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Home > Products > Integrated Circuits (ICs) > Linear > Analog Multipliers, Dividers

Analog Devices Inc. AD538SD

Name: AD538SD
Brand: Analog Devices Inc.
SKU: AD538SD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD538SD

Manufacturer:: Analog Devices Inc.

Category:: Analog Multipliers, Dividers

Package:: 18-CDIP (0.300", 7.62mm)

Datasheet:: AD538SD.pdf

Description:: IC MULT/DIV REALTIME ACU 18-CDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD538SD from Analog Devices is a monolithic real-time analog computational unit (ACU) performing precision multiplication, division, and exponentiation with VO = VY(VZ/VX)^m. It delivers ±0.25% of reading total error (100:1 input range), 400 kHz small-signal bandwidth, and operates across −55°C to +125°C. Used in transducer linearization, log-ratio computation, and precision AGC circuits requiring wide dynamic range analog signal processing.

For engineers reviewing the AD538SD datasheet, AD538SD pinout, AD538SD application, or AD538SD equivalent, this page provides verified functional identity, military-grade temperature performance, resistor-programmable exponent (m = 0.2 to 5), on-chip +2 V/+10 V references, and real-time analog computation without external trims.

Technical Context

The AD538SD implements logarithmic ratio computation followed by antilog conversion to realize VO = VY(VZ/VX)^m, using laser-trimmed internal circuitry for high accuracy. Its dual reference outputs (+2 V unbuffered, +10 V buffered) enable scalable voltage-mode operation, while current-input capability (IX/IY/IZ) supports summing junction flexibility.

It features separate signal and power ground pins (Pins 14 and 13), supports ±4.5 V to ±18 V supplies, and achieves 400 kHz bandwidth with ≤±100 µV typical output offset. The device's error specification combines percent-of-reading and fixed offset terms-critical for low-level signal fidelity in wide-dynamic-range applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Transfer Function	VO = VY(VZ/VX)^m; enables simultaneous multiplication, division, and exponentiation in one monolithic stage.
Total Error (100:1 Range)	±0.25% of reading + ±100 µV; ensures high accuracy down to 100 mV inputs without calibration.
Exponent Range (m)	0.2 to 5; programmable via external resistors between Pins A/D (powers) or B/C (roots).
Small-Signal Bandwidth	400 kHz; supports real-time analog computation of fast-varying sensor or control signals.
Operating Temperature	−55°C to +125°C; qualified for military/aerospace systems requiring extended thermal reliability.
Supply Voltage Range	±4.5 V to ±18 V; compatible with standard ±5 V, ±12 V, and ±15 V rails without external regulation.
Voltage References	+10 V buffered (Pin 4), +2 V unbuffered (Pin 5); laser-trimmed to ±15 mV accuracy at 25°C.

Pinout & Package

AD538SD is housed in an 18-lead TO-118 hermetic side-brazed ceramic DIP package, rated for military temperature operation and high-reliability environments.

Pin/Terminal	Circuit Role	Design Meaning
1 IZ	Current input for Z multiplicand	Accepts 0–400 µA; used in current-mode log-ratio computation or summing configurations.
2 VZ	Voltage input for Z multiplicand	Accepts 100 mV–10 V; direct voltage-mode input to log amplifier section.
3 B	Log ratio differential amplifier output	Provides ln(VZ/VX); accessible for standalone log-ratio or external scaling.
4 +10V	+10 V buffered reference output	Low-impedance source for scaling; laser-trimmed to ±15 mV accuracy.
5 +2V	+2 V unbuffered reference output	High-impedance (≈5 kΩ); requires >500 kΩ load for <1% error.
6 +VS	Positive supply rail	Supports ±4.5 V to ±18 V operation; decoupling recommended near Pin 6.
7 –VS	Negative supply rail	Paired with +VS; symmetric supply improves common-mode rejection.
8 VO	Analog output voltage	Delivers ±11 V swing into 2 kΩ; low-offset design minimizes DC error accumulation.
9 I	Current input to output amplifier	Summing node for external signals; enables offset correction or multi-input configurations.
10 VY	Voltage input for Y multiplicand	Scales final result; tied to reference for fixed-gain multiplication/division.
11 IY	Current input for Y multiplicand	Alternative Y-path for current-mode operation; matches IX/IZ characteristics.
12 C	Antilog converter base input	Receives log-ratio output (B) or externally scaled signal; determines exponentiation gain.
13 PWR GND	Power return for high-current sections	Separate from signal ground to minimize supply-induced noise coupling.
14 SIGNAL GND	Low-level analog reference return	Isolates sensitive input/output stages from digital or switching noise.
15 VX	Voltage input for X multiplicand (denominator)	Defines division denominator; 100 mV–10 V range enables wide dynamic ratio computation.
16 IX	Current input for X multiplicand	Matches IZ/IY; supports current-mode denominator input with same accuracy.
17 D	Log ratio function terminal	Used with Pin A to set exponent m > 1 via external resistor (e.g., 48.7 Ω for m = 5).
18 A	Log ratio function terminal	Paired with Pin D for gain programming; forms part of resistor network defining m value.

