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Analog Devices Inc. AD7922AUJ-R2
- Part No.:
- AD7922AUJ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
AD7922AUJ-R2.pdf
- Description:
- IC ADC DUAL 12BIT 2CH TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,924
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Product details
Overview
AD7922AUJ-R2 from Analog Devices is a 12-bit, dual-channel, successive-approximation analog-to-digital converter (ADC) with 1 MSPS throughput, operating from a single 2.35 V to 5.25 V supply. It features 71 dB minimum SNR at 100 kHz input, ±1.5 LSB max integral nonlinearity, and channel-to-channel isolation of 90 dB - enabling high-fidelity signal acquisition in space-constrained battery-powered instrumentation.
For engineers reviewing the AD7922AUJ-R2 datasheet, AD7922AUJ-R2 pinout, AD7922AUJ-R2 application, or AD7922AUJ-R2 equivalent, this device supports SPI/QSPI/MICROWIRE/DSP-compatible serial interfacing, daisy-chain configuration for multi-ADC systems, and precise timing control via CS-triggered sampling - critical for synchronized data acquisition in portable medical sensors and optical sensor front-ends.
Technical Context
The AD7922AUJ-R2 implements a track-and-hold amplifier with 290 ns acquisition time and no pipeline delay, ensuring deterministic sampling aligned to the falling edge of CS. Its internal VDD-referenced architecture eliminates external reference components while supporting 0 V to VDD analog input range across both VIN0 and VIN1 channels.
Conversion is fully controlled by the serial clock (SCLK) and chip select (CS), with conversion time fixed at 888 ns (16 SCLK cycles at 18 MHz). The DOUT stream delivers 12-bit MSB-first data prefixed by two zeros, one channel ID bit, and one mode bit - enabling unambiguous channel identification and operation-state awareness in real-time embedded firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital levels for high-precision sensor digitization. |
| Throughput Rate | 1 MSPS - supports real-time capture of fast transients up to ~500 kHz Nyquist bandwidth. |
| SNR (100 kHz) | 71 dB min - enables >11.8 effective number of bits (ENOB) in mid-frequency signal chains. |
| INL | ±1.5 LSB max (VDD = 2.35–3.6 V) - ensures monotonicity and accurate end-point linearity in closed-loop control feedback. |
| Power (3 V, 1 MSPS) | 6 mW max - allows continuous high-speed sampling in energy-sensitive PDA and wearable platforms. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1 during simultaneous or interleaved sampling. |
| Standby Current | 1 µA max - facilitates ultra-low-power sleep modes between measurement bursts. |
Pinout & Package
AD7922AUJ-R2 is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.8 mm), optimized for compact PCB layouts in portable electronics. Pin assignments follow standard TSOT top-view orientation with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT (Pin 4) | Serial data output | Three-state logic output delivering 12-bit conversion result with channel/mode identifiers on falling SCLK edges. |
| CS (Pin 3) | Chip select input | Active-low signal initiating sampling and framing serial transfer - defines exact aperture timing for synchronous acquisition. |
| SCLK (Pin 2) | Serial clock input | Master clock driving both data I/O and internal ADC conversion timing - supports up to 18 MHz for full 1 MSPS operation. |
| DIN (Pin 1) | Data input | Configures selected channel (VIN0/VIN1) and operating mode via third MSB on falling SCLK edge. |
| VIN0 (Pin 7) | Analog input 0 | Single-ended input referenced to GND, accepting 0 V to VDD signals - used for primary sensor channel. |
| VIN1 (Pin 8) | Analog input 1 | Single-ended input referenced to GND, identical electrical specs to VIN0 - enables dual-sensor or differential pair support. |
| GND (Pin 6) | Analog ground | Common reference for all analog circuitry; must be low-impedance and separated from digital return paths. |
| VDD (Pin 5) | Power supply | Single 2.35–5.25 V rail powering analog core, digital interface, and internal reference - no external reference required. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Successive approximation architecture provides deterministic, single-cycle conversion with zero latency between CS assertion and valid DOUT data. |
| Daisy-chain mode | Enables cascaded readout of multiple AD7922AUJ-R2 devices using shared SCLK/CS - reduces GPIO count and simplifies firmware for multi-channel systems. |
| VDD-referenced conversion | Internal reference derived from VDD maximizes dynamic range (0 V to VDD) without external components - lowers BOM cost and board area. |
| Flexible power management | Full power-down mode draws ≤1 µA static current; dynamic power scales linearly with throughput - ideal for duty-cycled sensing applications. |
| High input bandwidth | 8.5 MHz full-power bandwidth (−3 dB) supports accurate digitization of fast-rising pulses and wideband sensor outputs. |
Applications
| Portable Medical Instrumentation | Optical Sensor Signal Conditioning |
|---|---|
Use Scenario: Simultaneous acquisition of ECG lead voltage and respiration sensor output in handheld diagnostic devices. IC Role / Device Role / Timing Role: Dual-channel ADC performing synchronized sampling of two analog biosignals with <30 ns inter-channel skew. Use Value: 90 dB channel isolation prevents cross-coupling artifacts; 1 MSPS rate captures QRS complex morphology and respiratory envelope without aliasing. |
Use Scenario: Digitizing photodiode current outputs from ambient light and proximity sensors in smartphone front panels. IC Role / Device Role / Timing Role: High-speed, low-noise ADC converting weak analog photocurrents into digital values for ambient light compensation algorithms. Use Value: 71 dB SNR at 100 kHz ensures accurate lux-level estimation; VDD-referenced input accommodates variable LED bias conditions. |
| Battery-Powered Data Loggers | Industrial Process Monitoring |
