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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > V/F and F/V Converters

Analog Devices Inc. AD537SD/883B

Name: AD537SD/883B
Brand: Analog Devices Inc.
SKU: AD537SD/883B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD537SD/883B

Manufacturer:: Analog Devices Inc.

Category:: V/F and F/V Converters

Package:: 14-CDIP (0.300", 7.62mm)

Datasheet:: AD537SD/883B.pdf

Description:: IC V/F CONV 100KHZ 14CDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD537SD/883B from Analog Devices is a military-grade current-to-frequency converter IC with integrated voltage-to-current amplifier, precision 1.00 V reference, and absolute temperature sensor (1 mV/K). It delivers 0 kHz to 150 kHz output frequency, ±5% full-scale calibration error (C = 0.01 µF, I_IN = 1.000 mA), and operates over –55°C to +125°C in a hermetic ceramic DIP package. It is used in high-reliability analog signal conditioning for aerospace telemetry and ruggedized temperature monitoring systems.

For engineers reviewing the AD537SD/883B datasheet, AD537SD/883B pinout, AD537SD/883B application, or AD537SD/883B equivalent, key selection criteria include its guaranteed nonlinearity of 0.1% max at f_MAX = 100 kHz, open-collector output capable of 20 mA sink current, –55°C to +125°C extended temperature range, and dual reference outputs (1.00 V ±5% and 1.00 mV/K) with specified tempcos.

Technical Context

The AD537SD/883B integrates a precision op-amp input stage that converts voltage inputs to a scalable drive current (typically 1 mA full scale) for an adaptive astable multivibrator core. Its current-to-frequency conversion uses an externally timed capacitor (e.g., 0.01 µF for 10 kHz FS) and features an "adaptive bias" scheme enabling low nonlinearity across 0.1 µA–2000 µA input range.

It includes a bandgap-based reference generator delivering two independent outputs: a 1.00 V ±5% reference (50 ppm/°C max) and a Kelvin-proportional V_TEMP output (1.00 mV/K, ±0.02 mV/K slope error). The open-collector output driver supports floating logic common referencing and synchronous operation via SYNC pin (DIP only), with output rise/fall times as low as 0.2 µs at 1 mA input.

Key Specifications

Parameter	Value and Actual Design Meaning
Frequency Range	0 kHz to 150 kHz - full operational bandwidth with confirmed linearity up to 100 kHz (0.1% max nonlinearity).
Nonlinearity (f_MAX = 100 kHz)	0.1% max - deviation from ideal transfer curve after zero/full-scale calibration; enables high-accuracy analog-to-digital conversion without external linearization.
Full-Scale Calibration Error	±5% max (C = 0.01 µF, I_IN = 1.000 mA) - initial gain accuracy before trimming; sufficient for systems with post-conversion digital correction.
Input Bias Current	100 nA - enables high-impedance voltage sensing (e.g., potentiometer wiper interfaces) without significant loading error.
Reference Outputs	1.00 V ±5% (50 ppm/°C max) and 1.00 mV/K (±0.02 mV/K slope error) - stable, calibrated references usable for scaling, offsetting, and absolute temperature measurement.
Supply Voltage Range	Single supply: 4.5 V to 36 V; dual supply: ±5 V to ±18 V - supports wide industrial and avionics power architectures.
Operating Temperature	–55°C to +125°C - qualified per MIL-STD-883 for use in harsh-environment military and space applications.

Pinout & Package

AD537SD/883B is supplied in a 14-lead side-brazed ceramic DIP (TO-116, D-14) package with hermetic sealing and gold-plated leads. Pin 1 is identified by a chamfered corner; the package meets MIL-PRF-38534 Class H requirements.

Pin/Terminal	Circuit Role	Design Meaning
1 (VOS)	Offset Null Input	Connects to external trim pot for input offset voltage adjustment (only functional in "D" package variants like AD537SD/883B).
2 (SYNC)	Synchronization Input	Accepts external square-wave signal (0.8–1.0 V p-p) to lock oscillator frequency; also functions as oscillator disable when shorted to +VS.
3 (IIN)	Current Input	Direct current input node; accepts 0.1 µA to 2000 µA; used for current-source or negative-voltage interface configurations.
4 (–VIN)	Inverting Input	High-impedance inverting input for differential voltage mode; safe input range extends to ±V_S.
5 (VLOGIC)	Logic Common Reference	Defines logic ground level for open-collector output; can be set independently from –V_S, enabling level-shifting interfaces.
6 (VTEMP)	Absolute Temperature Output	1.00 mV/K output referenced to Kelvin; calibrated at +25°C (298 mV ±5 mV max); requires external buffering to avoid loading errors.
7 (VREF)	Precision Voltage Reference	1.00 V ±5% output with 50 ppm/°C max drift; used for scaling, calibration, and transducer excitation.
8 (GND)	Analog Ground	Primary analog reference node; must be tied to system analog ground with low-impedance connection.
9 (OUT)	Open-Collector Output	NPN transistor collector; sinks up to 20 mA at V_OUT ≤ 0.4 V; emitter is uncommitted for flexible pull-up configuration.
10 (E)	Output Emitter	Open-emitter terminal of output NPN; allows floating output stage referenced to any voltage between –V_S and (+V_S – 4 V).
11 (+VS)	Positive Supply	Main positive supply rail; bypassing with 0.1–1.0 µF ceramic capacitor to analog ground is mandatory for stability.
12 (–VS)	Negative Supply	Negative supply or ground reference; case-connected in metal-can packages; must remain within safe operating voltage limits.
13 (VR)	Reference Output Guard	Guard ring connection tied to VREF output; reduces leakage and improves reference accuracy under PCB contamination.
14 (+VIN)	Noninverting Input	250 MΩ input impedance node for single-ended voltage inputs; supports 0 to (+V_S – 4) V range in single-supply mode.

