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

Analog Devices Inc. AD668SQ

Name: AD668SQ
Brand: Analog Devices Inc.
SKU: AD668SQ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD668SQ

Manufacturer:: Analog Devices Inc.

Category:: Digital to Analog Converters (DAC)

Package:: 24-CDIP (0.300", 7.62mm)

Datasheet:: AD668SQ.pdf

Description:: IC DAC 12BIT V-OUT 24CDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD668SQ from Analog Devices is a 12-bit ultrahigh-speed multiplying digital-to-analog converter (DAC) with current settling to 1 LSB in 90 ns and voltage settling in 120 ns, 15 MHz reference bandwidth, monotonicity guaranteed over –55°C to +125°C, and 10.24 mA current or 1.024 V voltage output - deployed in waveform generation, high-speed A/D conversion, and military-grade instrumentation.

For engineers reviewing the AD668SQ datasheet, AD668SQ pinout, AD668SQ application, or AD668SQ equivalent, this page delivers verified operating temperature range (–55°C to +125°C), laser-trimmed 12-bit linearity, MIL-STD-883-compliant cerdip package, analog input modulation range (10%–120% of nominal), and bipolar/unipolar output configuration support.

Technical Context

The AD668SQ uses Analog Devices' Complementary Bipolar (CB) process with vertical NPN/PNP devices on a single die, enabling monolithic integration of high-speed switching and precision trimming without dielectric isolation. Its reference channel employs a closed-loop buffered amplifier with 15 MHz small-signal bandwidth and 3% FS/ns slew rate.

Bit weighting combines matched current sources and thin-film ladder techniques; output resistance is trimmed to 100 Ω ±1% (inclusive of internal 200 Ω RL); analog input scaling supports 1 V, 1.25 V, or 5 V references via laser-trimmed resistive dividers at Pins 21/22; bipolar operation is enabled by pin-strapping Pin 16 to IOUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12 bits - guarantees 4096 distinct output levels with monotonicity across full temperature range.
Digital Settling Time	90 ns to ±0.025% of FSR - enables >10 MSPS update rates for real-time waveform synthesis.
Analog Settling Time	120 ns to ±0.025% of FSR - supports high-frequency modulation up to 10 MHz large-signal bandwidth.
Reference Bandwidth	15 MHz small-signal - allows direct RF modulation of DAC full-scale using analog input.
Output Compliance	–2 V to +1.2 V - defines safe voltage swing at IOUT pin without degrading accuracy or risking saturation.
Temperature Range	–55°C to +125°C - qualified for extended-range military, aerospace, and downhole industrial applications.
Linearity Error	±0.5 LSB max over temperature - laser-trimmed guarantee ensures consistent transfer function stability.
Output Resistance	100 Ω ±1% (inclusive of RL) - enables precise gain control and predictable load interaction in voltage-output mode.

Pinout & Package

AD668SQ is housed in a 24-pin cerdip (0.3" "skinny DIP") package compliant with MIL-STD-883 screening requirements. The package provides hermetic sealing and thermal robustness for extreme-environment deployment.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Positive supply	+10.8 V to +16.5 V; supplies ~32 mA typical; current scales linearly with analog input level.
VEE	Negative supply	–10.8 V to –16.5 V; supplies ~9 mA typical; independent of digital code, dependent on analog input.
IOUT	Main current output	Delivers 0–10.24 mA (unipolar) or ±5.12 mA (bipolar); compliance –2 V to +1.2 V relative to LCOM.
LCOM	Ladder common ground	Carries full-scale analog-dependent current (~10.24 mA); ground drop directly impacts analog feedthrough error.
REFIN1 / REFIN2	Reference input divider nodes	Configure 1 V / 1.25 V / 5 V full-scale reference; REFIN1 has 1 kΩ series R, REFIN2 has 4 kΩ series R.
REFCOM	Reference amplifier ground	Provides reference ground for feedback loop and negative supply for reference amp; carries 4.2 mA total.
RL	Internal load resistor	200 Ω resistor tied internally to IOUT; grounding RL yields 100 Ω ±1% output impedance for voltage mode.
IBPO	Bipolar offset current sink	High-impedance current source for bipolar zero-point adjustment; must be grounded if unused.
VTH / THCOM	Digital threshold reference	VTH = 1.4 V above THCOM; bandgap-generated logic threshold independent of supply voltage.
D0–D11	Digital inputs	TTL/5 V CMOS compatible; VIH = 2.0–7.0 V, VIL = 0–0.8 V; input currents < 100 µA (sinking) or ±10 µA (sourcing).
PIN 16	Bipolar mode enable	Connect to IOUT to activate two-quadrant operation; leave open or ground for unipolar mode.

