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Analog Devices Inc. AD7922AUJ-REEL
- Part No.:
- AD7922AUJ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
AD7922AUJ-REEL.pdf
- Description:
- IC ADC DUAL 12BIT 2CH TSOT-23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
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Product details
Overview
AD7922AUJ-REEL from Analog Devices is a 12-bit, dual-channel, successive approximation analog-to-digital converter (ADC) operating at up to 1 MSPS with single-supply voltage range 2.35 V to 5.25 V. It features 71 dB minimum SNR at 100 kHz input, ±1.5 LSB max integral nonlinearity, and channel-to-channel isolation of 90 dB - enabling high-fidelity signal acquisition in space-constrained battery-powered instrumentation.
For engineers reviewing the AD7922AUJ-REEL datasheet, AD7922AUJ-REEL pinout, AD7922AUJ-REEL application, or AD7922AUJ-REEL equivalent, key selection considerations include its TSOT-8 package, SPI/QSPI/MICROWIRE-compatible serial interface, daisy-chain capability, no-pipeline-delay architecture, and internal VDD-referenced conversion - all critical for low-latency, multi-sensor embedded data acquisition systems.
Technical Context
The AD7922AUJ-REEL implements a true successive approximation register (SAR) ADC architecture with a wide-bandwidth track-and-hold amplifier supporting >6 MHz input frequencies. Conversion is initiated on the falling edge of CS, synchronized to SCLK, with no pipeline latency and deterministic 888 ns max conversion time (16 SCLK cycles at 18 MHz).
It operates in Normal, Power-Down, and Daisy-Chain modes. Channel selection is performed via DIN during CS assertion, and output data includes channel ID and mode bits before the 12-bit result (MSB-first). Reference is internally derived from VDD, enabling full-scale 0 V to VDD analog input range without external reference components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part-in-4096 quantization granularity for precision sensor and control loop feedback. |
| Throughput Rate | 1 MSPS - supports real-time sampling of fast transients in motor control or optical sensing applications. |
| SNR | 71 dB min at 100 kHz - enables clean digitization of medium-bandwidth signals such as ECG waveforms or vibration spectra. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1 in simultaneous dual-signal monitoring (e.g., differential temperature + pressure). |
| Power Dissipation | 6 mW max at 3 V / 1 MSPS - allows continuous high-speed operation in energy-sensitive portable medical devices. |
| Aperture Jitter | 30 ps typ - limits sampling uncertainty to <0.05% of LSB at 100 kHz, preserving dynamic accuracy. |
| Input Range | 0 V to VDD - eliminates need for level-shifting circuitry when interfacing with rail-to-rail sensors or op-amp outputs. |
Pinout & Package
AD7922AUJ-REEL is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.55 mm), optimized for compact PCB layouts in handheld and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIN) | Data Input | Serial control line accepting channel select bit on falling SCLK edge; enables dynamic VIN0/VIN1 switching per conversion. |
| 2 (SCLK) | Serial Clock | Master clock governing both data transfer timing and internal SAR conversion cycle; supports up to 18 MHz. |
| 3 (CS) | Chip Select | Active-low signal initiating sample acquisition on falling edge and framing serial data output window. |
| 4 (DOUT) | Data Output | Three-state serial output delivering 16-bit frame: two leading zeros + channel ID + mode bit + 12-bit result (MSB first). |
| 5 (VDD) | Power Supply | Single 2.35–5.25 V supply powering analog core, digital interface, and internal reference - no auxiliary rails required. |
| 6 (GND) | Analog Ground | Dedicated ground reference for analog front-end; must be star-connected to minimize noise coupling into VIN0/VIN1. |
| 7 (VIN0) | Analog Input 0 | Single-ended input channel with 20 pF input capacitance and ±0.3 µA leakage - compatible with low-output-impedance sensors. |
| 8 (VIN1) | Analog Input 1 | Second independent single-ended input; matched offset/gain error (<±0.5 LSB) enables ratiometric dual-sensor measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Daisy-chain mode | Enables cascading multiple AD7922AUJ-REEL units on one SPI bus - reduces GPIO count and simplifies synchronization in multi-node sensor arrays. |
| No pipeline delay | Delivers deterministic latency: conversion completes within fixed 888 ns after CS fall - essential for closed-loop control timing budgets. |
| Flexible power management | 1 µA max standby current and dynamic power-down mode allow adaptive throughput scaling - e.g., 100 kSPS operation draws only 0.28 mA at 3 V. |
| Internal VDD reference | Eliminates external reference IC and associated layout complexity while maintaining full-scale linearity across 2.35–5.25 V supply range. |
| SPI/QSPI/MICROWIRE/DSP compatibility | Interoperates with industry-standard microcontrollers (e.g., STM32, C2000, TMS320) without protocol translation logic or firmware abstraction layers. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Simultaneous acquisition of ECG lead I and II signals in handheld cardiac monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Dual-channel SAR ADC performing synchronized 1 MSPS sampling with <1 µs inter-channel skew and integrated digital framing. Use Value: 71 dB SNR preserves diagnostic waveform fidelity; 6 mW power at 3 V extends runtime; TSOT-8 footprint enables ultra-thin device form factor. |
Use Scenario: Environmental monitoring node logging temperature, humidity, and barometric pressure using discrete analog sensors. IC Role / Device Role / Timing Role: Low-power dual-input ADC converting two sensor outputs alternately under microcontroller SPI control with automatic channel ID tagging. Use Value: 90 dB channel isolation prevents cross-talk between thermistor and capacitive humidity readings; 1 µA standby current minimizes quiescent drain. |
| Industrial Motor Control Feedback | Optical Sensor Signal Conditioning |
