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Analog Devices Inc. AD7922AUJZ-REEL7
- Part No.:
- AD7922AUJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
AD7922AUJZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,768
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Product details
Overview
AD7922AUJZ-REEL7 from Analog Devices is a 12-bit, dual-channel, successive approximation analog-to-digital converter (ADC) operating from a single 2.35 V to 5.25 V supply with 1 MSPS throughput, 71 dB minimum SNR at 100 kHz input, and daisy-chain capability for multi-ADC systems in portable medical instruments and battery-powered data acquisition.
For engineers reviewing the AD7922AUJZ-REEL7 datasheet, AD7922AUJZ-REEL7 pinout, AD7922AUJZ-REEL7 application, or AD7922AUJZ-REEL7 equivalent, key selection considerations include its 12-bit resolution, 1 MSPS sampling rate, TSOT-8 package, SPI/QSPI/MICROWIRE-compatible serial interface, and channel-to-channel isolation of 90 dB - all critical for high-fidelity, low-power signal digitization in space-constrained embedded systems.
Technical Context
The AD7922AUJZ-REEL7 implements a track-and-hold amplifier with 290 ns acquisition time and no pipeline delay, enabling precise sampling of signals up to 8.5 MHz full-power bandwidth. Its conversion is initiated by CS falling edge and clocked by SCLK, with sample timing fully controlled by external logic.
It uses internal VDD-referenced conversion, eliminating need for external reference, and supports three operational modes: normal, power-down (1 µA max), and daisy-chain. The serial output includes channel ID and mode bits, allowing unambiguous identification of source channel and operation state in multi-device configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VDD/4096 quantization step, enabling sub-millivolt precision with 3 V supply. |
| Throughput Rate | 1 MSPS - supports real-time capture of signals up to 500 kHz Nyquist bandwidth without aliasing. |
| SNR | 71 dB min at 100 kHz - ensures ≥11.8 effective number of bits (ENOB) for clean signal reconstruction. |
| Channel Isolation | 90 dB typ - suppresses crosstalk between VIN0 and VIN1, critical for simultaneous dual-sensor monitoring. |
| Power Consumption | 4.8 mW typ at 3 V / 1 MSPS - enables >100 hours runtime on a 300 mAh coin cell in periodic-sampling mode. |
| Supply Range | 2.35 V to 5.25 V - compatible with Li-ion, Li-poly, and regulated 3.3 V/5 V rails without level-shifting. |
| Interface | SPI/QSPI/MICROWIRE/DSP-compatible - interoperates with ARM Cortex-M, TI C2000, and FPGA soft peripherals. |
Pinout & Package
AD7922AUJZ-REEL7 is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.55 mm), optimized for compact PCB layouts in handheld and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN | Serial data input | Selects VIN0/VIN1 channel via third MSB; enables mode control and daisy-chain configuration. |
| CS | Chip select (active low) | Initiates conversion on falling edge and frames serial data transfer; supports multi-device sharing of SCLK/DOUT lines. |
| SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 18 MHz for 1 MSPS operation. |
| DOUT | Serial data output | Outputs 16-bit stream: two leading zeros + channel ID + mode bit + 12-bit result (MSB first); tri-state capable. |
| VIN0, VIN1 | Analog inputs | Single-ended, 0–VDD range; multiplexed into shared track-and-hold; 20 pF input capacitance requires low-Z drive. |
| GND | Analog ground | Reference for all analog circuitry; must be star-connected to minimize noise coupling into conversion path. |
| VDD | Power supply | Single 2.35–5.25 V rail powers analog and digital sections; internal reference derived directly from VDD. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, one-shot conversion per CS pulse - essential for time-critical trigger-based acquisition. |
| Daisy-chain mode | Allows cascading multiple AD7922AUJZ-REEL7 devices on shared SCLK/DOUT bus, reducing GPIO count in multi-channel systems. |
| Flexible power management | Full power-down mode draws ≤1 µA, enabling microamp-level sleep current while preserving configuration state. |
| VDD-referenced conversion | Eliminates external reference IC and associated BOM cost, layout area, and drift error - simplifies design and improves system accuracy. |
| High channel isolation | 90 dB typical crosstalk rejection allows independent measurement of two closely coupled sensors (e.g., differential pressure or ECG leads) without calibration compensation. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Simultaneous acquisition of ECG lead I and II signals in a handheld cardiac monitor with <500 µA average system current. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two analog bio-potential inputs at 1 MSPS with synchronized sampling, delivering 12-bit results via SPI to an ultra-low-power MCU. Use Value: 90 dB channel isolation prevents cross-talk between leads; 71 dB SNR ensures diagnostic-grade waveform fidelity; TSOT-8 footprint minimizes board area in palm-sized enclosure. | Use Scenario: Environmental sensor node logging temperature and humidity over 24-hour cycles using intermittent 10 kSPS bursts. IC Role / Device Role / Timing Role: ADC samples two analog sensor outputs on demand, enters 1 µA power-down between bursts, and transmits data via low-energy Bluetooth. Use Value: 4.8 mW active power at 3 V extends battery life; daisy-chain support allows future expansion to four channels without redesign; 2.35 V minimum supply tolerates aging battery discharge. |
| Optical Sensor Interface | Industrial Control Loop Monitoring |