Key Features

Feature	Design Value
Ultrahigh-speed settling	90 ns digital settling to ±0.025% FSR enables >11 MSPS real-time signal reconstruction.
Laser-trimmed output resistance	100 Ω ±1% (inclusive of RL) ensures stable gain and predictable loading in voltage-output configurations.
10%–120% analog input modulation	Allows dynamic full-scale adjustment without external gain stages - critical for AGC and calibration loops.
MIL-STD-883 compliant cerdip	24-pin hermetic package qualified for extended temperature, shock, vibration, and long-term reliability in defense systems.
Bipolar/unipolar pin-strappable mode	No external components needed: connect Pin 16 to IOUT for ±5.12 mA output; ground for 0–10.24 mA.
Trimmed reference amplifier	15 MHz bandwidth + 3% FS/ns slew rate supports high-fidelity analog modulation up to 10 MHz.

Applications

Radar Waveform Synthesis	High-Speed Data Acquisition Calibration
Use Scenario: Generating programmable IF/RF excitation waveforms in pulsed radar transceivers requiring nanosecond-level timing fidelity and amplitude repeatability across wide temperature swings. IC Role / Device Role / Timing Role: Multiplying DAC providing digitally controlled analog envelope shaping and carrier modulation under FPGA or microcontroller command. Use Value: 90 ns digital settling and –55°C to +125°C monotonicity ensure deterministic pulse edge placement and amplitude consistency in airborne radar front ends.	Use Scenario: Calibrating 16-bit+ ADCs in automated test equipment where DAC-generated reference signals must track gain/offset drift over thermal cycles. IC Role / Device Role / Timing Role: Precision multiplying DAC serving as programmable reference source with analog-input-based full-scale scaling for self-calibration routines. Use Value: 10%–120% analog modulation range and ±0.5 LSB linearity error allow accurate end-to-end system gain characterization without hardware reconfiguration.
Military Avionics Signal Generation	Downhole Oil & Gas Instrumentation
Use Scenario: Producing flight-critical sensor excitation signals (e.g., LVDT/RVDT drive) in fly-by-wire control units operating in jet engine bays. IC Role / Device Role / Timing Role: Temperature-stable multiplying DAC generating high-fidelity AC excitation synchronized to inertial measurement unit clocks. Use Value: MIL-STD-883 cerdip packaging and –55°C to +125°C guaranteed monotonicity eliminate thermal-induced nonlinearity in safety-critical feedback paths.	Use Scenario: Driving piezoelectric transducers and acoustic telemetry modulators in borehole logging tools exposed to 150°C ambient and mechanical shock. IC Role / Device Role / Timing Role: High-reliability DAC delivering precisely timed voltage/current pulses for seismic source triggering and data encoding. Use Value: Hermetic cerdip construction and 100 Ω ±1% trimmed output resistance maintain signal integrity and impedance matching under extreme thermal cycling and vibration.

Radar Waveform Synthesis

High-Speed Data Acquisition Calibration

Use Scenario: Generating programmable IF/RF excitation waveforms in pulsed radar transceivers requiring nanosecond-level timing fidelity and amplitude repeatability across wide temperature swings.

IC Role / Device Role / Timing Role: Multiplying DAC providing digitally controlled analog envelope shaping and carrier modulation under FPGA or microcontroller command.

Use Value: 90 ns digital settling and –55°C to +125°C monotonicity ensure deterministic pulse edge placement and amplitude consistency in airborne radar front ends.

Use Scenario: Calibrating 16-bit+ ADCs in automated test equipment where DAC-generated reference signals must track gain/offset drift over thermal cycles.

IC Role / Device Role / Timing Role: Precision multiplying DAC serving as programmable reference source with analog-input-based full-scale scaling for self-calibration routines.

Use Value: 10%–120% analog modulation range and ±0.5 LSB linearity error allow accurate end-to-end system gain characterization without hardware reconfiguration.

Military Avionics Signal Generation

Downhole Oil & Gas Instrumentation

Use Scenario: Producing flight-critical sensor excitation signals (e.g., LVDT/RVDT drive) in fly-by-wire control units operating in jet engine bays.

IC Role / Device Role / Timing Role: Temperature-stable multiplying DAC generating high-fidelity AC excitation synchronized to inertial measurement unit clocks.

Use Value: MIL-STD-883 cerdip packaging and –55°C to +125°C guaranteed monotonicity eliminate thermal-induced nonlinearity in safety-critical feedback paths.

Use Scenario: Driving piezoelectric transducers and acoustic telemetry modulators in borehole logging tools exposed to 150°C ambient and mechanical shock.

IC Role / Device Role / Timing Role: High-reliability DAC delivering precisely timed voltage/current pulses for seismic source triggering and data encoding.

