Analog Devices Inc. AD9925BBCZRL

Overview

AD9925BBCZRL from Analog Devices is a complete 36 MHz CCD signal processor integrating a 10-channel vertical driver, Precision Timing™ generator (<600 ps resolution), correlated double sampler (CDS), 10-bit VGA (6–42 dB), and 12-bit ADC - designed for digital still cameras and CCD camera modules requiring high-fidelity analog front-end timing and signal conditioning.

For engineers reviewing the AD9925BBCZRL datasheet, AD9925BBCZRL pinout, AD9925BBCZRL application, or AD9925BBCZRL equivalent, key selection considerations include vertical clock drive capability (±7.5 V/15 V supplies), 3-field (6-phase) CCD support, register compatibility with AD9991/AD9995, and CSPBGA-96 package integration for compact imaging subsystems.

Technical Context

The AD9925BBCZRL implements a fully programmable analog front-end timing generator (AFETG) with a Precision Timing core synchronized to a 36 MHz CLI input, enabling independent edge placement of RG, H1–H4, SHP, and SHD clocks across 48 discrete positions per pixel period. Its dual-domain architecture separates AFE sampling control (CDS, clamp, VGA, ADC) from CCD clock generation (V-driver, H-driver, sync).

Vertical timing is handled by a dedicated 10-channel V-driver supporting both 2-level (V4, V6–V8) and 3-level (V1–V3A/B, V5A/B) outputs with programmable delay (100–200 ns) and slew (500 ns rise/fall), while horizontal timing uses four programmable H-drivers and an RG driver powered by separate HVDD/RGVDD rails.

Key Specifications

Pinout & Package

AD9925BBCZRL is housed in an 8 mm × 8 mm CSPBGA-96 package with 0.65 mm ball pitch. The package includes dedicated power domains (AVDD, TCVDD, HVDD, RGVDD, DRVDD, VDVDD, VH/VM/VL), isolated grounds, and 10 vertical driver outputs (V1–V8, V3A/B, V5A/B, SUBCK) alongside H1–H4, RG, CCDIN, DOUT[0:11], and serial control pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9995BCPZ, AD9925BBCZRL integrates vertical drive capability and reduces external component count; compared with TDA9984HN/C1, it serves a fundamentally different signal chain stage - analog CCD capture versus digital video encoding - making direct substitution infeasible.

Availability

AD9925BBCZRL is available at Aetrix Electronics and suitable for digital still cameras, CCD camera modules, and industrial inspection systems requiring stable component supply, long-lifecycle imaging ICs, and qualified operation from −25°C to +85°C.

Supply support for AD9925BBCZRL 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 measurement and signal conditioning.

The AD9925BBCZRL belongs to Analog Devices' CCD signal processor product line, engineered specifically to consolidate analog front-end functions, precision timing generation, and vertical clock driving into a single chip for high-fidelity imaging systems.

FAQ

What is the maximum clock rate supported by the AD9925BBCZRL CLI input?

The AD9925BBCZRL supports a maximum CLI (clock input) frequency of 36 MHz, as specified in the Absolute Maximum Ratings and Timing Specifications tables. This 36 MHz rate defines the pixel clock domain for the entire signal chain - including the 12-bit ADC, Precision Timing core, and horizontal/vertical clock generation. Operation above this frequency risks timing violation, metastability, or functional failure. The AD9925BBCZRL datasheet confirms this limit under "Maximum Clock Rate (CLI)" with no derating required at nominal supply voltages.

Does the AD9925BBCZRL include on-chip voltage references for the ADC?

Yes, the AD9925BBCZRL includes dedicated on-chip voltage references REFT (top, 2.0 V) and REFB (bottom, 1.0 V) that define the 2.0 V full-scale input range for the 12-bit ADC. These references are accessible via dedicated pins (L8 and L9) and require external 0.1 µF bypass capacitors. The AD9925BBCZRL datasheet specifies REFT/REFB accuracy and temperature drift in the Analog Specifications table, confirming their use as stable internal references - eliminating need for external reference ICs in most CCD imaging designs.

How many vertical driver outputs does the AD9925BBCZRL provide, and what are their voltage capabilities?

The AD9925BBCZRL provides ten vertical driver outputs: V1, V2, V3A, V3B, V4, V5A, V5B, V6, V7, and V8 - plus SUBCK and VSUB. Six (V1, V2, V3A/B, V5A/B) support 3-level operation (e.g., −7.5 V / 0 V / +15 V), while four (V4, V6–V8) support 2-level operation. The AD9925BBCZRL datasheet specifies VL = −10.0 to −6.0 V, VM = −1.0 to +3.0 V, and VH = +10.5 to +16.0 V, enabling direct interface to demanding CCD architectures without external level shifters.

Is the AD9925BBCZRL pin-compatible with the AD9991 or AD9995?

Yes, the AD9925BBCZRL is register-compatible with the AD9991 and AD9995, as explicitly stated in the Features section of its datasheet. However, it is not pin-compatible: the AD9925BBCZRL integrates a 10-channel V-driver absent in AD9991/AD9995, requiring different PCB layout and power routing (e.g., VH/VM/VL supplies). While firmware and register programming can be reused, physical replacement mandates board redesign due to differing pin count, function allocation, and package-level power domain separation.

What is the purpose of the CLO pin on the AD9925BBCZRL?

On the AD9925BBCZRL, the CLO (Clock Output) pin provides an inverted version of the CLI input clock and is designed to drive an external crystal connected between CLI and CLO, forming a self-contained crystal oscillator circuit. This eliminates the need for an external clock source in cost-sensitive or space-constrained designs. The AD9925BBCZRL datasheet details this configuration in Figure 72 and notes CLO's role in "on-chip driver for external crystal" under Features - confirming its dedicated function as a crystal sustain amplifier, not a general-purpose clock buffer.