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Analog Devices Inc. AD7812YNZ
- Part No.:
- AD7812YNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7812YNZ.pdf
- Description:
- IC ADC 10BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,186
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Product details
Overview
AD7812YNZ 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) in a 20-lead plastic DIP package.
For engineers reviewing the AD7812YNZ datasheet, AD7812YNZ pinout, AD7812YNZ application, or AD7812YNZ equivalent, this page delivers verified electrical specifications, validated pin functions, confirmed channel configuration modes, real-world timing constraints (e.g., 2.3 µs conversion time, 200 ns track/hold acquisition), and precise alternative part comparisons for industrial sensor interfacing, motor control feedback, and embedded data acquisition systems.
Technical Context
The AD7812YNZ implements a charge redistribution successive approximation architecture with integrated track-and-hold amplifier and on-chip 2.5 V reference. Its 10-bit resolution is guaranteed with no missing codes across –40°C to +105°C, and it supports both hardware-triggered (CONVST falling edge) and software-initiated conversions via a 10-bit write-only control register.
Input channels are configurable as eight single-ended (0 V to VREF) or four independent pseudo-differential pairs (e.g., VIN1/VIN2, VIN3/VIN4) using CH2–CH0, DIF/SGL, and VIN8/AGND bits. Serial communication uses three-wire frame-sync protocol (TFS/RFS/SCLK) with 11-cycle readout and high-impedance DOUT release after the 11th SCLK rising edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 350 kSPS - enables real-time capture of signals up to ~150 kHz (Nyquist-limited) without aliasing. |
| Conversion Time | 2.3 µs max - defines minimum inter-conversion interval; critical for high-throughput loop closure. |
| Reference | On-chip 2.5 V ±2.5% - eliminates external reference component; internal circuit 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 level-shifting. |
| Power (3 V) | 3.5 mA normal / 1 µA full power-down - enables <315 µW average consumption at 10 kSPS via auto power-down mode. |
| THD | –66 dB max at 30 kHz - ensures fidelity in audio-band and motor current sensing applications. |
Pinout & Package
AD7812YNZ is housed in a 20-lead 0.3" wide plastic dual-in-line package (mini-DIP, N-20). Pin 1 is VREF; pin 20 is VDD. All pins are through-hole compatible with standard 0.1" spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Accepts external reference (1.2 V to VDD) or connects to VDD; EXTREF bit must be set to enable external use. |
| CREF (Pin 2) | Reference capacitor node | Requires 10 nF capacitor to ground to stabilize internal reference and reduce noise. |
| VIN1–VIN8 (Pins 3,5–11) | Analog input channels | Support single-ended (0 V to VREF) or pseudo-differential configurations per control register settings. |
| AGND (Pin 4) | Analog ground reference | Must be tied to DGND at device pin; separates analog return path from digital switching noise. |
| A0 (Pin 12) | Package address input | Hardwired high/low to enable two AD7812YNZ or AD7811 devices on shared serial bus (no PCB changes required). |
| DGND (Pin 13) | Digital ground reference | Return path for serial interface and control logic; connected to AGND only at package pin. |
| TFS (Pin 14) | Transmit frame sync | Falling edge initiates 10-bit control byte load; synchronizes write operations to serial clock. |
| RFS (Pin 15) | Receive frame sync | Rising edge enables serial read counter; used for DSP compatibility and bus arbitration in multi-device systems. |
| DOUT (Pin 16) | Serial data output | Outputs 10-bit result MSB-first on SCLK rising edges; enters high-Z after 11th SCLK pulse. |
| DIN (Pin 17) | Serial data input | Accepts 10-bit control byte LSB-first on SCLK falling edges; 13 clocks required for full write cycle. |
| SCLK (Pin 18) | Serial clock input | External clock (max frequency not specified, but timing supports >1 MHz operation); controls data latching and shifting. |
| CONVST (Pin 19) | Convert start trigger | Falling edge initiates conversion and places track/hold into hold mode; determines post-conversion power state. |
| VDD (Pin 20) | Positive supply | 2.7 V to 5.5 V single supply powering analog core, reference, and digital interface. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel single-ended or 4-channel pseudo-differential input | Reduces external signal conditioning components by enabling flexible sensor interface topologies (e.g., thermocouple cold-junction compensation, motor phase current sensing). |
| On-chip 2.5 V ±2.5% reference with automatic shutdown | Eliminates need for external precision reference IC; internal reference disables when EXTREF = 1, reducing IDD by ~1 mA. |
| Hardware/software convert start and power-down control | Enables deterministic timing via CONVST pin or register-based triggering; supports burst-mode acquisition and low-duty-cycle sleep. |
| Multi-device serial bus sharing via A0 pin and control register address bit | Allows up to two AD7812YNZ or mixed AD7811/AD7812 systems on one 3-wire bus-reducing MCU GPIO count and PCB routing complexity. |
| Automated full/partial power-down between conversions | Reduces average power to 315 µW at 10 kSPS (VDD = 3 V), extending battery life in portable instrumentation without sacrificing wake-up latency. |
Applications
| Industrial Sensor Interface | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring multiple RTD, thermistor, or strain gauge outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 analog sensor signals with 2.3 µs conversion time and channel-to-channel isolation >80 dB. Use Value: Enables synchronized multi-sensor acquisition without external multiplexer delay or skew, improving thermal drift compensation accuracy. |
Use Scenario: Capturing three-phase motor current and DC bus voltage in variable-frequency drives. IC Role / Device Role / Timing Role: Pseudo-differential input mode rejects common-mode noise on motor current shunts; 350 kSPS supports 10 kHz PWM carrier sampling. Use Value: Delivers 10-bit resolution at high speed while maintaining >58 dB SNR-critical for field-oriented control torque estimation. |
