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Analog Devices Inc. AD7812WYRUZ-RL
- Part No.:
- AD7812WYRUZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7812WYRUZ-RL.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,438
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Product details
Overview
AD7812WYRUZ-RL 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 systems.
For engineers reviewing the AD7812WYRUZ-RL datasheet, AD7812WYRUZ-RL pinout, AD7812WYRUZ-RL application, or AD7812WYRUZ-RL equivalent, key selection considerations include its 8-channel analog input flexibility, ±1 LSB relative accuracy over –40°C to +105°C, automatic power-down mode (315 µW @ 10 kSPS), and TSSOP-20 package compatibility with space-constrained automotive ECUs.
Technical Context
The AD7812WYRUZ-RL implements a charge redistribution DAC-based successive approximation converter with 2.3 µs conversion time and 200 ns track/hold acquisition time. Its control register enables software-configurable channel selection (CH2–CH0), input mode (single-ended vs. pseudo-differential), external reference enable (EXTREF), and power-down state (PD1/PD0).
It uses a 3-wire serial interface with independent RFS/TFS framing signals, supports multipackage bus sharing via A0 address pin, and provides high channel-to-channel isolation (–80 dB typ at 20 kHz) - critical for multi-sensor signal integrity in engine control units and battery management systems.
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 fast transients in motor current sensing |
| INL / DNL | ±1 LSB max - ensures monotonicity and predictable linearity for closed-loop feedback control |
| Reference | On-chip 2.5 V ±2.5% - eliminates need for external precision reference in cost-sensitive automotive modules |
| Power Dissipation | 10.5 mW max at 3 V - supports low-power operation in always-on vehicle subsystems |
| Channel Count | 8 single-ended or 4 pseudo-differential inputs - accommodates multi-sensor arrays without external MUX |
| SNR | 58 dB min at 30 kHz - sufficient for 9.5 ENOB in engine knock detection and throttle position monitoring |
Pinout & Package
AD7812WYRUZ-RL is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 6.5 mm, 0.65 mm pitch, RoHS-compliant and qualified for automotive applications (AEC-Q100 Grade 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Accepts 1.2 V to VDD external reference; internal 2.5 V ref disabled when EXTREF = 1 |
| CREF | Reference Decoupling | Connects 10 nF capacitor to stabilize on-chip reference and reduce noise |
| VIN1–VIN8 | Analog Inputs | Support single-ended (vs. AGND) or pseudo-differential (e.g., VIN1–VIN2) modes per control register |
| A0 | Package Address | Hardwired high/low to enable two AD7812WYRUZ-RL devices on shared serial bus |
| TFS / RFS | Serial Frame Sync | TFS falling edge initiates 10-bit control byte load; RFS rising edge enables serial read timing for DSP compatibility |
| CONVST | Convert Start | Falling-edge triggered; initiates track-to-hold transition and conversion sequence |
| DOUT / DIN | Serial Data I/O | DOUT outputs 10-bit result on SCLK rising edge; DIN accepts control byte on SCLK falling edge |
| AGND / DGND | Analog/Digital Ground | Separate ground pins require star-point connection at device for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Automated Power-Down | Reduces IDD to 350 µA (partial) or 1 µA (full) between conversions - extends battery life in telematics modules |
| Configurable Input Topology | Software-selectable single-ended or pseudo-differential mode per channel group - simplifies PCB layout for mixed-signal sensor interfaces |
| On-Chip Track-and-Hold | 200 ns acquisition time - eliminates need for external sample-hold circuit in high-speed motor phase current measurement |
| Multi-Device Serial Bus Sharing | A0 pin + control register address bit enables up to two AD7812WYRUZ-RL on one SPI-like bus - reduces MCU GPIO count in multi-ECU architectures |
| Automotive Qualification | Specified from –40°C to +105°C with AEC-Q100 stress testing - suitable for under-hood engine control and transmission control units |
Applications
| Engine Control Unit (ECU) | Battery Management System (BMS) |
|---|---|
Use Scenario: Simultaneous sampling of throttle position, manifold pressure, coolant temperature, and oxygen sensor voltages in gasoline direct injection engines. IC Role / Device Role / Timing Role: 8-channel ADC digitizes analog sensor outputs with synchronized CONVST triggering and 350 kSPS throughput to support real-time fuel-air ratio calculation. Use Value: Single AD7812WYRUZ-RL replaces discrete MUX + ADC solution, reducing BOM count and improving channel matching (±0.75 LSB gain error match). | Use Scenario: Monitoring cell voltage, pack current, and thermal sensors across 12-cell Li-ion battery stacks in EV powertrain systems. IC Role / Device Role / Timing Role: Pseudo-differential input mode rejects common-mode noise from high-current switching paths; internal 2.5 V reference ensures stable scaling across wide temperature range. Use Value: ±1 LSB relative accuracy and –80 dB channel isolation prevent cross-talk-induced SOC estimation errors during regenerative braking events. |
| Advanced Driver Assistance Systems (ADAS) | Electric Power Steering (EPS) |
Use Scenario: Digitizing radar front-end IF signals and camera module analog video outputs in fusion processing units. IC Role / Device Role / Timing Role: High SNR (58 dB) and low THD (–66 dB) preserve signal fidelity for FFT-based object detection algorithms running on automotive SoCs. Use Value: 2.3 µs conversion time enables sub-microsecond latency for time-critical collision avoidance decisions. | Use Scenario: Sampling torque sensor, motor phase currents, and steering angle feedback in brushless DC motor control loops. IC Role / Device Role / Timing Role: Onboard track-and-hold captures transient current spikes during rapid steering maneuvers; software-controlled channel sequencing aligns with PWM commutation timing. Use Value: Automatic power-down between samples cuts average power to <1 mW - critical for continuous operation in EPS ECU thermal envelope. |
