AD9846AJST

Overview

The AD9846AJST is a complete analog signal processor for CCD applications, featuring a 30 MHz single-channel architecture. It includes a 10-bit 30 MSPS A/D converter, correlated double sampler (CDS), Pixel Gain Amplifier (PxGA) with 6-bit gain control, and a 2 dB to 36 dB variable gain amplifier (VGA). The device operates from a single 3 V supply, dissipating 117 mW in normal operation. It supports multiple power-down modes, including standby at 5 mW and total power-down at 1 mW. The component is housed in a 48-lead LQFP package.

Feature Summary

• Integrates a 10-bit 30 MSPS ADC with a full-signal chain for CCD conditioning
• Features a programmable PxGA for per-pixel color gain adjustment
• Includes a high-resolution VGA for precise signal amplification
• Supports low-power operation with multiple configurable shutdown states

Applications

• Digital still cameras
• Digital video camcorders
• Industrial imaging systems

Procurement Notes

Verify the specific suffix 'JST' against official documentation to confirm the exact temperature range and packaging details. Ensure ESD precautions are strictly followed during handling due to the sensitivity of the CMOS circuitry. Confirm that the 48-lead LQFP footprint matches the target PCB layout requirements before finalizing procurement.

Selection Notes

Select this component when a single-supply solution is required for interlaced or progressive scan CCD arrays. The integrated PxGA is suitable for applications requiring hardware-level white balance correction. Verify that the 30 MHz maximum clock rate aligns with the target sensor's output speed and that the 3 V supply voltage is compatible with the system design.

Part Context

The AD9846A belongs to Analog Devices' family of CCD signal processors designed for compact imaging solutions. The AJST variant specifically denotes the -20°C to +85°C operating temperature range and the Thin Plastic ST-48 Quad Flatpack (LQFP) package option. This part integrates functions typically found in discrete front-end architectures into a single chip.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.