AD7812YNZ - 10-Bit 8-Ch 350kSPS SAR ADC | Analog Devices
MPN: AD7812YNZ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 25 | $14.75 | $368.75 |
| 100 | $12.1 | $1,210.00 |
| 250 | $10.85 | $2,712.50 |
AD7812YNZ Overview
An ADC (analog-to-digital converter) is a data-acquisition integrated circuit that converts real-world continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation-register (SAR) ADCs use a binary-search algorithm through an internal capacitive DAC to resolve one bit per clock cycle, achieving a balanced trade-off between speed, resolution, and power consumption. In the broader taxonomy, the AD7812YNZ is a SAR ADC, a sub-category of data converters (ADC/DAC), which sit inside the signal-chain IC family alongside amplifiers, filters, and references.
Key specifications include 10-bit resolution, 350 kSPS throughput, 2.3 µs typical conversion time, 8 single-ended analog input channels (software-selectable via an on-chip mux), and a serial output interface. The internal 2.5 V reference is trimmed for low drift and can be overdriven by an external reference for higher-accuracy applications. Power dissipation is approximately 10 mW at full throughput, dropping to under 10 µW in power-down mode - ideal for battery-powered or multiplexed multi-channel systems.
The AD7812YNZ implements a classic charge-redistribution SAR architecture with an input track-and-hold that supports signals well beyond the supply rails. Its serial interface is hardware-configurable for MSB-first or MSB-after-zero data framing, simplifying connection to industry-standard DSP serial ports as well as microcontroller SPI peripherals. Eight software-selectable input channels plus the wide analog input range make it well suited for industrial sensor arrays.
Typical applications include data acquisition systems, industrial process control, portable and battery-powered instrumentation, multi-channel sensor monitoring, and DSP front-end signal chains. Designers should consult the AD7812/AD7811 datasheet for layout recommendations regarding the REFIN/REFOUT bypass network and the analog/digital ground partitioning.
A practical design tip: decouple REFOUT with a 10 µF tantalum in parallel with a 0.1 µF ceramic to ensure reference stability and minimize conversion-noise coupling into the digital supply.
This page synthesizes distributor pricing, drop-in DIP-20 alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single reference for sourcing, replacement, and integration decisions on the AD7812YNZ.
Drop-in alternatives for AD7812YNZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7812YRZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7812YRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7811YNZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7812YNZ Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Input Channels | 8 (single-ended, software-selectable) |
| Sampling Rate | 350 kSPS |
| Conversion Time | 2.3 µs (typical) |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage Range | 2.7 V to 5.5 V (single supply) |
| On-Chip Reference Voltage | 2.5 V (external override supported) |
| Data Interface | Serial (DSP/microcontroller compatible) |
| Input Type | Single-ended, with on-chip track-and-hold |
| Power Dissipation | 10 mW (typical at full throughput) |
| Power-Down Current | <10 µA (typical) |
| Operating Temperature | -40 °C to +105 °C |
| Package | 20-PDIP (0.300 inch / 7.62 mm) |
| Mounting Type | Through-Hole (THT) |
| RoHS Status | Compliant (Pb-free) |
AD7812YNZ Pin Configuration
| Pin 1 | VIN1 — Analog input channel 1 |
| Pin 2 | VIN2 — Analog input channel 2 |
| Pin 3 | VIN3 — Analog input channel 3 |
| Pin 4 | VIN4 — Analog input channel 4 |
| Pin 5 | VIN5 — Analog input channel 5 |
| Pin 6 | VIN6 — Analog input channel 6 |
| Pin 7 | VIN7 — Analog input channel 7 |
| Pin 8 | VIN8 — Analog input channel 8 |
| Pin 9 | REFOUT — Internal 2.5 V reference output |
| Pin 10 | REFIN — Reference input (external override of internal ref) |
| Pin 11 | AGND — Analog ground |
| Pin 12 | AVDD — Analog supply voltage (2.7 V to 5.5 V) |
| Pin 13 | DVDD — Digital supply voltage |
| Pin 14 | DGND — Digital ground |
| Pin 15 | SCLK — Serial interface clock input |
| Pin 16 | DOUT — Serial data output |
| Pin 17 | CONVST — Conversion start input |
| Pin 18 | CS — Chip select input (active low) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
AD7812YNZ is suitable for 6 applications: Industrial Process Control and Data Acquisition, Portable Battery-Powered Instrumentation, Multi-Channel Sensor Monitoring Arrays, DSP Front-End Signal Chain, Medical Patient Monitoring Equipment, Automotive Sensor Cluster and Telematics.
Industrial Process Control and Data Acquisition
The AD7812YNZ's 8 single-ended input channels and 350 kSPS throughput make it a strong fit for industrial multi-channel data acquisition. With a 2.3 µs SAR conversion time and on-chip track-and-hold, the device can cycle through thermocouple, 4-20 mA, or bridge-sensor inputs in real time, while the serial interface connects directly to DSPs or microcontrollers running control loops. Per the Analog Devices datasheet, the 2.7-5.5 V single-supply operation simplifies board design in industrial 24V-bus systems when front-ended by a small LDO.
