Analog Devices Inc. AD9846AJSTRL

Overview

AD9846AJSTRL from Analog Devices is a complete 10-bit, 30 MSPS CCD signal processor IC designed for single-channel analog front-end conditioning of interlaced and progressive-scan CCD outputs. It integrates correlated double sampling (CDS), 6-bit pixel gain amplifier (PxGA), 10-bit VGA (2 dB to 36 dB), black-level clamp, and 10-bit ADC - all operating from a single 3 V supply with 117 mW typical power consumption in CCD mode.

For engineers reviewing the AD9846AJSTRL datasheet, AD9846AJSTRL pinout, AD9846AJSTRL application, or AD9846AJSTRL equivalent, key selection criteria include its 30 MHz CDS clock support, programmable PxGA color steering modes (e.g., Mosaic Separate, Interlace), 48-lead LQFP package compatibility, and dual auxiliary input modes (AUX1/AUX2) for analog video signal processing.

Technical Context

The AD9846AJSTRL implements a fully integrated CCD signal chain: input clamp removes optical black offset before amplification to preserve headroom and minimize gain-step error; CDS uses SHP/SHD rising edges with 3 ns internal aperture delay to reject reset kTC noise; PxGA applies pixel-wise gain via HD/VD-synchronized 4-value multiplexing across seven color steering modes.

Its VGA provides 1024-step digitally controlled gain (2–36 dB) with monotonic response and guaranteed accuracy over codes 91–1023; the 10-bit ADC delivers ±0.5 LSB DNL and no missing codes, with straight-binary output referenced to 2.0 V (VRT) and 1.0 V (VRB). System-level timing supports 9-cycle pipeline latency and 3-wire serial interface up to 10 MHz.

Key Specifications

Pinout & Package

AD9846AJSTRL is housed in a 48-lead thin plastic quad flatpack (LQFP), RoHS-compliant, with exposed pad not electrically connected. Pin 1 identifier located at top-left corner (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9844AJST and TDC1304IPWPR, the AD9846AJSTRL uniquely combines 10-bit 30 MSPS digitization, hardware-accelerated PxGA color steering, and CCD-optimized clamping - making it irreplaceable for high-fidelity color CCD imaging where per-pixel gain correction and black-level stability are mandatory.

Availability

AD9846AJSTRL is available at Aetrix Electronics and suitable for digital still cameras, industrial imaging systems, and machine vision inspection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant LQFP packaging.

Supply support for AD9846AJSTRL 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 AD9846A belongs to Analog Devices' CCD signal processor product line, engineered specifically for high-speed, low-noise analog conditioning of CCD sensor outputs in professional and industrial imaging applications.

FAQ

What is the maximum supported DATACLK frequency for AD9846AJSTRL?

The AD9846AJSTRL supports a maximum DATACLK frequency of 30 MHz, enabling full 10-bit sampling at 30 MSPS. This timing aligns with SHP and SHD clock periods of 32–33 ns and is validated across the full operating temperature range (–20°C to +85°C) with AVDD = DVDD = 3.0 V. Exceeding 30 MHz violates setup/hold timing and risks data corruption in the D0–D9 output bus.

Does AD9846AJSTRL support both progressive and interlaced CCD sensors?

Yes, AD9846AJSTRL natively supports both progressive and interlaced CCD architectures. Its PxGA color steering engine offers seven programmable modes - including Mosaic Separate (for progressive Bayer) and VD Selected/Interlace (for interlaced sensors) - all synchronized via HD and VD inputs. The internal timing logic automatically adapts clamp and sampling behavior to field/line structure without firmware intervention.

How does the optical black clamp function in AD9846AJSTRL?

The AD9846AJSTRL implements a closed-loop optical black clamp that compares the ADC output during shielded black pixel intervals against a user-programmed reference level (0–63.75 LSB). The resulting error drives an 8-bit DAC to adjust the ADC input baseline. This loop runs once per horizontal line by default but can be slowed for low-frequency drift compensation - critical for maintaining black-level stability across temperature and exposure time variations.

Can AD9846AJSTRL process non-CCD analog video signals?

Yes, AD9846AJSTRL supports two auxiliary analog input modes: AUX1IN accepts video signals with full 36 dB VGA range and 30 MSPS sampling, while AUX2IN provides 18 dB gain and identical timing. Both bypass CDS and PxGA but retain clamp, VGA, and ADC functionality - enabling reuse in composite video digitization or multi-source imaging systems without redesigning the analog signal path.

What power-down modes are available on AD9846AJSTRL and their recovery times?

AD9846AJSTRL offers three power-down modes: Fast Recovery (85 mW, 0.1 ms wake-up), Standby (5 mW, 1 ms), and Total Power-Down (1 mW, 3 ms). All are controlled via the Operation Register (D5–D6 bits) and retain register contents in Standby and Fast Recovery. Total Power-Down resets registers on wake-up. These modes enable dynamic power management in battery-powered or thermally constrained imaging systems.