| Automotive Body Electronics | Portable Data Loggers |
|
Use Scenario: Reading cabin temperature, humidity, and seat occupancy sensors in automotive HVAC and safety systems. IC Role / Device Role / Timing Role: Automotive-qualified (–40°C to +105°C) ADC with internal reference and low 10 mW power dissipation at 3 V. Use Value: Meets AEC-Q100 requirements without external reference or calibration, simplifying qualification testing and BOM management. |
Use Scenario: Battery-powered environmental monitoring units logging temperature, pressure, and light intensity over days. IC Role / Device Role / Timing Role: Full power-down mode draws only 1 µA; auto power-down reduces average current to sub-100 µA at 1 kSPS sampling. Use Value: Extends CR2032 battery life beyond 6 months while retaining fast wake-up (<1.5 µs power-up time) for event-triggered sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7812YR | Same die, SOIC-20 package (R-20A); θJA = 75°C/W vs. 105°C/W for DIP; no lead-forming required. | Better thermal performance in compact PCB layouts; unsuitable for through-hole prototyping or legacy DIP sockets. | Select AD7812YR for volume production where reflow assembly and thermal efficiency are prioritized over manual soldering flexibility. |
| AD7910BRMZ | 10-bit, 1 MSPS SAR ADC; no on-chip reference; requires external 2.5 V reference; SPI-compatible 4-wire interface. | Higher speed but increased BOM cost and layout sensitivity; lacks pseudo-differential channel pairing logic. | Choose AD7910BRMZ only when >350 kSPS is mandatory and system already includes precision reference; AD7812YNZ remains optimal for integrated-reference simplicity. |
Compared with AD7812YR, AD7812YNZ offers easier hand-soldering and higher thermal resistance for low-power ambient environments; compared with AD7910BRMZ, AD7812YNZ provides built-in reference and channel configuration logic-reducing firmware overhead and external component count in cost-sensitive embedded systems.
Availability
AD7812YNZ is available at Aetrix Electronics and suitable for industrial sensor interface, motor control feedback, and automotive body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD7812YNZ 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 for embedded data acquisition systems requiring low-power, multi-channel, single-supply ADCs with integrated reference and simple serial interface-targeting cost-sensitive, space-constrained applications where design-in longevity matters.
FAQ
What is the maximum sampling rate supported by the AD7812YNZ?
The AD7812YNZ supports a maximum throughput rate of 350 kSPS, corresponding to a guaranteed maximum 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). At lower throughput rates (e.g., 10 kSPS), the device automatically enters power-down mode between conversions, reducing average power to 315 µW at 3 V supply.
Does the AD7812YNZ require an external reference voltage?
No, the AD7812YNZ includes an on-chip 2.5 V ±2.5% reference that is enabled by default. An external reference (1.2 V to VDD) may be used by connecting it to the VREF pin and setting the EXTREF bit in the control register to logic 1. When EXTREF = 1, the internal reference circuitry powers down, reducing supply current by approximately 1 mA.
How many analog input channels does the AD7812YNZ support, and how are they configured?
The AD7812YNZ supports eight analog input channels (VIN1–VIN8). These can be configured 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) using the DIF/SGL, VIN8/AGND, and CH2–CH0 bits in the 10-bit control register.
What serial interface protocol does the AD7812YNZ use, and is it compatible with standard microcontrollers?
The AD7812YNZ uses a proprietary 3-wire frame-sync serial interface (TFS, RFS, SCLK) compatible with most DSPs and microcontrollers. It requires no dedicated SPI peripheral-bit-banging is feasible. TFS falling edge initiates control byte load; RFS rising edge enables read counter; data is shifted MSB-first on SCLK rising edges. The interface supports multi-device bus sharing via the A0 pin and control register address bit.
What is the power consumption of the AD7812YNZ at 3 V supply in normal operation and power-down modes?
At VDD = 3 V, the AD7812YNZ draws 3.5 mA (10.5 mW) in normal operation. In full power-down mode, supply current drops to 1 µA (3 µW); in partial power-down (internal reference active), it consumes 350 µA (1.05 mW). Auto power-down between conversions achieves 315 µW average power at 10 kSPS, making it suitable for battery-powered applications.
AD7812YNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7812YNZ FAQ
1.How can I place an order for AD7812YNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7812YNZ 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 AD7812YNZ reliable?
The price and inventory of AD7812YNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7812YNZ is usually 5 days.
3.What payment methods are accepted for AD7812YNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7812YNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7812YNZ?
AD7812YNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7812YNZ 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 AD7812YNZ?
For technical support, including AD7812YNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7812YNZ requirements.
6.How does Aetrix verify that AD7812YNZ is sourced from the original manufacturer or authorized distributors?
All AD7812YNZ 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 AD7812YNZ meets industry standards.
7.What is the process for return or replacement of AD7812YNZ?
All AD7812YNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7812YNZ, 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 AD7812YNZ part is unused and in its original packaging.
Return procedure for AD7812YNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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