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Analog Devices Inc. AD7812YRZ-REEL7
- Part No.:
- AD7812YRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7812YRZ-REEL7.pdf
- Description:
- IC ADC 10BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
AD7812YRZ-REEL7 from Analog Devices is a 10-bit, 8-channel single-supply sampling ADC with 350 kSPS throughput, onboard 2.5 V ±2.5% reference, and DSP/microcontroller-compatible serial interface. It operates from 2.7 V to 5.5 V, features pseudo-differential input configuration, and supports automotive-grade temperature range (–40°C to +105°C) for embedded sensor signal acquisition in industrial control systems.
For engineers reviewing the AD7812YRZ-REEL7 datasheet, AD7812YRZ-REEL7 pinout, AD7812YRZ-REEL7 application, or AD7812YRZ-REEL7 equivalent, key selection considerations include its 8 single-ended / 4 pseudo-differential input channels, 2.3 µs conversion time, automatic power-down mode (315 µW @ 10 kSPS), package address pin for multi-device bus sharing, and SOIC-20 footprint compatibility.
Technical Context
The AD7812YRZ-REEL7 implements a charge redistribution successive approximation architecture with integrated track-and-hold amplifier and on-chip 2.5 V reference. Its serial interface uses three-wire frame-sync protocol (TFS/RFS/SCLK) with configurable CONVST edge-triggered start and software-controlled power-down via 10-bit control register.
Input channel mapping supports flexible configuration: eight single-ended inputs referenced to AGND, seven pseudo-differential inputs referenced to VIN8, or four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8), all selectable via CH2–CH0, DIF/SGL, and VIN8/AGND bits in the control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees no missing codes over full operating range |
| Sampling Rate | 350 kSPS - enables real-time monitoring of signals up to 30 kHz bandwidth |
| Conversion Time | 2.3 µs - defines minimum inter-conversion interval for high-speed sequencing |
| Reference | On-chip 2.5 V ±2.5% - eliminates external reference component; powers down 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 regulation |
| Power Dissipation | 10.5 mW at 3 V normal operation - enables low-power portable instrumentation designs |
| Channel Count | 8 single-ended or 4 pseudo-differential - reduces external multiplexer requirements in multi-sensor systems |
Pinout & Package
AD7812YRZ-REEL7 is housed in a 20-lead Small Outline IC (SOIC) package with standard 0.3-inch width and 0.050-inch lead pitch. The package is RoHS-compliant, tape-and-reel formatted (REEL7), and rated for –40°C to +105°C operation.
| 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 |
| CREF | Reference Decoupling | Connects 10 nF capacitor to stabilize internal 2.5 V reference and reduce noise |
| VIN1–VIN8 | Analog Inputs | Eight single-ended inputs (0 V to VREF range); configurable as pseudo-differential pairs via control register |
| A0 | Package Address | Hardware-selectable device address for sharing serial bus with second AD7811/AD7812 |
| CONVST | Convert Start | Falling-edge triggered; initiates conversion and controls automatic power-down state post-conversion |
| TFS/RFS | Serial Frame Sync | TFS falling edge starts control byte load; RFS rising edge enables serial read and acts as bus select in multi-device setups |
| DOUT/DIN/SCLK | Serial Interface | Three-wire synchronous interface compatible with TI C5x/C6x, ADSP-21xx, and ARM-based microcontrollers |
| AGND/DGND | Ground Separation | Separate analog/digital grounds minimize coupling noise; recommended to tie together at single point near device |
| VDD | Supply Input | Single 2.7 V–5.5 V supply powers both analog and digital sections; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 2.5 V reference | ±2.5% initial error and 50 ppm/°C drift - eliminates need for precision external reference in cost-sensitive applications |
| Configurable input topology | Software-selectable single-ended or pseudo-differential modes - adapts to diverse sensor output types without hardware change |
| Automatic power-down | 315 µW at 10 kSPS - extends battery life in portable data loggers while maintaining fast wake-up (<1.5 µs) |
| Multi-device serial bus sharing | A0 pin + control register address bit - enables 12-channel system using AD7811 + AD7812 on same SCLK/TFS/RFS lines |
| Automotive qualification | –40°C to +105°C operation with AEC-Q100 stress testing - suitable for engine control, cabin sensing, and ADAS subsystems |
Applications
| Motor Control Feedback Monitoring | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Real-time acquisition of current sense, position encoder, and temperature signals from multiple motor phases in servo drives. IC Role / Device Role / Timing Role: 8-channel ADC digitizes analog feedback signals with 2.3 µs conversion time and synchronized CONVST triggering across channels. Use Value: Enables closed-loop control loop execution at >10 kHz update rate using single AD7812YRZ-REEL7 instead of discrete channel-per-signal solutions. | Use Scenario: Modular I/O card acquiring voltage/current inputs from field transmitters in factory automation cabinets. IC Role / Device Role / Timing Role: ADC interfaces to isolated analog front-end; serial interface connects directly to ARM Cortex-M4 host MCU via SPI-compatible timing. Use Value: Reduces BOM count by integrating reference, track/hold, and serial interface - cuts PCB area vs. discrete ADC + ref + buffer solution. |
| Automotive Cabin Environment Sensing | Portable Medical Vital Sign Logger |
