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Analog Devices Inc. AD7922ARMZ
- Part No.:
- AD7922ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7922ARMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
AD7922ARMZ 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 AD7922ARMZ datasheet, AD7922ARMZ pinout, AD7922ARMZ application, or AD7922ARMZ equivalent, this page delivers verified specifications, TSOT-8 package mapping, daisy-chain interface behavior, power-down mode current (1 µA max), and real-world SNR/THD performance at 1 MSPS - all critical for low-power, multi-channel signal digitization.
Technical Context
The AD7922ARMZ implements a true successive approximation register (SAR) architecture with no pipeline delay, enabling deterministic conversion timing controlled by CS and SCLK edges. Its track-and-hold amplifier supports full-power bandwidth up to 8.5 MHz and acquisition time ≤290 ns.
It uses internal VDD-referenced conversion, eliminating external reference components, and features SPI/QSPI/MICROWIRE/DSP-compatible serial interface with channel identifier and mode bits embedded in the 16-bit DOUT stream (two leading zeros + CHN bit + MOD bit + 12-bit data).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VDD / 4096 quantization step, enabling precise measurement of small analog signals in 0–VDD range. |
| Throughput Rate | 1 MSPS maximum - supports real-time sampling of signals up to ~400 kHz Nyquist bandwidth without aliasing. |
| SNR | 71 dB minimum at 100 kHz input - ensures ≥11.8 effective number of bits (ENOB) for clean signal reconstruction. |
| Channel Isolation | 90 dB typical - prevents crosstalk between VIN0 and VIN1, critical for simultaneous dual-sensor acquisition. |
| Power (3 V, 1 MSPS) | 6 mW maximum - enables continuous high-speed sampling in energy-constrained systems like handheld diagnostics. |
| Power-Down Current | 1 µA maximum - reduces idle power by >99.9% versus active mode, extending battery life between conversions. |
| Aperture Jitter | 30 ps typical - limits sampling uncertainty to <0.01 LSB at 100 kHz, preserving dynamic accuracy. |
Pinout & Package
AD7922ARMZ is housed in an 8-lead TSOT package (2.0 mm × 2.3 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts in portable electronics. Thermal impedance θJA = 207°C/W supports operation up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial data output | Three-state logic output delivering 16-bit frame (2×0 + CHN + MOD + 12-bit MSB-first data) on SCLK falling edge; requires pull-up for bus sharing. |
| CS | Chip select | Active-low input initiating conversion and framing serial transfer; falling edge samples analog input and starts conversion sequence. |
| SCLK | Serial clock | Input clock driving both data I/O and internal ADC timing; supports 10 kHz–18 MHz range; determines throughput rate directly. |
| DIN | Data input | Configures selected channel (VIN0/VIN1) via third MSB on falling SCLK edge; enables dynamic channel switching per conversion. |
| VIN0 / VIN1 | Analog inputs | Single-ended, multiplexed inputs referenced to GND; accept 0–VDD range; input capacitance 20 pF affects anti-alias filter design. |
| GND | Analog ground | Common reference for all analog circuitry; must be isolated from digital ground to minimize noise coupling into conversion path. |
| VDD | Supply voltage | Single 2.35–5.25 V rail powering analog core, digital interface, and internal reference; also serves as ADC reference source. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables immediate readout after conversion completion - eliminates latency uncertainty in closed-loop control or trigger-based acquisition. |
| Daisy-chain mode | Allows cascading multiple AD7922ARMZ devices on one SPI bus; DOUT of upstream feeds DIN of downstream, reducing GPIO count in multi-ADC systems. |
| VDD-referenced conversion | Removes need for external reference IC or resistor divider, simplifying BOM and layout while maintaining full-scale range scalability with supply. |
| Flexible clock management | Throughput scales linearly with SCLK frequency (10 kHz–18 MHz); permits dynamic trade-off between speed and power in variable-rate applications. |
| 1 µA standby current | Supports ultra-low-power wake-on-event architectures - device consumes <1 µW in full power-down, ideal for intermittent sensing nodes. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Simultaneous acquisition of ECG lead signals and temperature sensor output in handheld diagnostic tools. IC Role / Device Role / Timing Role: Dual-channel SAR ADC performing synchronized sampling of two analog biosignals with deterministic 1 MSPS timing and <300 ns acquisition window. Use Value: 90 dB channel isolation prevents cross-coupling between high-gain biopotential and low-drift thermal channels, ensuring clinical-grade fidelity. |
Use Scenario: Long-duration environmental monitoring using solar-charged Li-ion battery and multi-sensor array (pressure, humidity, acceleration). IC Role / Device Role / Timing Role: Low-power ADC managing duty-cycled sampling bursts at 1 MSPS, then entering 1 µA standby until next wake interval. Use Value: 6 mW operational power at 3 V enables >100 hours of continuous logging per charge cycle without thermal derating. |
| Industrial Handheld Testers | Optical Sensor Interfaces |
Use Scenario: Compact multimeter measuring AC/DC voltage, current, and resistance with auto-ranging and dual-input capability. IC Role / Device Role / Timing Role: Precision dual-channel front-end digitizing differential and single-ended inputs with matched gain/offset error (±0.2 LSB typ). Use Value: Gain error match ≤0.2 LSB ensures consistent scaling across ranges, eliminating calibration drift between channels during autoranging. |
