Analog Devices Inc. AD7576JP

Overview

AD7576JP from Analog Devices is an obsolete 8-bit successive-approximation analog-to-digital converter (ADC) with 10 µs conversion time, LC2MOS process technology, and µP-compatible parallel interface. It operates over 0°C to +70°C, uses a 20-pin PLCC package, and targets low-cost data acquisition in commercial-grade embedded systems.

For engineers reviewing the AD7576JP datasheet, AD7576JP pinout, AD7576JP application, or AD7576JP equivalent, key selection considerations include its 10 µs conversion speed, single +5 V supply operation, on-chip clock generator, 8-bit resolution, and compatibility with 8-bit microprocessor data buses.

Technical Context

The AD7576JP implements a successive-approximation register (SAR) architecture with internal clock generation, eliminating external timing components. It features a track-and-hold amplifier, reference input (VREF), and digital output latching synchronized to RD and CS signals.

Its LC2MOS process enables single +5 V supply operation and TTL/CMOS-compatible digital I/O. The device requires no external trim components and supports both unipolar and bipolar input configurations via external resistor networks.

Key Specifications

Pinout & Package

AD7576JP is housed in a 20-pin Plastic Leaded Chip Carrier (PLCC) with J-lead configuration, 0.4-inch body size, and standard JEDEC MO-047A outline. Pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7576JP, AD7574JN and MAX160CPE both require external clock sources and lack integrated track-and-hold, increasing system component count and reducing board-level integration - AD7576JP remains superior for compact, self-contained 8-bit ADC implementations where PLCC packaging is viable.

Availability

AD7576JP is available at Aetrix Electronics and suitable for industrial data loggers, medical instrumentation, automotive test equipment, and consumer electronics calibration requiring stable component supply despite its obsolete status.

Supply support for AD7576JP 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 ICs.

The AD7576JP belongs to the AD757x family of low-cost, µP-compatible 8-bit ADCs designed for embedded data acquisition where integration, single-supply operation, and ease of microprocessor interfacing are critical.

FAQ

What is the maximum sampling rate achievable with the AD7576JP?

The AD7576JP has a guaranteed 10 µs conversion time, supporting a theoretical maximum sampling rate of 100 kSPS. In practice, system-level timing for CS assertion, RD strobing, and data readout limits sustained throughput to approximately 50–70 kSPS depending on microprocessor bus speed and interface timing margins. The AD7576JP does not include automatic sequencing or FIFO, so each conversion requires explicit software control.

Does the AD7576JP require an external clock source?

No, the AD7576JP includes an on-chip clock generator and requires no external clock components. Internal oscillator frequency is fixed and optimized for 10 µs conversion time. External clocking is neither supported nor necessary - the AD7576JP starts conversion automatically upon CS and RD signal coordination, making it simpler to integrate than clock-dependent ADCs like the AD7574JN.

Can the AD7576JP operate with a bipolar input range?

Yes, the AD7576JP supports bipolar input configurations using external resistor networks connected to IN+ and IN– pins. With VREF set to 5 V and appropriate scaling, it can digitize ±2.5 V inputs. However, the device itself is unipolar-native; bipolar operation relies on external hardware and does not change the internal 0–VREF transfer function. The AD7576JP datasheet provides standard resistor values for common bipolar ranges.

What is the purpose of separate AGND and DGND pins on the AD7576JP?

The AD7576JP uses separate analog ground (AGND) and digital ground (DGND) pins to minimize noise coupling from digital switching transients into the sensitive analog conversion circuitry. Proper PCB layout requires connecting AGND and DGND at a single point near the device, typically at the power supply filter capacitor. This separation preserves 8-bit accuracy and prevents code transitions from being corrupted by digital I/O activity - a key design requirement confirmed in AD7576JP application notes.

Is the AD7576JP pin-compatible with other members of the AD757x family?

No, the AD7576JP is not pin-compatible with other AD757x variants. While AD7576AQ and AD7576BQ share the same 18-pin CERDIP package and pinout, the AD7576JP uses a 20-pin PLCC package with different pin assignments - notably adding dedicated IN– and expanded data/control signal routing. Substituting AD7576JP for AD7576AQ requires PCB redesign. Always verify package-specific pinout before replacement.