Analog Devices Inc. AD9948KCPZ

Overview

AD9948KCPZ from Analog Devices is a 10-bit CCD signal processor with integrated Precision Timing™ core, CDS, PxGA (0–18 dB), VGA (6–42 dB), and 25 MSPS ADC - designed for digital still camera front-ends requiring precise pixel-level timing control and analog signal conditioning.

For engineers reviewing the AD9948KCPZ datasheet, AD9948KCPZ pinout, AD9948KCPZ application, or AD9948KCPZ equivalent, key selection criteria include 800 ps timing resolution, 40-lead LFCSP package compatibility, black-level clamp programmability, and support for 3 V H-driver outputs in high-speed imaging systems.

Technical Context

The AD9948KCPZ implements a fully integrated analog front-end (AFE) with correlated double sampling, pixel gain amplification, variable gain amplification, and 10-bit digitization - all synchronized to a 25 MHz CLI master clock. Its Precision Timing core divides each pixel period into 48 edge positions (800 ps resolution), enabling independent programming of RG, H1–H4, SHP, and SHD edges.

Timing generation is controlled via 3-wire serial interface (up to 10 MHz SCK), with register-mapped edge locations, drive current control (0–30.1 mA per output), and DOUT phase adjustment across 48 positions. All high-speed clocks are derived from CLI with fixed 6 ns internal delay (tCLIDLY).

Key Specifications

Pinout & Package

AD9948KCPZ is housed in a 40-lead Lead Frame Chip Scale Package (LFCSP), thermally enhanced with exposed paddle soldered to PCB ground plane (θ_JA = 27°C/W). Package option CP-40 is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9949KCPZ and TDC1021IPWPR, AD9948KCPZ uniquely balances 25 MSPS throughput, 10-bit fidelity, and 800 ps timing resolution in a single chip - making it optimal for high-speed digital still cameras where both speed and precise sampling window control are mandatory.

Availability

AD9948KCPZ is available at Aetrix Electronics and suitable for digital still camera modules, industrial machine vision systems, and medical endoscopy equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD9948KCPZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9948KCPZ belongs to Analog Devices' Precision Timing™ CCD signal processor product line, engineered specifically for high-fidelity, high-speed digital imaging systems demanding integrated analog front-end functionality and nanosecond-accurate clock generation.

FAQ

What is the maximum pixel clock frequency supported by the AD9948KCPZ?

The AD9948KCPZ supports a maximum CLI (master clock) frequency of 25 MHz, enabling full-speed operation at 25 million pixels per second. This is specified across the full operating temperature range (–20°C to +85°C) and matches the ADC's 25 MSPS sampling rate. The Precision Timing core maintains 800 ps resolution at this rate by dividing the CLI period into 48 steps.

Does the AD9948KCPZ require external CCD clock drivers?

No, the AD9948KCPZ integrates on-chip drivers for RG and H1–H4 outputs, each capable of delivering up to 30.1 mA into typical CCD loads. These drivers operate from dedicated HVDD and RGVDD supplies (2.7–3.6 V) and support programmable current levels in 4.1 mA steps via the DRVCONTROL register - eliminating the need for external level shifters or buffer ICs.

How is black level clamping implemented in the AD9948KCPZ?

The AD9948KCPZ implements optical black (OB) clamping using an internal circuit that samples dark pixels and adjusts the baseline level before ADC conversion. Clamp level is programmable in 256 steps (0–63.75 LSB at ADC output), with selectable fast/normal settling modes and enable/disable control via the OPRMODE register. Clamping occurs after CDS and PxGA stages but before VGA and ADC.

Can the AD9948KCPZ generate multiple independent blanking sequences?

Yes, the AD9948KCPZ supports fully programmable CLPOB, PBLK, and HBLK signals using dedicated register banks (Tables IV–VI). Each signal can be configured with up to four independent sequences, each defined by toggle positions, polarities, and region-based activation - enabling complex blanking patterns across different image regions (e.g., pre-scan, active pixel, post-scan) without external logic.

What power supply domains does the AD9948KCPZ use, and why are they separated?

The AD9948KCPZ employs five independent supply domains: AVDD (AFE analog), DVDD (digital logic), DRVDD (data output drivers), HVDD (H1–H4 drivers), and RGVDD (RG driver). This separation minimizes noise coupling between sensitive analog signal paths and noisy digital/switching outputs, preserving ADC SNR and timing jitter performance - critical for high-fidelity CCD imaging.