AD7707BRUZ-REEL - 16-Bit Sigma-Delta ADC | Analog Devices
MPN: AD7707BRUZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.4 | $16.40 |
| 10 | $14.76 | $147.60 |
| 100 | $13.12 | $1,312.00 |
| 500 | $11.48 | $5,740.00 |
| 1,000 | $9.84 | $9,840.00 |
AD7707BRUZ-REEL Overview
A sigma-delta ADC is a converter architecture that uses oversampling and noise-shaping to achieve high resolution at low bandwidth; the AD7707 is part of that converter family, which sits within the broader analog-to-digital converter (ADC) category, itself a sub-category of data-conversion ICs and of the larger power management and signal-chain semiconductor hierarchy. The sigma-delta topology enables the AD7707 to integrate a digital filter, programmable gain amplifier, and reference circuitry on a single chip, removing the need for external signal-conditioning components in most thermocouple, strain-gauge, and process-control front ends.
Key features include a true 16-bit analog front end with programmable gain amplifier (PGA) for low-level inputs, ±10 V high-level differential inputs, an on-chip digital filter, on-chip calibration, and a low-power 3 V/5 V supply interface. Typical supply current is around 1 mW (3 V/5 V operation), enabling battery-powered measurement instruments without external amplifiers. The serial interface simplifies galvanic isolation, while the 20-TSSOP outline supports compact industrial PC-board layouts.
The sigma-delta converter architecture delivers intrinsic monotonicity, low integral non-linearity, and excellent noise immunity due to the modulator's oversampling ratio. The integrated digital filter provides programmable first-notch frequency, allowing trade-offs between output data rate and effective resolution for different transducer bandwidths. Combined with the on-chip PGA, the AD7707 can resolve microvolt-level sensor outputs without additional analog stages.
Typical applications include industrial process-control analog front ends, weigh-scale signal conditioning, temperature measurement with thermocouples or RTDs, pressure and flow instrumentation, and battery-powered portable measurement equipment. The ±10 V differential input range also supports general-purpose data-acquisition boards using 4-20 mA loop-powered transducers.
When designing with this device, allocate the analog and digital supply pins (AVDD/DVDD) properly and decouple each with a 0.1 µF ceramic capacitor close to the package. Avoid running digital clock traces under the analog input pins to prevent digital-noise coupling into the front-end input.
This page synthesises distributor live pricing, drop-in pin-compatible alternatives and practical design notes that consolidate information from the Analog Devices datasheet, DigiKey, Mouser, and the FindIC cross-reference database.
Drop-in alternatives for AD7707BRUZ-REEL — 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:
AD7707BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRUZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRU
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRU-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRUZ-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Number of Input Channels | 3 (2 differential / 1 configurable) |
| ADC Architecture | Sigma-Delta |
| Differential Inputs | 2 |
| Input Voltage Range | -10 V to +10 V |
| Accuracy | ±0.003% |
| Missing Codes | 16 bits, no missing codes |
| Supply Voltage | 3 V / 5 V |
| Supply Current / Power | 1 mW typical (3 V / 5 V) |
| Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| On-Chip Features | PGA, digital filter, calibration |
| Package | 20-TSSOP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C |
| Screening Level | Industrial |
AD7707BRUZ-REEL Pin Configuration
| Pin 1 | AIN1+ — Differential analog input 1, positive |
| Pin 2 | AIN1- — Differential analog input 1, negative |
| Pin 3 | AIN2+ — Differential analog input 2, positive |
| Pin 4 | AIN2- — Differential analog input 2, negative |
| Pin 5 | AIN3 — Single-ended analog input 3 |
| Pin 6 | REFIN+ — Reference input, positive |
| Pin 7 | REFIN- — Reference input, negative / analog common |
| Pin 8 | MCLK IN — Master clock input |
| Pin 9 | MCLK OUT — Master clock output (crystal driver) |
| Pin 10 | AGND — Analog ground |
| Pin 11 | DGND — Digital ground |
| Pin 12 | RESET — Reset input, active low |
| Pin 13 | CS — Chip select, active low |
| Pin 14 | SCLK — Serial clock |
| Pin 15 | DIN — Serial data input |
| Pin 16 | DOUT — Serial data output |
| Pin 17 | DRDY — Data ready output, active low |
| Pin 18 | STANDBY — Standby input, active low |
| Pin 19 | DVDD — Digital supply (3 V or 5 V) |
| Pin 20 | AVDD — Analog supply (3 V or 5 V) |
Typical Applications
AD7707BRUZ-REEL is suitable for 6 applications: Industrial Weigh-Scale Front End, Thermocouple Temperature Measurement, RTD / Resistance Bridge Readout, Battery-Powered Portable Data Logger, Process-Control Analog Input Module, Strain-Gauge Pressure Sensor Front End.
Industrial Weigh-Scale Front End
The AD7707BRUZ-REEL's 16-bit no-missing-code performance and integrated PGA make it ideal for load-cell signal conditioning in bench and floor scales weighing 1 kg to 100 kg. The on-chip digital filter rejects mains-borne 50 Hz/60 Hz interference, and the ±0.003% accuracy enables an effective OIML/NTEP resolution envelope without external instrumentation amps. Designers place the part between the bridge load cell and the microcontroller, calibrate zero-scale and full-scale via the on-chip calibration registers at production to remove sensor offset, and read the result on a single SPI/MICROWIRE bus. Compared with discrete op-amp + ADC solutions, the AD7707 cuts the front end from six chips to one, shrinking PCB area and BOM cost.
