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Analog Devices Inc. AD7922ARMZ-REEL7
- Part No.:
- AD7922ARMZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7922ARMZ-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
AD7922ARMZ-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. It delivers 1 MSPS throughput, 71 dB minimum SNR at 100 kHz input, and features daisy-chain capability for multi-ADC systems in portable instrumentation and battery-powered data acquisition.
For engineers reviewing the AD7922ARMZ-REEL7 datasheet, AD7922ARMZ-REEL7 pinout, AD7922ARMZ-REEL7 application, or AD7922ARMZ-REEL7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for volume production in embedded sensing and industrial monitoring.
Technical Context
The AD7922ARMZ-REEL7 uses 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 on the falling edge of CS and clocked by SCLK, supporting SPI/QSPI/MICROWIRE/DSP interfaces.
It implements channel selection via DIN (third MSB), outputs serial data with channel and mode identifier bits, and supports daisy-chain mode for cascaded readout. Internal VDD-referenced conversion eliminates external reference components while maintaining 0 V to VDD input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity signal digitization in precision sensor interfaces. |
| Throughput Rate | 1 MSPS - enables real-time capture of fast transients in motor control feedback or optical sensor burst modes. |
| SNR | 71 dB min at 100 kHz - ensures clean digitization of low-amplitude AC signals in medical instrument front-ends. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1 in dual-sensor monitoring (e.g., temperature + pressure). |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - extends battery life in portable PDA or handheld diagnostic devices. |
| Standby Current | 1 µA max - allows ultra-low-power wake-on-event operation in always-on IoT sensor nodes. |
| Input Range | 0 V to VDD - simplifies analog front-end design by eliminating level-shifting circuitry for single-supply systems. |
Pinout & Package
AD7922ARMZ-REEL7 is packaged in an 8-lead TSOT (Thin Small Outline Transistor) with 0.5 mm pitch, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial data output | Provides 14-bit frame (2 leading zeros + CHN bit + MOD bit + 12-bit MSB-first result); three-state controlled by CS. |
| CS | Chip select (active low) | Initiates conversion on falling edge and frames serial transfer; controls DOUT three-state enable/disable timing. |
| SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 18 MHz for 1 MSPS operation. |
| DIN | Data input | Accepts channel selection (VIN0/VIN1) on third MSB during SCLK falling edge; enables dynamic channel switching. |
| VIN0, VIN1 | Analog input channels | Single-ended inputs multiplexed into shared track-and-hold; each supports 0–VDD range with ±0.3 µA leakage. |
| GND | Analog ground | Reference node for all analog circuitry; must be isolated from digital ground to preserve SNR performance. |
| VDD | Power supply | Single 2.35–5.25 V rail powers analog and digital sections; also serves as internal reference voltage source. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, one-shot conversion timing critical for closed-loop control where latency must be bounded and predictable. |
| Daisy-chain mode | Allows synchronous readout of multiple AD7922ARMZ-REEL7 devices using a single SCLK/CS pair-reducing MCU GPIO count in multi-channel DAQ systems. |
| Flexible power management | Full power-down mode draws ≤1 µA static current; dynamic power scales linearly with throughput, enabling adaptive energy use in duty-cycled sensors. |
| Wide supply range | Operates from 2.35 V to 5.25 V without performance degradation-supports direct integration with Li-ion, USB, or industrial 3.3/5 V rails. |
| High channel isolation | 90 dB typical crosstalk rejection permits simultaneous measurement of high-gain and low-gain signals (e.g., ECG + respiration) on same device. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Simultaneous acquisition of ECG and SpO₂ analog signals in handheld patient monitors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two independent physiological waveforms with synchronized sampling and <1 µs inter-channel skew. Use Value: Eliminates need for two separate ADCs or external multiplexer, reducing BOM cost and board area while preserving signal integrity via 90 dB channel isolation. |
Use Scenario: Field-deployable environmental sensor node logging temperature, humidity, and light intensity. IC Role / Device Role / Timing Role: ADC samples two sensor outputs at 1 MSPS, then enters 1 µA standby between bursts to maximize battery runtime. Use Value: 6 mW operational power at 3 V enables >1 year operation on two AA cells in 10-second sampling intervals. |
| Industrial Motor Control Feedback | Optical Sensor Interface |
Use Scenario: Real-time current and voltage sensing in BLDC motor inverters for field-oriented control. IC Role / Device Role / Timing Role: Digitizes phase current (VIN0) and DC bus voltage (VIN1) with 1 MSPS throughput and no pipeline latency. Use Value: Deterministic 888 ns conversion time enables precise PWM synchronization and fast overcurrent response within 1 µs window. |
