Analog Devices Inc. AD7653ASTZ

Overview

AD7653ASTZ from Analog Devices is a 16-bit, 1 MSPS charge redistribution SAR analog-to-digital converter with integrated 2.5 V reference, unipolar 0 V to 2.5 V input range, no pipeline delay, and dual parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interface - used in high-speed data acquisition systems requiring precision timing and low-latency conversion.

For engineers reviewing the AD7653ASTZ datasheet, AD7653ASTZ pinout, AD7653ASTZ application, or AD7653ASTZ equivalent, this page delivers verified technical context, real-world interface timing behavior, confirmed power scaling across Warp/Normal/Impulse modes, and validated alternative options for instrumentation-grade ADC selection.

Technical Context

The AD7653ASTZ implements a fully self-contained SAR architecture with on-chip error correction, internal conversion clock, and selectable throughput modes: Warp mode achieves 1 µs conversion time (1 MSPS), Normal mode offers 1.25 µs (800 kSPS), and Impulse mode scales power linearly down to 138 µW at 1 kSPS. It operates from a single 5 V supply with separate analog (AVDD/AGND), digital (DVDD/DGND), and I/O (OVDD/OGND) domains.

Its dual-interface design supports 16-bit parallel output with byte-swap and twos-complement/binary format selection, plus serial operation in master or slave configurations using SYNC/SCLK/SDOUT with configurable clock polarity, edge alignment, and frame synchronization - all compatible with 3 V or 5 V logic levels.

Key Specifications

Pinout & Package

AD7653ASTZ is packaged in a 48-lead LQFP (ST-48) with exposed pad option; pin functions are validated per Analog Devices Rev. C datasheet Figure 4 and Table 6. Pin numbering follows top-view layout with AGND pins at positions 1, 36, 41, 42; AVDD at 2 and 44; IN at 43; REF at 37; and SER/PAR at Pin 8.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7653ASTZ, AD7652ASTZ trades integrated reference for lower BOM count flexibility, while AD7654BSTZ adds differential input and dual-channel simultaneity at the cost of higher complexity and no unipolar optimization - making AD7653ASTZ optimal for single-ended, reference-integrated, high-SFDR unipolar measurement tasks.

Availability

AD7653ASTZ is available at Aetrix Electronics and suitable for data acquisition, medical instrumentation, and spectrum analysis applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7653ASTZ 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 AD7653ASTZ belongs to the PulSAR™ family of precision SAR ADCs engineered for high-speed, low-latency, and low-power data conversion in instrumentation, industrial, and medical systems - emphasizing integrated references, flexible interfaces, and robust AC/DC performance.

FAQ

What is the maximum sampling rate of the AD7653ASTZ and under what conditions is it achieved?

The AD7653ASTZ achieves a maximum sampling rate of 1 MSPS in Warp mode, which requires the WARP pin to be HIGH and IMPULSE pin to be LOW. This mode delivers a 1 µs conversion cycle time but mandates a minimum sustained conversion rate to maintain full specified accuracy. The AD7653ASTZ datasheet confirms this behavior in Table 2 and Section "Product Highlights."

Does the AD7653ASTZ include an internal voltage reference, and what is its temperature stability?

Yes, the AD7653ASTZ integrates a 2.5 V internal reference with a typical temperature drift of ±7 ppm/°C over –40°C to +85°C, as specified in Table 2 of the Rev. C datasheet. This reference is enabled by pulling PDREF (Pin 47) LOW and stabilized using a 10 µF capacitor between REF (Pin 37) and REFGND (Pin 38). The AD7653ASTZ maintains ±0.12% FSR full-scale error across temperature when using this reference.

Can the AD7653ASTZ operate from a single 5 V supply, and how are its power domains separated?

Yes, the AD7653ASTZ operates from a single 5 V supply for AVDD and DVDD, while OVDD supports 2.7 V to 5.25 V for I/O compatibility. Its power domains are physically isolated: AVDD/AGND for analog circuitry, DVDD/DGND for digital core, and OVDD/OGND for interface drivers - minimizing noise coupling and enabling clean signal conversion. This separation is explicitly defined in the Absolute Maximum Ratings and Pin Function Descriptions sections of the AD7653ASTZ datasheet.

What interface options does the AD7653ASTZ support, and how is mode selection implemented?

The AD7653ASTZ supports both parallel (16-bit, RD/CS/BUSY-controlled) and serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. Mode selection is controlled by the SER/PAR pin (Pin 8): LOW enables parallel operation with D[0:15] as data outputs; HIGH reconfigures those pins for serial functions including SCLK, SDOUT, and SYNC. Interface behavior, timing, and configuration registers are fully detailed in Sections "Digital Interface," "Parallel Interface," and "Serial Interface" of the AD7653ASTZ datasheet.

How does power consumption scale with throughput in the AD7653ASTZ, and what is the lowest power state?

Power consumption in the AD7653ASTZ scales dynamically with throughput in Impulse mode: it draws 92 mW at 666 kSPS and drops to just 138 µW at 1 kSPS - a >650× reduction - while retaining full 16-bit functionality. This scaling is achieved by gating internal clocks and bias currents proportionally to conversion rate. The AD7653ASTZ datasheet specifies these values in Table 2 under "Power Dissipation without REF" and confirms Impulse mode activation via IMPULSE = HIGH and WARP = LOW.