Analog Devices Inc. AD7828UQ

Overview

AD7828UQ from Analog Devices is an 8-channel, 8-bit LC2MOS successive-approximation analog-to-digital converter with built-in track/hold, single 5 V supply operation, ±1/2 LSB total unadjusted error, and 2.5 µs per-channel conversion time. It digitizes full-scale 10 kHz signals (157 mV/µs slew rate) across all eight inputs and interfaces directly to Z80, MC68000, and TMS32010 microprocessors without external clocking.

For engineers reviewing the AD7828UQ datasheet, AD7828UQ pinout, AD7828UQ application, or AD7828UQ equivalent, this page delivers verified specifications, validated pin functions, confirmed military-grade temperature range (–55°C to +125°C), and real-world interface timing for embedded data acquisition systems requiring high channel density and deterministic sampling.

Technical Context

The AD7828UQ employs a half-flash architecture: two 4-bit flash ADCs-one for MSBs, one for LSBs-combined with an internal 4-bit DAC to reconstruct and subtract the MSB approximation, enabling 8-bit resolution without external clock generation. Its analog input structure inherently provides sample-and-hold behavior over ~1 µs, eliminating need for external S/H in ≤10 kHz applications.

Digital control uses CS and RD signals to initiate conversions and read data; Mode 0 supports WAIT-state microprocessors (e.g., Z80), while Mode 1 enables non-WAIT operation (e.g., TMS32010). Address lines A0–A2 select among eight analog inputs (AIN1–AIN8), and outputs DB0–DB7 are three-state with open-drain RDY and active-low INT status signals.

Key Specifications

Pinout & Package

AD7828UQ is supplied in a 28-lead Cerdip (Q-28) hermetic ceramic DIP package, rated for extended temperature operation and MIL-STD-883 compliance. Pin layout matches standard 28-pin DIP footprint with 0.6" width and 0.1" lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel, 8-bit ADC applications.

Compared with AD7828CQ, AD7828UQ adds 40°C lower minimum operating temperature and MIL-STD-883 qualification, while compared with MAX118ACNG+, it trades resolution for deterministic parallel interface, zero-clock operation, and integrated track/hold-critical for real-time embedded control loops.

Availability

AD7828UQ is available at Aetrix Electronics and suitable for avionics sensor acquisition, industrial process monitoring, and test equipment data capture requiring stable component supply, long-term obsolescence mitigation, and traceable MIL-qualified sourcing.

Supply support for AD7828UQ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7828UQ belongs to Analog Devices' legacy high-speed multichannel ADC product line, designed specifically for embedded data acquisition systems demanding deterministic timing, minimal external components, and ruggedized packaging for mission-critical environments.

FAQ

What is the operating temperature range of the AD7828UQ?

The AD7828UQ is rated for –55°C to +125°C operation, qualifying it for extended industrial, aerospace, and defense applications. This range is confirmed in the Ordering Guide and Absolute Maximum Ratings sections of the AD7828 datasheet Rev. E, and reflects full specification compliance-including ±1/2 LSB total unadjusted error-across the entire interval.

Does the AD7828UQ require an external clock signal?

No, the AD7828UQ does not require an external clock. Its half-flash conversion architecture uses internal timing circuitry triggered solely by CS and RD control signals. This eliminates clock generation, distribution, and jitter concerns-confirmed in the General Description and Timing and Control sections of the datasheet.

How many analog input channels does the AD7828UQ support?

The AD7828UQ supports eight single-ended analog input channels (AIN1 through AIN8), selected via the A0, A1, and A2 address inputs. This is explicitly stated in the Functional Block Diagram, Pin Configurations, and OPERATIONAL DIAGRAM sections of the AD7828 datasheet Rev. E.

What package type is used for the AD7828UQ?

The AD7828UQ is packaged in a 28-lead Cerdip (Q-28) hermetic ceramic DIP, as specified in the Ordering Guide and Outline Dimensions sections. This package meets MIL-STD-883 requirements and supports the –55°C to +125°C operating range.

Can the AD7828UQ interface directly with a Z80 microprocessor?

Yes, the AD7828UQ interfaces directly with the Z80 in Mode 0, using RDY to assert the WAIT input and synchronize conversion completion with instruction execution. The datasheet Rev. E includes a complete schematic (Figure 16) and timing diagram (Figure 14) confirming full hardware compatibility without additional logic.