SPT7720
8-BIT, 200 MSPS A/D CONVERTER
TECHNICAL DATA
MAY 9, 2001
FEATURES
• Pin-compatible with AD9054
• High conversion rate: 200 MSPS
• Less than ±1/2 LSB DLE
• 7.16 effective number of bits (ENOB) at 70 MHz
• Single +5 V power supply
• Internal THA and voltage reference
• Low power: 430 mW
• 500 MHz full-power bandwidth
• 1V
PP
input range
• Single or demuxed TTL output ports
• 44-lead TQFP
APPLICATIONS
• Digital sampling oscilloscopes (DSO)
• RGB video processing
• Digital communications
• High-speed instrumentation
• Projection display systems
GENERAL DESCRIPTION
The SPT7720 is an 8-bit, high-speed, analog-to-digital
converter implemented in a 0.5 µm BiCMOS process. It
utilizes a folding and interpolating architecture that pro-
vides both high sample rates and low power. The device
comes complete with a high bandwidth track-and-hold
amplifier and internal voltage reference.
The SPT7720 digital inputs interface directly to TTL,
CMOS or positive ECL (PECL) logic. The digital outputs
are user selectable in either single-channel or dual-chan-
nel modes. It is a pin-compatible, direct replacement for
the AD9054. The SPT7720 is available in a 44-lead TQFP
surface mount package over the industrial temperature
range of –40 to +85 °C.
BLOCK DIAGRAM
V
REF
IN
V
REF
OUT
AIN
AIN
+
Reference
THA
Quantizer
8
Channel A
ENCODE
ENCODE
DA
7
DA
0
Timing & Control
Binary
Encoder
Channel B
8
DB
7
DB
0
DEMUX DS
DS
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