Recommended
Portable Battery-Powered Instrumentation
The AD7812YNZ is well suited for portable instrumentation thanks to its 2.7-5.5 V single-supply operation, sub-10 µA power-down current, and roughly 10 mW full-throughput dissipation. Designers can duty-cycle the ADC between active sampling and power-down for energy harvesting or battery-driven sensor loggers. According to the AD7811/AD7812 datasheet, the integrated 2.5 V reference eliminates the need for an external reference IC, reducing BOM and quiescent drain in handheld multimeters and field instruments.
Recommended
Multi-Channel Sensor Monitoring Arrays
With 8 software-selectable input channels, the AD7812YNZ can scan a small sensor array - temperature, pressure, strain - using a single ADC. The on-chip mux and track-and-hold settle in under 400 ns, so designers can interleave channel conversions at the full 350 kSPS aggregate rate. Per the Analog Devices datasheet, using external REFIN overdrive improves absolute accuracy when the array requires ratiometric measurements from a shared bridge excitation source.
Recommended
DSP Front-End Signal Chain
The AD7812YNZ's serial output is hardware-configured for DSP-compatible framing (MSB-first or MSB-after-zero), allowing direct connection to the serial ports of TI C6000, ADI SHARC, or general-purpose MCUs. The 350 kSPS throughput comfortably digitizes audio-bandwidth signals and control-loop feedback waveforms, while the 10-bit resolution suits voice-band codecs, motor-control feedback, and instrumentation front ends. Per the AD7811/AD7812 datasheet, the interface timing is fully documented for synchronous serial connection.
Recommended
Medical Patient Monitoring Equipment
The AD7812YNZ's combination of 8 channels and low power is useful in multi-parameter patient monitoring - capturing temperature, SpO2, respiration, and ECG auxiliaries around a single ADC. The 2.7-5.5 V supply is compatible with battery-backed medical device rails, and the SAR architecture provides no-pipeline latency, which simplifies event detection. Per the AD7811/AD7812 datasheet, designers should follow the recommended REFOUT/REFIN decoupling and separate analog/digital grounds to meet IEC 60601-1 noise margins.
Recommended
Automotive Sensor Cluster and Telematics
The AD7812YNZ can be deployed in non-safety automotive sensor clusters and telematics modules where 10-bit resolution is acceptable. Its -40 °C to +105 °C operating range and rugged PDIP package suit under-dash and cargo-area environments. However, per the AD7811/AD7812 datasheet, the AD7812YNZ is not AEC-Q100 qualified; for AEC-Q100 automotive designs, choose a qualified automotive-grade ADC from the ADI portfolio rather than repurposing the AD7812YNZ.
Recommended
Recommended Products Summary
Engineering reference data for AD7812YNZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7812YRZ | AD7812YRUZ | AD7811YNZ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-PDIP (0.300 in / 7.62 mm) | 20-SOIC (surface-mount) | 20-TSSOP (surface-mount) | 20-PDIP (same as YNZ) |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits |
| Sampling Rate | 350 kSPS | 350 kSPS | 350 kSPS | 350 kSPS |
| Number of Input Channels | 8 single-ended | 8 single-ended | 8 single-ended | 4 single-ended (3 pseudo-diff) |
| Conversion Time | 2.3 µs | 2.3 µs | 2.3 µs | 2.3 µs |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C |
Key Differentiators
- 8 input channels in a single SAR ADC with on-chip mux (vs AD7811YNZ)
- Through-hole PDIP for legacy and prototype boards (vs AD7812YRZ)
- On-chip 2.5 V reference with external override (vs Bare SAR ADC without internal reference)
Design Notes
Decouple AVDD with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed as close to the AVDD pin as possible. DVDD may share the same rail as AVDD in 3.3 V or 5 V systems, but a ferrite bead between AVDD and DVDD improves PSRR against digital switching noise. Per the AD7811/AD7812 datasheet, REF decoupling at REFOUT with 10 µF + 0.1 µF is critical to achieving the rated INL/DNL.
Separate analog and digital grounds with a single star-point connection under the IC's AGND pin to prevent digital return currents from corrupting the conversion. Route the analog input traces as short, guarded differential pairs if possible, and keep them away from SCLK and DOUT. Per the AD7811/AD7812 datasheet evaluation board layout, the REFIN trace should be guarded by AGND on both sides.
Do not leave REFOUT floating when using an external reference at REFIN - the datasheet specifies that the internal reference must be disabled by appropriate pin strapping to prevent contention. Also, ensure CONVST is held low long enough (>= 25 ns) to initiate a valid conversion, otherwise the internal state machine may not start. The part is obsolete; for new designs consider the AD7812YRZ (SOIC) or a modern pin-compatible SAR ADC.
Compliance Information
RoHS-compliant per Analog Devices product page. Not AEC-Q100 qualified - do not use for automotive safety-critical applications. Lifecycle status is obsolete; consult last-time-buy programs for production continuity.