Use Scenario: Real-time current and voltage sensing in BLDC inverter gate drivers for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: High-speed dual ADC capturing phase current and DC bus voltage with deterministic 888 ns conversion latency and no pipeline bubbles. Use Value: 1 MSPS throughput meets FOC loop timing requirements; ±1.5 LSB INL ensures accurate torque estimation; daisy-chain support scales to 3-phase systems. |
Use Scenario: Digitizing outputs from photodiode and ambient light sensors in smart lighting or gesture recognition modules. IC Role / Device Role / Timing Role: Dual-input ADC handling wide-dynamic-range analog signals (e.g., 10 nA–100 µA photocurrents) with programmable gain stage interfacing. Use Value: 0–VDD input range accommodates transimpedance amplifier outputs directly; 71 dB SNR resolves low-light signal details; TSOT-8 eases optical alignment on compact PCBs. |
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-REEL | 10-bit resolution, 61 dB SINAD min, lower power (4.8 mW @ 3 V), identical pinout and interface. | Lower precision suffices for cost-sensitive industrial controls where 10-bit resolution meets system accuracy targets. | Select AD7912AUJ-REEL when 10-bit resolution and reduced power consumption outweigh SNR and dynamic range requirements. |
| ADS7822U | 12-bit, 200 kSPS max, SPI-only interface, SO-8 package, higher 12.5 mW power at 5 V, no daisy-chain mode. | Targeted at lower-throughput applications like panel meters or HVAC controllers where 1 MSPS is unnecessary. | Choose ADS7822U only if legacy SO-8 footprint compatibility or simplified SPI timing (no CS-controlled sampling instant) is prioritized over speed and scalability. |
Compared with AD7922AUJ-REEL, AD7912AUJ-REEL trades 2 bits of resolution and 10 dB SNR for ~25% lower power and identical integration; ADS7822U sacrifices throughput, daisy-chain capability, and TSOT size for broader vendor support and simpler timing - making AD7922AUJ-REEL optimal for high-fidelity, space-constrained, multi-node systems.
Availability
AD7922AUJ-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, industrial motor control feedback loops, and optical sensor signal conditioning requiring stable component supply and long-term production continuity.
Supply support for AD7922AUJ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7922AUJ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, high-speed, multi-channel data acquisition in portable and embedded systems where accuracy, size, and energy efficiency are co-optimized.
FAQ
What is the maximum sampling rate supported by the AD7922AUJ-REEL?
The AD7922AUJ-REEL supports a maximum throughput rate of 1 MSPS, achieved with an SCLK frequency of up to 18 MHz and 16 serial clock 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, with conversion time fixed at 888 ns max - enabling deterministic timing for real-time control applications.
Does the AD7922AUJ-REEL require an external voltage reference?
No, the AD7922AUJ-REEL uses an internal reference derived from the VDD supply, supporting a full-scale analog input range of 0 V to VDD. This eliminates the need for external reference ICs, reduces BOM count, and simplifies layout - while maintaining ±1.5 LSB max integral nonlinearity and 71 dB SNR performance across the 2.35 V to 5.25 V VDD range.
How does the daisy-chain mode function on the AD7922AUJ-REEL?
In daisy-chain mode, multiple AD7922AUJ-REEL devices share a single SPI bus: DOUT of one device connects to DIN of the next, with common SCLK and CS lines. A single CS assertion triggers simultaneous sampling across all devices, and results are shifted out sequentially - enabling synchronized multi-channel acquisition without additional GPIOs or timing complexity.
What package type is used for the AD7922AUJ-REEL?
The AD7922AUJ-REEL is supplied in an 8-lead TSOT (Thin Small Outline Transistor) package measuring 2.1 mm × 1.6 mm × 0.55 mm. This ultra-compact, surface-mount package supports high-density PCB layouts in space-constrained applications such as wearable health monitors and miniaturized industrial sensors - and is pin-compatible with the MSOP-8 variant of the same device family.
What is the channel-to-channel isolation specification for the AD7922AUJ-REEL?
The AD7922AUJ-REEL provides 90 dB typical channel-to-channel isolation, measured by applying a full-scale 20 kHz–500 kHz sine wave to the unselected input while digitizing a 10 kHz signal on the selected channel. This high isolation ensures minimal crosstalk between VIN0 and VIN1 - critical for accurate simultaneous measurement of independent analog sources like dual thermocouples or differential sensor pairs.
AD7922AUJ-REEL 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-REEL FAQ
1.How can I place an order for AD7922AUJ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7922AUJ-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 AD7922AUJ-REEL reliable?
The price and inventory of AD7922AUJ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7922AUJ-REEL is usually 5 days.
3.What payment methods are accepted for AD7922AUJ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7922AUJ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7922AUJ-REEL?
AD7922AUJ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7922AUJ-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 AD7922AUJ-REEL?
For technical support, including AD7922AUJ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7922AUJ-REEL requirements.
6.How does Aetrix verify that AD7922AUJ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7922AUJ-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 AD7922AUJ-REEL meets industry standards.
7.What is the process for return or replacement of AD7922AUJ-REEL?
All AD7922AUJ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7922AUJ-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 AD7922AUJ-REEL part is unused and in its original packaging.
Return procedure for AD7922AUJ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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