Recommended
Thermocouple Temperature Measurement
The AD7707BRUZ-REEL is well suited to K-/J-/T-type thermocouple conditioning in industrial furnaces, refrigeration monitoring and HVAC controllers. The device accepts microvolt-level inputs directly through the integrated PGA, and combined with software cold-junction compensation yields overall measurement accuracy suitable for ±1 °C error budgets. The 3-input architecture handles reference-junction sensing plus redundancy on a single chip. Add an external NTC or RTD for cold-junction compensation, reference the AD7707 to a low-drift ADR03 (or equivalent) reference, and configure the digital filter notch at the mains frequency for best effective resolution.
Recommended
RTD / Resistance Bridge Readout
The AD7707BRUZ-REEL interfaces directly to Pt100/Pt1000 RTDs and bridge-style pressure transducers in process-control and medical monitoring instruments. The two differential input pairs and the third dedicated channel handle dual-RTD or RTD-plus-pressure designs without an analog multiplexer. The on-chip PGA provides the gain required for low-resistance sensor bridges without external instrumentation amplifiers, while the digital filter removes mains pickup from long sensor leads. Use the AD7707 in unbuffered mode with the internal reference for cost-effective designs, or supply an external low-noise reference for higher accuracy.
Recommended
Battery-Powered Portable Data Logger
With 1 mW typical dissipation at 3 V operation, the AD7707BRUZ-REEL is well matched to battery-powered field data loggers and handheld multimeters. The serial interface simplifies isolation, and the device can be placed in standby by writing a calibration-config register, drawing only leakage current between conversions. Designers can run the part from two AA cells via a boost + LDO, configure the digital-filter first-notch to 10 Hz to reject 50/60 Hz pickup, and wake up on demand for hourly engineering readings. The wide operating temperature of -40 °C to +85 °C supports outdoor deployment.
Recommended
Process-Control Analog Input Module
The AD7707BRUZ-REEL is engineered into 4-20 mA loop-powered input modules that interface with PLC analog front ends, particularly in PLC/DCS systems. The ±10 V differential input range directly accepts the unipolar 0-10 V or bipolar -10 V to +10 V signals used in industrial racks, eliminating an external attenuator. The serial interface simplifies opto-isolated design, and on-chip calibration allows in-system re-trim every time a new transducer is attached. The 20-TSSOP outline saves board area in dense analog input cards where density of channels is a primary concern.
Recommended
Strain-Gauge Pressure Sensor Front End
The AD7707BRUZ-REEL conditions low-amplitude strain-gauge bridge outputs in pressure transducers, flow meters and load cells used in industrial automation. The device's integrated PGA gains the millivolt-level bridge output to full-scale, and the digital filter removes mechanical noise and EMI from pump installations. The on-chip calibration routine compensates for transducer zero drift over temperature, while the serial interface reduces the I/O count needed to talk to the system microcontroller, freeing pins for other signals.
Recommended
Recommended Products Summary
Engineering reference data for AD7707BRUZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7707BRUZ | AD7707BRUZ-REEL7 | AD7707BRU | AD7707BRU-REEL7 | AD7707BRZ-REEL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 3 | 3 | 3 | 3 | 3 | 3 |
| Input Voltage Range | -10 V to +10 V | -10 V to +10 V | -10 V to +10 V | -10 V to +10 V | -10 V to +10 V | -10 V to +10 V |
| Supply Voltage | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V | 3 V / 5 V |
| Packaging Option | Tape & Reel (13-inch) | Tube | Tape & Reel (7-inch) | Tube (legacy) | Reel 7-inch (legacy) | Tape & Reel (7-inch, RoHS-prefix code) |
| RoHS Status | Compliant | Compliant | Compliant | Legacy (pre-RoHS) | Legacy | Compliant |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Full -10 V to +10 V bipolar input range on-chip (vs AD7707BRUZ (tube variant))
- Integrated PGA plus 16-bit sigma-delta ADC plus digital filter (vs AD7707BRU (legacy non-RoHS code))
- 3-input architecture in the same 20-TSSOP outline (vs AD7705 family)
Design Notes
Decouple AVDD and DVDD separately with 10 µF tantalum + 0.1 µF ceramic capacitors placed as close as possible to each pin. According to the AD7707 datasheet, separate analog and digital ground planes joined only at a single point under the package reduce noise coupling. If the device is operated from a switching regulator, place an LDO such as ADP7104 in the analog path to keep converter reference noise below 1 mVrms.
Route analog input traces over a continuous analog ground plane and keep digital clock traces (MCLK, SCLK) on the opposite side. Keep analog input traces away from the MCLK output crystal traces, and use a guard ring around the analog input pin. For ±10 V inputs place a TVS such as SMAJ series at each AIN± for ESD/transient protection, particularly if the front end sits in a long-cable industrial environment.
After a hardware reset, the AD7707 enters a calibration state and requires an on-board zero-scale and full-scale calibration before accurate readings are available. According to the manufacturer datasheet, omitting the calibration routine results in offsets up to several LSB. Drive the RESET pin low for at least 100 ns, then run the self-calibration sequence in firmware before the first measurement.
Compliance Information
RoHS-compliant per DigiKey product page; REACH supported by manufacturer markings; AEC-Q100 not applicable - this is a general-purpose industrial-temperature ADC, not an automotive-qualified part.
