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Analog Devices Inc. AD7812YRZ-REEL
- Part No.:
- AD7812YRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7812YRZ-REEL.pdf
- Description:
- IC ADC 10BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,519
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Product details
Overview
AD7812YRZ-REEL from Analog Devices is a 10-bit, 8-channel single-supply sampling ADC with 350 kSPS throughput, on-chip 2.5 V ±2.5% reference, and DSP/microcontroller-compatible serial interface. It operates from 2.7 V to 5.5 V, supports pseudo-differential or single-ended input configurations, and is qualified for automotive applications - used in engine control unit (ECU) sensor signal digitization where channel density and low-power operation are critical.
For engineers reviewing the AD7812YRZ-REEL datasheet, AD7812YRZ-REEL pinout, AD7812YRZ-REEL application, or AD7812YRZ-REEL equivalent, key selection considerations include its 8-channel analog input flexibility, 2.3 µs conversion time, ±1 LSB relative accuracy, automatic power-down mode (315 µW @ 10 kSPS), and SOIC-20 package compatibility with industrial and automotive PCB layouts.
Technical Context
The AD7812YRZ-REEL implements a charge redistribution successive approximation register (SAR) architecture with integrated track-and-hold amplifier and internal 2.5 V reference. Its serial interface uses three-wire frame-sync (RFS/TFS), SCLK, and bidirectional data (DIN/DOUT) with configurable address pin (A0) for multi-device bus sharing.
Input configuration is fully software-controlled via a 10-bit write-only control register supporting eight single-ended channels or four independent pseudo-differential pairs (e.g., VIN1/VIN2, VIN3/VIN4). Power management includes full and partial power-down modes triggered by PD1/PD0 bits, with 1.5 µs wake-up time after CONVST assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes across full temperature range (–40°C to +105°C) |
| Sampling Rate | 350 kSPS - enables real-time capture of signals up to 30 kHz with ≥58 dB SNR |
| Conversion Time | 2.3 µs - defines minimum inter-conversion interval for high-throughput acquisition |
| Reference | On-chip 2.5 V ±2.5% - eliminates external reference component; disables automatically when EXTREF = 1 |
| Supply Range | 2.7 V to 5.5 V - supports direct connection to 3.3 V or 5 V logic rails without level-shifting |
| Power Dissipation | 10.5 mW at 3 V normal operation; drops to 315 µW at 10 kSPS with auto power-down |
| DC Accuracy | ±1 LSB relative accuracy and ±2 LSB gain/offset error - ensures <0.1% full-scale linearity in closed-loop control feedback |
Pinout & Package
AD7812YRZ-REEL is housed in a 20-lead Small Outline IC (SOIC) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL suffix).
| 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 use |
| CREF | Reference Decoupling | Requires 10 nF capacitor to ground for optimal noise performance of internal 2.5 V reference |
| 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 | Hardware-selectable device ID enabling two AD7812YRZ-REEL units to share one serial bus |
| TFS/RFS | Frame Sync Control | TFS initiates control byte write; RFS enables serial read and serves as bus select in multipackage systems |
| DOUT/DIN | Serial Data I/O | Bidirectional 10-bit data port synchronized to SCLK; DOUT enters high-impedance after 11th clock edge |
| CONVST | Convert Start | Falling-edge-triggered; initiates conversion and determines post-conversion power state (PD1/PD0 dependent) |
| AGND/DGND | Analog/Digital Ground | Separate ground pins - must be tied together at single point near device for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel programmable input mux | Supports mixed-signal acquisition from multiple sensors (e.g., throttle position, coolant temp, O2, knock) in single ECU board space |
| Software-configurable pseudo-differential mode | Enables rejection of common-mode noise in motor current sensing or thermocouple interfaces without external instrumentation amps |
| Auto power-down between conversions | Reduces average power to 315 µW at 10 kSPS - extends battery life in portable diagnostic tools |
| DSP/microcontroller serial interface | 3-wire synchronous protocol compatible with SPI, QSPI, and TI McBSP - eliminates need for glue logic or FPGA bridging |
| Automotive qualification | Rated for –40°C to +105°C operation and AEC-Q100 stress testing - suitable for under-hood deployment |
Applications
| Engine Control Unit (ECU) | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Digitizing multiple analog sensor outputs (MAP, TPS, IAT, ECT) within tight timing windows during combustion cycle. IC Role / Device Role / Timing Role: Primary 10-bit SAR ADC providing synchronized 8-channel sampling at ≤350 kSPS for real-time closed-loop fuel injection control. Use Value: On-chip reference and fast 2.3 µs conversion eliminate external components and reduce loop latency vs. legacy 8-bit solutions. |
Use Scenario: Acquiring 4–8 process variables (pressure, flow, temperature) in factory automation with isolated field-side inputs. IC Role / Device Role / Timing Role: High-density analog front-end ADC interfacing to isolated signal conditioners and microcontroller via shared serial bus. Use Value: A0 address pin and TFS/RFS framing allow stacking multiple AD7812YRZ-REEL devices on one SPI bus - cuts BOM cost and PCB area vs. discrete channel-per-ADC designs. |
| Automotive Battery Management System (BMS) | Portable Diagnostic Tool |
Use Scenario: Monitoring cell voltages and pack temperature sensors in 12–48 V EV battery packs with thermal constraints. IC Role / Device Role / Timing Role: Low-power 10-bit ADC performing periodic voltage scans while maintaining <1 µA standby current in full power-down mode. Use Value: 2.7 V minimum supply and 315 µW @ 10 kSPS enable direct connection to battery rail without LDO - simplifies power architecture. |