Key Features

Feature	Design Value
Resistor-programmable exponent (m)	Set m = 0.2 to 5 using two external resistors-no DACs or digital control required.
No external trims required	Laser wafer trimming achieves ±0.25% reading error out-of-box; eliminates production calibration.
On-chip dual voltage references	+2 V (unbuffered) and +10 V (buffered) references provide stable scaling without external ICs.
Wide input dynamic range	1000:1 (10 mV to 10 V) denominator range enables accurate division even with low-level inputs.
Monolithic construction	Single-die integration replaces hybrid modules-higher reliability, lower cost, and smaller footprint.

Applications

Transducer Linearization	Log Ratio Computation
Use Scenario: Correcting nonlinear output of RTDs, thermistors, or pressure sensors in aerospace telemetry systems. IC Role / Device Role / Timing Role: Real-time analog computation block performing piecewise power-series approximation via VO = VY(VZ/VX)^m. Use Value: Eliminates need for digital lookup tables or microcontroller-based correction-reduces latency and firmware complexity.	Use Scenario: Computing pH ratio or gas concentration ratios in environmental monitoring analyzers. IC Role / Device Role / Timing Role: Dedicated log-ratio engine using Pins B and C to output ln(VZ/VX) with ±0.5% domain accuracy. Use Value: Achieves three-decade input range (10 mV–10 V) with no external op amps-reducing component count and board space.
Precision AGC Loops	Trigonometric Approximation
Use Scenario: Maintaining constant RF signal amplitude in military radar receivers under varying antenna coupling. IC Role / Device Role / Timing Role: Analog divider core computing gain factor as VO = 10 V × (VZ/VX) with 400 kHz bandwidth. Use Value: Enables closed-loop response faster than DSP-based AGC-critical for pulsed RF systems with microsecond settling.	Use Scenario: Generating sine/cosine approximations in analog flight control computers where FPGAs are prohibited. IC Role / Device Role / Timing Role: Exponentiation unit implementing arcsin(x) ≈ x + x³/6 via m = 3 configuration on VZ/VX path. Use Value: Provides deterministic, radiation-tolerant trigonometric functions without clock jitter or software interrupts.

Transducer Linearization

Log Ratio Computation

Use Scenario: Correcting nonlinear output of RTDs, thermistors, or pressure sensors in aerospace telemetry systems.

IC Role / Device Role / Timing Role: Real-time analog computation block performing piecewise power-series approximation via VO = VY(VZ/VX)^m.

Use Value: Eliminates need for digital lookup tables or microcontroller-based correction-reduces latency and firmware complexity.

Use Scenario: Computing pH ratio or gas concentration ratios in environmental monitoring analyzers.

IC Role / Device Role / Timing Role: Dedicated log-ratio engine using Pins B and C to output ln(VZ/VX) with ±0.5% domain accuracy.

Use Value: Achieves three-decade input range (10 mV–10 V) with no external op amps-reducing component count and board space.

Precision AGC Loops

Trigonometric Approximation

Use Scenario: Maintaining constant RF signal amplitude in military radar receivers under varying antenna coupling.

IC Role / Device Role / Timing Role: Analog divider core computing gain factor as VO = 10 V × (VZ/VX) with 400 kHz bandwidth.

Use Value: Enables closed-loop response faster than DSP-based AGC-critical for pulsed RF systems with microsecond settling.

Use Scenario: Generating sine/cosine approximations in analog flight control computers where FPGAs are prohibited.

IC Role / Device Role / Timing Role: Exponentiation unit implementing arcsin(x) ≈ x + x³/6 via m = 3 configuration on VZ/VX path.

