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Analog Devices Inc. AD7811YRU-REEL7
- Part No.:
- AD7811YRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7811YRU-REEL7.pdf
- Description:
- IC ADC 10BIT 4-CHAN SRL 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:115
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Product details
Overview
AD7811YRU-REEL7 from Analog Devices is a 10-bit, 4-channel, successive-approximation ADC with 350 kSPS throughput, on-chip 2.5 V ±2.5% reference, and DSP/microcontroller-compatible serial interface. It operates from a single 2.7 V to 5.5 V supply, consumes 3.5 mA typical in normal operation, and supports pseudo-differential or single-ended input configurations for industrial sensor signal conditioning.
For engineers reviewing the AD7811YRU-REEL7 datasheet, AD7811YRU-REEL7 pinout, AD7811YRU-REEL7 application, or AD7811YRU-REEL7 equivalent, key selection considerations include its 2.3 µs conversion time, 16-pin TSSOP package with A0 address pin for multi-device bus sharing, channel-to-channel isolation of –80 dB, and automotive-qualified operation from –40°C to +105°C.
Technical Context
The AD7811YRU-REEL7 implements a charge redistribution DAC architecture with integrated track-and-hold, enabling precise sampling of analog inputs across four configurable channels. Its control register (10-bit, write-only) allows dynamic reconfiguration of input mode (single-ended vs. pseudo-differential), channel selection, power-down state, and external reference enable via the EXTREF bit.
Timing is synchronized by an internal oscillator; conversion initiates on the falling edge of CONVST and completes in ≤2.3 µs, with track/hold acquisition time ≤200 ns. The serial interface uses three-wire frame-sync (RFS/TFS) and SCLK, supporting simultaneous read/write operations and dual-device bus arbitration via the A0 pin and control register address bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes over full temperature range |
| Sampling Rate | 350 kSPS - enables real-time capture of signals up to ~30 kHz bandwidth |
| Conversion Time | 2.3 µs max - defines minimum inter-conversion interval in high-speed sequencing |
| On-Chip Reference | 2.5 V ±2.5% - eliminates need for external reference in cost-sensitive designs |
| Supply Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic/system rails |
| Power Consumption | 10.5 mW max at 3 V - scales down to 315 µW at 10 kSPS via automatic power-down |
| Channel Isolation | –80 dB typ - ensures minimal crosstalk between adjacent inputs in multiplexed sensing |
Pinout & Package
AD7811YRU-REEL7 is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP), RU-16 footprint, 4.4 mm × 5.0 mm × 1.2 mm, with exposed pad for thermal performance. Pin 1 marked via dot; pins numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Accepts external reference (1.2 V to VDD) or connects to VDD; EXTREF bit must be set to enable |
| CREF (Pin 2) | Reference Decoupling | Requires 10 nF capacitor to ground to stabilize internal 2.5 V reference and reduce noise |
| VIN1–VIN4 (Pins 3,5–7) | Analog Inputs | Support single-ended (vs. AGND) or pseudo-differential (e.g., VIN1–VIN4) configuration via control register |
| AGND (Pin 4) | Analog Ground | Separate ground return for track/hold, comparator, DAC, and reference-must tie to DGND at single point |
| A0 (Pin 8) | Package Address | Hardware-selectable device ID; enables two AD7811/AD7812 devices to share one serial bus |
| DGND (Pin 9) | Digital Ground | Ground reference for serial interface and control logic; tied to AGND at package level |
| TFS (Pin 10) | Transmit Frame Sync | Falling edge initiates 10-bit control byte load; required before each configuration or channel change |
| RFS (Pin 11) | Receive Frame Sync | Rising edge enables serial data output counter; used for DSP compatibility and bus arbitration |
| DOUT (Pin 12) | Serial Data Output | 3-state output; drives data on SCLK rising edge, enters high-Z after 11th clock pulse |
| DIN (Pin 13) | Serial Data Input | Loads 10-bit control word on SCLK falling edges; requires 13 clocks for full write cycle |
| SCLK (Pin 14) | Serial Clock | External clock source; timing-critical for both input latching and output sampling |
| CONVST (Pin 15) | Convert Start | Falling-edge-triggered; initiates conversion and determines post-conversion power state |
| VDD (Pin 16) | Supply Voltage | 2.7 V to 5.5 V single supply; powers analog and digital sections; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Input Architecture | Four single-ended or three pseudo-differential (vs. VIN4) or two independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4) |
| Integrated Reference Management | On-chip 2.5 V ±2.5% reference automatically disabled when EXTREF = 1, reducing current by ~1 mA |
| Multi-Device Serial Bus Sharing | A0 pin + control register address bit enables hardware-selectable addressing for up to two devices on shared RFS/TFS/SCLK lines |
| Low-Power Throughput Scaling | Auto power-down reduces IDD from 3.5 mA to 1 µA (full) or 350 µA (partial), with 1.5 µs wake-up time |
| Automotive-Qualified Operation | Specified from –40°C to +105°C with guaranteed performance, meeting AEC-Q100 stress test requirements |
Applications
| Industrial Sensor Interface | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and current sensors in PLC I/O modules with limited board space and power budget. IC Role / Device Role / Timing Role: 4-channel front-end ADC digitizing analog sensor outputs at ≤100 kSPS, using internal reference and auto power-down between samples. Use Value: Eliminates external reference and reduces BOM count; 2.3 µs conversion enables tight loop timing in closed-loop control. |
Use Scenario: Sampling phase currents and DC bus voltage in 3-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Simultaneous acquisition of multiple analog feedback signals with channel-to-channel isolation >80 dB to prevent cross-coupling errors. Use Value: Pseudo-differential mode rejects common-mode noise from switching transients; TSSOP package fits compact gate-driver PCB layouts. |
| Automotive Body Electronics | Portable Medical Instrumentation |
|
