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.