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Analog Devices Inc. AD7912ARM
- Part No.:
- AD7912ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7912ARM.pdf
- Description:
- IC ADC DUAL 10BIT 2CH 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,162
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Product details
Overview
AD7912ARM from Analog Devices is a 10-bit, 2-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 typ. It serves as a high-speed data acquisition front-end in portable medical instruments and battery-powered PDA systems.
For engineers reviewing the AD7912ARM datasheet, AD7912ARM pinout, AD7912ARM application, or AD7912ARM equivalent, this page delivers verified specifications, TSOT-8/MSOP-8 package mapping, daisy-chain interface support, and real-world design values for low-power, dual-channel sampling in space-constrained embedded systems.
Technical Context
The AD7912ARM implements a track-and-hold amplifier with 290 ns max 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 synchronized to SCLK, supporting SPI/QSPI/MICROWIRE/DSP-compatible serial interfaces.
It uses internal VDD-referenced conversion, eliminating external reference components, and supports three operational modes-normal, power-down (1 µA max), and daisy-chain-via DIN-controlled configuration. Channel selection and mode identification are embedded in the serial output stream (two leading zeros + CHN bit + MOD bit + 10-bit data + two trailing zeros).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for medium-precision sensor or control loop feedback. |
| Throughput Rate | 1 MSPS - enables real-time capture of fast transients in optical sensors or modem receive paths. |
| SNR @ 100 kHz | 71 dB min - ensures ≥9 effective bits of dynamic range for clean digitization of audio-band and instrumentation signals. |
| Channel Isolation | 90 dB typ - prevents crosstalk between VIN0 and VIN1 in simultaneous-sampling applications like dual-sensor monitoring. |
| Power @ 3 V / 1 MSPS | 6 mW max - allows continuous high-speed operation in coin-cell–powered devices without thermal derating. |
| Supply Range | 2.35 V to 5.25 V - supports direct interfacing with Li-ion, 3.3 V, and 5 V logic domains without level-shifting. |
| Power-Down Current | 1 µA max - enables microamp-level sleep states in wake-on-event data loggers. |
Pinout & Package
AD7912ARM is available in an 8-lead TSOT package (3 mm × 1.7 mm, 0.65 mm pitch) and an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch). Both packages share identical pin functions and signal routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DOUT | Serial data output | Delivers 14-bit frame (2 leading zeros + CHN + MOD + 10-bit result + 2 trailing zeros) on SCLK falling edges; supports daisy-chain readout. |
| CS | Active-low chip select | Initiates conversion on falling edge and frames serial transfer; enables multi-device sharing of SCLK/DIN lines. |
| 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) and mode control bits on SCLK falling edges; enables dynamic channel switching. |
| VIN0 / VIN1 | Analog input channels | Single-ended inputs referenced to GND, 0 V to VDD range; multiplexed into shared track-and-hold amplifier. |
| GND | Analog ground | Primary reference for analog circuitry and input signals; must be isolated from digital return paths to preserve SNR. |
| VDD | Power supply | Single supply powering analog core, digital interface, and internal reference; also serves as ADC reference voltage. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, one-shot conversion timing critical for time-triggered control loops and synchronized sampling. |
| Daisy-chain mode | Allows cascading multiple AD7912ARM units on one SPI bus, reducing GPIO count and PCB routing complexity in multi-channel systems. |
| Flexible clock management | Conversion rate scales linearly with SCLK frequency (10 kHz–18 MHz), permitting dynamic throughput adjustment without firmware changes. |
| VDD-referenced conversion | Eliminates need for external reference IC or resistor divider, reducing BOM cost and layout area in compact portable designs. |
| Low acquisition time | 290 ns max track-and-hold acquisition enables accurate sampling of fast-rising signals even with high source impedance. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG and temperature sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Dual-channel ADC performing synchronized sampling of analog biosignals at ≤1 MSPS with minimal power draw. Use Value: 90 dB channel isolation prevents cross-coupling between biopotential and thermal channels; 1 µA power-down current extends battery life during idle periods. |
Use Scenario: Long-term environmental monitoring using paired thermistor and humidity sensors in remote field nodes. IC Role / Device Role / Timing Role: Low-power, precision ADC converting two analog sensor outputs per wake cycle in intermittent-sampling mode. Use Value: VDD-referenced architecture eliminates external reference drift; 6 mW operational power at 3 V enables >1-year operation on AA batteries. |
| Optical Sensor Interfaces | Industrial PDA Front-Ends |
Use Scenario: Digitizing photodiode and ambient light sensor outputs in smart lighting controllers. IC Role / Device Role / Timing Role: High-SNR ADC capturing fast transient light pulses while rejecting noise from PWM-driven LEDs. Use Value: 71 dB SNR at 100 kHz preserves signal integrity in noisy switching environments; 8.5 MHz full-power bandwidth captures rapid intensity changes. |
