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Analog Devices Inc. AD7922ARMZ-REEL
- Part No.:
- AD7922ARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7922ARMZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
AD7922ARMZ-REEL 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. It features 71 dB minimum SNR at 100 kHz input, channel-to-channel isolation of 90 dB typ, and daisy-chain capability for multi-ADC systems. It serves in high-speed, low-power data acquisition within portable medical instruments and battery-powered instrumentation.
For engineers reviewing the AD7922ARMZ-REEL datasheet, AD7922ARMZ-REEL pinout, AD7922ARMZ-REEL application, or AD7922ARMZ-REEL equivalent, key selection considerations include its 12-bit resolution with ±1.5 LSB INL max, 8-lead TSOT package, SPI/QSPI/MICROWIRE-compatible serial interface, and guaranteed no missing codes across full 12-bit range.
Technical Context
The AD7922ARMZ-REEL implements a true successive approximation register (SAR) architecture with no pipeline delay, enabling deterministic conversion timing controlled by CS and SCLK. Sampling is initiated on the falling edge of CS, and conversion completes in 888 ns max (16 SCLK cycles at 18 MHz), with track-and-hold acquisition time ≤290 ns.
It uses an internal VDD-referenced ADC core, eliminating external reference components, and supports flexible power management via full power-down mode (1 µA max static current). Its daisy-chain mode enables synchronized readout from multiple AD7922 devices using a single serial bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 1 LSB = VDD/4096 quantization step, supporting precise measurement of small analog signal variations. |
| Throughput Rate | 1 MSPS - enables real-time sampling of signals up to ~400 kHz (Nyquist-limited), suitable for fast transient capture. |
| SNR | 71 dB min at 100 kHz - ensures ≥11.8 effective number of bits (ENOB) for clean digitization of medium-frequency sensor outputs. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1, critical for simultaneous dual-sensor monitoring without interference. |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - allows integration into energy-constrained designs such as handheld diagnostics or wireless sensor nodes. |
| INL | ±1.5 LSB max (VDD = 2.35–3.6 V) - guarantees monotonicity and predictable transfer function error across full temperature range (−40°C to +85°C). |
| Package | 8-lead TSOT - 3 mm × 1.7 mm footprint with exposed pad, optimized for space-constrained PCB layouts and thermal performance. |
Pinout & Package
AD7922ARMZ-REEL is housed in an 8-lead Thin Small Outline Transistor (TSOT) package with exposed thermal pad. Pin numbering follows top-view orientation with pin 1 at bottom-left corner (DIN), progressing counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 1) | Serial data input | Selects active analog channel (VIN0/VIN1) and operation mode via third MSB; clocked on SCLK falling edge. |
| SCLK (Pin 2) | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 18 MHz for 1 MSPS operation. |
| CS (Pin 3) | Chip select (active low) | Initiates conversion and frames serial data; falling edge triggers sampling and conversion start. |
| DOUT (Pin 4) | Serial data output | Outputs 16-bit stream: two leading zeros + channel ID + mode bit + 12-bit result (MSB first); three-state when CS high. |
| VIN1 (Pin 7) | Analog input channel 1 | Single-ended input referenced to GND; accepts 0 V to VDD range; multiplexed with VIN0 into shared T/H amplifier. |
| VIN0 (Pin 8) | Analog input channel 0 | Single-ended input identical to VIN1; channel selection determined by DIN during CS assertion. |
| GND (Pin 6) | Analog ground | Primary reference for analog circuitry and input signals; must be connected to low-impedance system ground plane. |
| VDD (Pin 5) | Power supply | Single 2.35–5.25 V supply powering analog core, digital interface, and internal reference; also serves as ADC reference. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | True SAR architecture provides deterministic latency (≤888 ns), essential for closed-loop control and time-critical sampling decisions. |
| Daisy-chain mode | Enables cascaded readout of multiple AD7922 devices using one SCLK/CS pair, reducing GPIO count and simplifying multi-channel expansion. |
| VDD-referenced conversion | Eliminates need for external voltage reference, lowering BOM cost and board area while maintaining dynamic range scalability with supply. |
| Low-power standby | 1 µA max shutdown current extends battery life in intermittent-sampling applications like portable data loggers or wearable monitors. |
| Flexible supply range | Operates from 2.35 V to 5.25 V, supporting direct connection to Li-ion, 3.3 V, or 5 V rails without LDO regulation overhead. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Simultaneous ECG and respiration waveform capture in handheld patient monitors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two analog biosignals with synchronized sampling and minimal inter-channel crosstalk. Use Value: 90 dB channel isolation prevents respiratory artifact from corrupting ECG baseline; 12-bit resolution captures microvolt-level ST-segment shifts. |
Use Scenario: Field-deployable environmental sensor node logging temperature, humidity, and pressure. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC interfacing with multiple analog sensors via multiplexed inputs. Use Value: 6 mW max power at 3 V enables >1-year battery life; daisy-chain support allows future expansion to 4+ channels without redesign. |