Use Value: Hermetic cerdip construction and 100 Ω ±1% trimmed output resistance maintain signal integrity and impedance matching under extreme thermal cycling and vibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiplying DAC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD9764ASTZ	14-bit, 125 MSPS, current-output only; no analog modulation input; requires external op-amp for voltage output.	Higher resolution but lacks multiplying architecture - unsuitable for analog-gain-controlled applications like AGC.	Select AD9764ASTZ only when pure high-speed current sourcing is required and analog input modulation is unnecessary.
MAX5722ETL+	12-bit, 2.5 MSPS, rail-to-rail voltage output; integrated reference; no analog modulation path; commercial temp only (–40°C to +85°C).	Lower speed, no multiplying capability, and narrower temperature range limit use to non-military embedded systems.	Choose MAX5722ETL+ for cost-sensitive, low-power, non-extreme-temperature applications where analog gain control is not needed.

Compared with AD9764ASTZ and MAX5722ETL+, the AD668SQ uniquely combines 12-bit multiplying functionality, –55°C to +125°C guaranteed monotonicity, and 90 ns digital settling - making it irreplaceable in analog-modulated, high-reliability waveform generation where temperature stability and speed are co-constrained.

Availability

AD668SQ is available at Aetrix Electronics and suitable for radar waveform synthesis, high-speed data acquisition calibration, and military avionics signal generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD668SQ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD668 product line was designed specifically for ultrahigh-speed, temperature-stable multiplying DAC applications in defense, aerospace, and industrial instrumentation - emphasizing monolithic CB-process integration, laser trimming, and MIL-qualified packaging.

FAQ

What is the maximum operating temperature range for the AD668SQ?

The AD668SQ is specified for operation from –55°C to +125°C and guaranteed monotonic across this full range. This extended temperature qualification - exceeding commercial and industrial grades - makes the AD668SQ suitable for deployment in jet engine bays, downhole tools, and space-qualified systems where thermal extremes degrade standard DAC performance.

Does the AD668SQ support both unipolar and bipolar output modes?

Yes, the AD668SQ supports both unipolar (0 to 10.24 mA or 0 to 1.024 V) and bipolar (±5.12 mA or ±0.512 V) outputs. Bipolar mode is activated by connecting Pin 16 (IBPO) to Pin 20 (IOUT); no external components are required. Unipolar mode uses Pin 16 grounded. Both modes retain full 12-bit linearity and settling performance.

What reference voltages does the AD668SQ accept, and how are they configured?

The AD668SQ accepts 1 V, 1.25 V, or 5 V nominal reference inputs via laser-trimmed resistive dividers at Pins 21 (REFIN1) and 22 (REFIN2). A 5 V reference is set by grounding REFIN1 and applying voltage to REFIN2; 1 V mode uses both pins in parallel. Input impedance is 1 MΩ (1 V), 5 kΩ (5 V), or 5 kΩ (1.25 V), with 10%–120% modulation range preserved across all configurations.

Is the AD668SQ pin-compatible with other AD668 grade variants like AD668JQ or AD668AQ?

Yes, all AD668 variants - including AD668SQ, AD668JQ, AD668KQ, and AD668AQ - share identical 24-pin cerdip (Q-24) pinouts and electrical interface definitions. The only differences are temperature grading, linearity error (±0.5 LSB for AD668SQ vs. ±0.25 LSB for KQ), and gain drift (±40 ppm/°C for AD668SQ). PCB layout and firmware remain unchanged across grades.

What is the purpose of the RL pin (Pin 19) on the AD668SQ?

RL (Pin 19) is an internal 200 Ω resistor tied to IOUT (Pin 20). Grounding RL yields a total output resistance of 100 Ω ±1%, optimizing voltage-mode accuracy and stability. Shorting RL to IOUT gives 200 Ω ±20% output impedance - preferred for current-output applications where load independence is critical. RL configuration directly determines output impedance and gain predictability in voltage-output circuits.

AD668SQ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: AD668

Package/Case:: 24-CDIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Number of Bits:: 12

Number of D/A Converters:: 1

Settling Time:: -

Output Type:: Voltage - Unbuffered

Differential Output:: No

Data Interface:: Parallel

Reference Type:: External

Voltage - Supply, Analog:: -

Voltage - Supply, Digital:: -

INL/DNL (LSB):: ±0.25, ±0.5

Architecture:: Multiplying DAC

Operating Temperature:: -55°C ~ 125°C

Supplier Device Package:: 24-CDIP

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

AD668SQ FAQ

1.How can I place an order for AD668SQ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD668SQ 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 AD668SQ reliable?

The price and inventory of AD668SQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD668SQ is usually 5 days.

3.What payment methods are accepted for AD668SQ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD668SQ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD668SQ?

AD668SQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD668SQ 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 AD668SQ?

For technical support, including AD668SQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD668SQ requirements.

6.How does Aetrix verify that AD668SQ is sourced from the original manufacturer or authorized distributors?

All AD668SQ 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 AD668SQ meets industry standards.

7.What is the process for return or replacement of AD668SQ?

All AD668SQ units undergo pre-shipment inspection (PSI). If there is an issue with AD668SQ, 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 AD668SQ part is unused and in its original packaging.

Return procedure for AD668SQ:

1.Submit a request within 90 days.

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

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