Key Features

Feature	Design Value
Adaptive bias oscillator architecture	Maintains 0.1% max nonlinearity across 0.1 µA–2000 µA input range by dynamically adjusting internal bias currents based on input level.
Dual precision reference outputs	Simultaneous 1.00 V ±5% (50 ppm/°C) and 1.00 mV/K (±0.02 mV/K slope error) outputs enable self-contained calibration and temperature compensation without external references.
Wide supply range & high PSRR	Operates from 4.5 V to 36 V single supply or ±5 V to ±18 V dual supply; exhibits ±0.1%/V max supply sensitivity below 100 kHz, minimizing need for regulation.
Open-collector output with floating emitter	Supports logic interfacing to TTL, CMOS, ECL, and custom voltage domains by allowing independent setting of logic common and emitter reference levels.
SYNC input for master-slave synchronization	Enables precise timing coordination across multiple AD537SD/883B units or integration into larger synchronized data acquisition systems without external PLL circuitry.

Applications

True Two-Wire Data Transmission	Frequency-to-Voltage Conversion
Use Scenario: Transmitting analog sensor data over long-distance twisted-pair cables where power and signal share the same two wires. IC Role / Device Role / Timing Role: AD537SD/883B acts as a voltage-to-frequency modulator, converting sensor voltage into proportional frequency-modulated current on the loop. Use Value: Eliminates separate power wiring; maintains constant average loop current regardless of frequency, reducing EMI and simplifying remote power delivery.	Use Scenario: Recovering analog voltage from frequency-modulated signals in noisy industrial environments (e.g., motor speed feedback). IC Role / Device Role / Timing Role: AD537SD/883B operates in reverse F-V mode within a phase-locked loop, using its internal VCO and reference to generate a linear voltage output. Use Value: Achieves noise-immune demodulation with <3-cycle lock time and 1 V full-scale output at 10 kHz, suitable for real-time control loops.
Absolute Temperature Sensing	Thermocouple Signal Conditioning
Use Scenario: Measuring ambient or component temperature in aerospace electronics requiring traceable Kelvin-scale readings across –55°C to +125°C. IC Role / Device Role / Timing Role: AD537SD/883B serves as a direct Kelvin-to-frequency converter, using its factory-calibrated 1.00 mV/K V_TEMP output as the input to its own V-F core. Use Value: Delivers ±2°C accuracy from –55°C to +125°C without external amplifiers or ADCs-enabling simple counter-based readout with minimal BOM.	Use Scenario: Converting Type E thermocouple output (0–53.14 mV) into frequency for digital display in furnace monitoring systems. IC Role / Device Role / Timing Role: AD537SD/883B provides first-order linearization via reference-derived offset injection and scalable gain, accepting raw thermocouple voltage directly. Use Value: Achieves ±0.2% error from +400°C to +700°C using only passive components-eliminating need for microcontroller-based linearization or lookup tables.

True Two-Wire Data Transmission

Frequency-to-Voltage Conversion

Use Scenario: Transmitting analog sensor data over long-distance twisted-pair cables where power and signal share the same two wires.

IC Role / Device Role / Timing Role: AD537SD/883B acts as a voltage-to-frequency modulator, converting sensor voltage into proportional frequency-modulated current on the loop.

Use Value: Eliminates separate power wiring; maintains constant average loop current regardless of frequency, reducing EMI and simplifying remote power delivery.

Use Scenario: Recovering analog voltage from frequency-modulated signals in noisy industrial environments (e.g., motor speed feedback).

IC Role / Device Role / Timing Role: AD537SD/883B operates in reverse F-V mode within a phase-locked loop, using its internal VCO and reference to generate a linear voltage output.

Use Value: Achieves noise-immune demodulation with <3-cycle lock time and 1 V full-scale output at 10 kHz, suitable for real-time control loops.

Absolute Temperature Sensing

Thermocouple Signal Conditioning

Use Scenario: Measuring ambient or component temperature in aerospace electronics requiring traceable Kelvin-scale readings across –55°C to +125°C.

IC Role / Device Role / Timing Role: AD537SD/883B serves as a direct Kelvin-to-frequency converter, using its factory-calibrated 1.00 mV/K V_TEMP output as the input to its own V-F core.

Use Value: Delivers ±2°C accuracy from –55°C to +125°C without external amplifiers or ADCs-enabling simple counter-based readout with minimal BOM.

