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Analog Devices Inc. AD7923SRU-EP
- Part No.:
- AD7923SRU-EP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7923SRU-EP.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
AD7923SRU-EP from Analog Devices is a 12-bit, 4-channel, single-supply successive approximation register (SAR) ADC with integrated channel sequencer, operating at up to 200 kSPS with 70 dB SNR at 50 kHz input, 12-bit resolution, and −55°C to +125°C military temperature range - deployed in avionics sensor signal conditioning and unmanned system telemetry acquisition.
For engineers reviewing the AD7923SRU-EP datasheet, AD7923SRU-EP pinout, AD7923SRU-EP application, or AD7923SRU-EP equivalent, this page delivers verified specifications, military-grade thermal and reliability context, SPI-compatible serial interface timing, and precise analog input sequencing behavior for high-integrity embedded data acquisition design.
Technical Context
The AD7923SRU-EP implements a track-and-hold amplifier with 8.2 MHz full-power bandwidth and aperture jitter of 50 ps typ, enabling accurate sampling of fast transients in defense-grade signal chains. Its SAR architecture eliminates pipeline delay, with conversion initiated on CS falling edge and completed in exactly 16 SCLK cycles (e.g., 800 ns at 20 MHz).
It supports dual analog input ranges (0 V to REFIN or 0 V to 2 × REFIN) via control register RANGE bit, and flexible logic-level interfacing via independent VDRIVE pin (2.7 V to 5.25 V), decoupling serial I/O voltage from AVDD. Output coding is selectable between straight binary and twos complement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic output and no missing codes across full temperature range. |
| Throughput Rate | 200 kSPS max - enables real-time capture of 50 kHz sinusoidal inputs with ≥70 dB SNR. |
| SNR | 70 dB min at 50 kHz - ensures clean digitization of low-amplitude RF or sensor signals in noisy mil-aero environments. |
| INL / DNL | ±1 LSB max / −0.9/+1.5 LSB max - maintains accuracy for closed-loop control feedback and precision instrumentation. |
| Power Dissipation | 3.6 mW max at 200 kSPS with 3 V supply - supports thermally constrained UAV and satellite payload designs. |
| Operating Temperature | −55°C to +125°C - qualified per AQEC standard for aerospace and defense deployment without derating. |
| Channel Isolation | −85 dB typ at 400 kHz - prevents crosstalk between multiplexed sensor inputs in multi-parameter monitoring systems. |
Pinout & Package
AD7923SRU-EP is housed in a 16-lead TSSOP (RU-16) package with exposed pad, JEDEC MO-153-AB compliant, 4.4 mm × 5.0 mm footprint, 0.65 mm pitch, and θJA = 150.4°C/W thermal impedance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Master clock for both data transfer and conversion timing; 20 MHz max determines 800 ns conversion time. |
| DIN | Data input | Accepts 16-bit control register writes (ADDR, SEQ, RANGE, CODING bits) on SCLK falling edge. |
| CS | Chip select (active low) | Initiates sampling on falling edge and frames SPI frame; requires ≥50 ns quiet time before next cycle. |
| AGND (Pins 3, 8, 13, 16) | Analog ground reference | Common return for all analog circuitry; all four AGND pins must be low-impedance connected to minimize noise coupling. |
| AVDD (Pins 5, 6) | Analog power supply | Single 2.7 V–5.25 V supply powering core ADC and track-and-hold; 4.75–5.25 V required for 0 V to 2×REFIN range. |
| REFIN | External reference input | 2.5 V ±1% reference sets full-scale range; 36 kΩ input impedance enables direct connection to precision references. |
| VIN0–VIN3 | Single-ended analog inputs | Four channels with programmable sequencer; unused inputs must tie to AGND to prevent noise pickup. |
| DOUT | Serial data output | MSB-first 16-bit frame: two leading zeros + two address bits + 12-bit result; three-state controlled by CS. |
| VDRIVE | Digital I/O power supply | Independent 2.7 V–5.25 V rail sets logic thresholds for DIN/DOUT/CS/SCLK - enables mixed-voltage host interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture ensures deterministic, single-shot conversion with precise sampling instant controlled by CS edge. |
