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Analog Devices Inc. AD7922AUJ-REEL7
- Part No.:
- AD7922AUJ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
AD7922AUJ-REEL7.pdf
- Description:
- IC ADC DUAL 12BIT 2CH TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,795
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Product details
Overview
AD7922AUJ-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 channel-to-channel isolation of 90 dB. It serves as a high-speed data acquisition front-end in portable medical instruments and battery-powered instrumentation.
For engineers reviewing the AD7922AUJ-REEL7 datasheet, AD7922AUJ-REEL7 pinout, AD7922AUJ-REEL7 application, or AD7922AUJ-REEL7 equivalent, key selection considerations include its 12-bit resolution, TSOT-8 package, SPI/QSPI/MICROWIRE-compatible serial interface, daisy-chain capability, and guaranteed no missing codes across full scale.
Technical Context
The AD7922AUJ-REEL7 implements a true successive approximation register (SAR) architecture with no pipeline delay, enabling precise sampling control via CS falling edge and deterministic conversion timing (888 ns max at 18 MHz SCLK). Its internal track-and-hold amplifier supports >6 MHz input bandwidth and acquires signals within 290 ns.
It uses VDD as the internal reference, delivering full-scale input range of 0 V to VDD, and features flexible power management: 1 µA max standby current, dynamic power scaling with throughput, and daisy-chain mode for multi-ADC systems without additional framing logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels with guaranteed no missing codes. |
| Throughput Rate | 1 MSPS - supports real-time sampling of signals up to ~400 kHz Nyquist bandwidth. |
| SNR | 71 dB min at 100 kHz - enables accurate digitization of low-amplitude signals in noisy environments. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1 during simultaneous or interleaved sampling. |
| Supply Range | 2.35 V to 5.25 V - compatible with Li-ion, 3.3 V, and 5 V system rails without external regulators. |
| Power (3 V / 1 MSPS) | 6 mW max - enables extended battery life in portable devices with minimal thermal impact. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP-compatible - interoperates with common microcontrollers without protocol translation. |
Pinout & Package
AD7922AUJ-REEL7 is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.8 mm), optimized for space-constrained portable designs. Pin assignments follow standard TSOT top-view orientation with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN | Serial data input | Selects channel (VIN0/VIN1) and mode on falling SCLK edges; third MSB determines channel. |
| CS | Active-low chip select | Initiates conversion and frames serial data transfer; falling edge triggers sampling and conversion start. |
| SCLK | Serial clock input | Controls data I/O timing and serves as internal ADC conversion clock (16-cycle cycle for AD7922). |
| DOUT | Serial data output | Outputs 16-bit stream: two leading zeros + channel ID + mode bit + 12-bit MSB-first result. |
| VIN0, VIN1 | Analog inputs | Single-ended channels multiplexed into internal T/H; input range = 0 V to VDD, leakage ≤ ±0.3 µA. |
| GND | Analog ground | Reference for all analog circuitry; requires low-impedance connection to system AGND plane. |
| VDD | Power supply | Single supply powering analog core, digital interface, and internal reference; decoupling required per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture ensures deterministic latency (≤888 ns) and eliminates latency-induced control-loop errors. |
| Daisy-chain mode | Enables cascading multiple AD7922AUJ-REEL7 units on one SPI bus, reducing GPIO count and PCB routing complexity. |
| VDD-referenced conversion | Eliminates need for external reference IC or precision voltage divider, simplifying BOM and layout while maximizing dynamic range. |
| Low-power standby | 1 µA max shutdown current extends battery runtime in intermittent-sampling applications like sensor wake-on-event systems. |
| Flexible clock speed | Operates from 10 kHz to 18 MHz SCLK, allowing trade-off between throughput and power in variable-rate acquisition systems. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform capture in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing differential lead signals (VIN0/VIN1) at 1 MSPS with synchronized sampling and minimal inter-channel interference. Use Value: 90 dB channel isolation prevents cross-talk between limb leads; 71 dB SNR preserves diagnostic fidelity of low-amplitude R-waves and T-waves. | Use Scenario: Environmental sensor node logging temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Low-duty-cycle ADC acquiring analog sensor outputs only during scheduled wake periods, entering 1 µA standby between conversions. Use Value: 6 mW operational power at 3 V/1 MSPS and 50 nA typical shutdown current maximize energy efficiency without sacrificing 12-bit resolution. |
| Industrial Field Transmitters | Optical Sensor Signal Conditioning |
