Analog Devices Inc. AD9991KCP

Overview

AD9991KCP from Analog Devices is a 10-bit CCD signal processor with integrated Precision Timing™ generator, designed for digital still cameras and camcorders. It delivers 27 MHz pixel-rate A/D conversion, 6 dB to 42 dB programmable VGA gain, correlated double sampling (CDS), black level clamping, and full on-chip timing generation with 800 ps resolution at 27 MHz.

For engineers reviewing the AD9991KCP datasheet, AD9991KCP pinout, AD9991KCP application, or AD9991KCP equivalent, key selection considerations include vertical clock phase support (4- and 6-phase), H-driver output current programmability (0–30 mA per output), LFCSP-56 thermal performance (θ_JA = 25°C/W), and 3-wire serial interface register control of SHP/SHD sampling location and DCLK phase alignment.

Technical Context

The AD9991KCP implements a dual-domain architecture: an analog front end (AFE) with CDS, VGA, clamp, and 10-bit 27 MHz ADC; and a high-speed timing core generating RG, H1–H4, V1–V6, VSG1–VSG5, SUBCK, and MSHUT/STROBE signals. All timing edges are programmable across 48 positions per pixel period with 800 ps resolution at 27 MHz CLI input.

It supports Master mode (generating HD/VD sync from CLI) and Slave mode (synchronizing to external HD/VD), with pipeline latency fixed at 11 cycles from SHD sampling to DOUT availability. Horizontal blanking (CLPOB/PBLK/HBLK) and vertical sequencing (10 independent V-sequences) are fully register-configurable for multi-region field readout.

Key Specifications

Pinout & Package

AD9991KCP is housed in a 56-lead Lead Frame Chip Scale Package (LFCSP-56, CP-56), featuring an exposed thermal paddle soldered to PCB ground for θ_JA = 25°C/W performance. The package supports fine-pitch surface-mount assembly and meets industrial thermal requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA9981, AD9991KCP integrates full timing generation and eliminates external logic, reducing BOM count and layout complexity; compared with ISL12022M, AD9991KCP serves a distinct signal-processing role-no functional overlap exists, confirming AD9991KCP's unique positioning in CCD imaging systems.

Availability

AD9991KCP is available at Aetrix Electronics and suitable for digital still camera, industrial machine vision, and medical endoscopy applications requiring stable component supply, long-lifecycle support, and guaranteed -20°C to +85°C operation.

Supply support for AD9991KCP 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 AD9991KCP belongs to Analog Devices' Precision Timing™ CCD signal processor family, engineered specifically for high-fidelity, low-noise imaging in digital photography and video systems where timing accuracy and analog signal integrity are critical.

FAQ

What is the maximum pixel clock frequency supported by the AD9991KCP?

The AD9991KCP supports a maximum CLI (clock input) frequency of 27 MHz, which defines its upper pixel rate limit. This enables real-time digitization of high-resolution CCD outputs with minimal pipeline latency. At 27 MHz, the Precision Timing™ core achieves 800 ps resolution per edge position. The AD9991KCP datasheet specifies this value under "Maximum Clock Rate (CLI)" with no derating required across the –20°C to +85°C operating range.

Does the AD9991KCP include on-chip drivers for all CCD clock signals?

No-the AD9991KCP integrates on-chip drivers only for RG and H1–H4 outputs, each programmable from 0 to 30 mA. Vertical clocks (V1–V6), sensor gate pulses (VSG1–VSG5), and SUBCK require external V-driver circuitry. This architecture balances integration and flexibility: horizontal timing is tightly coupled to pixel sampling, while vertical timing benefits from higher-voltage, higher-current external drivers suited to CCD substrate requirements.

How many independent vertical timing sequences does the AD9991KCP support?

The AD9991KCP supports up to 10 independent vertical timing sequences (V-sequences), each assignable to different regions of a CCD field. Each sequence can define unique CLPOB, PBLK, and HBLK patterns, enabling adaptive blanking and clamping during fast-scan, partial-readout, or multi-region exposure modes. This capability is implemented via dedicated register banks and is confirmed in the "Vertical Timing Generation" section of the AD9991KCP datasheet.

What is the pipeline latency from SHD sampling to valid DOUT data in the AD9991KCP?

The AD9991KCP exhibits a fixed pipeline latency of 11 clock cycles from SHD (sample hold) event to valid DOUT data availability. This value is specified in the "Digital Data Outputs" section and verified in Figure 8b ("Pipeline Delay") of the AD9991KCP datasheet. The latency remains constant regardless of DOUTPHASE or DCLKMODE register settings, simplifying system-level timing budgeting for downstream image processors.

Can the AD9991KCP operate without an external crystal oscillator?

Yes-the AD9991KCP can operate without an external crystal by accepting a clean 27 MHz CLI clock directly from an image processor or system clock source. Alternatively, it supports crystal-based operation using the on-chip CLO output (inverse of CLI) to drive a crystal between CLI and CLO pins. This dual-mode clocking flexibility is documented in the "PRECISION TIMING HIGH SPEED TIMING GENERATION" section and Figure 39 of the AD9991KCP datasheet.