SPT7936
12-BIT, 28 MSPS SAMPLING A/D CONVERTER
FEATURES
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3.0-3.6 V Power Supply
Typical SINAD: 60 dB for (f
IN
= 10 MHz)
Low power: (260 mW @3.3 V)
Sample Rate: 28 MSPS
Internal Sample/Hold
Differential Input
Sleep Mode (Power Down)
APPLICATIONS
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Imaging
Test Equipment
Computer Scanners
Communications
Set-Top Boxes
GENERAL DESCRIPTION
The SPT7936 is a compact, high-speed, low power 12-bit
monolithic analog-to-digital converter, implemented in a
0.5
µm
CMOS process. The converter includes sample and
hold. The full scale range can be set between
±0.6
V and
±1.2
V using external references. It operates from a single 3.0-3.6
V supply-compatible with modern digital systems. Most con-
verters in this performance range demand at least a +5 V
supply. Its low distortion and high dynamic range offers the
performance needed for demanding imaging, multimedia,
telecommunications and instrumentation applications.
The SPT7936 has a pipelined architecture - resulting in low
input capacitance. Digital error correction of the 11 most
significant bits ensures good linearity for input frequencies
approaching Nyquist.
The device is available in a 44L TQFP package over the
commercial temperature range of 0 to +70
°C.
BLOCK DIAGRAM
BGAP
Bias 0 Bias 1
CM
Ref Buff
Ref Buff
BGREF
BIAS CELL
Ext Ref
VREF+
VREF-
VIN+
VIN-
THA
Stage 1
Stage 2
Stage 3
Stage 10
Stage_Last
(2-Bit Flash)
Clock
Clock
Driver
Digital Delays, Error Correction and Output Register
OR
Bit <11...0)
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