Use Scenario: Cabin environment monitoring (HVAC sensors, seat occupancy, ambient light) in automotive body control modules. IC Role / Device Role / Timing Role: Low-power 10-bit ADC operating from 3.3 V rail, leveraging partial power-down mode during idle periods to extend system battery life. Use Value: Automotive qualification ensures reliability under vibration, thermal cycling, and ESD stress; 16-pin TSSOP simplifies automated assembly. |
Use Scenario: Battery-powered patient monitors acquiring ECG, SpO₂, and respiration waveforms with moderate resolution and low noise. IC Role / Device Role / Timing Role: High SNR (58 dB) and low THD (–66 dB) ADC capturing biopotential signals without external amplification stage. Use Value: On-chip track-and-hold and 200 ns acquisition time support accurate sampling of fast-rising physiological events; small RU-16 footprint saves PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7812YRU-REEL7 | 8-channel variant in same RU-20 package; identical timing, reference, and interface architecture | Required when >4 analog inputs must be sampled without external MUX | Select AD7812YRU-REEL7 only if additional channel count justifies larger footprint and higher pin count |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, 8-pin SOIC; no on-chip reference; requires external REF | Better resolution but lower speed and no internal reference-increases BOM and layout complexity | Choose ADS7822U only when 12-bit precision outweighs added component count and reduced throughput |
Compared with AD7811YRU-REEL7, AD7812YRU-REEL7 offers double the channel count at the cost of larger RU-20 packaging and increased routing density, while ADS7822U trades off speed and integration for higher resolution-neither is pin-compatible, and both require PCB redesign and firmware adaptation.
Availability
AD7811YRU-REEL7 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7811YRU-REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7811YRU-REEL7 belongs to Analog Devices' legacy SAR ADC product line, designed specifically for cost-sensitive, low-power, multi-channel data acquisition in industrial and automotive systems where integration, small footprint, and guaranteed no-missing-codes performance are critical.
FAQ
What is the maximum sampling rate supported by the AD7811YRU-REEL7?
The AD7811YRU-REEL7 supports a maximum sampling rate of 350 kSPS, corresponding to a minimum conversion time of 2.3 µs. This rate is achievable across all four input channels when configured in single-ended mode and powered from 2.7 V to 5.5 V. At lower throughput rates (e.g., 10 kSPS), the device enters automatic power-down mode, reducing power consumption to 315 µW while maintaining full 10-bit accuracy and no missing codes.
Does the AD7811YRU-REEL7 require an external reference voltage?
No, the AD7811YRU-REEL7 includes an on-chip 2.5 V ±2.5% reference that is enabled by default. An external reference (1.2 V to VDD) may be used by setting the EXTREF bit in the control register and connecting it to the VREF pin. When EXTREF = 1, the internal reference circuitry powers down, reducing total supply current by approximately 1 mA-this is confirmed in the Power Supply section of the datasheet.
How many analog input channels does the AD7811YRU-REEL7 support, and how are they configured?
The AD7811YRU-REEL7 supports four analog input channels (VIN1–VIN4), configurable via its 10-bit control register as either four single-ended inputs referenced to AGND, three pseudo-differential inputs referenced to VIN4, or two independent pseudo-differential pairs (VIN1/VIN2 and VIN3/VIN4). Configuration is determined by the DIF/SGL and VIN4/AGND bits, with channel selection controlled by CH1/CH0 bits-details are fully specified in Table I of the AD7811/AD7812 datasheet.
Is the AD7811YRU-REEL7 compatible with standard SPI interfaces?
The AD7811YRU-REEL7 uses a proprietary three-wire serial interface (RFS, TFS, SCLK) optimized for DSP and microcontroller compatibility-not standard SPI. It lacks dedicated CS/SS and MOSI/MISO lines. RFS acts as frame sync for reads, TFS for writes, and SCLK provides clocking. While software-emulated SPI can drive it, hardware SPI peripherals require careful timing alignment and cannot use native SPI modes without protocol translation.
What package type is used for the AD7811YRU-REEL7, and what are its key mechanical dimensions?
The AD7811YRU-REEL7 is supplied in a 16-lead Thin Shrink Small Outline Package (TSSOP), designated RU-16. Its body dimensions are 4.4 mm × 5.0 mm × 1.2 mm, with 0.65 mm lead pitch and exposed thermal pad. This package supports fine-pitch surface-mount assembly and provides improved thermal performance over SOIC or DIP variants, as documented in the Ordering Guide and Package Information sections of the datasheet.
AD7811YRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 350k
- 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 ~ 105°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7811YRU-REEL7 FAQ
1.How can I place an order for AD7811YRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7811YRU-REEL7 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 AD7811YRU-REEL7 reliable?
The price and inventory of AD7811YRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7811YRU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7811YRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7811YRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7811YRU-REEL7?
AD7811YRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7811YRU-REEL7 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 AD7811YRU-REEL7?
For technical support, including AD7811YRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7811YRU-REEL7 requirements.
6.How does Aetrix verify that AD7811YRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7811YRU-REEL7 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 AD7811YRU-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7811YRU-REEL7?
All AD7811YRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7811YRU-REEL7, 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 AD7811YRU-REEL7 part is unused and in its original packaging.
Return procedure for AD7811YRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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