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AD9221ARSZ-REEL

12-bit 1.25MSPS ADC, 5V, 72dB SNR, SSOP-28

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Manufacturer Part：

AD9221ARSZ-REEL

Package：

28-Pin SSOP (RS) (10.2 x 5.3 x 2.0 mm)

Brand：

Product Categories：

Analog Linear ICs, Integrated Circuits ICs

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Description

Product Overview

The AD9221ARSZ-REEL is an Analog Devices 12-bit 1.25 MSPS ADC with single-supply 5V operation, 72dB SNR, and 250mW power consumption. Packaged in 28-pin SSOP, -40°C to +85°C, tape-and-reel.

Key Specifications

Resolution	12 bits
Sample Rate	1.25 MSPS
SNR	72 dB
Supply	5 V single
Power	250 mW
Package	28-Pin SSOP (RS)

Features

12-bit resolution at 1.25MSPS
Single 5V supply operation
72dB SNR performance
On-chip reference and track/hold
Parallel CMOS output data
280MHz full-power bandwidth

Applications

Medical imaging
Instrumentation and measurement
Communications receivers
Industrial data acquisition

Product Introduction:AD9221ARSZ-REEL Product Introduction

The AD9221ARSZ-REEL is an Analog Devices 12-bit 1.25 million samples per second (MSPS) analog-to-digital converter in a 28-pin SSOP (RS) package with tape-and-reel packaging. The device operates from a single 5V supply and consumes 250mW, providing an efficient solution for medium-speed data acquisition. The 72dB signal-to-noise ratio delivers 11.5 effective bits of performance at the rated sampling frequency. The on-chip track-and-hold amplifier has a 280MHz full-power bandwidth, allowing direct digitization of wideband signals. The internal 2.5V reference with ±0.5% initial accuracy simplifies external circuit design. The parallel CMOS output interface provides 12-bit data with standard digital timing for easy interfacing to DSPs, FPGAs, and microcontrollers. The AD9221 uses a multi-stage pipelined architecture that achieves 1.25MSPS throughput with moderate power consumption. The REEL suffix denotes tape-and-reel packaging for automated assembly.

Working Principle:AD9221ARSZ-REEL Working Principle

The AD9221 uses a multi-stage pipelined architecture consisting of four 3-bit stages followed by a 4-bit flash ADC. Each pipeline stage performs a coarse quantization, converts the digital code back to analog with an internal DAC, subtracts this from the held input, amplifies the residue, and passes it to the next stage. The digital outputs from all stages are combined and error-corrected using redundant bits (1-bit overlap between stages) to produce the final 12-bit output. The pipelined architecture achieves high throughput because each stage processes a different sample simultaneously, like an assembly line. The 280MHz track-and-hold amplifier samples the input at the rising edge of the encode clock. The on-chip reference provides the 2.5V voltage that defines the ADC input range (0 to 2V or 0 to 5V with external scaling). The 250mW power consumption is primarily in the analog pipeline stages and the internal reference buffer.

Pin Description:AD9221ARSZ-REEL Pin Definition and Functions

Pin Group	Count	Description
D0-D11	12	Parallel data output bits
AVDD	3	Analog 5V supply
DVDD	2	Digital 5V supply
AGND	3	Analog ground
DGND	2	Digital ground
VIN	1	Analog input
REF	1	Reference output/input
CLK	1	Encode clock
OTR	1	Out-of-range flag

Application Scenarios:In which products and applications isAD9221ARSZ-REEL used

Medical ultrasound beamforming with 12-bit 1.25MSPS per channel and 280MHz analog bandwidth
Industrial vibration monitoring ADC with 72dB SNR for FFT-based fault detection
Communications IF sampling receiver with 1.25MSPS throughput and 5V compatibility
Instrumentation data acquisition with on-chip reference and parallel CMOS interface to FPGA

Alternative Models:What chips are recommended as replacements for AD9221ARSZ-REEL

Model	Manufacturer	Key Difference
AD9220ARSZ	ADI	10-bit, 1MSPS version
AD9223ARSZ	ADI	12-bit, 3MSPS version
ADS7042IRSYR	TI	12-bit, 1MSPS, SOT-23-6
MCP33131D-10-E/MN	Microchip	12-bit, 500kSPS, lower power