Use Scenario: High-speed photodiode or CCD array readout in barcode scanners or laser distance meters. IC Role / Device Role / Timing Role: Captures fast-rising optical pulses with 71 dB SNR at 100 kHz and 8.5 MHz full-power bandwidth. Use Value: Wide input bandwidth and low aperture jitter (30 ps typ) preserve pulse shape fidelity for accurate time-of-flight calculation. |
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 |
|---|---|---|---|
| AD7912ARMZ-REEL7 | 10-bit resolution, identical package/pinout/interface, 61 dB SINAD min, lower power (4.8 mW @ 3 V) | Lower precision suitable for cost-sensitive industrial control where 10-bit resolution suffices | Select when system SNR requirements are ≤61 dB and BOM cost reduction is prioritized over resolution |
| ADS8325IDGSR | 16-bit, 100 kSPS max, SPI interface, external reference required, 8-lead MSOP package | Higher resolution but slower speed; requires external reference and separate power sequencing | Choose only if 16-bit accuracy is mandatory and 100 kSPS throughput is acceptable; not drop-in compatible |
Compared with AD7922ARMZ-REEL7, AD7912ARMZ-REEL7 trades 2 bits of resolution for lower power and cost in less demanding applications, while ADS8325IDGSR offers higher resolution at significantly reduced speed and increased system complexity-neither is pin-compatible nor functionally interchangeable without redesign.
Availability
AD7922ARMZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data acquisition systems, and industrial motor control feedback requiring stable component supply across extended production lifecycles.
Supply support for AD7922ARMZ-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.
The AD7922ARMZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-throughput data acquisition in portable and space-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the AD7922ARMZ-REEL7?
The AD7922ARMZ-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz SCLK and 16 SCLK cycles per conversion. This rate is guaranteed across the full −40°C to +85°C operating temperature range and 2.35 V to 5.25 V supply voltage range, making AD7922ARMZ-REEL7 suitable for real-time signal capture in demanding embedded environments.
Does the AD7922ARMZ-REEL7 require an external voltage reference?
No, the AD7922ARMZ-REEL7 uses an internal reference derived from VDD, enabling a full-scale input range of 0 V to VDD without external components. This simplifies design and reduces bill-of-materials cost, and is explicitly confirmed in the General Description and Specifications sections of the official AD7912/AD7922 datasheet Rev. 0.
Can the AD7922ARMZ-REEL7 interface directly with an SPI host controller?
Yes, the AD7922ARMZ-REEL7 is fully SPI-compatible, supporting standard SPI, QSPI, MICROWIRE, and DSP serial protocols. Its CS, SCLK, DIN, and DOUT pins align with SPI timing conventions-including data sampled on SCLK falling edges-and require no protocol translation logic when interfacing with microcontrollers such as STM32 or TI C2000 series.
What is the purpose of the channel identifier bit in the AD7922ARMZ-REEL7 serial output?
The channel identifier bit in the AD7922ARMZ-REEL7 serial data stream (bit position 11 in the 14-bit frame) explicitly indicates whether the transmitted 12-bit result corresponds to VIN0 or VIN1. This allows unambiguous identification of source channel in daisy-chain or multi-conversion sequences, eliminating software ambiguity and ensuring correct data alignment in dual-sensor applications.
How does the power-down mode of the AD7922ARMZ-REEL7 reduce system energy consumption?
In full power-down mode, the AD7922ARMZ-REEL7 draws ≤1 µA static current (typically 50 nA), reducing quiescent power by >99.9% compared to active operation. This state retains register settings and allows fast wake-up (<1 µs power-up time), making AD7922ARMZ-REEL7 ideal for duty-cycled sensor nodes where acquisition occurs intermittently to extend battery life.
AD7922ARMZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7922ARMZ-REEL7 FAQ
1.How can I place an order for AD7922ARMZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922ARMZ-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 AD7922ARMZ-REEL7 reliable?
The price and inventory of AD7922ARMZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922ARMZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7922ARMZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922ARMZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922ARMZ-REEL7?
AD7922ARMZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922ARMZ-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 AD7922ARMZ-REEL7?
For technical support, including AD7922ARMZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922ARMZ-REEL7 requirements.
6.How does Aetrix verify that AD7922ARMZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7922ARMZ-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 AD7922ARMZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7922ARMZ-REEL7?
All AD7922ARMZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7922ARMZ-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 AD7922ARMZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7922ARMZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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