FLASH A/D CONVERTER
SPT7755
8-BIT, 750 MSPS, FLASH A/D CONVERTER
OCTOBER 2002
FEATURES
• • • • • • 1:2 Demuxed ECL compatible outputs Wide ...
Description
SPT7755
8-BIT, 750 MSPS, FLASH A/D CONVERTER
OCTOBER 2002
FEATURES
1:2 Demuxed ECL compatible outputs Wide input bandwidth – 900 MHz Low input capacitance – 15 pF Metastable errors reduced to 1 LSB Monolithic for low cost Gray code output
APPLICATIONS
Digital oscilloscopes Transient capture Radar, EW, ECM Direct RF down-conversion
GENERAL DESCRIPTION
The SPT7755 is a full parallel (flash) analog-to-digital converter capable of digitizing full scale (0 to –2 V) inputs into eight-bit digital words at an update rate of 750 MSPS. The ECL-compatible outputs are demultiplexed into two separate output banks, each with differential data ready outputs to ease the task of data capture. The SPT7755’s wide input bandwidth and low capacitance eliminate the need
for external track-and-hold amplifiers for most applications. A proprietary decoding scheme reduces metastable errors to the 1 LSB level. The SPT7755 operates from a single – 5.2 V supply, with a nominal power dissipation of 5.5 W. The SPT7755 is available in an 80-lead surface-mount MQuad package over the industrial temperature range (–25 °C to +85 °C).
BLOCK DIAGRAM
Analog VRT Input Preamp Comparator 256
CLK CLK CLOCK BUFFER DEMUX CLOCK BUFFER
255
D8 (OVR) D7 (MSB) D6
DRB (DATA READY) D8B D7B D6B D5B D4B D3B D2B DRB (DATA READY) D8B (OVR) D7B (MSB) D5B D6B
152
256 TO 8 Bit Decoder With Metastable Error Correction
ECL Output Buffers And Latches
151
D4B D3B D2B D1B D0B (LSB) DRA (DATA READY) DRA (D...
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