SPT7921 Datasheet, PDF (1/11 Pages) Cadeka Microcircuits LLC. – 12-BIT, 20 MSPS, TTL, A/D CONVERTER

SPT7921
12-BIT, 20 MSPS, TTL, A/D CONVERTER
FEATURES
• Monolithic
• 12-Bit 20 MSPS Converter
• 66 dB SNR @1 MHz Input
• On-Chip Track/Hold
• Bipolar ±2.0 V Analog Input
• Low Power (1.1 W Typical)
• 5 pF Input Capacitance
• TTL Outputs
APPLICATIONS
• Radar Receivers
• Professional Video
• Instrumentation
• Medical Imaging
• Electronic Warfare
• Digital Communications
• Digital Spectrum Analyzers
• Electro-Optics
GENERAL DESCRIPTION
The SPT7921 A/D converter is the industry's first 12-bit
monolithic analog-to-digital converter capable of sample
rates greater than 20 MSPS. On board input buffer and
track/hold function assures excellent dynamic perfor-
mance without the need for external components. Drive
requirement problems are minimized with an input ca-
pacitance of only 5 pF.
Logic inputs and outputs are TTL. An overrange output signal
is provided to indicate overflow conditions. Output data
format is straight binary. Power dissipation is very low at only
1.1 watts with power supply voltages of +5.0 and -5.2 volts.
The SPT7921 also provides a wide input voltage range of
±2.0 volts.
The SPT7921 is available in 32-lead ceramic sidebrazed DIP
and 44-lead cerquad packages over the commercial tem-
perature range. Consult the factory for availability of die,
military temperature and /883 versions.
BLOCK DIAGRAM
V_IN
Input
Buffer
Analog Gain
Compression
Processor
4-Bit Flash
Converter
Track-and-Hold
Amplifiers
4
Asynchronous
SAR
8
Error
Correction,
Decoding
and
Output TTL
12
Drivers
Digital
Output