLOCK DIAGRAM
Ground
9
C
HOLD
4
Base
3
2
Hold
Control
7
Switching
Stage
Sampling
Comparator (SC)
SOTA
∞
SHC615
13
+V
CC
5
–V
CC
OTA
12 Collector
(I
OUT
)
1
I
Q
Adjust
Emitter
I
Q
Adjust
Emitter, E
Base, B
C
HOLD
–V
CC
NC
Hold Control
1
2
3
•
SHC615
14 NC
13 +V
CC
12 I
OUT
, Collector, C
11 S/H In–
10 S/H In+
9
8
Ground
NC
S/H 10
In+
S/H 11
In–
4
5
6
7
Biasing
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (±V
CC
) ..............................................................
±6V
Input Voltage
(1)
........................................................................
±V
CC
±0.7V
Operating Temperature .................................................... –40°C to +85°C
Storage Temperature ...................................................... –40°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
Hold Control .............................................................. –0.5V to +V
CC
+0.7V
NOTE: (1) Inputs are internally diode-clamped to
±V
CC
.
ELECTROSTATIC
DISCHARGE SENSITIVITY
Any integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet published speci-
fications.
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING TEMPERATURE
NUMBER
(1)
RANGE
010
235
–40°C to +85°C
–40°C to +85°C
PRODUCT
PACKAGE
SHC615AP
Plastic 14-Pin DIP
SHC615AU SO 14-Lead Surface-Mount
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
®
5
SHC615
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