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 |
|---|---|---|---|
| AD7812YRUZ | Same silicon, identical specs, but packaged in RU-20 (TSSOP-20) without tape-and-reel suffix - differs only in packaging format and reel quantity | No functional difference; used in same automotive designs where reel delivery is not required | Select AD7812WYRUZ-RL for automated SMT assembly; AD7812YRUZ for manual prototyping or low-volume builds |
| MAX11131ATJ+T | 10-bit, 8-channel SAR ADC with 500 kSPS, internal 4.096 V reference, SPI interface, but no pseudo-differential mode or A0 address pin | Lacks multi-device bus sharing capability and flexible input configuration - requires external level-shifting for 0–VDD input range | Choose MAX11131ATJ+T only if higher speed and integrated 4.096 V reference outweigh loss of pseudo-differential flexibility and bus-sharing |
Compared with AD7812YRUZ, AD7812WYRUZ-RL offers identical electrical performance with optimized tape-and-reel packaging for high-volume SMT lines; versus MAX11131ATJ+T, it trades raw speed for superior noise immunity, input topology flexibility, and automotive-ready qualification - making it preferred for safety-critical engine and chassis control.
Availability
AD7812WYRUZ-RL is available at Aetrix Electronics and suitable for automotive engine control, battery management, and ADAS sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7812WYRUZ-RL 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 automotive-grade, low-power, multichannel data acquisition in harsh environments - emphasizing robust serial interfacing, internal reference stability, and guaranteed operation from –40°C to +105°C.
FAQ
What is the operating temperature range specified for the AD7812WYRUZ-RL?
The AD7812WYRUZ-RL is fully specified from –40°C to +105°C and qualified per AEC-Q100 Grade 3 requirements. All key parameters - including ±1 LSB relative accuracy, 58 dB SNR, and 350 kSPS throughput - are guaranteed across this full automotive temperature range, enabling use in under-hood engine control and transmission control units without derating.
Does the AD7812WYRUZ-RL support pseudo-differential input mode, and how is it configured?
Yes, the AD7812WYRUZ-RL supports pseudo-differential input mode via its 10-bit control register. Setting DIF/SGL = 1 configures VIN1–VIN8 as four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, etc.). This mode is selected by writing the appropriate bits to the control register over the serial interface - no hardware changes are needed, and configuration persists until rewritten.
Can the AD7812WYRUZ-RL use an external reference, and what is the valid input voltage range?
Yes, the AD7812WYRUZ-RL accepts an external reference applied to the VREF pin. The valid input range is 1.2 V to VDD, and the EXTREF bit in the control register must be set to logic 1 to disable the internal 2.5 V reference and enable external reference operation. When enabled, the on-chip reference circuitry powers down, reducing current consumption by ~1 mA.
How does the AD7812WYRUZ-RL achieve low power consumption in battery-powered automotive applications?
The AD7812WYRUZ-RL achieves low power via three mechanisms: (1) automatic full power-down mode (1 µA typical) between conversions, (2) partial power-down mode (350 µA) retaining internal reference, and (3) programmable throughput scaling - e.g., 315 µW average at 10 kSPS with 3 V supply. These features are controlled entirely through the PD1/PD0 bits in the control register.
Is the AD7812WYRUZ-RL pin-compatible with other members of the AD7811/AD7812 family?
No, the AD7812WYRUZ-RL is not pin-compatible with AD7811 variants due to its 20-pin TSSOP package versus the AD7811's 16-pin footprint. However, it shares identical pin functions and signal definitions with AD7812YRUZ and AD7812YR - differing only in packaging format and reel specification. Layout reuse is possible across all AD7812 variants using RU-20 or R-20A packages.
AD7812WYRUZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADI0012
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- -
AD7812WYRUZ-RL FAQ
1.How can I place an order for AD7812WYRUZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812WYRUZ-RL 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 AD7812WYRUZ-RL reliable?
The price and inventory of AD7812WYRUZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812WYRUZ-RL is usually 5 days.
3.What payment methods are accepted for AD7812WYRUZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812WYRUZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812WYRUZ-RL?
AD7812WYRUZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812WYRUZ-RL 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 AD7812WYRUZ-RL?
For technical support, including AD7812WYRUZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812WYRUZ-RL requirements.
6.How does Aetrix verify that AD7812WYRUZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7812WYRUZ-RL 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 AD7812WYRUZ-RL meets industry standards.
7.What is the process for return or replacement of AD7812WYRUZ-RL?
All AD7812WYRUZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7812WYRUZ-RL, 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 AD7812WYRUZ-RL part is unused and in its original packaging.
Return procedure for AD7812WYRUZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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