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Analog Devices Inc. AD7911ARM
- Part No.:
- AD7911ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7911ARM.pdf
- Description:
- IC ADC 10BIT DUAL 250KSPS 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
AD7911ARM 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, delivering 250 kSPS throughput with 61 dB SINAD at 100 kHz input and ±0.5 LSB integral nonlinearity - used in portable medical instruments and battery-powered data acquisition systems requiring low-power, dual-channel sampling.
For engineers reviewing the AD7911ARM datasheet, AD7911ARM pinout, AD7911ARM application, or AD7911ARM equivalent, this page delivers verified technical context, package-specific pin functions, real-world use scenarios, and validated alternative options - all grounded in Analog Devices' Rev. A specification for the 8-lead TSOT variant.
Technical Context
The AD7911ARM implements a true successive approximation architecture with no pipeline delay, using CS-controlled sampling on its falling edge and SCLK-synchronized conversion timing. Its internal track-and-hold amplifier supports >6 MHz input bandwidth and achieves 290 ns acquisition time.
It uses VDD as the internal reference source, enabling a full-scale analog input range of 0 V to VDD, and features SPI/QSPI/MICROWIRE/DSP-compatible serial interface with channel identifier bit in the DOUT stream - supporting dynamic channel selection via DIN during conversion setup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes per channel, sufficient for medium-precision sensor digitization in portable instrumentation. |
| Throughput Rate | 250 kSPS maximum - enables real-time sampling of signals up to ~125 kHz Nyquist bandwidth without aliasing in continuous acquisition mode. |
| SINAD @ 100 kHz | 61 dB min - corresponds to ~10.1 effective bits, confirming usable dynamic range for audio-band and biomedical signal capture. |
| Supply Range | 2.35 V to 5.25 V - allows direct interfacing with Li-ion (3.0–4.2 V), 3.3 V, and 5 V logic domains without external regulators. |
| Power (3 V / 250 kSPS) | 6 mW max - enables <10 μA average current draw in duty-cycled systems, critical for multi-day PDA or wearable sensor operation. |
| Channel Isolation | −90 dB typ - ensures minimal crosstalk between VIN0 and VIN1, preserving independent measurement integrity in dual-sensor applications. |
| Conversion Time | 2.8 μs max (14 SCLK cycles @ 5 MHz) - defines minimum inter-conversion interval and supports tight timing control in synchronized systems. |
Pinout & Package
AD7911ARM is packaged in an 8-lead TSOT (Thin Small Outline Transistor) with 0.5 mm pitch, optimized for space-constrained PCB layouts in handheld devices. Thermal impedance θJA = 207°C/W supports operation up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN | Serial data input | Accepts channel-select command on falling SCLK edge; determines whether VIN0 or VIN1 is converted next. |
| SCLK | Serial clock input | Drives both data transfer and internal ADC conversion timing; supports up to 5 MHz for full 250 kSPS operation. |
| CS | Chip select (active low) | Initiates sampling on falling edge and frames serial data transaction; enables multi-device SPI bus sharing. |
| DOUT | Serial data output | Outputs 10-bit result with two leading zeros, channel ID bit, invalid bit, and MSB-first format - no external framing required. |
| VDD | Power supply | Single 2.35–5.25 V rail powers analog core, reference, and digital interface; serves as internal reference voltage. |
| GND | Analog ground | Common reference for VIN0/VIN1 inputs and internal circuitry; must be separated from digital ground in mixed-signal layout. |
| VIN0 | Analog input channel 0 | Single-ended input referenced to GND; accepts 0 V to VDD range; multiplexed into shared track-and-hold amplifier. |
| VIN1 | Analog input channel 1 | Single-ended input identical to VIN0; channel-to-channel isolation ≥90 dB prevents interference during interleaved sampling. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic, one-shot conversion timing - critical for time-triggered control loops and synchronized multi-ADC systems. |
| VDD-referenced conversion | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area in cost-sensitive designs. |
| Flexible power management | 1 μA max standby current and dynamic power-down mode allow >100× reduction in idle power versus active operation. |
| SPI-compatible serial interface | Direct connection to ARM Cortex-M, MSP430, or DSP microcontrollers without level-shifting or protocol translation logic. |
| Wide input bandwidth | 8.5 MHz full-power bandwidth supports accurate digitization of fast transients and high-frequency sensor outputs (e.g., piezoelectric accelerometers). |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Simultaneous ECG lead and temperature monitoring in handheld diagnostic device powered by single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-channel ADC samples analog front-end outputs with precise channel synchronization and minimal power overhead. Use Value: 250 kSPS throughput captures QRS complex morphology while 61 dB SINAD preserves diagnostic fidelity; 6 mW at 3 V extends battery life beyond 48 hours. |
Use Scenario: Field-deployable environmental sensor node measuring soil moisture and ambient light with intermittent wireless transmission. IC Role / Device Role / Timing Role: Low-power ADC acquires two sensor signals during wake-up bursts, then enters 1 μA standby until next trigger. Use Value: VDD-referenced full-scale range simplifies sensor biasing; −90 dB channel isolation prevents cross-talk between resistive and photodiode channels. |
| Optical Sensor Interface | Industrial Handheld Tester |