Use Scenario: Long-duration environmental monitoring using thermistor and humidity sensor inputs powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power ADC acquiring temperature/humidity samples at programmable intervals with automatic wake-on-event capability. Use Value: 1 µA standby current extends battery life to years; flexible SCLK scaling allows throughput reduction to 10 kSPS for 3 µW average power. |
Use Scenario: Real-time monitoring of motor winding temperature and vibration acceleration in predictive maintenance gateways. IC Role / Device Role / Timing Role: Dual-input ADC capturing analog signals from RTD and piezoelectric accelerometers in harsh industrial environments. Use Value: ±1.5 LSB INL ensures calibration stability over −40°C to +85°C; 2.35 V minimum VDD supports brownout resilience during line fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7912AUJ-R2 | 10-bit resolution, 61 dB SINAD min, ±0.5 LSB INL max - lower precision but tighter DC accuracy. | Preferred where cost sensitivity outweighs SNR requirements, e.g., basic voltage monitoring in consumer IoT nodes. | Select AD7912AUJ-R2 when 10-bit resolution suffices and tighter offset/gain match (±0.3 LSB) is prioritized over dynamic range. |
| ADS8860IDRCT | 16-bit, 1 MSPS, SPI interface, but single-channel only and requires external reference - higher resolution at expense of channel count and integration. | Suitable for high-accuracy single-sensor applications like precision weigh scales, not dual-channel systems. | Choose ADS8860IDRCT only if 16-bit ENOB is mandatory and system can accommodate separate channel sequencing or additional ADCs. |
Compared with AD7912AUJ-R2 and ADS8860IDRCT, AD7922AUJ-R2 uniquely balances 12-bit resolution, dual-channel capability, VDD-referenced simplicity, and sub-1 µA standby - making it optimal for compact, battery-operated systems requiring synchronized multi-sensor fidelity without external references or layout overhead.
Availability
AD7922AUJ-R2 is available at Aetrix Electronics and suitable for portable medical instrumentation, optical sensor signal conditioning, and battery-powered data loggers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7922AUJ-R2 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 industrial, automotive, communications, and healthcare markets since 1965.
The AD79xx family - including AD7922AUJ-R2 - was designed specifically for low-power, high-speed data acquisition in space- and energy-constrained embedded systems, emphasizing integration, ease of use, and robustness across extended temperature ranges.
FAQ
What is the maximum sampling rate supported by the AD7922AUJ-R2?
The AD7922AUJ-R2 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock and 16 SCLK cycles per conversion. At lower SCLK frequencies (e.g., 5 MHz), the device maintains functional operation down to ~315 kSPS while preserving full 12-bit accuracy and timing specifications - enabling flexible trade-offs between speed and power in battery-powered designs.
Does the AD7922AUJ-R2 require an external voltage reference?
No, the AD7922AUJ-R2 uses an internal reference derived from the VDD supply, eliminating the need for external reference components. This allows full-scale input range from 0 V to VDD and simplifies design for applications where board space and BOM count are constrained - such as wearable health monitors and compact sensor modules.
How does the daisy-chain mode work on the AD7922AUJ-R2?
In daisy-chain mode, multiple AD7922AUJ-R2 devices share the same CS and SCLK lines, with DOUT of each device connected to DIN of the next. A single 16-bit SCLK sequence reads out conversion results from all chained devices sequentially - reducing microcontroller pin count and simplifying firmware for multi-channel systems without requiring additional SPI peripherals.
What is the channel-to-channel isolation specification for the AD7922AUJ-R2?
The AD7922AUJ-R2 provides 90 dB typical channel-to-channel isolation, measured by applying a full-scale sine wave to the unselected input while digitizing a 10 kHz signal on the selected channel. This high isolation prevents crosstalk-induced errors in applications like dual-sensor medical diagnostics or simultaneous voltage/current monitoring in power converters.
Can the AD7922AUJ-R2 operate from a 3.3 V supply?
Yes, the AD7922AUJ-R2 operates across a VDD range of 2.35 V to 5.25 V, fully supporting standard 3.3 V logic and analog rails. At 3.3 V and 1 MSPS, it consumes ≤6 mW and maintains 71 dB minimum SNR - making it compatible with common low-voltage microcontrollers and ideal for mixed-signal systems powered by single Li-ion cells or regulated 3.3 V supplies.
AD7922AUJ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7922AUJ-R2 FAQ
1.How can I place an order for AD7922AUJ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922AUJ-R2 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 AD7922AUJ-R2 reliable?
The price and inventory of AD7922AUJ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922AUJ-R2 is usually 5 days.
3.What payment methods are accepted for AD7922AUJ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922AUJ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922AUJ-R2?
AD7922AUJ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922AUJ-R2 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 AD7922AUJ-R2?
For technical support, including AD7922AUJ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922AUJ-R2 requirements.
6.How does Aetrix verify that AD7922AUJ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7922AUJ-R2 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 AD7922AUJ-R2 meets industry standards.
7.What is the process for return or replacement of AD7922AUJ-R2?
All AD7922AUJ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7922AUJ-R2, 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 AD7922AUJ-R2 part is unused and in its original packaging.
Return procedure for AD7922AUJ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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