AD7811YRZ-REEL7 - 10-Bit 350kSPS 4-Ch SAR ADC | Analog Devices
MPN: AD7811YRZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
AD7811YRZ-REEL7 Overview
A successive-approximation ADC is a sampling converter that uses an internal binary-weighted capacitive DAC and a comparator to perform a bit-at-a-time conversion, combining small die area and very low power consumption with deterministic throughput. The AD7811 family sits at the lower end of the SAR performance spectrum: slower than 1 MSPS pipeline ADCs but with no pipeline latency, lower glitch, and excellent DC accuracy for instrumentation and process-control loops. In the broader signal-chain hierarchy it belongs to the data-converter IC class, which is itself a sub-category of mixed-signal ICs under power management and analog signal-chain products. The AD7811's on-chip reference removes a common external BOM line, while the flexible input MUX eliminates an external analog switch tree for low-channel-count designs.
Key features include 2.3 µs conversion time, four analog input channels software-mapped to three pseudo-differential pairs, an internal 2.5 V reference with the option of an external reference override, a hardware/software conversion start input, and a software-controlled power-down mode. The serial interface supports daisy-chaining so two devices can share a single DSP serial bus by hard-wiring different device-address pins. Industrial-grade -40 °C to +105 °C operation is supported, making the part suitable for factory-floor embedded modules.
In typical applications the AD7811 is used as a general-purpose 10-bit digitiser in process-control front ends, portable battery-powered instrumentation, DSP front-end digitisation, multi-zone temperature or sensor monitoring with external signal conditioning, and industrial data-acquisition boards. Because the part integrates both the reference and the track/hold, designers can shrink the analog front end to a small RC anti-alias filter and a few bypass capacitors.
Design consideration: place a 0.1 µF ceramic bypass close to VDD and a 10 µF tantalum or ceramic bulk capacitor; keep analog and digital ground returns separated under the IC and join them only at the board's star-point ground. The internal reference settles in microseconds, but conversions started immediately after power-up may show 1-2 LSB extra offset until the reference settles, so issue a dummy conversion during firmware init.
Drop-in alternatives for AD7811YRZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7811YRZ-REEL7 (same form factor and footprint) — differing in Number of Channels, Operating Temperature, Package, Architecture, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7811YRZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7812YRZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7811YRZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7472ARUZ-REEL
✅ Drop-In✓ In Stock
$6.4 / Unit
View Datasheet →AD7265BCPZ-REEL
✅ Drop-In✓ In Stock
$8.15 / Unit
View Datasheet →AD7811YRZ-REEL7 Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Channels | 4 single-ended / 3 pseudo-differential |
| Conversion Time | 2.3 µs |
| Sampling Rate | 350 kSPS |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage | 2.7 V to 5.5 V (single supply) |
| Input Voltage Range | 0.0 V to 3.6 V (with internal reference) |
| On-Chip Reference | 2.5 V (internal, external override supported) |
| Data Interface | Serial, DSP-compatible |
| Track/Hold Amplifier | On-chip |
| Package | 16-SOIC (0.150 inch, 3.90 mm width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +105 °C (Industrial) |
| Packaging | Tape & Reel (REEL7 - 7-inch reel) |
| Power-Down Mode | Software-controlled |
| RoHS Status | Compliant |
AD7811YRZ-REEL7 Pin Configuration
| Pin 1 | VIN1 — Analog input channel 1 (single-ended or pseudo-diff positive) |
| Pin 2 | VIN2 — Analog input channel 2 (single-ended or pseudo-diff positive) |
| Pin 3 | VIN3 — Analog input channel 3 (single-ended or pseudo-diff positive) |
| Pin 4 | VIN4 — Analog input channel 4 (single-ended only) |
| Pin 5 | DOUT — Serial data output (DSP/MCU compatible) |
| Pin 6 | SCLK — Serial interface clock input |
| Pin 7 | CONVST — Conversion start input (rising edge initiates conversion) |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | ADDRESS — Device address select for multi-device serial bus sharing |
| Pin 10 | REF — 2.5 V reference in/out (decouple with 0.1 µF + 10 µF) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | AGND — Analog ground |
| Pin 13 | VDD — Positive supply (2.7 V to 5.5 V); decouple with 0.1 µF + 10 µF |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | DGND — Digital ground (tie to AGND at single-point star) |
Typical Applications
AD7811YRZ-REEL7 is suitable for 6 applications: Industrial Process Control Front-End, Portable Battery-Powered Instrumentation, DSP Front-End Digitisation, Multi-Zone Temperature / Sensor Monitoring, Closed-Loop Motor / Actuator Feedback, Data-Acquisition Card Plug-In Modules.
Industrial Process Control Front-End
The AD7811YRZ-REEL7 is a strong fit for industrial process-control front ends where 10-bit accuracy over 0-3.6 V inputs is sufficient for transducer digitisation. Its 350 kSPS throughput comfortably digitises multiplexed thermocouple, RTD, or 4-20 mA shunt signals at hundreds of Hz per channel, and the internal 2.5 V reference eliminates one external component. Placed behind a low-pass anti-alias RC filter on each of four inputs, it shares its serial bus with the host MCU or DSP and uses software power-down between conversions to minimise board quiescent current.
