Analog Devices Inc. AD7575JPZ-REEL

Overview

AD7575JPZ-REEL from Analog Devices is an 8-bit successive approximation analog-to-digital converter (ADC) with integrated track-and-hold, single +5 V supply operation, 5 µs conversion time, ±1 LSB total unadjusted error, and 0 to +70°C temperature range. It digitizes full-scale signals up to 50 kHz (386 mV/µs slew rate) and interfaces directly to 8-bit microprocessors including Z80H, 8085A-2, and TMS32010 via CS/RD control logic.

For engineers reviewing the AD7575JPZ-REEL datasheet, AD7575JPZ-REEL pinout, AD7575JPZ-REEL application, or AD7575JPZ-REEL equivalent, key selection considerations include its LC2MOS process, internal/external clock flexibility, unipolar/bipolar configuration support, 100 ns data access time, and compatibility with memory-mapped or ROM-style microprocessor interfaces.

Technical Context

The AD7575JPZ-REEL implements a SAR architecture with on-chip track-and-hold that acquires input signals on the third falling edge of CLK after CS and RD assertion. Its internal clock generator uses external RCLK/CCLK components, while external 4 MHz CLK yields guaranteed 5 µs conversion with ±1 LSB accuracy.

It supports two interface modes: Slow Memory (WAIT-state driven, BUSY-controlled) and ROM-style (dual-read, non-blocking), both requiring TP pin hard-wired HIGH. Input sampling is deterministic-synchronized to CLK edges-and reference input impedance varies 6–18 kΩ across codes, demanding low-impedance VREF sourcing (e.g., AD589).

Key Specifications

Pinout & Package

AD7575JPZ-REEL is housed in a 20-terminal plastic leaded chip carrier (PLCC) package, pin-compatible with P-20A option per Analog Devices ordering guide. Pin 1 identifier corner is marked with a notch or dot; pins 14 and 15 are NC (no connect).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7575KPZ-REEL, the AD7575JPZ-REEL trades 0.5 LSB linearity for broader availability and lower unit cost; versus MAX1136CPE+, it delivers guaranteed 5 µs performance and eliminates external THS component count-reducing design risk in high-volume industrial controls.

Availability

AD7575JPZ-REEL is available at Aetrix Electronics and suitable for industrial data acquisition, audio digitization, motor control feedback, and legacy microprocessor upgrades requiring stable component supply and long-term obsolescence management.

Supply support for AD7575JPZ-REEL 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 AD7575JPZ-REEL belongs to Analog Devices' legacy high-speed precision ADC family, designed specifically for 8-bit microprocessor-based systems needing integrated track-and-hold, single-supply operation, and deterministic timing in industrial and instrumentation applications.

FAQ

What is the maximum input signal frequency the AD7575JPZ-REEL can accurately digitize?

The AD7575JPZ-REEL supports full-power signal bandwidth up to 50 kHz, corresponding to a 386 mV/µs slew rate-verified for 2.46 V_PP sine waves. This is enabled by its on-chip track-and-hold circuit. Input signals exceeding this slew rate will introduce aperture uncertainty errors. For optimal SNR above 10 kHz, use proper grounding, short analog traces, and ≤2 kΩ source impedance as specified in the AD7575JPZ-REEL application hints.

Does the AD7575JPZ-REEL require external calibration for typical unipolar operation?

No, the AD7575JPZ-REEL does not require external calibration in most unipolar applications due to its ±1 LSB total unadjusted error specification across 0°C to +70°C. Offset and full-scale errors are sufficiently low that systems using a stable 1.23 V reference (e.g., AD589) and proper layout achieve accurate digitization without trimming. Calibration is only necessary if system-level accuracy demands exceed ±1 LSB or if operating outside datasheet conditions (e.g., elevated source impedance).

Can the AD7575JPZ-REEL operate with an internal clock, and what are the trade-offs?

Yes, the AD7575JPZ-REEL supports internal clocking using external RCLK (100 kΩ) and CCLK (100 pF). However, internal clock frequency varies ±50% across units and temperature-resulting in conversion times from ~5 µs to 15 µs. For guaranteed 5 µs timing and consistent software timing margins, Analog Devices recommends using a 4 MHz external clock. Internal clock is suitable only for non-critical timing applications where ±50% conversion time variation is acceptable.

How should the TP pin be handled in a production AD7575JPZ-REEL design?

The TP (test pin) on the AD7575JPZ-REEL must be hard-wired to a logic HIGH level (e.g., tied to VDD through a 10 kΩ resistor) for correct operation. It is not intended for signal routing, feedthrough vias, or connection to other nets. Leaving TP floating or pulling it LOW may cause undefined behavior or conversion failure. This requirement applies universally across all AD7575JPZ-REEL units and is independent of interface mode (Slow Memory or ROM).

Is the AD7575JPZ-REEL compatible with modern microcontrollers like ARM Cortex-M series?

The AD7575JPZ-REEL was designed for 8-bit microprocessors (Z80H, 8085A-2, 6502), but can interface with modern microcontrollers via GPIO bit-banging of CS/RD and polling of BUSY-though this consumes significant CPU cycles. Its 100 ns data access time and 5 µs conversion are easily met by Cortex-M clocks, but native peripheral support (e.g., SPI) is absent. For new designs, consider newer ADCs with SPI/I²C; for legacy replacement or cost-constrained retrofits, AD7575JPZ-REEL remains viable with appropriate software abstraction.