Analog Devices Inc. AD7875KPZ-REEL

Overview

AD7875KPZ-REEL from Analog Devices is a complete monolithic 12-bit successive approximation ADC with integrated track-and-hold amplifier, laser-trimmed internal clock, and on-chip 3 V buried Zener reference. It supports unipolar 0 V to +5 V analog input range, delivers 72 dB SNR at 10 kHz, achieves 8 μs conversion time with external 2.5 MHz clock, and features 57 ns data access time for direct interfacing with 8-/16-bit microprocessors in data acquisition systems.

For engineers reviewing the AD7875KPZ-REEL datasheet, AD7875KPZ-REEL pinout, AD7875KPZ-REEL application, or AD7875KPZ-REEL equivalent, this page provides verified technical context, package-specific pin functions, real-world interface timing constraints, dynamic performance limits under specified conditions, and validated alternative options for unipolar 12-bit sampling ADC replacement.

Technical Context

The AD7875KPZ-REEL implements a SAR architecture with internal 3 V reference and 2 μs track-and-hold acquisition, enabling full-scale conversion of up to 50 kHz input signals while maintaining 12-bit linearity. Its internal clock is laser-trimmed to ±0.5% accuracy, eliminating external timing components unless overridden by an external 2.5 MHz TTL-compatible source.

It supports three digital output formats-12-bit parallel, two 8-bit bytes, or serial-via configurable pins (12/8/CLK, HBEN, SSTRB, SCLK, SDATA), with mode selection determined by voltage level on 12/8/CLK (−5 V, 0 V, or +5 V). BUSY/INT and CONVST provide asynchronous control for standalone or processor-synchronized operation.

Key Specifications

Pinout & Package

AD7875KPZ-REEL is housed in a 28-pin plastic leaded chip carrier (PLCC) package with 1.27 mm pitch, JEDEC MS-026AC compliant, and RoHS-compliant matte tin lead finish. Pin 1 identifier located at top-left corner of package marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit unipolar sampling ADC applications.

Compared with AD7875KPZ-REEL, AD7870KPZ-REEL demands analog signal recentering for unipolar use, while ADS7822U reduces component count only when SPI infrastructure exists and system-level reference sharing is feasible.

Availability

AD7875KPZ-REEL is available at Aetrix Electronics and suitable for industrial data acquisition, medical instrumentation, test & measurement equipment, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7875KPZ-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, founded in 1965 and headquartered in Wilmington, MA.

The AD7870/AD7875/AD7876 family was designed specifically for embedded data acquisition systems requiring self-contained, high-accuracy 12-bit conversion without external timing or reference components.

FAQ

What is the guaranteed operating temperature range for AD7875KPZ-REEL?

The AD7875KPZ-REEL is rated for −40°C to +85°C (industrial grade, K/B version). This range is confirmed in Table 2 of the Rev. C datasheet and applies to all DC accuracy and dynamic specifications including SNR, THD, and integral nonlinearity. Operation outside this range may degrade performance or cause permanent damage per Absolute Maximum Ratings.

Does AD7875KPZ-REEL require external clock circuitry?

No. AD7875KPZ-REEL includes a laser-trimmed internal oscillator that guarantees 6.5–9 μs conversion time without external components. An external 2.5 MHz TTL clock may be applied to the CLK pin only if tighter timing control or synchronization with system clock is required; tying CLK to VSS enables the internal clock.

Can AD7875KPZ-REEL interface directly with a 3.3 V microcontroller?

Yes, but with caution: digital inputs (CS, RD, CONVST, 12/8/CLK) accept 0.8 V/2.4 V logic thresholds compatible with 3.3 V CMOS, but outputs (DB[11:0], BUSY/INT) swing to 0.4 V/4.0 V under ±5 V supplies. Level-shifting is required for reliable 3.3 V bus interfacing unless the controller tolerates 5 V-tolerant inputs and open-drain pull-ups.

What is the maximum recommended load capacitance on REF OUT for AD7875KPZ-REEL?

The maximum recommended load capacitance on REF OUT is 50 pF for stable operation. Exceeding this value risks oscillation or reference droop during conversion. If external buffering or scaling is needed (e.g., to generate 5 V), use a 200 Ω series resistor followed by parallel 10 μF tantalum and 0.1 μF ceramic decoupling as specified in Figure 6 of the datasheet.

How does the 12/8/CLK pin configure AD7875KPZ-REEL's output format?

The 12/8/CLK pin selects interface mode: +5 V enables 12-bit parallel only; 0 V enables byte or serial mode with gated SCLK; −5 V enables byte or serial mode with continuous SCLK. This pin must be hard-wired before conversion starts and cannot be changed dynamically during operation without risking invalid data.