SPT7820
10-BIT, 20 MSPS, TTL OUTPUT, A/D CONVERTER
FEATURES
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Monolithic 20 MSPS Converter
On-Chip Track/Hold
Bipolar
±2.0
V Analog Input
60 dB SNR @ 1 MHz Input
Low Power (1.0 W Typical)
5 pF Input Capacitance
TTL Outputs
APPLICATIONS
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Medical Imaging
Professional Video
Radar Receivers
Instrumentation
Electronic Warfare
Digital Communications
GENERAL DESCRIPTION
The SPT7820 A/D converter is a 10-bit monolithic converter
capable of word rates of a minimum of 20 MSPS. On board
track/hold function assures excellent dynamic performance
without the need for external components. Drive require-
ment problems are minimized with an input capacitance of
only 5 pF.
Inputs and outputs are TTL compatible to interface with TTL
logic systems. An overrange output signal is provided to
indicate overflow conditions. Output data format is straight
binary. Power dissipation is very low at only 1.0 watt with
power supply voltages of +5.0 and -5.2 volts. The SPT7820
also provides a wide input voltage swing of
±2.0
volts.
The SPT7820 is available in 28-lead ceramic sidebrazed DIP,
PDIP and SOIC packages over the commercial, industrial
and military temperature ranges. Contact the factory for
availability of die and /883 versions.
BLOCK DIAGRAM
Analog
Input
Coarse
A/D
4
Analog
Prescaler
T/H Amplifier
Bank
Decoding Network
Digital
Output
10
Successive Interpolation
Stage i
Successive Interpolation
Stage i+1
Successive Interpolation
Stage N