Use Scenario: 4–20 mA loop-powered transmitter measuring strain gauge or RTD outputs in harsh factory environments. IC Role / Device Role / Timing Role: Precision dual-input ADC interfacing with instrumentation amplifiers, rejecting common-mode noise via channel isolation and wide input bandwidth. Use Value: 2.35 V minimum supply allows operation directly from regulated loop supply; 71 dB SNR maintains accuracy despite EMI in motor-drive proximity. | Use Scenario: High-speed optical encoder or photodiode array readout requiring sub-microsecond sampling jitter. IC Role / Device Role / Timing Role: ADC capturing fast transient pulses from photodetectors with aperture jitter of 30 ps and acquisition time ≤290 ns. Use Value: 30 ps aperture jitter minimizes timing uncertainty in pulse-width or time-of-flight measurements; 8.5 MHz full-power bandwidth supports >1 MHz optical modulation. |
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-REEL7 | 10-bit resolution, lower SNR (61 dB min), reduced DC accuracy (±0.5 LSB INL), same package/interface. | Lower cost for non-critical applications where 10-bit resolution suffices (e.g., basic voltage monitoring). | Select when system SNR budget allows ≥10 dB margin and 10-bit quantization meets measurement requirements. |
| ADS7953IRGET | 12-bit, 1-MSPS, 8-channel, SPI interface, but requires external reference and has higher standby current (5 µA). | Higher channel count for multi-sensor systems, but larger 24-pin QFN package and added BOM complexity. | Choose when expanding beyond two analog inputs is anticipated and board area permits larger footprint. |
Compared with AD7922AUJ-REEL7, AD7912AUJ-REEL7 trades resolution and dynamic performance for cost, while ADS7953IRGET adds channel count at the expense of reference management and power efficiency-making AD7922AUJ-REEL7 optimal for compact, high-fidelity dual-channel acquisition.
Availability
AD7922AUJ-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial field transmitters, and optical sensor signal conditioning requiring stable component supply and long-term production continuity.
Supply support for AD7922AUJ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD79xx family-including AD7922AUJ-REEL7-is designed specifically for low-power, high-speed data acquisition in space- and energy-constrained applications such as portable instrumentation and sensor interfaces.
FAQ
What is the maximum sampling rate supported by the AD7922AUJ-REEL7?
The AD7922AUJ-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz serial clock and 16 SCLK cycles per conversion. At lower clock frequencies (e.g., 5 MHz), it operates at reduced rates such as 315 kSPS while maintaining full 12-bit accuracy and no missing codes.
Does the AD7922AUJ-REEL7 require an external voltage reference?
No, the AD7922AUJ-REEL7 uses its VDD supply as the internal reference, supporting a full-scale input range of 0 V to VDD. This eliminates the need for external reference components, simplifies design, and maximizes dynamic range without additional BOM cost or layout area.
How does the daisy-chain mode function on the AD7922AUJ-REEL7?
In daisy-chain mode, multiple AD7922AUJ-REEL7 devices connect serially: DOUT of one feeds DIN of the next. A single CS signal initiates conversions across all devices, and sequential SCLK cycles shift out results from each ADC in order-enabling synchronized multi-channel acquisition with minimal interface overhead.
What is the channel-to-channel isolation specification for the AD7922AUJ-REEL7?
The AD7922AUJ-REEL7 provides 90 dB typical channel-to-channel isolation, measured by applying a full-scale sine wave to one input while digitizing the other. This high isolation prevents signal coupling between VIN0 and VIN1, critical for accurate differential or independent dual-sensor measurements.
What package type is used for the AD7922AUJ-REEL7, and what are its key mechanical attributes?
The AD7922AUJ-REEL7 uses an 8-lead TSOT package (Analog Devices part number suffix "UJ"). Its dimensions are 2.1 mm × 1.6 mm × 0.8 mm with a 0.5 mm pitch, featuring an exposed thermal pad for enhanced heat dissipation in compact, thermally constrained layouts.
AD7922AUJ-REEL7 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-REEL7 FAQ
1.How can I place an order for AD7922AUJ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922AUJ-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 AD7922AUJ-REEL7 reliable?
The price and inventory of AD7922AUJ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922AUJ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7922AUJ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922AUJ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922AUJ-REEL7?
AD7922AUJ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922AUJ-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 AD7922AUJ-REEL7?
For technical support, including AD7922AUJ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922AUJ-REEL7 requirements.
6.How does Aetrix verify that AD7922AUJ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7922AUJ-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 AD7922AUJ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7922AUJ-REEL7?
All AD7922AUJ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7922AUJ-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 AD7922AUJ-REEL7 part is unused and in its original packaging.
Return procedure for AD7922AUJ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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