Analog Devices Inc. AD7895ARZ-10

Overview

AD7895ARZ-10 from Analog Devices is a 12-bit successive-approximation ADC with ±10 V analog input range, 3.8 µs conversion time in high-sampling mode, single +5 V supply operation, and integrated track/hold amplifier - used for precision data acquisition in industrial sensor interfaces and automated test equipment.

For engineers reviewing the AD7895ARZ-10 datasheet, AD7895ARZ-10 pinout, AD7895ARZ-10 application, or AD7895ARZ-10 equivalent, key selection criteria include bipolar input range support, serial two-wire interface timing (15 MHz SCLK max), 70 dB SNR at 50 kHz, on-chip reference buffering, and automatic power-down mode for low-power embedded systems.

Technical Context

The AD7895ARZ-10 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with signal scaling circuitry enabling ±10 V full-scale input while operating from +5 V only. Its track/hold acquisition time is 0.5 µs, and aperture delay is 15 ns.

It supports two operating modes: Mode 1 (high-speed, 3.8 µs conversion) and Mode 2 (auto-sleep, 9.8 µs total wake-up + conversion), both using edge-triggered CONVST and falling-edge–synchronized SDATA output with four leading zeros followed by 12-bit 2's complement data.

Key Specifications

Pinout & Package

AD7895ARZ-10 is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, 5.0 mm × 6.2 mm body, and standard JEDEC MS-012 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7895ARZ-10, AD7895BRZ-10 offers identical functionality at lower cost for less demanding linearity budgets, while AD7495ARMZ trades bipolar input capability for higher speed and SPI compatibility - neither is pin- or functionally compatible without hardware redesign.

Availability

AD7895ARZ-10 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable data loggers, and motor drive current sensing requiring stable component supply across long-lifecycle programs.

Supply support for AD7895ARZ-10 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 AD7895 product line delivers compact, low-power, serial-output ADCs optimized for space-constrained industrial and instrumentation systems requiring ±10 V, ±2.5 V, or 0–2.5 V input ranges without external signal conditioning.

FAQ

What is the maximum sampling rate achievable with the AD7895ARZ-10?

The AD7895ARZ-10 achieves up to 192 kSPS in Mode 1 (high-sampling) operation. This requires 3.8 µs conversion time, 1.1 µs serial read (at 15 MHz SCLK), and ≥300 ns track/hold acquisition before the next CONVST edge - totaling 5.2 µs minimum cycle time. The AD7895ARZ-10 must be operated within these timing constraints to maintain specified SNR and linearity performance.

Does the AD7895ARZ-10 require an external reference voltage?

Yes, the AD7895ARZ-10 requires an external +2.5 V reference applied to the REF IN pin. It features on-chip buffering with ≤1 µA input current and 10 pF input capacitance. Precision references such as the AD780 or AD680 are recommended to maintain the specified ±1 LSB linearity and 70 dB SNR. The AD7895ARZ-10 does not include an internal reference.

How does the auto power-down mode work on the AD7895ARZ-10?

In auto power-down mode (Mode 2), the AD7895ARZ-10 enters low-power sleep after conversion completes (BUSY goes low), reducing IDD to 5 µA max. It "wakes up" on the rising edge of CONVST, with 6 µs wake-up time before track/hold enters hold mode. This mode cuts average power significantly in low-duty-cycle applications - critical for battery-powered AD7895ARZ-10 deployments.

What is the output coding format of the AD7895ARZ-10?

The AD7895ARZ-10 outputs data in 2's complement binary format, appropriate for its ±10 V bipolar input range. Serial output consists of 16 bits: four leading zeros followed by the 12-bit conversion result. This coding allows direct interpretation of negative values without software sign extension - a key feature distinguishing AD7895ARZ-10 from unipolar variants like AD7895-2.

Can the AD7895ARZ-10 interface directly with a microcontroller GPIO without level-shifting?

Yes, the AD7895ARZ-10 is fully compatible with 5 V-tolerant microcontroller GPIOs: VDD = +5 V ±5%, VINH = 2.4 V min, VINL = 0.8 V max, VOH = 4.0 V min (at 200 µA), and VOL = 0.4 V max (at 1.6 mA). Its logic thresholds and drive strength align with standard 5 V CMOS interfaces, eliminating need for level shifters when connecting to legacy or industrial MCUs.