Use Scenario: Handheld OBD-II scanner capturing live sensor PIDs (e.g., MAF, O2, RPM) for technician diagnostics. IC Role / Device Role / Timing Role: Compact, self-contained ADC subsystem delivering calibrated 10-bit readings to ARM Cortex-M host over minimal-pin-count interface. Use Value: SOIC-20 package and 3-wire serial interface reduce PCB footprint and routing complexity - accelerates time-to-market for compact form factors. |
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 |
|---|---|---|---|
| AD7918BRUZ | 8-channel, 10-bit, 1 MSPS SAR ADC; no internal reference; requires external 2.5 V ref; SPI-compatible only | Higher speed but no auto power-down; lacks pseudo-differential mode and A0 bus-sharing capability | Choose when >350 kSPS throughput is mandatory and system already provides precision reference |
| MAX11131AUT+ | 8-channel, 10-bit, 500 kSPS SAR ADC; internal 2.048 V ref; SPI interface; no A0 pin or pseudo-differential support | Lower reference voltage limits input range; no hardware address pin - requires GPIO-based device selection | Prefer for cost-sensitive consumer-grade systems where ±2.5% ref tolerance is acceptable and bus arbitration is handled externally |
Compared with AD7812YRZ-REEL, AD7918BRUZ offers higher speed but increases BOM count and layout complexity due to external reference dependency, while MAX11131AUT+ sacrifices channel flexibility and bus scalability to achieve lower unit cost - making AD7812YRZ-REEL optimal for automotive and industrial designs requiring integrated reference, low-power operation, and multi-device serial bus efficiency.
Availability
AD7812YRZ-REEL is available at Aetrix Electronics and suitable for engine control units, industrial PLC analog input modules, and automotive battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7812YRZ-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 industrial, automotive, communications, and healthcare markets.
The AD7812YRZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for space-constrained, low-power, multichannel data acquisition in harsh environments - emphasizing integration, reliability, and ease of system-level implementation.
FAQ
What is the maximum sampling rate supported by the AD7812YRZ-REEL?
The AD7812YRZ-REEL supports a maximum sampling rate of 350 kSPS, corresponding to a guaranteed 2.3 µs conversion time across its full operating temperature range (–40°C to +105°C). This rate is achievable using the internal 2.5 V reference and 3 V or 5 V supply; actual throughput may decrease slightly under heavy capacitive loading or marginal timing margins.
Does the AD7812YRZ-REEL require an external reference, or can it operate with its internal reference?
The AD7812YRZ-REEL can operate with its internal 2.5 V ±2.5% reference without any external components. The internal reference is enabled by default (EXTREF = 0). To use an external reference (1.2 V to VDD), the EXTREF bit in the control register must be set to 1 - which also powers down the internal reference circuitry and reduces current draw by ~1 mA.
How many analog input channels does the AD7812YRZ-REEL support, and what configurations are available?
The AD7812YRZ-REEL supports eight analog input channels (VIN1–VIN8). These can be configured in three ways via its 10-bit control register: (1) eight single-ended inputs referenced to AGND; (2) seven pseudo-differential inputs referenced to VIN8; or (3) four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8).
Is the AD7812YRZ-REEL pin-compatible with other members of the AD7811/AD7812 family?
No - the AD7812YRZ-REEL is not pin-compatible with the AD7811 series. It uses a 20-lead SOIC package, whereas the AD7811 variants use 16-lead packages. However, both families share identical serial interface protocols, control register structure, and functional behavior, enabling firmware reuse across designs with appropriate pin mapping adjustments.
What power-saving features does the AD7812YRZ-REEL offer for battery-powered applications?
The AD7812YRZ-REEL offers two power-saving modes: partial power-down (350 µA quiescent current) and full power-down (1 µA). Both are controlled via PD1/PD0 bits in the control register and can be triggered automatically after each conversion. At 10 kSPS, average power drops to 315 µW - making it suitable for portable diagnostic tools and remote sensor nodes.
AD7812YRZ-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:
- Active
- 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:
- -
AD7812YRZ-REEL FAQ
1.How can I place an order for AD7812YRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812YRZ-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 AD7812YRZ-REEL reliable?
The price and inventory of AD7812YRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812YRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7812YRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812YRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812YRZ-REEL?
AD7812YRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812YRZ-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 AD7812YRZ-REEL?
For technical support, including AD7812YRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812YRZ-REEL requirements.
6.How does Aetrix verify that AD7812YRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7812YRZ-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 AD7812YRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7812YRZ-REEL?
All AD7812YRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7812YRZ-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 AD7812YRZ-REEL part is unused and in its original packaging.
Return procedure for AD7812YRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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