Use Scenario: Converting Type E thermocouple output (0–53.14 mV) into frequency for digital display in furnace monitoring systems.

IC Role / Device Role / Timing Role: AD537SD/883B provides first-order linearization via reference-derived offset injection and scalable gain, accepting raw thermocouple voltage directly.

Use Value: Achieves ±0.2% error from +400°C to +700°C using only passive components-eliminating need for microcontroller-based linearization or lookup tables.

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-to-frequency conversion applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD537KD/883B	Same die, ceramic DIP package, but rated for 0°C to +70°C operation and ±7% full-scale calibration error (vs. ±5% for AD537SD/883B).	Not qualified for extended temperature range; unsuitable for systems requiring operation below 0°C or above +70°C.	Select AD537KD/883B only if ambient conditions stay within commercial temperature range and tighter initial calibration is not required.
LM331N	Commercial-grade V/F converter; 100 kHz max frequency, no integrated temperature sensor or dual reference outputs; 0.01% typical nonlinearity but only at 10 kHz FS.	Lacks military qualification, temperature reference, and SYNC capability; requires external op-amp for current input.	Choose LM331N for cost-sensitive, non-military applications where extended temp range and integrated references are unnecessary.

Compared with AD537KD/883B, AD537SD/883B offers superior temperature range and initial accuracy; compared with LM331N, it provides integrated references, military screening, and true current-input capability-making it uniquely suited for ruggedized, self-contained analog front-ends.

Availability

AD537SD/883B is available at Aetrix Electronics and suitable for aerospace telemetry, avionics sensor interfaces, and ruggedized temperature monitoring systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD537SD/883B 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 AD537 product line was designed specifically for high-accuracy, wide-dynamic-range analog signal conditioning in mission-critical systems-emphasizing integrated references, temperature resilience, and direct transducer interfacing without external support circuitry.

FAQ

What is the maximum operating frequency and corresponding nonlinearity specification for AD537SD/883B?

The AD537SD/883B supports a maximum output frequency of 150 kHz, but its guaranteed nonlinearity is specified at 0.1% max only up to 100 kHz full-scale operation. At 10 kHz full-scale, nonlinearity improves to 0.07% max. These values are confirmed in the AD537 military databook for the "S" grade and apply directly to AD537SD/883B under standard test conditions (C = 0.01 µF, I_IN = 1 mA).

Does AD537SD/883B include an integrated temperature sensor, and what is its accuracy?

Yes, AD537SD/883B includes a factory-calibrated absolute temperature sensor output (V_TEMP) delivering 1.00 mV/K with ±0.02 mV/K slope error and ±0.1 K slope nonlinearity. Over its rated –55°C to +125°C range, it achieves ±2°C system-level accuracy when used with proper calibration-verified in the AD537 military specifications for the "S" model.

Can AD537SD/883B operate from a single supply, and what is the minimum voltage?

Yes, AD537SD/883B supports single-supply operation from 4.5 V to 36 V. This minimum 4.5 V threshold is enabled by its bandgap reference design-unlike Zener-based alternatives-and is explicitly confirmed in the "POWER SUPPLY" section of the AD537 military datasheet for all "S" grade devices including AD537SD/883B.

Is the SYNC pin available on AD537SD/883B, and what functions does it support?

Yes, the SYNC pin (Pin 2) is available on AD537SD/883B because it uses the 14-lead ceramic DIP ("D") package. It supports two verified functions: (1) synchronizing the internal oscillator to an external master clock (0.8–1.0 V p-p square wave), and (2) disabling the oscillator by shorting to +VS. Both functions are documented in the AD537 military databook for D-package variants.

What are the key differences between AD537SD/883B and AD537KD/883B?

AD537SD/883B and AD537KD/883B share the same die and ceramic DIP package but differ in temperature rating and initial accuracy: AD537SD/883B is rated for –55°C to +125°C with ±5% full-scale calibration error, while AD537KD/883B is rated for 0°C to +70°C with ±7% error. Both meet MIL-STD-883, but only AD537SD/883B is qualified for extended temperature operation.

AD537SD/883B Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 14-CDIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Type:: Voltage to Frequency

Frequency - Max:: 100 kHz

Full Scale:: ±30ppm/°C

Linearity:: ±0.05%

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: 14-CDIP

AD537SD/883B FAQ

1.How can I place an order for AD537SD/883B through Aetrix?

Please submit a Request for Quotation (RFQ) for AD537SD/883B 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 AD537SD/883B reliable?

The price and inventory of AD537SD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD537SD/883B is usually 5 days.

3.What payment methods are accepted for AD537SD/883B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD537SD/883B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD537SD/883B?

AD537SD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD537SD/883B 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 AD537SD/883B?

For technical support, including AD537SD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD537SD/883B requirements.

6.How does Aetrix verify that AD537SD/883B is sourced from the original manufacturer or authorized distributors?

All AD537SD/883B 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 AD537SD/883B meets industry standards.

7.What is the process for return or replacement of AD537SD/883B?

All AD537SD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD537SD/883B, 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 AD537SD/883B part is unused and in its original packaging.

Return procedure for AD537SD/883B:

1.Submit a request within 90 days.

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

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