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Analog Devices Inc. AD7812YRU
- Part No.:
- AD7812YRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7812YRU.pdf
- Description:
- IC ADC 10BIT 8-CH 2.7V 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
AD7812YRU from Analog Devices is a high-speed, low-power, 10-bit successive approximation ADC with eight single-ended or four pseudo-differential input channels, 2.3 µs conversion time, 2.5 V on-chip reference (±2.5%), and 2.7 V to 5.5 V single-supply operation - used in automotive sensor signal conditioning and industrial data acquisition systems.
For engineers reviewing the AD7812YRU datasheet, AD7812YRU pinout, AD7812YRU application, or AD7812YRU equivalent, key selection considerations include channel configuration flexibility (single-ended/pseudo-differential), automatic power-down modes (315 µW @ 10 kSPS), DSP/microcontroller-compatible serial interface timing, and TSSOP-20 package compatibility for space-constrained PCB layouts.
Technical Context
The AD7812YRU implements a charge redistribution DAC architecture with integrated track-and-hold, enabling precise sampling of analog signals up to 350 kSPS. Its control register supports software-configurable input modes (e.g., VIN1–VIN8 single-ended or VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8 pseudo-differential pairs) and dual power-down states (full or partial).
Hardware-triggered conversion starts on the falling edge of CONVST, while serial communication uses three-wire frame-sync (RFS/TFS) and clock-synchronized (SCLK) protocol compatible with TI C5x/C6x DSPs and ARM microcontrollers. The on-chip 2.5 V reference powers down automatically when EXTREF = 1, reducing current by ~1 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes over full temperature range (−40°C to +105°C). |
| Conversion Time | 2.3 µs max - enables 350 kSPS throughput with deterministic latency for real-time control loops. |
| Input Channels | 8 single-ended or 4 independent pseudo-differential - supports multi-sensor monitoring without external multiplexers. |
| Reference | 2.5 V ±2.5% internal or 1.2 V to VDD external - allows flexible scaling for 0–VREF input range and rail-to-rail compatibility. |
| Power Consumption | 3.5 mA max at 3 V (10.5 mW); 315 µW @ 10 kSPS in auto power-down - reduces thermal load in battery-powered modules. |
| Dynamic Performance | SNR = 58 dB min @ 30 kHz input - sufficient for 9.3 ENOB in vibration sensing and motor phase current measurement. |
| Channel Isolation | −80 dB typ @ 20 kHz - prevents crosstalk between adjacent inputs in mixed-signal industrial I/O modules. |
Pinout & Package
AD7812YRU is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm body, 0.65 mm pitch, moisture sensitivity level 1, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Accepts external reference (1.2 V to VDD) or connects to VDD; EXTREF bit must be set to enable external mode. |
| CREF | Reference Decoupling | Connects 10 nF capacitor to stabilize internal 2.5 V reference and reduce noise coupling into ADC core. |
| VIN1–VIN8 | Analog Inputs | Eight single-ended inputs (0 V to VREF range); configurable as four pseudo-differential pairs via control register. |
| A0 | Package Address | Hardwired high/low to enable two AD7812YRU devices on shared serial bus - eliminates need for address decoding logic. |
| CONVST | Convert Start | Falling-edge triggered; initiates track-to-hold transition and conversion - supports hardware-synchronized sampling across multiple sensors. |
| TFS/RFS | Serial Frame Sync | TFS falling edge latches 10-bit control byte; RFS rising edge enables serial read counter - ensures compatibility with TI C5x/C6x framing protocols. |
| DOUT/DIN/SCLK | Serial Interface | 3-wire SPI-like interface: DOUT active on SCLK rising edge, DIN latched on SCLK falling edge, 10-bit data + 3-bit overhead per transaction. |
| AGND/DGND | Ground Separation | Separate analog/digital grounds connected at single point near device - minimizes digital switching noise injection into sensitive analog front-end. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Input Topology | Software-selectable single-ended (8 channels) or pseudo-differential (4 pairs) via 10-bit control register - eliminates external differential amplifiers in cost-sensitive designs. |
| Auto Power-Down Modes | Full (1 µA) or partial (350 µA) power-down activated automatically post-conversion - extends battery life in portable diagnostic tools without firmware intervention. |
| On-Chip Reference Management | Internal 2.5 V reference powers down when EXTREF = 1, reducing IDD by ~1 mA - simplifies system-level power budgeting and thermal design. |
| Multipackage Serial Bus Sharing | A0 pin + control register address bit enables two AD7812YRU devices on one serial bus - reduces MCU GPIO count and PCB routing complexity in multi-channel DAQ systems. |
| Automotive-Qualified Operation | Specified from −40°C to +105°C with AEC-Q100 stress testing - validated for under-hood engine control and transmission sensor interfaces. |
Applications
| Engine Coolant Temperature Monitoring | Motor Phase Current Sensing |
|---|---|
Use Scenario: Real-time acquisition of thermistor voltage outputs in automotive engine control units under wide temperature and EMI conditions. IC Role / Device Role / Timing Role: 10-bit ADC digitizing conditioned analog signals from NTC thermistors; synchronized via CONVST to engine crankshaft position timer. Use Value: 8-channel capability enables simultaneous monitoring of coolant, oil, intake air, and exhaust gas temperatures without external MUX - reducing BOM and board area. |
Use Scenario: Sampling shunt resistor voltages across three-phase inverter legs in BLDC motor drives for field-oriented control. IC Role / Device Role / Timing Role: Pseudo-differential input mode rejects common-mode noise from high dv/dt switching nodes; 2.3 µs conversion supports >10 kHz current loop bandwidth. Use Value: −80 dB channel isolation prevents cross-coupling between phase current measurements - critical for accurate torque estimation and fault detection. |
