OPA615 Datasheet, PDF (1/26 Pages) Texas Instruments – Wide-Bandwidth, DC Restoration Circuit

BurrĆBrown Products
from Texas Instruments
OPA615
SBOS299B – FEBRUARY 2004 – REVISED JULY 2005
Wide-Bandwidth, DC Restoration Circuit
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
Ground
C_HOLD
DESCRIPTION
The OPA615 is a complete subsystem for very fast
and precise DC restoration, offset clamping, and
low-frequency hum suppression of wideband ampli-
fiers 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 volt-
age-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 sur-
face-mount and an MSOP-10 package.
Base
Hold 7
Control
S/H 10
In+
S/H 11
In−
9
4
Switching
Stage
Sampling
Comparator (SC)
SOTA ^∞
3
OTA
Biasing
OPA615
13
+V_CC
5
−V_CC
2
Emitter
12 _Collector
(I_OUT)
1
I_Q Adjust
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated