SPT7721
8-BIT, 250 MSPS ADC WITH DEMUXED OUTPUTS
TECHNICAL DATA
NOVEMBER 8, 2001
FEATURES
• TTL/CMOS/PECL compatible
• High conversion rate: 250 MSPS
• Single +5 V power supply
• Very low power dissipation: 310 mW
• Power-down mode
• +3.0 V/+5.0 V (LVCMOS) digital output logic
compatibility
• Demuxed output ports
APPLICATIONS
• RGB video processing
• Digital communications
• High-speed instrumentation
• Projection display systems
GENERAL DESCRIPTION
The SPT7721 is a high-speed, 8-bit analog-to-digital con-
verter implemented in an advanced BiCMOS process. An
advanced folding and interpolating architecture provides
both a high conversion rate and very low power dissipation
of only 310 mW. The analog inputs can be operated in
either single-ended or differential input mode. A 2.5 V com-
mon mode reference is provided on chip for the single-
ended input mode to minimize external components.
The SPT7721 digital outputs are demuxed (double-wide)
with both dual-channel and single-channel selectable out-
put modes. Demuxed mode supports either parallel
aligned or interleaved data output. The output logic is both
+3.0 V and +5.0 V compatible. The SPT7721 is available in
a 44-lead TQFP surface mount package over the industrial
temperature range of –40 to +85 °C.
BLOCK DIAGRAM
AGND
DGND
AV
CC
OV
DD
V
IN
+
V
IN
8-Bit
250 MSPS
ADC
CLK
CLK
Data Output Latches
DA
0
DA
7
DB
0
DB
7
Common Mode
Voltage
Reference
Data Output
Mode Control
2
2
DCLK
OUT
DCLK
OUT
+2.5 V
V
CM
PD
CLK CLK
Reset DMODE
1,2
&
Reset
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
