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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7634BSTZ

Name: AD7634BSTZ
Brand: Analog Devices Inc.
SKU: AD7634BSTZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7634BSTZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 48-LQFP

Datasheet:: AD7634BSTZ.pdf

Description:: IC ADC 18BIT SAR 48LQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD7634BSTZ from Analog Devices is an 18-bit, 670 kSPS differential successive approximation register (SAR) ADC with programmable input ranges (±10 V, ±5 V, 0–10 V, 0–5 V), internal 5 V reference (3 ppm/°C drift), and dual parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. It delivers 102.5 dB dynamic range and −112 dB THD at 2 kHz for high-fidelity data acquisition in CT scanners and spectrum analyzers.

For engineers reviewing the AD7634BSTZ datasheet, AD7634BSTZ pinout, AD7634BSTZ application, or AD7634BSTZ equivalent, this page provides verified specifications, interface mode mapping, real-world use cases, and validated alternative options - all grounded in the Rev. B datasheet and Analog Devices' official documentation.

Technical Context

The AD7634BSTZ implements a charge redistribution SAR architecture with no pipeline delay, enabling deterministic conversion timing and true 18-bit no-missing-codes performance. Its iCMOS process supports ±15 V analog supply rails (VCC/VEE) alongside 5 V digital supplies (AVDD/DVDD/OVDD), allowing direct interfacing with industrial bipolar signal chains.

Hardware- and software-configurable operation includes three sampling modes (warp/normal/impulse), four input ranges selected via MODE[1:0], TEN, and BIPOLAR pins, and flexible interface width (18-/16-/8-bit parallel or serial). The dedicated serial configuration port enables runtime reconfiguration of range and mode without reset.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit with guaranteed no missing codes - ensures monotonicity and precision across full-scale range in medical and test equipment.
Throughput Rate	670 kSPS in warp mode - enables real-time capture of fast transients in CT scanner front-ends and high-speed DAQ systems.
INL	±2.5 LSB max (±9.5 ppm FSR) - supports <0.01% linearity error in precision instrumentation and calibration-grade measurements.
Dynamic Range	102.5 dB - allows detection of signals >100,000:1 amplitude ratio, critical for spectrum analysis and low-level signal recovery.
SNR / THD	101 dB SNR and −112 dB THD at 2 kHz - meets stringent AC performance requirements for audio test, vibration analysis, and medical imaging.
Reference	Internal 5 V reference with ±3 ppm/°C drift and TEMP output - eliminates external reference cost while enabling on-chip temperature monitoring.
Interface	Parallel (18-/16-/8-bit) and SPI/QSPI/MICROWIRE/DSP-compatible serial - supports legacy microprocessor buses and modern FPGA-based controllers.
Supply Rails	AVDD/DVDD = 4.75–5.25 V; OVDD = 2.7–5.25 V; VCC = +7 to +15.75 V; VEE = −15.75 to 0 V - accommodates wide analog input voltage ranges including ±10 V.

Pinout & Package

AD7634BSTZ is housed in a Pb-free 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed pad (not electrically required but recommended for thermal performance). Pin functions are mode-dependent: MODE[1:0] selects interface width; TEN/BIPOLAR configure input range; WARP/IMPULSE set sampling mode; and CS/RD control data access timing.

Pin/Terminal	Circuit Role	Design Meaning
IN+, IN−	Differential analog inputs	Accept fully differential signals up to ±10 V; common-mode range depends on selected input range (e.g., 0 V for bipolar modes).
CNVST	Conversion start trigger	Falling edge initiates sampling; defines aperture point with 2 ns delay and 5 ps rms jitter for precise timing control.
BUSY	Conversion status indicator	Active-high pulse indicates ongoing conversion; falling edge signals valid data ready for readout in parallel or serial modes.
CS, RD	Parallel/serial bus enable	Both low to enable output drivers; supports multiplexed bus sharing and handshaking in microprocessor interfaces.
MODE[1:0]	Interface width select	Selects 18-bit (00), 16-bit (01), 8-bit (10), or serial (11) mode - determines D[17:0] usage and pin function multiplexing.
TEN, BIPOLAR	Input range configuration	Combination selects 0–5 V, 0–10 V, ±5 V, or ±10 V full-scale - sets internal gain and offset calibration coefficients.
WARP, IMPULSE	Sampling mode control	WARP = high/low + IMPULSE = low/high selects warp (1.49 μs cycle), normal (1.75 μs), or impulse (2.22 μs) throughput modes.
REF, REFGND	Reference voltage terminals	Support internal 5 V reference (PDREF = low) or external 4.75–5.25 V source; REFGND must tie to AGND for accuracy.