Use Scenario: High-bandwidth photodiode signal conditioning in optical smoke detectors or fiber-optic receivers. IC Role / Device Role / Timing Role: Wide-input-bandwidth ADC capturing fast transient pulses from photodetectors with 71 dB SNR at 100 kHz. Use Value: 8.5 MHz full-power bandwidth preserves pulse shape integrity for accurate peak detection and timing analysis. |
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 | 10-bit resolution, lower SNR (61 dB min), identical pinout, same TSOT-8 package and serial interface protocol. | Lower precision requirements; cost-sensitive designs where 10-bit ENOB suffices (e.g., basic sensor monitoring). | Select AD7912ARMZ when system SNR budget allows ≤10-bit effective resolution and BOM cost reduction is prioritized over dynamic range. |
| ADS7822U | 12-bit, single-channel, 200 kSPS max, 3 V only, different SPI framing (no CHN/MOD bits), SO-8 package. | Lower throughput and single-input constraint; suitable for simpler, non-simultaneous acquisition tasks. | Choose ADS7822U only if dual-channel operation is unnecessary and 200 kSPS meets timing needs - not a drop-in replacement due to channel count and timing mismatch. |
Compared with AD7922ARMZ, AD7912ARMZ trades 2-bit resolution and 10 dB SNR for lower cost and identical footprint, while ADS7822U sacrifices channel count, speed, and interface compatibility to reduce complexity - making AD7922ARMZ the sole option for space-constrained, high-fidelity dual-channel 1 MSPS acquisition.
Availability
AD7922ARMZ is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, and industrial handheld testers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7922ARMZ 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 AD79xx family was designed specifically for low-power, high-speed, multi-channel data acquisition in portable and energy-sensitive systems - emphasizing integration, minimal external components, and robust serial interfacing.
FAQ
What is the maximum sample rate supported by the AD7922ARMZ?
The AD7922ARMZ supports a maximum throughput rate of 1 MSPS, achieved with an SCLK frequency of 18 MHz and 16 SCLK cycles per conversion. At lower SCLK frequencies (e.g., 5 MHz), the throughput scales down proportionally - for example, to ~315 kSPS - while maintaining full 12-bit accuracy and deterministic timing. This rate is confirmed in Table 2 and Figure 7 of the AD7912/AD7922 Rev. 0 datasheet.
Does the AD7922ARMZ require an external voltage reference?
No, the AD7922ARMZ uses an internal reference derived from the VDD supply, supporting full-scale input ranges from 0 V to VDD. This eliminates the need for external reference ICs or precision dividers, simplifying design and reducing board area. The reference is inherently ratiometric, meaning ADC codes scale linearly with VDD variations - a feature explicitly stated in the General Description and Functional Block Diagram sections.
How does the daisy-chain mode work on the AD7922ARMZ?
In daisy-chain mode, multiple AD7922ARMZ devices share one SPI bus: the DOUT of the first device connects to the DIN of the second, and so on. A single CS assertion initiates simultaneous conversions across all devices, and serial readout occurs sequentially - the first 16 bits correspond to the last device in chain, followed by the prior device's data. This mode is documented in Sections "Daisy-Chain Mode" and "Daisy-Chain Example" (Pages 20–22) of the datasheet.
What is the channel-to-channel isolation specification for the AD7922ARMZ?
The AD7922ARMZ provides 90 dB typical channel-to-channel isolation, measured by applying a full-scale sine wave (20 kHz–500 kHz) to the unselected input while digitizing a 10 kHz signal on the selected channel. This value is specified in both the AD7922 Specifications table (Page 5) and Terminology section (Page 11), ensuring minimal crosstalk in simultaneous dual-sensor applications such as ECG lead pairs or differential pressure sensing.
Can the AD7922ARMZ operate from a 2.5 V supply?
Yes, the AD7922ARMZ is fully specified for operation from 2.35 V to 5.25 V, including 2.5 V. At 2.5 V, it maintains 1 MSPS throughput, 71 dB minimum SNR at 100 kHz, and 1 µA max power-down current. DC accuracy parameters (e.g., offset error ±1 LSB max, gain error ±2 LSB max) remain guaranteed across this entire range, as confirmed in Table 2 under "A Grade" conditions.
AD7922ARMZ 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:
- 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 FAQ
1.How can I place an order for AD7922ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922ARMZ 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 reliable?
The price and inventory of AD7922ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922ARMZ is usually 5 days.
3.What payment methods are accepted for AD7922ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922ARMZ?
AD7922ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922ARMZ 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?
For technical support, including AD7922ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922ARMZ requirements.
6.How does Aetrix verify that AD7922ARMZ is sourced from the original manufacturer or authorized distributors?
All AD7922ARMZ 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 meets industry standards.
7.What is the process for return or replacement of AD7922ARMZ?
All AD7922ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7922ARMZ, 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 part is unused and in its original packaging.
Return procedure for AD7922ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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