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Analog Devices Inc. AD7922ARM
- Part No.:
- AD7922ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7922ARM.pdf
- Description:
- IC ADC 12BIT 1MSPS DUAL 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,753
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Product details
Overview
AD7922ARM 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. It delivers 1 MSPS throughput, 71 dB minimum SNR at 100 kHz input, and −81 dB typical THD - enabling high-fidelity signal digitization in space-constrained, battery-powered instrumentation and sensor interfaces.
For engineers reviewing the AD7922ARM datasheet, AD7922ARM pinout, AD7922ARM application, or AD7922ARM equivalent, this page provides verified technical context, real-world timing behavior, daisy-chain interface details, channel-isolation performance, and validated alternative options for low-power, dual-input data acquisition systems.
Technical Context
The AD7922ARM implements a true successive-approximation architecture with no pipeline delay, using CS-controlled sampling and SCLK-synchronized conversion. Its internal track-and-hold amplifier supports full-power bandwidth up to 8.5 MHz and achieves 290 ns acquisition time.
It uses VDD as its internal reference, enabling 0 V to VDD input range and eliminating external reference components. Serial interface operation is SPI/QSPI/MICROWIRE/DSP-compatible, with configurable daisy-chain mode and channel/mode identifier bits embedded in the 16-bit DOUT stream.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for precision measurement of analog sensor or control signals. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients up to ~500 kHz Nyquist-limited bandwidth. |
| SNR | 71 dB min at 100 kHz - enables >11.5 effective number of bits (ENOB) in mid-frequency signal capture. |
| Channel Isolation | 90 dB typ - ensures minimal crosstalk between VIN0 and VIN1 during simultaneous or interleaved sampling. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - allows continuous high-speed operation in thermally constrained portable devices. |
| Standby Current | 1 µA max - supports ultra-low-power sleep states without losing configuration or requiring reinitialization. |
| Input Range | 0 V to VDD - simplifies front-end design by eliminating level-shifting or biasing circuitry for single-supply systems. |
Pinout & Package
AD7922ARM is available in an 8-lead TSOT package (2.0 mm × 2.3 mm, 0.5 mm pitch), optimized for compact PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial data output | Provides 16-bit frame: two leading zeros + channel ID + mode bit + 12-bit MSB-first result; three-state controlled by CS. |
| CS | Active-low chip select | Initiates sampling on falling edge; frames serial transfer; controls power-down entry/exit and daisy-chain enable. |
| SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 18 MHz for 1 MSPS operation. |
| DIN | Serial data input | Accepts channel selection (VIN0/VIN1) on third MSB during conversion setup; sampled on SCLK falling edge. |
| VIN0, VIN1 | Analog input channels | Single-ended, multiplexed inputs referenced to GND; support 0–VDD range with ±0.3 µA leakage and 20 pF capacitance. |
| GND | Analog ground | Primary reference for analog circuitry and input signals; must be separated from digital ground per layout guidelines. |
| VDD | Power supply | Single 2.35–5.25 V rail powers analog core, digital logic, and internal reference; no external reference required. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, one-shot conversion control via CS - critical for time-critical trigger-based acquisition. |
| Daisy-chain mode | Allows cascading multiple AD7922ARM units on shared SCLK/CS lines, reducing GPIO count and simplifying multi-channel expansion. |
| VDD-referenced conversion | Eliminates need for external voltage reference or buffer, reducing BOM cost and board area in single-supply systems. |
| Flexible clock management | Supports variable SCLK frequencies (10 kHz–18 MHz); throughput scales linearly with clock rate without firmware changes. |
| Low acquisition time | 290 ns track-and-hold acquisition enables accurate sampling of fast-rising signals even with high source impedance. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of ECG, pulse oximetry, or temperature in handheld diagnostic tools powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog front-end outputs with synchronized sampling and minimal power overhead. Use Value: 1 µA standby current and 6 mW active power at 3 V extend battery life while maintaining 12-bit resolution for clinical-grade accuracy. |
Use Scenario: Multi-sensor environmental monitoring (voltage, current, temperature) in unattended field-deployed equipment. IC Role / Device Role / Timing Role: Centralized analog acquisition node interfacing with microcontroller over SPI, supporting scheduled burst sampling. Use Value: Daisy-chain capability allows up to 8+ channels using only 4 MCU pins, reducing interconnect complexity and PCB routing layers. |
| Optical Sensor Interfaces | High-Speed Modem Front Ends |
Use Scenario: Digitizing photodiode or ambient light sensor outputs in smart lighting or gesture recognition systems. IC Role / Device Role / Timing Role: High-SNR ADC capturing low-amplitude, wide-bandwidth optical signals with minimal added noise. Use Value: 71 dB SNR at 100 kHz and 90 dB channel isolation preserve signal integrity when multiplexing across photodetector arrays. |