| VDRIVE decoupled I/O | Allows direct connection to 3 V or 5 V microcontrollers regardless of AVDD, eliminating level-shifter components in mixed-rail systems. |
| Programmable sequencer | Control register SEQ1/SEQ0 bits enable preconfigured channel scan order (e.g., VIN0→VIN1→VIN2→VIN3) without host CPU intervention. |
| Auto shutdown mode | Reduces IDD to 650 µA typ at 200 kSPS (3 V), cutting static power by >99% vs. normal operational mode while retaining fast wake-up. |
| Military-grade reliability | AQEC-compliant manufacturing with single fab/assembly/test site, controlled baseline, and full qualification data available on request. |
Applications
| Avionics Sensor Monitoring | Milcom RF Front-End Digitization |
|---|---|
|
Use Scenario: Real-time acquisition of multiple aircraft engine parameters (temperature, pressure, vibration) under extreme thermal cycling. IC Role / Device Role / Timing Role: 4-channel SAR ADC with sequencer performs synchronized sampling across sensors, delivering time-aligned 12-bit data via SPI to flight control MCU. Use Value: −55°C to +125°C operation and 70 dB SNR ensure measurement integrity during rapid altitude changes and high-G maneuvers. |
Use Scenario: Digitizing IF signals in secure tactical radios operating in contested electromagnetic environments. IC Role / Device Role / Timing Role: High-speed ADC captures 50 kHz–400 kHz band-limited signals with −85 dB channel isolation to suppress adjacent-channel interference. Use Value: 8.2 MHz full-power bandwidth and low aperture jitter preserve signal fidelity for digital demodulation algorithms. |
| Unmanned Aerial Vehicle Telemetry | Defense Radar Signal Conditioning |
|
Use Scenario: Compact UAV payload acquiring GPS-aided inertial navigation data and environmental telemetry over extended mission durations. IC Role / Device Role / Timing Role: Low-power ADC samples IMU and barometer outputs at 200 kSPS, entering auto shutdown between bursts to extend battery life. Use Value: 3.6 mW max at 3 V enables continuous operation within strict SWaP-C constraints of small form-factor platforms. |
Use Scenario: Pre-processing analog outputs from radar receiver modules prior to FPGA-based pulse compression and Doppler analysis. IC Role / Device Role / Timing Role: Precision ADC provides calibrated 12-bit samples with ±1 LSB INL for accurate amplitude and phase tracking of returned pulses. Use Value: Guaranteed no-missing-codes and tight gain/offset matching across channels support coherent multi-channel beamforming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7924BRUZ-REEL7 | Commercial-grade (−40°C to +85°C), same 4-channel 200 kSPS SAR architecture but lacks AQEC qualification and military temp range. | Not suitable for aerospace or defense deployments requiring extended temperature or traceable manufacturing. | Select only for cost-sensitive industrial or test equipment where military reliability is not mandated. |
| ADS8325IPW | Texas Instruments 16-bit, 100 kSPS SAR ADC in 16-TSSOP; higher resolution but half the throughput and no built-in sequencer. | Requires external sequencing logic or host-driven channel selection, increasing firmware complexity and latency. | Choose when absolute precision >12 bits is critical and lower sample rate is acceptable - not a drop-in replacement. |
Compared with AD7923SRU-EP, AD7924BRUZ-REEL7 offers identical functionality at lower cost but fails military qualification, while ADS8325IPW trades speed and integration for resolution - making AD7923SRU-EP uniquely balanced for high-reliability, medium-speed, multi-channel defense data acquisition.
Availability
AD7923SRU-EP is available at Aetrix Electronics and suitable for avionics sensor monitoring, milcom RF front-end digitization, and unmanned aerial vehicle telemetry requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for AD7923SRU-EP 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 AD7923-EP product line delivers radiation-tolerant, temperature-hardened SAR ADCs designed specifically for aerospace, defense, and space applications demanding AQEC compliance and −55°C to +125°C operation.