Key Features

Feature	Design Value
Programmable input ranges	Four hardware-selectable ranges (±10 V, ±5 V, 0–10 V, 0–5 V) eliminate external signal conditioning for multi-range systems.
No pipeline delay SAR architecture	Deterministic 1.49 μs conversion time in warp mode enables synchronous sampling and real-time control loop closure.
Dual parallel/serial interface	18-/16-/8-bit parallel bus + SPI/QSPI/MICROWIRE compatibility allows drop-in replacement in legacy 8080-style systems or integration with modern SoCs/FPGAs.
iCMOS high-voltage process	Supports ±15 V analog supplies (VCC/VEE) while maintaining 5 V logic compatibility - simplifies isolated front-end design in industrial DAQ.
Internal reference with TEMP output	5 V reference (±3 ppm/°C drift) plus integrated temperature sensor (311 mV @ 25°C, 1 mV/°C) reduces BOM count and enables self-calibration.
Three operating modes	Warp (670 kSPS), normal (570 kSPS), impulse (450 kSPS) allow trade-off between speed, power (10 mW @ 1 kSPS), and noise performance.

Applications

CT Scanners	Spectrum Analysis
Use Scenario: Digitizing X-ray detector outputs with high dynamic range and low distortion to reconstruct tomographic images. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential current-to-voltage converter outputs at up to 670 kSPS with 102.5 dB dynamic range. Use Value: Enables detection of low-contrast anatomical features via 18-bit resolution and −112 dB THD, reducing dose requirements without sacrificing image fidelity.	Use Scenario: Capturing RF or audio band signals for FFT-based spectral decomposition in test equipment and EMI receivers. IC Role / Device Role / Timing Role: High-linearity ADC front-end with 101 dB SNR and 45 MHz −3 dB input bandwidth feeding FPGA-based FFT engines. Use Value: Delivers clean spectral bins down to −113 dBc SFDR, minimizing false peaks and enabling accurate harmonic and intermodulation analysis.
Medical Instrumentation	Process Control Systems
Use Scenario: High-precision analog input module in patient monitors and electrophysiology recorders requiring stable DC accuracy and low noise. IC Role / Device Role / Timing Role: Bipolar-input ADC with ±5 V range, ±2.5 LSB INL, and internal reference supporting calibrated voltage/current measurement channels. Use Value: Eliminates need for external precision reference and trimming, achieving <0.01% full-scale error over −40°C to +85°C with ±0.5 ppm/°C drift compensation.	Use Scenario: Analog input card in PLCs and DCS systems acquiring sensor signals (thermocouples, strain gauges) across harsh industrial environments. IC Role / Device Role / Timing Role: Robust ADC with ±15 V analog supply tolerance, 75 dB CMRR at 100 kHz, and configurable impulse mode for low-power periodic sampling. Use Value: Maintains accuracy despite ground shifts and noise coupling; 10 mW impulse mode operation extends uptime in battery-backed or energy-harvested modules.

CT Scanners

Spectrum Analysis

Use Scenario: Digitizing X-ray detector outputs with high dynamic range and low distortion to reconstruct tomographic images.

IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential current-to-voltage converter outputs at up to 670 kSPS with 102.5 dB dynamic range.

Use Value: Enables detection of low-contrast anatomical features via 18-bit resolution and −112 dB THD, reducing dose requirements without sacrificing image fidelity.

Use Scenario: Capturing RF or audio band signals for FFT-based spectral decomposition in test equipment and EMI receivers.

IC Role / Device Role / Timing Role: High-linearity ADC front-end with 101 dB SNR and 45 MHz −3 dB input bandwidth feeding FPGA-based FFT engines.

Use Value: Delivers clean spectral bins down to −113 dBc SFDR, minimizing false peaks and enabling accurate harmonic and intermodulation analysis.

Medical Instrumentation

Process Control Systems

Use Scenario: High-precision analog input module in patient monitors and electrophysiology recorders requiring stable DC accuracy and low noise.

IC Role / Device Role / Timing Role: Bipolar-input ADC with ±5 V range, ±2.5 LSB INL, and internal reference supporting calibrated voltage/current measurement channels.

Use Value: Eliminates need for external precision reference and trimming, achieving <0.01% full-scale error over −40°C to +85°C with ±0.5 ppm/°C drift compensation.

Use Scenario: Analog input card in PLCs and DCS systems acquiring sensor signals (thermocouples, strain gauges) across harsh industrial environments.

IC Role / Device Role / Timing Role: Robust ADC with ±15 V analog supply tolerance, 75 dB CMRR at 100 kHz, and configurable impulse mode for low-power periodic sampling.

Use Value: Maintains accuracy despite ground shifts and noise coupling; 10 mW impulse mode operation extends uptime in battery-backed or energy-harvested modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7631BSTZ	18-bit, 625 kSPS, ±10 V range only; no 0–5 V/0–10 V unipolar support; lacks internal TEMP output.	Best suited for fixed-range bipolar systems where range flexibility and on-die temperature sensing are unnecessary.	Select AD7631BSTZ when system uses only ±10 V sensors and board space is constrained - same 48-lead LQFP footprint.
AD7674ASTZ	18-bit, 450 kSPS, unipolar-only (0–5 V/0–10 V); no bipolar input capability; higher power (250 mW @ 450 kSPS).	Targeted at unipolar sensor interfaces (e.g., pressure transducers) where bipolar operation is not required.	Choose AD7674ASTZ for cost-sensitive unipolar DAQ designs needing lower throughput but higher channel density per controller.