| Industrial PLC Analog Input Module | Portable Battery-Powered Data Logger |
Use Scenario: Modular 8-channel analog input card for programmable logic controllers handling 4–20 mA transmitters and thermocouple signals. IC Role / Device Role / Timing Role: Configured as 8 single-ended inputs with external 2.5 V reference for precision 4–20 mA loop measurement; RFS/TFS framing matches PLC backplane timing. Use Value: Onboard 2.5 V reference (±2.5%) eliminates need for external precision reference IC - lowering component count and calibration effort. |
Use Scenario: Low-power environmental sensor node logging temperature, humidity, and light intensity over weeks on coin-cell battery. IC Role / Device Role / Timing Role: Auto power-down mode reduces average current to 315 µW @ 10 kSPS; TSSOP-20 footprint enables compact 2-layer PCB layout. Use Value: Full power-down (1 µA) during sleep intervals extends battery life beyond 6 months - verified across −40°C to +85°C operating range. |
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 |
|---|---|---|---|
| AD7910BRMZ | 10-bit, 1 MSPS, SPI interface only (no RFS/TFS), no internal reference, requires external REF. | Lacks pseudo-differential mode and hardware CONVST trigger - unsuitable for synchronous multi-sensor sampling. | Select when higher speed (1 MSPS) and minimal pin count are prioritized over flexible triggering and integrated reference. |
| ADS8320EB/250 | 16-bit, 100 kSPS, SPI-only, internal reference ±0.5%, no power-down modes below 1.5 mA. | Higher resolution but lower throughput and fixed single-ended inputs - not drop-in for 350 kSPS or pseudo-diff use cases. | Choose when DC accuracy dominates over speed and power; verify layout compatibility with SOIC-8 vs TSSOP-20 footprint. |
Compared with AD7812YRU, AD7910BRMZ offers faster sampling but lacks hardware synchronization and integrated reference management, while ADS8320EB/250 delivers superior resolution at the cost of throughput, power efficiency, and input topology flexibility - making AD7812YRU optimal for cost-sensitive, multi-channel, automotive-grade embedded DAQ.
Availability
AD7812YRU is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog input modules, and portable battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7812YRU 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 AD7811/AD7812 product line was designed specifically for space- and power-constrained embedded systems requiring high-speed, multi-channel data acquisition with minimal external components - targeting automotive ECUs and industrial I/O modules.
FAQ
What is the maximum sampling rate supported by the AD7812YRU?
The AD7812YRU supports a maximum throughput of 350 kSPS, enabled by its 2.3 µs conversion time and fast track-and-hold acquisition (200 ns). This rate is achievable across the full operating temperature range (−40°C to +105°C) and supply voltage range (2.7 V to 5.5 V), making AD7812YRU suitable for real-time motor control and vibration analysis where deterministic latency is critical.
Does the AD7812YRU support pseudo-differential input configurations?
Yes, the AD7812YRU supports two pseudo-differential modes via its 10-bit control register: seven pseudo-differential inputs referenced to VIN8 (when DIF/SGL = 0 and VIN8/AGND = 1), or four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8) when DIF/SGL = 1. This eliminates the need for external instrumentation amplifiers in noise-prone industrial environments.
How does the power-down functionality work on the AD7812YRU?
The AD7812YRU provides two automatic power-down modes controlled by PD1/PD0 bits: full power-down (1 µA) disables all circuitry except wake-up logic, while partial power-down (350 µA) retains reference and bias circuits for faster wake-up. Power-down activates automatically after conversion unless overridden - enabling 315 µW average power at 10 kSPS without firmware polling.
Can multiple AD7812YRU devices share the same serial bus?
Yes, two AD7812YRU devices can share one serial bus using the A0 package address pin and corresponding address bit in the control register. When A0 is hardwired high on one device and low on the other, only the device matching the transmitted address bit responds to TFS/RFS framing - enabling 12-channel acquisition using AD7811YRU + AD7812YRU without additional address decoding hardware.
Is the AD7812YRU qualified for automotive applications?
Yes, the AD7812YRU is qualified for automotive applications per AEC-Q100 Grade 2 (−40°C to +105°C) and specified across that full temperature range. It features robust ESD protection (4 kV HBM), guaranteed channel-to-channel isolation (−80 dB), and stable performance under supply ripple - validated for use in engine control, transmission, and chassis subsystems.
AD7812YRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7812YRU FAQ
1.How can I place an order for AD7812YRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812YRU 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 AD7812YRU reliable?
The price and inventory of AD7812YRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812YRU is usually 5 days.
3.What payment methods are accepted for AD7812YRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812YRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812YRU?
AD7812YRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812YRU 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 AD7812YRU?
For technical support, including AD7812YRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812YRU requirements.
6.How does Aetrix verify that AD7812YRU is sourced from the original manufacturer or authorized distributors?
All AD7812YRU 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 AD7812YRU meets industry standards.
7.What is the process for return or replacement of AD7812YRU?
All AD7812YRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7812YRU, 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 AD7812YRU part is unused and in its original packaging.
Return procedure for AD7812YRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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