SPT7936

12-BIT, 28 MSPS SAMPLING A/D CONVERTER

FEATURES

• 3.0-3.6 V Power Supply

• Low power: (260 mW @3.3 V)

• Sample Rate: 28 MSPS

• Internal Sample/Hold

• Differential Input

• Sleep Mode (Power Down)

APPLICATIONS

• 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.

Digital Delays, Error Correction and Output Register

Ref Buff

Ref Buff

BGREF

BIAS CELL

Bias 0 Bias 1

CM

Ext Ref

THA

Clock

Driver

VREF+

VREF-

VIN+

VIN-

Clock

Stage 1

Stage 2

Stage 3

Stage 10

Stage_Last

(2-Bit Flash)

OR

Bit <11...0)

BGAP

BLOCK DIAGRAM