FEATURES

· 12-Bit, 21-MSPS, Analog-to-Digital

Converter

· Low Power: 70 mW Minimum

Power-Down Mode: 4 mW

· Low Input-Referred Noise: 75-dB

SNR Typical at 0-dB Gain

· Novel Optical-Black (OB) Calibration

· Low-Aperture Delay

· Single 3-V Supply Operation

· DNL: <±0.5 LSB and

INL: <±1.5 LSB Typical at 0-dB Gain

· Programmable-Gain Range: 0 dB to 36 dB,

Gain Resolution of 0.05 dB/Step

· 48-Pin TQFP Package

APPLICATIONS

· Digital Still Camera

· Digital Video Camera

DESCRIPTION

The VSP1221 is a highly-integrated mixed-signal IC

used for signal conditioning and analog-to-digital

conversion at the output of a CCD array. The IC has

correlated double sampler (CDS) and an analog

programmable-gain amplifier (PGA) stage followed by

analog-to-digital converter (ADC) and a digital

PGA stage. The CDS is used to sample the CCD

signal and is followed by the analog PGA stage. The

ADC is a12-bit, 21-MSPS pipelined ADC. The digital

PGA provides further amplification.

Additionally, there is an offset calibration loop for

optical-black correction. The optical-black reference

level is user-programmable. The chip also has two

bit digital-to-analog converters (DAC) for external

analog settings.

The chip has a serial port for configuring internal

control registers.

The VSP1221 is available in a 48-pin TQFP package

and operates from a single 3-V power supply.