Analog Devices Inc. AD9945KCPRL

Overview

AD9945KCPRL from Analog Devices is a complete 12-bit, 40 MSPS CCD signal processor IC featuring correlated double sampling (CDS), a 10-bit digitally controlled VGA (6 dB to 40 dB gain), optical black clamp circuitry, and a 12-bit A/D converter - all integrated in a single 32-lead LFCSP package for digital still cameras and camcorders.

For engineers reviewing the AD9945KCPRL datasheet, AD9945KCPRL pinout, AD9945KCPRL application, or AD9945KCPRL equivalent, this device supports precise analog front-end conditioning of interlaced/progressive CCD outputs with programmable gain, black-level clamping, and 3-wire serial register control under single 3 V supply operation.

Technical Context

The AD9945KCPRL implements a fully integrated CCD analog signal chain: CDS samples reference and data levels on SHP/SHD rising edges with 3 ns internal aperture delay; the 10-bit VGA provides monotonic 1024-step gain control using a linear-in-dB transfer function (VGA Gain(dB) = 0.035 × Code + 5.3); and the optical black clamp uses CLPOB-synchronized feedback with 256-step resolution to correct residual DC offsets at the ADC input.

Its 12-bit pipelined ADC delivers guaranteed no-missing-codes performance over –20°C to +85°C, with 0.5 mV/LSB scaling (2 V full-scale), ±0.5 LSB DNL, and 1.2 LSB_rms total output noise at 6 dB gain; timing is synchronized via DATACLK (40 MHz max), with 10-cycle pipeline latency and 9.5 ns output delay.

Key Specifications

Pinout & Package

AD9945KCPRL is housed in a 32-lead Lead Frame Chip Scale Package (LFCSP_WQ), 5 mm × 5 mm body, very thin quad, JEDEC MO-220-WHHD compliant, with exposed thermal pad soldered to PCB ground plane per datasheet recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9945KCPRL, AD9943KCPZ offers identical timing and control architecture but trades resolution for cost, whereas TVP5150AM1 belongs to a different product category altogether and cannot fulfill the CCD analog front-end role without major redesign.

Availability

AD9945KCPRL is available at Aetrix Electronics and suitable for digital still cameras, digital video camcorders, and CCTV systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AD9945KCPRL 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and imaging applications.

The AD9945KCPRL belongs to Analog Devices' CCD signal processor product line, engineered specifically to integrate CDS, VGA, clamping, and ADC functions into a single chip for compact, low-power digital imaging systems.

FAQ

What is the required start-up sequence for the AD9945KCPRL?

The AD9945KCPRL requires a mandatory start-up write of 0x838 to Register 0xD within 1 ms after power-on to ensure proper initialization. This value configures internal calibration and timing parameters; failure to issue this command may result in undefined behavior or incorrect signal processing. The AD9945KCPRL internal power-on reset circuitry completes in ~1 ms, after which serial writes become effective.

Does the AD9945KCPRL support both interlaced and progressive scan CCDs?

Yes, the AD9945KCPRL supports both interlaced and progressive scan CCD arrays through its flexible CDS timing architecture. Its SHP and SHD inputs accept independently timed sampling pulses aligned to CCD reference and data levels, and the CLPOB-driven optical black clamp adapts to line-based or frame-based black pixel intervals - making it compatible with diverse CCD timing formats used in digital still cameras and camcorders.

How does the optical black clamp function in the AD9945KCPRL?

The AD9945KCPRL optical black clamp operates during the CLPOB pulse interval by comparing the ADC output against a user-programmed 8-bit clamp level register value, generating an error signal filtered and applied via an internal 8-bit DAC to the ADC input. This closed-loop correction removes residual DC offsets and tracks low-frequency black-level variations line-by-line, ensuring consistent image black level across temperature and time without external components.

What is the power consumption profile of the AD9945KCPRL at 40 MSPS?

At 40 MSPS operation with 3.0 V supplies, the AD9945KCPRL consumes ≤160 mW in normal mode excluding DRVDD power, plus up to 10 mW for DRVDD (C_LOAD = 20 pF), and drops to 1.5 mW in power-down mode. This low-power profile enables use in battery-operated devices such as portable camcorders and PC cameras while maintaining full 12-bit performance.

Can the AD9945KCPRL's digital outputs be three-stated, and how is this controlled?

Yes, the AD9945KCPRL's D0–D11 digital outputs can be placed in high-impedance (three-state) mode via Bit D4 in the Control Register, accessible through the 3-wire serial interface. Setting this bit to '1' disables output drivers, allowing multiple AD9945KCPRL devices or other peripherals to share a common data bus without contention - essential in multi-sensor or modular imaging architectures.