Use Value: Provides deterministic, radiation-tolerant trigonometric functions without clock jitter or software interrupts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog computational unit applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD538BD	Industrial grade (−25°C to +85°C); ±0.5% reading error vs. AD538SD's ±0.25%.	Not qualified for military temperature range; unsuitable for embedded avionics or space-qualified designs.	Select AD538BD only when full military temp range and highest accuracy are not required.
MPY100KG	Discrete multiplier IC; no built-in division/log-ratio function; requires external op amps for VO = VY(VZ/VX).	Lacks monolithic log/antilog architecture-adds 3+ components and layout sensitivity for same function.	Choose MPY100KG only if single-quadrant multiplication dominates and division is handled digitally.

Compared with AD538BD and MPY100KG, the AD538SD uniquely integrates military-temperature-rated division, exponentiation, and dual references in one hermetic package-enabling compact, high-reliability analog computation without external support circuitry.

Availability

AD538SD is available at Aetrix Electronics and suitable for aerospace telemetry, military radar AGC, environmental sensor analytics, and avionics transducer conditioning requiring stable component supply across extended temperature extremes.

Supply support for AD538SD 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, defense, and industrial markets since 1965.

The AD538 product line delivers monolithic analog computational units for real-time multiplication, division, and exponentiation-designed specifically for applications demanding wide dynamic range, military temperature operation, and minimal external components.

FAQ

What is the guaranteed accuracy of AD538SD over its full military temperature range?

The AD538SD guarantees ±0.5% of reading + ±350 µV total error across −55°C to +125°C (TMIN to TMAX), as specified in Table 1 of the Rev. E datasheet. This includes both percent-of-reading and offset contributions, validated under 100 mV to 10 V input conditions with m = 1.0. The AD538SD maintains this performance without recalibration or external trimming.

Can AD538SD perform true two-quadrant division with bipolar numerator inputs?

Yes-AD538SD supports two-quadrant division using external level-shifting resistors (e.g., 25 kΩ/35 kΩ network per Figure 14). By offsetting the numerator input VZ relative to VX, the circuit accepts bipolar VZ while maintaining VO = 10 V × (VZ/VX) after offset correction. The AD538SD's wide supply range (±4.5 V to ±18 V) and separate ground pins ensure stability in this configuration.

How is the exponent 'm' programmed on AD538SD, and what resistor values are needed for m = 2?

The exponent m is set by connecting external resistors between Pins A and D (for m > 1) or between Pins B and C (for m < 1). For m = 2, a 196 Ω resistor is placed between Pins A and D, as listed in Figure 16 of the datasheet. This configures the log-ratio amplifier gain to double the ln(VZ/VX) term before antilog conversion, yielding VO = VY(VZ/VX)².

Does AD538SD require external passive components for basic one-quadrant multiplication?

No-AD538SD performs one-quadrant multiplication (VO = VY × VZ/VX) with no external passive components when VX is tied to the +10 V reference (Pin 4) and Pin B is connected to Pin C. The on-chip +2 V and +10 V references, laser-trimmed log/antilog blocks, and matched transistor arrays eliminate the need for external trims, resistors, or op amps in this baseline configuration.

What is the maximum recommended capacitive load on the VO pin of AD538SD?

The AD538SD VO pin drives up to ±11 V into a 2 kΩ load, but capacitive loading above 100 pF risks instability due to phase shift in the multistage signal path, especially at high incremental gains (e.g., VO = VY × VZ/VX with small VX). Per Stability Precautions (Page 10), keep VO trace short, avoid long cables, and use series resistance (≤100 Ω) if driving >100 pF to maintain 400 kHz bandwidth and prevent oscillation.

AD538SD Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 18-CDIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Active

Function:: Analog Computational Unit

Number of Bits/Stages:: 4-Quadrant

Supplier Device Package:: 18-SBDIP

AD538SD FAQ

1.How can I place an order for AD538SD through Aetrix?

Please submit a Request for Quotation (RFQ) for AD538SD 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 AD538SD reliable?

The price and inventory of AD538SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD538SD is usually 5 days.

3.What payment methods are accepted for AD538SD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD538SD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD538SD?

AD538SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD538SD 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 AD538SD?

For technical support, including AD538SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD538SD requirements.

6.How does Aetrix verify that AD538SD is sourced from the original manufacturer or authorized distributors?

All AD538SD 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 AD538SD meets industry standards.

7.What is the process for return or replacement of AD538SD?

All AD538SD units undergo pre-shipment inspection (PSI). If there is an issue with AD538SD, 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 AD538SD part is unused and in its original packaging.

Return procedure for AD538SD:

1.Submit a request within 90 days.

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

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