Analog Devices Inc. AD9891KBC

Overview

AD9891KBC from Analog Devices is a 10-bit, 20 MHz CCD signal processor with integrated Precision Timing™ generator, Correlated Double Sampler (CDS), 4 dB/6 dB PxGA®, 10-bit VGA (2–36 dB), and on-chip 5 V horizontal/RG drivers. It serves as the complete analog front end and timing controller for CCD-based imaging systems, enabling precise pixel-level clocking and digitization in digital still cameras.

For engineers reviewing the AD9891KBC datasheet, AD9891KBC pinout, AD9891KBC application, or AD9891KBC equivalent, this device is selected for high-fidelity CCD readout where sub-ns timing resolution, programmable black-level clamping, and integrated H/V clock generation are required - especially in space-constrained, low-power consumer imaging designs.

Technical Context

The AD9891KBC implements a dedicated Precision Timing core synchronized to a 20 MHz CLI input, delivering 1 ns edge resolution for RG, H1–H4, SHP, and SHD clocks. Its analog front end includes cascaded CDS, PxGA (64-step gain control), and VGA (1024-step, monotonic 2–36 dB range), all referenced to a 2.0 V / 1.0 V internal voltage reference (VRT/VRB).

Timing is fully programmable via a 3-wire serial interface (SCK up to 10 MHz); all CCD clocks - including 4-phase vertical transfer (V1–V4), 8-sensor gate pulses (VSG1–VSG8), SUBCK, VSUB, and sync signals (HD/VD) - are generated on-chip. The device operates in Master or Slave mode and supports mechanical shutter (MSHUT) and strobe (STROBE) outputs.

Key Specifications

Pinout & Package

AD9891KBC is housed in a 64-lead CSPBGA (BC-64) package with 0.5 mm pitch and 6 mm × 6 mm body size. Thermal resistance is θ_JA = 61°C/W and θ_JC = 29.7°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD signal processing applications.

Compared with AD9895KBC and TDC1350YFPR, the AD9891KBC offers optimal balance of integration, power efficiency (380 mW), and 10-bit fidelity for cost-sensitive consumer imaging, while avoiding the overhead of external timing or driver components.

Availability

AD9891KBC is available at Aetrix Electronics and suitable for digital still cameras, industrial machine vision systems, and medical endoscopy equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9891KBC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9891KBC belongs to Analog Devices' Precision Timing™ CCD signal processor family, designed specifically to replace multi-chip CCD interface solutions with a single, programmable, low-power IC for compact, high-fidelity imaging systems.

FAQ

What is the maximum pixel clock frequency supported by the AD9891KBC?

The AD9891KBC supports a maximum CLI (clock input) frequency of 20 MHz, which defines its upper limit for CCD pixel readout rate. At this frequency, the Precision Timing core achieves 1 ns edge resolution for all high-speed clocks including RG, H1–H4, SHP, and SHD. Exceeding 20 MHz may cause timing violations or ADC undersampling; the AD9891KBC is not rated for operation beyond this specification.

Does the AD9891KBC include on-chip drivers for vertical CCD clocks (V1–V4)?

No, the AD9891KBC does not integrate drivers for V1–V4 vertical transfer clocks. These outputs are logic-level digital signals requiring an external V-driver IC to meet the voltage swing and current demands of CCD vertical registers. In contrast, the AD9891KBC does include fully integrated 5 V-tolerant drivers for H1–H4 and RG, eliminating the need for external buffers in the horizontal timing path.

How is black level correction implemented in the AD9891KBC?

The AD9891KBC implements optical black clamp correction after the VGA stage, with 256-step resolution and a 0–63.75 LSB adjustment range measured at the ADC output. Clamp level is programmable via register control and applied to remove fixed-pattern offset, ensuring accurate DC restoration prior to 10-bit digitization. This occurs independently of CDS and is optimized for CCDs with dedicated optical black pixels.

Can the AD9891KBC operate in both Master and Slave timing modes?

Yes, the AD9891KBC supports both Master and Slave modes. In Master mode, it generates all timing signals (HD, VD, H1–H4, RG, etc.) from the CLI input. In Slave mode, it synchronizes to externally supplied HD and VD signals while still generating internal clocks - allowing tight system-level coordination with host processors or ASICs managing overall frame timing.

What is the purpose of the CLO pin on the AD9891KBC?

The CLO (Clock Output) pin on the AD9891KBC provides an inverted replica of the CLI input clock and is intended to drive an external crystal placed between CLI and CLO. This forms a self-contained crystal oscillator circuit, enabling precise, low-jitter master clock generation without requiring an external oscillator IC - simplifying design and improving timing stability in compact camera modules.