SPT7610
6-BIT, 1 GSPS FLASH A/D CONVERTER
JANUARY 21, 2002
FEATURES
• 1:2 demuxed ECL-compatible outputs
• 1.0 GSPS conversion rate
• Wide input bandwidth: 1.4 GHz
• Low input capacitance: 8 pF
• Metastable errors reduced to 1 LSB
• Monolithic construction
• Binary/Two’s complement output
APPLICATIONS
• Radar, EW, ECM
• Direct RF down-conversion
• Microwave modems
• Industrial ultrasound
• Transient capture
• Test and measurement
GENERAL DESCRIPTION
The SPT7610 is a full parallel (flash) analog-to-digital con-
verter capable of digitizing full-scale (0 to –1 V) inputs into
six-bit digital words at an update rate of 1 GSPS. The
ECL-compatible outputs are demultiplexed into two sepa-
rate output banks, each with differential data-ready out-
puts to ease the task of data capture. The SPT7610’s wide
input bandwidth and low capacitance eliminate the need
for external track-and-hold amplifiers for most applica-
tions. A proprietary decoding scheme reduces metastable
errors to the 1 LSB level. The SPT7610 operates from a
single –5.2 V supply, with a nominal power dissipation of
2.75 W.
The SPT7610 is available in a 44L hermetic cerquad
surface-mount package in the industrial temperature
range (–40 °C to +85 °C).
BLOCK DIAGRAM
V
RT
Analog
Input
Preamp
Comparator
64
CLKCLK
CLOCK
BUFFER
DEMUX
CLOCK
BUFFER
63
64 TO 6 BIT DECODER
WITH METASTABLE ERROR CORRECTION
D6B
D6
(OVR)
D5
(MSB)
D5B
49
TESTA-
BILITY
TEST
ECL OUTPUT BUFFERS AND LATCHES
D4B
D3B
D2B
D1B
V
R3
48
33
1:2 DEMULTIPLEXER
D4
D0B
V
RM
32
D3
DRB (DATA READY)
DRB (DATA READY)
D6B (OVR)
D5B (MSB)
D4B
D3B
D2B
D1B
D0B (LSB)
DRA (DATA READY)
DRA (DATA READY)
D6A (OVR)
D5A (MSB)
D4A
D3A
D2A
D1A
D0A (LSB)
BANK B
D6A
D5A
D4A
D3A
D2A
D1A
17
D2
BANK A
V
R1
16
D1
2
DO
(LSB)
D0A
MINV
LINV
1
V
RB
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