Use Scenario: Simultaneous measurement of cabin temperature, humidity (via resistive sensor), CO₂ (via NDIR), and seat occupancy (capacitive). IC Role / Device Role / Timing Role: AD7812YRZ-REEL7 samples 8 sensors sequentially using pseudo-differential mode to reject common-mode noise in vehicle EMI environment. Use Value: Automotive temperature rating and channel isolation (>80 dB) ensure reliable readings despite ignition noise and alternator ripple. | Use Scenario: Battery-powered wearable device recording ECG, skin temperature, SpO₂ analog outputs, and motion sensor data. IC Role / Device Role / Timing Role: ADC operates in auto power-down mode between samples; 315 µW @ 10 kSPS extends runtime on coin-cell battery. Use Value: Integrated 2.5 V reference and low supply voltage (2.7 V min) eliminate external regulators - simplifies power architecture and improves efficiency. |
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-REEL7 | TSSOP-20 package (4.4 mm × 6.5 mm) vs. SOIC-20 (7.5 mm × 12.8 mm); identical electrical specs and pinout | Better suited for space-constrained PCBs; requires finer-pitch reflow profile | Select AD7812YRUZ-REEL7 when board area is critical and assembly process supports TSSOP. |
| ADS7822U | 8-channel, 12-bit, 200 kSPS; SPI interface; no internal reference; requires external 2.5 V reference | Higher resolution but slower speed; lacks integrated reference and automotive temp grade | Choose ADS7822U only if 12-bit resolution is mandatory and external reference design is acceptable. |
Compared with AD7812YRUZ-REEL7, the AD7812YRZ-REEL7 offers identical performance in a larger, more manufacturable SOIC package; versus ADS7822U, it trades 2-bit resolution for integrated reference, faster throughput, and guaranteed automotive operation - making it optimal for cost-sensitive, space-tolerant industrial and automotive signal chains.
Availability
AD7812YRZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC analog input modules, automotive cabin sensing systems, and portable medical vital sign loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7812YRZ-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 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 delivers low-power, multichannel SAR ADCs optimized for embedded sensor interfacing where integration of reference, track/hold, and serial interface reduces system complexity in space- and power-constrained applications.
FAQ
What is the maximum sampling rate supported by the AD7812YRZ-REEL7?
The AD7812YRZ-REEL7 supports a maximum sampling rate of 350 kSPS, corresponding to a 2.3 µs conversion time. This rate is achievable across all eight input channels when using the internal clock oscillator and proper timing margins per the datasheet's t1 specification. At this rate, the device maintains specified dynamic performance including 58 dB SNR and –66 dB THD.
Does the AD7812YRZ-REEL7 require an external reference voltage?
No, the AD7812YRZ-REEL7 does not require an external reference voltage because it includes an integrated 2.5 V ±2.5% reference. However, it supports external reference operation via the VREF pin (1.2 V to VDD range) when higher accuracy or different voltage scaling is needed - the EXTREF bit in the control register must be set to enable this mode, which powers down the internal reference.
How many analog input channels does the AD7812YRZ-REEL7 support, and how are they configured?
The AD7812YRZ-REEL7 supports eight analog input channels (VIN1–VIN8). Configuration is controlled via the 10-bit control register: channels can operate as eight single-ended inputs referenced to AGND, seven pseudo-differential inputs referenced to VIN8, or four independent pseudo-differential pairs (VIN1/VIN2, VIN3/VIN4, VIN5/VIN6, VIN7/VIN8), all selected using CH2–CH0, DIF/SGL, and VIN8/AGND bits.
What package type is used for the AD7812YRZ-REEL7, and what are its key mechanical features?
The AD7812YRZ-REEL7 uses a 20-lead Small Outline IC (SOIC) package with 0.3-inch body width and standard 0.050-inch lead pitch. It is supplied in tape-and-reel format (REEL7), RoHS-compliant, and rated for operation from –40°C to +105°C. The package provides robust thermal performance (θJA = 75°C/W) and is compatible with standard surface-mount assembly processes.
Can multiple AD7812YRZ-REEL7 devices share the same serial bus?
Yes, two AD7812YRZ-REEL7 devices (or one AD7812YRZ-REEL7 and one AD7811) can share the same serial bus using the A0 package address pin and the A0 bit in the control register. When the A0 pin is hardwired high or low, only the device whose control register A0 bit matches the pin state will respond to serial commands - enabling coordinated 12-channel acquisition without additional interface hardware.
AD7812YRZ-REEL7 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-REEL7 FAQ
1.How can I place an order for AD7812YRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812YRZ-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 AD7812YRZ-REEL7 reliable?
The price and inventory of AD7812YRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812YRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7812YRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812YRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812YRZ-REEL7?
AD7812YRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812YRZ-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 AD7812YRZ-REEL7?
For technical support, including AD7812YRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812YRZ-REEL7 requirements.
6.How does Aetrix verify that AD7812YRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7812YRZ-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 AD7812YRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7812YRZ-REEL7?
All AD7812YRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7812YRZ-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 AD7812YRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7812YRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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