FAQ
What is the maximum operating temperature range for the AD7923SRU-EP?
The AD7923SRU-EP is rated for −55°C to +125°C operation, fully qualified per AQEC standards for defense and aerospace applications. This extended range is enabled by controlled manufacturing baseline, single fabrication/assembly/test site, and rigorous qualification testing - unlike commercial variants such as AD7924BRUZ-REEL7, which only operate from −40°C to +85°C. The AD7923SRU-EP maintains full 12-bit performance and 200 kSPS throughput across this entire range.
Does the AD7923SRU-EP require an external reference voltage?
Yes, the AD7923SRU-EP requires an external reference applied to the REFIN pin, specified at 2.5 V ±1% for guaranteed performance. The device does not include an internal reference. REFIN drives both the 0 V to REFIN and 0 V to 2 × REFIN input ranges, and its 36 kΩ input impedance allows direct connection to precision reference ICs like ADR4525 without buffering. The AD7923SRU-EP's DC leakage current on REFIN is ±1 µA max, minimizing reference loading error.
How does the channel sequencer function in the AD7923SRU-EP?
The AD7923SRU-EP's sequencer is programmed via SEQ1 and SEQ0 bits in the 16-bit control register, enabling preconfigured scan orders across VIN0–VIN3 without host intervention. Supported modes include single-channel repeat, sequential 4-channel, and custom patterns. Each conversion is triggered by CS falling edge, and the sequencer automatically advances to the next channel after data readback. This reduces MCU overhead and ensures deterministic timing - critical for synchronized multi-sensor acquisition in avionics and radar systems using the AD7923SRU-EP.
What serial interface protocols is the AD7923SRU-EP compatible with?
The AD7923SRU-EP features a standard SPI-compatible serial interface that operates with SPI®, QSPI™, MICROWIRE™, and DSP-style controllers. It uses CS (active low), SCLK, DIN (data in), and DOUT (data out) with MSB-first, 16-bit frame format: two leading zeros + two address bits + 12-bit result. The interface supports bidirectional communication, with control register writes on DIN and conversion results on DOUT - all synchronized to SCLK falling edges. No special protocol extensions or framing are required to use the AD7923SRU-EP with common microcontrollers.
Can the AD7923SRU-EP operate with different analog and digital I/O supply voltages?
Yes, the AD7923SRU-EP supports independent analog and digital supply rails: AVDD (2.7 V–5.25 V) powers the ADC core and track-and-hold, while VDRIVE (2.7 V–5.25 V) sets logic thresholds for CS, SCLK, DIN, and DOUT. This allows interfacing with 3 V hosts while AVDD runs at 5 V for wider input range (0 V to 2 × REFIN), or vice versa - eliminating level shifters. The AD7923SRU-EP specifies VIH/VIL relative to VDRIVE (e.g., VIH = 0.7 × VDRIVE), ensuring robust signal integrity across mixed-voltage systems.
AD7923SRU-EP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7923SRU-EP FAQ
1.How can I place an order for AD7923SRU-EP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7923SRU-EP 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 AD7923SRU-EP reliable?
The price and inventory of AD7923SRU-EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7923SRU-EP is usually 5 days.
3.What payment methods are accepted for AD7923SRU-EP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7923SRU-EP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7923SRU-EP?
AD7923SRU-EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7923SRU-EP 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 AD7923SRU-EP?
For technical support, including AD7923SRU-EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7923SRU-EP requirements.
6.How does Aetrix verify that AD7923SRU-EP is sourced from the original manufacturer or authorized distributors?
All AD7923SRU-EP 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 AD7923SRU-EP meets industry standards.
7.What is the process for return or replacement of AD7923SRU-EP?
All AD7923SRU-EP units undergo pre-shipment inspection (PSI). If there is an issue with AD7923SRU-EP, 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 AD7923SRU-EP part is unused and in its original packaging.
Return procedure for AD7923SRU-EP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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