Analog Devices Inc. AD7853ARSZ-REEL7

Overview

AD7853ARSZ-REEL7 from Analog Devices is a 12-bit, 200 kSPS pseudo-differential successive approximation register (SAR) ADC operating from a single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, self- and system-calibration, flexible SPI/QSPI/μP-compatible serial interface, and 24-lead SSOP package. It targets precision data acquisition in battery-powered instrumentation and portable medical devices.

For engineers reviewing the AD7853ARSZ-REEL7 datasheet, AD7853ARSZ-REEL7 pinout, AD7853ARSZ-REEL7 application, or AD7853ARSZ-REEL7 equivalent, key selection considerations include its 200 kSPS throughput, ±1 LSB integral nonlinearity at 3 V/5 V, automatic power-down after conversion, and support for unipolar (0 to VREF) and bipolar (±VREF/2) input ranges with external or internal reference.

Technical Context

The AD7853ARSZ-REEL7 implements a charge redistribution SAR architecture with integrated track-and-hold (T/H), internal 2.5 V reference, and calibration memory. Its conversion cycle is synchronized to a 4 MHz master clock (CLKIN), completing in 4.6 µs with 500 ns T/H acquisition time.

It supports five serial interface modes via SM1/SM2 pins, enabling compatibility with 8051, SPI, QSPI, and μP controllers. The POLARITY pin selects SCLK idle state, and SYNC functions as frame sync or chip select depending on mode - all configurable without external logic.

Key Specifications

Pinout & Package

AD7853ARSZ-REEL7 is housed in a 24-lead SSOP (Shrink Small Outline Package) with 0.635 mm lead pitch and exposed pad thermal design. Package dimensions: 8.2 mm × 5.3 mm × 1.75 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7853BR and ADS7822U, AD7853ARSZ-REEL7 uniquely combines SSOP packaging, internal 2.5 V reference, and A-grade ±1 LSB INL - making it optimal for space-constrained, self-contained, production-ready instrumentation where calibration stability and minimal external components are critical.

Availability

AD7853ARSZ-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial process monitoring, and high-speed modem analog front-end applications requiring stable component supply and long-term manufacturability.

Supply support for AD7853ARSZ-REEL7 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 Wilmington, MA.

The AD7853 family was designed for precision, low-power, single-supply data acquisition in portable and embedded systems - emphasizing calibration integrity, serial interface flexibility, and seamless integration with microcontrollers.

FAQ

What is the maximum sampling rate supported by the AD7853ARSZ-REEL7?

The AD7853ARSZ-REEL7 supports a maximum throughput rate of 200 kSPS under standard operating conditions with a 4 MHz master clock (CLKIN). Conversion time is fixed at 4.6 µs, and the device achieves this rate with guaranteed 12-bit accuracy, ±1 LSB integral nonlinearity, and 70 dB SNR + distortion performance. This rate holds across the full –40°C to +85°C temperature range when powered from 3.0 V to 5.5 V supplies.

Does the AD7853ARSZ-REEL7 require external calibration components?

No, the AD7853ARSZ-REEL7 does not require external calibration components for basic operation. It includes on-chip self-calibration and system-calibration logic, and powers up with default settings enabling read-only operation. External 0.1 µF (CREF1) and 0.01 µF (CREF2) capacitors are required for reference decoupling, but no trimming resistors, DACs, or calibration DACs are needed. System calibration can be performed using the CAL pin and internal registers without external hardware.

Can the AD7853ARSZ-REEL7 operate with a 3.3 V supply and still achieve full 12-bit performance?

Yes, the AD7853ARSZ-REEL7 is fully specified for operation from 3.0 V to 5.5 V, including at 3.3 V. At 3.3 V, it maintains 12-bit resolution, ±1 LSB integral nonlinearity, 200 kSPS throughput, and 70 dB SNR + distortion. Power dissipation drops to ~15 mW in normal mode, and sleep current remains at 5 µA with external clock disabled - confirming full specification compliance across the entire voltage range without derating.

What serial interface protocols does the AD7853ARSZ-REEL7 support natively?

The AD7853ARSZ-REEL7 supports five hardware-selectable serial interface modes via SM1/SM2 pins, providing native compatibility with SPI, QSPI, 8051, and generic microprocessor buses. It does not require software bit-banging: SCLK can be externally driven or internally generated, SYNC serves as frame sync or chip select, and POLARITY configures clock idle state. All timing meets SPI Mode 0/3 and QSPI timing requirements per the datasheet's Interface Mode tables.

Is the AD7853ARSZ-REEL7 pin-compatible with the AD7853L series?

No, the AD7853ARSZ-REEL7 is not pin-compatible with AD7853L variants. While both share identical 24-lead SSOP footprints and pin assignments, the AD7853L uses a 1 MHz or 1.8 MHz master clock (vs. 4 MHz for AD7853), resulting in longer conversion time (10 µs vs. 4.6 µs) and different timing margins. Interchanging them without adjusting clock frequency, firmware timing loops, and power-down sequencing will cause functional failure - they are functionally distinct speed grades, not drop-in replacements.