Use Scenario: Digitizing photodiode and ambient light sensor outputs in an adaptive display backlight controller. IC Role / Device Role / Timing Role: AD7922AUJZ-REEL7 acquires both analog feedback signals synchronously to compute real-time PWM duty cycle adjustments. Use Value: 290 ns acquisition time captures fast LED transient responses; VDD-referenced design eliminates reference drift-induced brightness error; 8.5 MHz bandwidth handles modulated optical signals. | Use Scenario: Retrofitting legacy PLC I/O modules with dual analog input capability for motor current and temperature sensing. IC Role / Device Role / Timing Role: ADC interfaces to isolated analog front-end, streams 12-bit data to FPGA over SPI, and supports daisy-chained expansion across multiple slots. Use Value: SPI compatibility ensures drop-in integration with existing controller firmware; 1 MSPS rate supports closed-loop response times <1 µs; TSOT-8 allows high-density channel packing on carrier board. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7923BRMZ-REEL | 12-bit, 1 MSPS, 4-channel, MSOP-10 package; requires external reference; higher 6.5 mW power at 3 V. | Supports 4 inputs vs. 2; lacks daisy-chain mode; larger footprint limits ultra-compact designs. | Choose when expanding beyond two channels is anticipated and board area permits MSOP-10. |
| ADS7953IRHBT | 12-bit, 1 MSPS, 16-channel, QFN-32; SPI interface; 3.3 V only; 1.2 µA standby current. | Offers high channel density but consumes more PCB area and requires level-shifting for 5 V systems. | Prefer for multi-sensor industrial panels where channel count outweighs size constraints. |
Compared with AD7923BRMZ-REEL and ADS7953IRHBT, AD7922AUJZ-REEL7 uniquely balances minimal footprint (TSOT-8), integrated VDD reference, daisy-chain scalability, and ultra-low 1 µA power-down - making it optimal for size- and battery-limited dual-signal applications where channel expansion is not immediate.
Availability
AD7922AUJZ-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, optical sensor interface, and industrial control loop monitoring requiring stable component supply and long-term production continuity.
Supply support for AD7922AUJZ-REEL7 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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD79xx family targets precision, low-power, high-speed data acquisition in resource-constrained environments - emphasizing small packaging, flexible supply operation, and simplified system integration through features like VDD referencing and daisy-chain capability.
FAQ
What is the maximum sampling rate supported by the AD7922AUJZ-REEL7?
The AD7922AUJZ-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz SCLK and 16 SCLK cycles per conversion. At lower clock frequencies, the sampling rate scales linearly - e.g., 5 MHz SCLK yields ~315 kSPS - while maintaining full 12-bit accuracy and specified dynamic performance across the −40°C to +85°C industrial temperature range.
Does the AD7922AUJZ-REEL7 require an external voltage reference?
No, the AD7922AUJZ-REEL7 uses an internal reference derived directly from the VDD supply, eliminating the need for an external reference IC. This simplifies BOM, reduces PCB area, and avoids reference drift errors - though full-scale range remains tied to VDD stability, so a well-regulated supply is recommended for highest accuracy applications.
How does the daisy-chain mode work on the AD7922AUJZ-REEL7?
In daisy-chain mode, multiple AD7922AUJZ-REEL7 devices share a single SCLK and DOUT line, with DOUT of one device connected to DIN of the next. A single CS pulse initiates conversions across all devices simultaneously, and results are shifted out sequentially - 16 bits per device - allowing multi-channel acquisition with minimal GPIO usage and deterministic inter-channel timing.
What is the power consumption of the AD7922AUJZ-REEL7 in power-down mode?
The AD7922AUJZ-REEL7 draws a maximum of 1 µA in full power-down mode, with typical current as low as 50 nA at 25°C. This ultra-low quiescent current enables extended battery life in intermittently active systems - for example, a 300 mAh battery could sustain over 3 years of standby time before depletion, assuming only brief wake-up intervals for measurement.
Can the AD7922AUJZ-REEL7 interface directly with a 5 V microcontroller SPI port?
Yes, the AD7922AUJZ-REEL7 supports VDD up to 5.25 V and specifies VIH = 2 V min (for VDD > 2.7 V) and VOL = 0.2 V max, ensuring reliable logic-level compatibility with standard 5 V SPI peripherals. However, the SCLK, CS, and DIN signals must be driven within the AD7922AUJZ-REEL7's absolute maximum ratings (−0.3 V to VDD + 0.3 V), so direct connection is safe without level shifters when VDD = 5 V.
AD7922AUJZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 2
- 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:
- Supply
- Voltage - Supply, Analog:
- 2.35V ~ 5.25V
- Voltage - Supply, Digital:
- 2.35V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- TSOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7922AUJZ-REEL7 FAQ
1.How can I place an order for AD7922AUJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922AUJZ-REEL7 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 AD7922AUJZ-REEL7 reliable?
The price and inventory of AD7922AUJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922AUJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7922AUJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922AUJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922AUJZ-REEL7?
AD7922AUJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922AUJZ-REEL7 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 AD7922AUJZ-REEL7?
For technical support, including AD7922AUJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922AUJZ-REEL7 requirements.
6.How does Aetrix verify that AD7922AUJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7922AUJZ-REEL7 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 AD7922AUJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7922AUJZ-REEL7?
All AD7922AUJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7922AUJZ-REEL7, 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 AD7922AUJZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7922AUJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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