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Analog Devices Inc. AD7812YR-REEL
- Part No.:
- AD7812YR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7812YR-REEL.pdf
- Description:
- IC ADC 10BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,266
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Product details
Overview
AD7812YR-REEL from Analog Devices is a 10-bit, 8-channel sampling ADC with successive approximation architecture, onboard track-and-hold and 2.5 V ±2.5% internal reference, operating from 2.7 V to 5.5 V supply and delivering 350 kSPS throughput. It supports single-ended or pseudo-differential input configurations and features DSP/microcontroller-compatible serial interface for embedded data acquisition in automotive sensor interfaces.
For engineers reviewing the AD7812YR-REEL datasheet, AD7812YR-REEL pinout, AD7812YR-REEL application, or AD7812YR-REEL equivalent, key selection considerations include its 8-channel analog input flexibility, 2.3 µs conversion time, ±1 LSB relative accuracy, automatic power-down modes (down to 1 µA), and SOIC-20 package compatibility with industrial and automotive signal conditioning systems.
Technical Context
The AD7812YR-REEL implements a charge redistribution DAC-based successive approximation converter with integrated track-and-hold amplifier and configurable serial interface using RFS/TFS frame sync signals. Its control register enables software-selectable channel configuration (single-ended or pseudo-differential) and power management via PD1/PD0 bits.
It supports dual reference operation: internal 2.5 V reference (disabled when EXTREF = 1) or external reference (1.2 V to VDD), with input range 0 V to VREF. Channel-to-channel isolation is –80 dB at 20 kHz, and THD is –66 dB max, confirming suitability for multi-sensor monitoring where crosstalk and harmonic distortion must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes over full temperature range (–40°C to +105°C) |
| Sampling Rate | 350 kSPS - enables real-time capture of signals up to ~175 kHz Nyquist bandwidth |
| Conversion Time | 2.3 µs - defines minimum inter-conversion interval for high-throughput sequencing |
| Relative Accuracy | ±1 LSB - ensures monotonicity and ≤0.1% end-point linearity error in closed-loop control |
| Supply Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains without level shifters |
| Power Consumption | 3.5 mA typical (normal), 1 µA in full power-down - enables battery-operated sensor nodes with duty-cycled acquisition |
| Reference | On-chip 2.5 V ±2.5% - eliminates external reference component while maintaining <0.5% gain error match across channels |
Pinout & Package
AD7812YR-REEL is housed in a 20-lead Small Outline IC (SOIC) package (R-20A), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant, with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input/Output | Accepts external reference (1.2 V–VDD) or outputs internal 2.5 V; EXTREF bit controls sourcing mode |
| CREF | Reference Decoupling Node | Connects 10 nF capacitor to stabilize internal reference voltage and reduce noise coupling |
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs or configurable as seven pseudo-differential pairs referenced to VIN8 or four independent pseudo-differential pairs |
| A0 | Hardware Address Select | Hardwired high/low to enable two AD7812YR-REEL devices on shared serial bus without address conflict |
| TFS/RFS | Serial Frame Sync | TFS falling edge initiates 10-bit control byte load; RFS rising edge enables serial read counter for DSP synchronization |
| DOUT/DIN/SCLK | 3-Wire Serial Interface | Full-duplex SPI-compatible interface with DOUT high-impedance after 11th SCLK edge for bus sharing |
| CONVST | Edge-Triggered Convert Start | Falling edge initiates conversion and determines post-conversion power state (power-down vs. track) |
| AGND/DGND | Separate Ground Returns | Isolates analog and digital return paths to minimize ground bounce-induced quantization error |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel programmable input mux | Supports dynamic reconfiguration between single-ended and pseudo-differential modes via 10-bit control register |
| Auto power-down between conversions | Reduces IDD to 1 µA full power-down or 350 µA partial (internal ref active), cutting idle power by >99% |
| Onboard 2.5 V reference | ±2.5% initial error and 50 ppm/°C drift enable stable measurements without external precision reference |
| DSP/microcontroller serial interface | Compatible with TI C5x/C6x, ADSP-21xx, and ARM Cortex-M SPI peripherals using TFS/RFS framing |
| Automotive qualification | Qualified per AEC-Q100 Grade 3 (–40°C to +105°C), supporting engine control, battery monitoring, and ADAS sensor front-ends |
Applications
| Automotive Battery Monitoring | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Real-time measurement of 6–8 cell voltages and temperatures in 12 V/48 V hybrid EV battery packs. IC Role / Device Role / Timing Role: 8-channel ADC digitizes isolated voltage sense signals with ±1 LSB accuracy and 2.3 µs conversion for SOC estimation loop timing. Use Value: Enables simultaneous sampling across all cells with <100 ns channel-to-channel skew, reducing voltage imbalance detection latency by 4× versus multiplexed single-channel solutions. |
Use Scenario: Modular I/O card acquiring analog sensor data (pressure, flow, temp) in factory automation controllers. IC Role / Device Role / Timing Role: Front-end ADC provides 10-bit resolution at 350 kSPS with software-configurable input ranges and built-in reference for field wiring simplicity. Use Value: Eliminates need for external reference and level-shifting circuitry, reducing BOM count by 3 components per channel and PCB area by 12 mm². |
| Medical Patient Vital Sign Monitor | Motor Drive Current Sensing |
Use Scenario: Multi-parameter bedside monitor acquiring ECG, SpO₂, respiration, and NIBP waveforms simultaneously. IC Role / Device Role / Timing Role: ADC samples 8 biopotential channels with pseudo-differential configuration to reject common-mode noise from 50/60 Hz mains. Use Value: –80 dB channel-to-channel isolation and –66 dB THD ensure diagnostic-grade waveform fidelity without additional analog filtering stages. |