Compared with AD7634BSTZ, AD7631BSTZ offers identical bipolar performance but sacrifices input range flexibility and temperature monitoring, while AD7674ASTZ trades bipolar capability and power efficiency for unipolar simplicity - making AD7634BSTZ the optimal choice for mixed-range, thermally aware, and power-constrained high-dynamic applications.

Availability

AD7634BSTZ is available at Aetrix Electronics and suitable for CT scanners, spectrum analyzers, medical instrumentation, and process control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for FDA-regulated or industrial safety-critical designs.

Supply support for AD7634BSTZ 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, with R&D and manufacturing operations worldwide.

The AD7634BSTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-dynamic-range, low-latency data acquisition in medical imaging, test equipment, and industrial automation where accuracy, speed, and configurability are critical.

FAQ

What input voltage ranges does the AD7634BSTZ support, and how are they selected?

The AD7634BSTZ supports four differential input ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. Selection is performed using the TEN and BIPOLAR pins - for example, TEN = low and BIPOLAR = low configures the 0 V to 5 V range. These pins directly control internal gain and offset calibration, and the setting persists across conversions without software intervention. All ranges maintain 18-bit resolution and specified INL performance per the AD7634BSTZ datasheet Rev. B.

Does the AD7634BSTZ require an external reference, or can it operate with its internal reference?

The AD7634BSTZ can operate with its internal 5 V reference (enabled by pulling PDREF low), which exhibits ±3 ppm/°C drift and includes a dedicated TEMP output for on-chip temperature monitoring. Alternatively, an external reference between 4.75 V and 5.25 V may be applied to the REF pin with PDREF high. The internal reference eliminates BOM cost and layout complexity in space-constrained designs, while the external option supports tighter drift or custom voltage requirements - both configurations are fully supported in the AD7634BSTZ specification.

How does the AD7634BSTZ handle interface mode selection, and what are the pin mappings for parallel vs. serial operation?

Interface mode is selected via MODE[1:0]: 00 = 18-bit parallel, 01 = 16-bit parallel, 10 = 8-bit parallel, and 11 = serial. In parallel modes, D[17:0] serve as data outputs; in serial mode, those pins become SDOUT, SDCLK, SYNC, SCIN, SCCLK, SCCS, etc., as defined in Table 6 of the AD7634BSTZ datasheet. The OB/2C pin controls output coding (straight binary vs. two's complement), and CS/RD coordinate read timing - ensuring seamless integration across microprocessor, DSP, and FPGA platforms without redesign.

What are the power consumption characteristics of the AD7634BSTZ across its three operating modes?

The AD7634BSTZ offers scalable power: 195–225 mW in warp mode (670 kSPS), 175–205 mW in normal mode (570 kSPS), and as low as 10 mW in impulse mode (450 kSPS) when clocked at 1 kSPS. Power-down mode reduces consumption to 10 μW. These values assume internal reference enabled (PDREF = low) and reflect actual measured dissipation per Table 2. This granular control allows system designers to optimize thermal budget and battery life in portable or fanless medical and industrial equipment using the AD7634BSTZ.

Is the AD7634BSTZ pin-compatible with other devices in the PulSAR® family, such as the AD7631BSTZ?

Yes - the AD7634BSTZ shares the same 48-lead LQFP package and pinout as the AD7631BSTZ, enabling mechanical drop-in replacement. However, functional differences exist: AD7631BSTZ supports only ±10 V and ±5 V ranges (no unipolar options) and lacks the TEMP output and some serial configuration features. While PCB layout remains unchanged, firmware and range configuration logic must be verified for compatibility before substitution in production systems using the AD7634BSTZ.

AD7634BSTZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: iCMOS®, PulSAR®

Package/Case:: 48-LQFP

Packaging:: Tray

Product Status:: Active

Number of Bits:: 18

Sampling Rate (Per Second):: 670k

Number of Inputs:: 1

Input Type:: Differential

Data Interface:: SPI, Parallel, DSP

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External, Internal

Voltage - Supply, Analog:: 5V

Voltage - Supply, Digital:: 5V

Features:: -

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 48-LQFP (7x7)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7634BSTZ FAQ

1.How can I place an order for AD7634BSTZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7634BSTZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD7634BSTZ reliable?

The price and inventory of AD7634BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7634BSTZ is usually 5 days.

3.What payment methods are accepted for AD7634BSTZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7634BSTZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7634BSTZ?

AD7634BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7634BSTZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD7634BSTZ?

For technical support, including AD7634BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7634BSTZ requirements.

6.How does Aetrix verify that AD7634BSTZ is sourced from the original manufacturer or authorized distributors?

All AD7634BSTZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7634BSTZ meets industry standards.

7.What is the process for return or replacement of AD7634BSTZ?

All AD7634BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7634BSTZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD7634BSTZ part is unused and in its original packaging.

Return procedure for AD7634BSTZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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