Analog Devices Inc. AD7853ARZ-REEL

Overview

AD7853ARZ-REEL from Analog Devices is a 12-bit, 200 kSPS successive approximation register (SAR) analog-to-digital converter optimized for speed and single-supply operation at 3 V to 5.5 V. It features pseudo-differential input architecture, on-chip 2.5 V reference, self- and system-calibration, and SPI/QSPI/8051-compatible serial interface. Used in battery-powered instrumentation requiring high throughput and low power, such as portable medical monitors and PDA data acquisition.

For engineers reviewing the AD7853ARZ-REEL datasheet, AD7853ARZ-REEL pinout, AD7853ARZ-REEL application, or AD7853ARZ-REEL equivalent, key selection criteria include conversion rate (200 kSPS), unipolar/bipolar input range support, automatic power-down after conversion (25 mW typical), and compatibility with 3 V microcontroller I/O levels.

Technical Context

The AD7853ARZ-REEL implements a charge redistribution SAR ADC core with integrated track-and-hold (T/H) acquiring in 500 ns. Its internal 2.5 V reference is buffered and available at REFIN/REFOUT, supporting external overdrive from 1.2 V to AVDD. Calibration logic enables on-demand self-calibration (typ. 31.25 ms at 4 MHz CLKIN) and system offset/gain calibration using dedicated CAL and control register bits.

Serial communication operates across five interface modes selected via SM1/SM2 pins, supporting both external clocking (SCLK input) and self-clocking (SCLK output). POLARITY pin configures SCLK idle state, and SYNC serves as frame sync or chip select depending on mode - enabling seamless integration with 8051, SPI, and QSPI host controllers without protocol translation.

Key Specifications

Pinout & Package

AD7853ARZ-REEL is housed in a 24-lead SOIC package (R-24), 0.3-inch wide, RoHS-compliant, tape-and-reel format (REEL suffix). Pin layout supports compact PCB layout with separate AGND/DGND planes and dedicated reference decoupling pins (CREF1, CREF2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7853LARZ-REEL and ADS7822U, the AD7853ARZ-REEL uniquely balances 200 kSPS speed, integrated reference, and on-chip calibration - making it optimal for portable instruments needing verified accuracy without external calibration infrastructure.

Availability

AD7853ARZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial control loop sampling requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7853ARZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7853 product line delivers precision, low-power, single-supply SAR ADCs targeting portable and battery-operated instrumentation where calibration integrity and interface flexibility are critical.

FAQ

What is the maximum sampling rate supported by the AD7853ARZ-REEL?

The AD7853ARZ-REEL supports a maximum throughput rate of 200 kSPS under standard operating conditions (AVDD = DVDD = 3.0 V to 5.5 V, fCLKIN = 4 MHz). This is achieved with a conversion time of 4.6 µs and requires at least 400 ns acquisition time before the next CONVST edge to ensure 12-bit settling. The AD7853ARZ-REEL datasheet specifies this performance across the full industrial temperature range (–40°C to +85°C).

Does the AD7853ARZ-REEL include an internal voltage reference?

Yes, the AD7853ARZ-REEL integrates a 2.5 V reference with ±20 ppm/°C temperature coefficient, accessible at the REFIN/REFOUT pin. This reference can be overdriven by an external source from 1.2 V to AVDD, and supports both unipolar (0 to VREF) and bipolar (±VREF/2) input ranges. External decoupling with 0.1 µF and 0.01 µF capacitors on CREF1 and CREF2 pins is mandatory for specified performance.

How does the AD7853ARZ-REEL handle calibration?

The AD7853ARZ-REEL supports automatic self-calibration on power-up (via 10 nF capacitor on CAL pin) and on-demand system calibration triggered by a rising edge on CAL. It provides dedicated calibration registers for offset and gain adjustment, with allowable spans of ±0.05 × VREF (offset) and +1.025/–0.975 × VREF (gain). Calibration data persists through sleep mode, ensuring accuracy retention without reinitialization.

What serial interface protocols does the AD7853ARZ-REEL support?

The AD7853ARZ-REEL supports five configurable serial interface modes selected via SM1/SM2 pins, enabling native compatibility with SPI Mode 0/3, QSPI, and 8051 microcontrollers. It operates with either external SCLK (input) or self-clocking (SCLK output), and the POLARITY pin controls SCLK idle state. All modes use 16-bit framing and support read-only operation or full read/write access to control and calibration registers.

What power management options are available on the AD7853ARZ-REEL?

The AD7853ARZ-REEL offers three power states: normal mode (12 mW at 3 V), partial power-down (400 µA), and full power-down (5 µA with clock disabled). Power state is controlled via PMGT bits in the control register or directly via the SLEEP pin. In full power-down, the internal reference and all analog circuitry are disabled, yet calibration data remains intact in nonvolatile memory.