Use Scenario: Signal conditioning for barcode scanner and touchscreen controller analog front-ends in ruggedized PDAs. IC Role / Device Role / Timing Role: Compact, dual-input ADC handling touch panel voltage gradients and scan engine analog feedback simultaneously. Use Value: TSOT-8 footprint saves board space; SPI compatibility simplifies integration with ARM-based application processors. |
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 |
|---|---|---|---|
| AD7922ARM | 12-bit resolution, 70 dB SINAD min, higher gain/offset error match specs, same pinout and interface. | Required where >10-bit precision is needed for high-fidelity sensor fusion or calibration-critical measurements. | Select AD7922ARM when system accuracy demands ≥12-bit linearity and SNR >70 dB; retains identical layout and firmware compatibility. |
| ADS7822U | 12-bit, 200 kSPS max, SPI interface, 3.3 V only, no daisy-chain mode, 10 µA standby current. | Suitable for lower-throughput, fixed-voltage industrial I/O modules where daisy-chaining is unnecessary. | Choose ADS7822U for cost-sensitive, non-battery applications with relaxed speed and isolation requirements; requires PCB redesign due to different pinout. |
Compared with AD7922ARM and ADS7822U, the AD7912ARM uniquely balances 10-bit precision, 1 MSPS speed, ultra-low power-down current, and daisy-chain capability in a sub-3 mm² TSOT package-making it optimal for space- and energy-constrained dual-channel acquisition.
Availability
AD7912ARM is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, optical sensor interfaces, and industrial PDA front-ends requiring stable component supply across production lifecycles.
Supply support for AD7912ARM 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 AD7912ARM belongs to the AD79xx family of low-power, high-speed SAR ADCs designed specifically for battery-operated and space-constrained data acquisition systems demanding precision, flexibility, and minimal power overhead.
FAQ
What is the maximum sample rate supported by the AD7912ARM?
The AD7912ARM supports a maximum throughput rate of 1 MSPS under specified conditions: VDD = 2.35 V to 5.25 V, fSCLK = 18 MHz, and TA = −40°C to +85°C. This rate is achieved using 14 SCLK cycles per conversion. At lower clock frequencies, the throughput scales proportionally-for example, 500 kSPS at 9 MHz SCLK-enabling flexible trade-offs between speed and power in the AD7912ARM design.
Does the AD7912ARM require an external voltage reference?
No, the AD7912ARM uses an internal reference derived from VDD, eliminating the need for an external reference IC or resistor network. This simplifies layout and reduces BOM count. The full-scale input range is 0 V to VDD, and performance specifications-including SNR and INL-are guaranteed across the 2.35 V to 5.25 V supply range. This architecture is integral to the AD7912ARM's suitability for compact, low-cost portable systems.
How does the daisy-chain mode work on the AD7912ARM?
In daisy-chain mode, multiple AD7912ARM devices connect serially: DOUT of one device drives DIN of the next, while sharing common CS and SCLK lines. Each AD7912ARM appends its 14-bit result to the chain, allowing all conversions to be read out in one SPI transaction. This mode reduces GPIO usage and simplifies firmware for multi-channel systems-critical for scalable sensor arrays where minimizing interconnects is essential in the AD7912ARM implementation.
What is the channel-to-channel isolation specification for the AD7912ARM?
The AD7912ARM 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 high isolation ensures minimal crosstalk between VIN0 and VIN1, making the AD7912ARM appropriate for simultaneous sampling of independent analog sources-such as dual-sensor monitoring in medical or industrial equipment-without signal corruption.
Can the AD7912ARM operate from a 2.5 V supply?
Yes, the AD7912ARM 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 SNR minimum at 100 kHz, and 1 µA max power-down current. Input range becomes 0 V to 2.5 V, and logic thresholds adjust automatically (e.g., VINH = 0.7 × VDD = 1.75 V min). This wide supply tolerance makes the AD7912ARM compatible with diverse battery chemistries and LDO outputs in real-world deployments.
AD7912ARM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 10
- 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:
- -
AD7912ARM FAQ
1.How can I place an order for AD7912ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7912ARM 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 AD7912ARM reliable?
The price and inventory of AD7912ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7912ARM is usually 5 days.
3.What payment methods are accepted for AD7912ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7912ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7912ARM?
AD7912ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7912ARM 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 AD7912ARM?
For technical support, including AD7912ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7912ARM requirements.
6.How does Aetrix verify that AD7912ARM is sourced from the original manufacturer or authorized distributors?
All AD7912ARM 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 AD7912ARM meets industry standards.
7.What is the process for return or replacement of AD7912ARM?
All AD7912ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7912ARM, 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 AD7912ARM part is unused and in its original packaging.
Return procedure for AD7912ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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