Use Scenario: Baseband signal conditioning in DSL or PLC modems requiring precise analog waveform reconstruction. IC Role / Device Role / Timing Role: Dual-input sampling of differential analog receive paths with tight timing alignment and low jitter. Use Value: 30 ps aperture jitter and 10 ns aperture delay ensure accurate phase coherence for symbol-level demodulation algorithms. |
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 | 4-channel, same 12-bit resolution and 1 MSPS rate; uses external reference; MSOP-10 package. | Requires external reference and additional decoupling; better suited for systems needing >2 analog inputs without daisy-chaining. | Select AD7923BRMZ when expanding beyond two channels and board space permits larger footprint and reference circuitry. |
| ADS7822U | 12-bit, single-channel, 200 kSPS max; SPI-compatible; 8-pin SOIC; requires external reference and VREF decoupling. | Limited to one input per device; lower throughput restricts use to slower control-loop or supervisory sampling. | Choose ADS7822U only for cost-sensitive, low-channel-count designs where 1 MSPS is unnecessary and layout simplicity outweighs performance. |
Compared with AD7922ARM, AD7923BRMZ offers higher channel density but adds reference dependency and package size, while ADS7822U trades speed and dual-channel capability for lower unit cost and simpler layout - making AD7922ARM optimal for balanced performance, integration, and power in compact dual-sensor systems.
Availability
AD7922ARM is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, optical sensor interfaces, and high-speed modem front ends requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7922ARM 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 targets low-power, high-speed data acquisition in space- and energy-constrained systems - emphasizing integration, single-supply operation, and robust serial interfacing for embedded sensor nodes and portable instrumentation.
FAQ
What is the maximum sampling rate supported by the AD7922ARM?
The AD7922ARM supports a maximum throughput rate of 1 MSPS, achieved with an SCLK frequency of up to 18 MHz and 16 clock cycles per conversion. At lower SCLK speeds (e.g., 5 MHz), the throughput scales proportionally - for example, ~315 kSPS - while maintaining full 12-bit accuracy and no pipeline delay. This flexibility allows matching sample rate to system requirements without changing hardware.
Does the AD7922ARM require an external voltage reference?
No, the AD7922ARM uses its VDD supply as the internal reference, supporting a 0 V to VDD analog input range. This eliminates the need for external reference ICs, decoupling capacitors, or trimming circuitry - reducing BOM count and PCB area. Reference stability is directly tied to VDD regulation quality, so a clean, low-noise supply is recommended for best SNR performance.
How does the daisy-chain mode work on the AD7922ARM?
In daisy-chain mode, multiple AD7922ARM devices share the same CS and SCLK lines, with DOUT of one device connected to DIN of the next. A single 16-bit read cycle retrieves results from all chained devices sequentially. The mode is enabled by holding CS low across multiple conversions and relies on internal shift-register synchronization - no additional control signals or firmware overhead are required beyond standard SPI framing.
What is the channel-to-channel isolation specification for the AD7922ARM?
The AD7922ARM provides 90 dB typical channel-to-channel isolation, measured by applying a full-scale 20–500 kHz sine wave to the unselected input while digitizing a 10 kHz signal on the selected channel. This high isolation ensures minimal crosstalk during simultaneous or rapid interleaved sampling of VIN0 and VIN1 - critical for differential measurements or independent sensor monitoring without hardware guard bands.
Can the AD7922ARM operate from a 2.5 V supply?
Yes, the AD7922ARM is fully specified for operation from 2.35 V to 5.25 V. At 2.5 V, it maintains 1 MSPS throughput, 71 dB SNR (min), and 12-bit linearity with ±1.5 LSB INL max. Power dissipation drops to ~4.5 mW typical, and standby current remains ≤1 µA - making it ideal for coin-cell or energy-harvesting systems where low-voltage operation is mandatory.
AD7922ARM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7922ARM FAQ
1.How can I place an order for AD7922ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922ARM 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 AD7922ARM reliable?
The price and inventory of AD7922ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922ARM is usually 5 days.
3.What payment methods are accepted for AD7922ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922ARM?
AD7922ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922ARM 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 AD7922ARM?
For technical support, including AD7922ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922ARM requirements.
6.How does Aetrix verify that AD7922ARM is sourced from the original manufacturer or authorized distributors?
All AD7922ARM 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 AD7922ARM meets industry standards.
7.What is the process for return or replacement of AD7922ARM?
All AD7922ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7922ARM, 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 AD7922ARM part is unused and in its original packaging.
Return procedure for AD7922ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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