GENERAL DESCRIPTION

The AD9990 is a highly integrated CCD signal processor for digital still camera applications. It includes a complete analog front end with analog-to-digital conversion and a full-function, programmable timing generator for a 2-channel output CCD. Each channel is specified up to 32 MHz. The timing generator is capable of supporting up to 24 vertical clock signals to control advanced CCDs. A Precision Timing® core allows adjustment of high speed clocks with ~488 ps resolution at 32 MHz operation. The AD9990 also contains eight general-purpose outputs that can be used for shutter and system functions.

Each analog front end includes black level clamping, a CDS, a VGA, and a 14-bit ADC. The timing generator provides all the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate pulses, substrate clock, and substrate bias control.

The AD9990 is specified over an operating temperature range of −25°C to +85°C.

FEATURES

  1.8 V AFETG core

  Internal LDO regulators

  24 programmable vertical clock signals

  Correlated double sampler (CDS) with −3 dB, 0 dB, +3 dB, and +6 dB gain

  6 dB to 42 dB, 10-bit variable gain amplifier (VGA)

  14-bit, 32 MHz analog-to-digital converter (ADC)

  Black level clamp with variable level control

  Complete on-chip timing generator

  Precision Timing core with ~488 ps resolution

  On-chip 3 V horizontal and RG drivers

  General-purpose outputs (GPOs) for shutter and system support

  On-chip driver for external crystal

  On-chip sync generator with external sync input

  112-ball CSP_BGA package, 8 mm × 8 mm, 0.65 mm pitch

APPLICATIONS

  Digital still cameras