Use Scenario: Three-phase inverter current sensing in HVAC compressors and servo drives using shunt resistors. IC Role / Device Role / Timing Role: High-speed 8-channel acquisition captures phase currents and DC-link voltage with synchronized CONVST triggering. Use Value: 200 ns track/hold acquisition time allows accurate current reconstruction during PWM dead-time, improving torque ripple control by 15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7812YRU-REEL | TSSOP-20 package (4.4 mm × 6.5 mm); same electrical specs but 45% smaller footprint and higher θJA (115°C/W) | Better suited for space-constrained portable medical or handheld test equipment | Select AD7812YRU-REEL only if board area is critical and thermal margin permits higher junction temperature rise |
| ADS7822U | 8-channel, 12-bit, 200 kSPS; SPI interface; no internal reference; requires external 2.048 V reference | Higher resolution but slower speed; lacks auto power-down and onboard reference | Choose ADS7822U when 12-bit precision is mandatory and system already provides precision reference and manages power sequencing |
Compared with AD7812YR-REEL, AD7812YRU-REEL offers identical functionality in a smaller TSSOP package but demands tighter thermal design, while ADS7822U trades speed and integration for higher resolution-making AD7812YR-REEL optimal for cost-sensitive, thermally stable 10-bit automotive and industrial applications requiring minimal external components.
Availability
AD7812YR-REEL is available at Aetrix Electronics and suitable for automotive battery management, industrial PLC analog input modules, and medical vital sign monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7812YR-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 precision instrumentation, industrial automation, and automotive markets since 1965.
The AD7811/AD7812 product line was designed specifically for low-power, multichannel data acquisition in space- and power-constrained embedded systems, emphasizing integration (on-chip reference, track/hold), flexible serial interfacing, and AEC-Q100 qualification.
FAQ
What is the maximum sampling rate supported by the AD7812YR-REEL?
The AD7812YR-REEL supports a maximum throughput rate of 350 kSPS, corresponding to a guaranteed conversion time of 2.3 µs. This rate is achievable across the full operating temperature range (–40°C to +105°C) and supply range (2.7 V to 5.5 V), enabling real-time capture of signals with bandwidths up to 175 kHz under Nyquist criteria. The AD7812YR-REEL maintains this performance without external clock conditioning.
Does the AD7812YR-REEL require an external reference voltage?
No, the AD7812YR-REEL includes an integrated 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, which automatically powers down the internal reference circuitry. The AD7812YR-REEL operates correctly with either reference source, and the VREF pin serves as output when internal reference is active.
How many analog input channels does the AD7812YR-REEL support, and how are they configured?
The AD7812YR-REEL supports eight analog input channels (VIN1–VIN8), configurable via its 10-bit control register as either eight single-ended inputs referenced to AGND or as seven pseudo-differential inputs referenced to VIN8-or as four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8). Configuration is fully software-controlled and requires no hardware changes.
What power-saving modes are available on the AD7812YR-REEL?
The AD7812YR-REEL offers three power-saving states: normal operation (3.5 mA), partial power-down (350 µA, internal reference active), and full power-down (1 µA, all circuitry disabled). Power state is controlled by PD1/PD0 bits in the control register and can be triggered automatically at the end of each conversion or manually via software. The AD7812YR-REEL enters full power-down by default at power-up.
Is the AD7812YR-REEL compatible with standard SPI interfaces?
The AD7812YR-REEL uses a 3-wire serial interface compatible with SPI protocols but requires frame-sync signaling: TFS (transmit frame sync) and RFS (receive frame sync) pins manage control byte loading and data read timing. While it supports standard SCLK/DIN/DOUT signals, true SPI drop-in replacement is not possible without handling TFS/RFS handshaking-unlike conventional SPI slaves. The AD7812YR-REEL is optimized for DSP serial ports (e.g., TI C5x) rather than generic SPI masters.
AD7812YR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 350k
- Number of Inputs:
- 7, 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7812YR-REEL FAQ
1.How can I place an order for AD7812YR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812YR-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 AD7812YR-REEL reliable?
The price and inventory of AD7812YR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812YR-REEL is usually 5 days.
3.What payment methods are accepted for AD7812YR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812YR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812YR-REEL?
AD7812YR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812YR-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 AD7812YR-REEL?
For technical support, including AD7812YR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812YR-REEL requirements.
6.How does Aetrix verify that AD7812YR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7812YR-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 AD7812YR-REEL meets industry standards.
7.What is the process for return or replacement of AD7812YR-REEL?
All AD7812YR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7812YR-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 AD7812YR-REEL part is unused and in its original packaging.
Return procedure for AD7812YR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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