Use Scenario: Compact optical spectrometer using dual photodiode array with correlated double sampling. IC Role / Device Role / Timing Role: Successive approximation ADC performs matched-gain sampling on reference and signal photodiodes within same conversion cycle. Use Value: ±0.3 LSB offset error match and ±0.3 LSB gain error match enable sub-0.1% ratiometric accuracy without calibration. |
Use Scenario: Portable multimeter with simultaneous voltage and current measurement capability using shunt and divider networks. IC Role / Device Role / Timing Role: Dual-input ADC digitizes isolated analog paths with guaranteed no-missed-codes behavior across full 10-bit range. Use Value: 0 to VDD input range accommodates ±2.5 V differential measurements via external op-amp; 290 ns acquisition time supports fast settling after multiplexer switching. |
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 |
|---|---|---|---|
| AD7921ARM | 12-bit resolution, 70 dB SINAD, higher power (20 mW @ 5 V), identical pinout and interface | Used where higher dynamic range is required (e.g., vibration analysis), not suitable for ultra-low-power budget constraints | Select AD7921ARM only when 12-bit precision and >70 dB SNR are mandatory; otherwise AD7911ARM offers better power efficiency for 10-bit needs. |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 2.7–5.25 V supply, but single-channel only and no channel ID bit in DOUT | Requires external multiplexer for dual-signal acquisition, increasing component count and timing complexity | Choose ADS7822U only if system already uses external MUX and prioritizes 12-bit resolution over integrated dual-channel simplicity. |
Compared with AD7921ARM and ADS7822U, the AD7911ARM uniquely balances 10-bit precision, true dual-channel integration, and sub-10 μA standby current - making it optimal for space- and energy-constrained portable instrumentation where 12-bit resolution is unnecessary.
Availability
AD7911ARM is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data acquisition, optical sensor interfaces, and industrial handheld testers requiring stable component supply and long-term manufacturability.
Supply support for AD7911ARM 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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD7911ARM belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, dual-channel data acquisition in portable and battery-operated systems - emphasizing integration, supply flexibility, and timing determinism.
FAQ
What is the maximum sampling rate supported by the AD7911ARM?
The AD7911ARM supports a maximum throughput rate of 250 kSPS under specified conditions (VDD = 2.35 V to 5.25 V, fSCLK = 5 MHz). This is achieved using 14 SCLK cycles per conversion, limiting minimum conversion time to 2.8 μs. At lower SCLK frequencies, throughput scales linearly - e.g., 2 MHz SCLK yields ~143 kSPS.
Does the AD7911ARM require an external voltage reference?
No, the AD7911ARM uses an internal reference derived from VDD, establishing a full-scale input range of 0 V to VDD. This eliminates the need for external reference components, simplifying design and reducing board area - confirmed in the Functional Block Diagram and General Description sections of the Rev. A datasheet.
How does channel selection work on the AD7911ARM?
Channel selection is performed via the DIN pin: a logic level applied to DIN before the falling edge of CS determines whether VIN0 or VIN1 is sampled. The DOUT stream includes a dedicated channel identifier bit, allowing unambiguous identification of which input was converted - a feature explicitly documented in the Pin Function Descriptions table.
What is the power consumption of the AD7911ARM in standby mode?
The AD7911ARM draws a maximum of 1 μA in full power-down mode, with typical current as low as 50 nA. This value is measured with SCLK inactive and applies across the full −40°C to +85°C temperature range - specified in the Power Requirements section of the AD7911 Specifications table (Page 4).
Is the AD7911ARM pin-compatible with the AD7921ARM?
Yes, the AD7911ARM and AD7921ARM share identical 8-lead TSOT and MSOP packages, pin assignments, electrical interface, and timing specifications - enabling drop-in replacement where 10-bit resolution suffices and lower power is preferred. This compatibility is confirmed in the Pin Configurations section (Figures 8 and 9) and Ordering Guide.
AD7911ARM 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:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 250k
- 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:
- -
AD7911ARM FAQ
1.How can I place an order for AD7911ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7911ARM 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 AD7911ARM reliable?
The price and inventory of AD7911ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7911ARM is usually 5 days.
3.What payment methods are accepted for AD7911ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7911ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7911ARM?
AD7911ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7911ARM 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 AD7911ARM?
For technical support, including AD7911ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7911ARM requirements.
6.How does Aetrix verify that AD7911ARM is sourced from the original manufacturer or authorized distributors?
All AD7911ARM 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 AD7911ARM meets industry standards.
7.What is the process for return or replacement of AD7911ARM?
All AD7911ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7911ARM, 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 AD7911ARM part is unused and in its original packaging.
Return procedure for AD7911ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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