| Optical Sensor Interface | Industrial Control Loop Monitoring |
Use Scenario: Digitizing photodiode current outputs in optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: High-SNR ADC capturing fast light-pulse responses with wide input bandwidth (>6 MHz). Use Value: 71 dB SNR at 100 kHz preserves signal integrity from low-light conditions; 8.5 MHz full-power bandwidth supports pulsed LED drive schemes. |
Use Scenario: Real-time monitoring of motor current and temperature feedback in embedded PLC modules. IC Role / Device Role / Timing Role: Deterministic-latency ADC feeding FPGA-based PID controllers requiring precise sample alignment. Use Value: No pipeline delay ensures exact 1 µs sampling interval; CS-controlled sampling enables tight synchronization with PWM switching events. |
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 |
|---|---|---|---|
| AD7923BRMZ | 12-bit, 1 MSPS, but uses external reference and requires separate VREF pin; no VDD-referenced mode. | Requires additional reference IC and decoupling; less suitable for ultra-low-BOM-count portable designs. | Choose AD7923BRMZ only if absolute accuracy across varying VDD or ratiometric rejection is required. |
| ADS7822U | 12-bit, 200 kSPS max, SPI-compatible, but single-channel only; no daisy-chain or dual-input capability. | Lacks simultaneous dual-channel sampling; throughput insufficient for 1 MSPS system requirements. | Consider ADS7822U only for cost-sensitive, lower-speed single-sensor applications where channel count and speed are relaxed. |
Compared with AD7922ARMZ-REEL, AD7923BRMZ trades integrated reference simplicity for higher reference flexibility, while ADS7822U sacrifices speed and channel count for lower unit cost-neither offers the same combination of 1 MSPS, dual-channel, VDD-referenced, and daisy-chain functionality.
Availability
AD7922ARMZ-REEL 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 AD7922ARMZ-REEL 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7922ARMZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the AD7922ARMZ-REEL?
The AD7922ARMZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with an SCLK frequency of up to 18 MHz and 16 SCLK cycles per conversion. This rate is fully specified across the −40°C to +85°C operating temperature range and all valid VDD levels (2.35 V to 5.25 V). At lower SCLK frequencies, the throughput scales linearly-for example, 5 MHz SCLK yields ~315 kSPS.
Does the AD7922ARMZ-REEL require an external voltage reference?
No, the AD7922ARMZ-REEL uses an internal VDD-referenced ADC architecture, meaning the supply voltage (VDD) serves directly as the reference. This eliminates the need for external reference components, reduces BOM count, and simplifies layout-though it implies that ADC full-scale range tracks VDD variations. The device does not support external reference input.
How is channel selection implemented on the AD7922ARMZ-REEL?
Channel selection on the AD7922ARMZ-REEL is performed via the DIN pin: the third most significant bit (MSB) of the serial data written during CS assertion determines whether VIN0 or VIN1 is sampled. This occurs before conversion begins, and the selected channel's result is identified by a dedicated channel ID bit in the DOUT serial stream.
What package type is used for the AD7922ARMZ-REEL?
The AD7922ARMZ-REEL is packaged in an 8-lead Thin Small Outline Transistor (TSOT) package, measuring 3.0 mm × 1.7 mm with 0.5 mm lead pitch and an exposed thermal pad. This package is distinct from the MSOP variant (AD7922ARMZ) and is optimized for compact, thermally efficient PCB layouts in portable equipment.
Can multiple AD7922ARMZ-REEL devices be connected in series for synchronized readout?
Yes, the AD7922ARMZ-REEL supports daisy-chain mode: DOUT of one device connects to DIN of the next, with shared SCLK and CS lines. In this configuration, a single 16-bit serial frame reads conversion results from all chained devices sequentially, preserving timing alignment and minimizing interface complexity in multi-channel systems.
AD7922ARMZ-REEL 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-REEL FAQ
1.How can I place an order for AD7922ARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922ARMZ-REEL 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-REEL reliable?
The price and inventory of AD7922ARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922ARMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7922ARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922ARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922ARMZ-REEL?
AD7922ARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922ARMZ-REEL 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-REEL?
For technical support, including AD7922ARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922ARMZ-REEL requirements.
6.How does Aetrix verify that AD7922ARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7922ARMZ-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD7922ARMZ-REEL?
All AD7922ARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7922ARMZ-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD7922ARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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