SPT7755

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...