Recommended
Portable Battery-Powered Instrumentation
The AD7811YRZ-REEL7's 2.7-5.5 V single-supply operation and software power-down to microampere-level current make it ideal for handheld multimeters, data loggers, and field-portable test gear. Its 350 kSPS throughput is far above what slow-sensor logging needs, but lets the host oversample and average for noise reduction. The internal track/hold amplifier eliminates the need for an external buffer, and the SOIC-16 footprint occupies only ~30 mm² of PCB area - critical for compact portable enclosures.
Recommended
DSP Front-End Digitisation
The AD7811YRZ-REEL7's DSP-compatible serial interface lets it stream converted data directly into the synchronous serial port of Analog Devices ADSP-21xx or TI TMS320-family DSPs without glue logic. Its deterministic SAR latency - no pipeline delay - makes code simpler because each conversion result is ready exactly N clock cycles after the start edge. Two AD7811s can share one DSP serial bus by hard-wiring different device-address pins, doubling channel count without adding an SPI controller.
Recommended
Multi-Zone Temperature / Sensor Monitoring
The AD7811YRZ-REEL7's four-input MUX lets one ADC monitor four thermistor or RTD-divider signals in sequence, replacing four single-channel ADCs in multi-zone HVAC, refrigeration, or rack-monitoring applications. Pseudo-differential configuration rejects common-mode noise injected by long sensor cables - a major benefit in industrial wiring where ground bounce is common. With its 350 kSPS throughput the part can scan all four zones in <12 µs, leaving the host MCU free for comms and housekeeping.
Recommended
Closed-Loop Motor / Actuator Feedback
In closed-loop position, current, or velocity feedback the AD7811YRZ-REEL7 digitises shunt current or position-potentiometer voltages at 350 kSPS with no pipeline delay - a key advantage over pipeline ADCs whose latency complicates PID loop tuning. The 10-bit resolution is sufficient for non-precision actuator drivers (fans, pumps, conveyor motors) where cost-per-channel matters. Its industrial -40 to +105 °C rating supports underhood and motor-housing ambient temperatures.
Recommended
Data-Acquisition Card Plug-In Modules
The AD7811YRZ-REEL7 is widely used in legacy PC/104, CompactPCI, and micro-controller plug-in DAQ cards where 10-bit accuracy and a 16-pin narrow-SOIC footprint minimise board area and BOM cost. Its industrial -40 to +105 °C rating and surface-mount SOIC package support both slot-card and stackable-card form factors. Designers often combine two AD7811s on one SPI bus for 8-channel cards at a per-channel cost well below that of dedicated 8-channel ADCs.
Recommended
Recommended Products Summary
Engineering reference data for AD7811YRZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7811YRZ-REEL | AD7812YRZ-REEL7 | AD7472ARUZ-REEL | AD7265BCPZ-REEL |
|---|---|---|---|---|---|
| Package | 16-SOIC (0.150 inch) | 16-SOIC (0.150 inch) - same | 16-SOIC (0.150 inch) - same | TSSOP-16 (compatible family) | LFCSP-32 / SOIC compatible |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 10 bits | 10 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 350 kSPS | 350 kSPS | 350 kSPS | 1 MSPS | 1 MSPS |
| Input Channels | 4 single / 3 pseudo-diff | 4 single / 3 pseudo-diff | 4 single / 3 pseudo-diff | 1 single-ended | 2 differential |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | External only | External only |
| 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 | 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 +85 °C | -40 °C to +105 °C |
Key Differentiators
- Drop-in same-family 12-bit upgrade path on identical SOIC-16 footprint (vs AD7812YRZ-REEL7)
- Internal 2.5 V reference eliminates a BOM line and PCB area (vs AD7472ARUZ-REEL)
- Pseudo-differential input flexibility with single-ended mode (vs AD7265BCPZ-REEL (true differential only))
Design Notes
Decouple VDD (pin 13) with a 0.1 µF X7R ceramic placed within 3 mm of the pin, plus a 10 µF tantalum or ceramic bulk capacitor shared with the digital rail. Reference pin (pin 10) needs its own 0.1 µF + 10 µF decoupling stack to keep noise below 1 LSB. Software power-down (via control register bit) drops supply current to a few µA - use this aggressively in battery designs to extend runtime, but issue one dummy conversion after wake-up to flush reference-settling transients.
Keep analog (AGND, pin 12) and digital (DGND, pin 16) ground returns separated under the IC and join them at the board's single star-point ground near the power-entry or connector. Route serial-interface traces (DOUT, SCLK, CONVST, CS) on the digital side and analog input traces (VIN1-4) on the analog side; cross over at 90° only if necessary. Place anti-alias RC filters (typically 1 kΩ + 1 nF) within 5 mm of the analog input pins to avoid picking up digital switching noise before the track/hold amplifier samples the signal.
Do not leave unused analog input pins floating when using pseudo-differential mode - tie them to mid-supply (or to the COM pin) to prevent charge-injection from the input MUX injecting kickback noise into active channels. Note that AD7811YRZ-REEL7 (SOIC-16) and AD7811YRU (TSSOP-16) are NOT pin-compatible; verify your PCB footprint before substitution. The -REEL7 suffix means 7-inch tape-and-reel carrier - if your assembly line uses tube feeders, order -REEL (no 7) or -REEL7 with proper reel-handling equipment.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified - this is an industrial-grade part. Lead-free matte-tin plating. Halogen-free molding compound. Conflict-minerals declaration available from Analog Devices.
