AD7190WBRUZ 24-Bit Sigma-Delta ADC: Specs, Design Guide, Alternatives & Availability

Quick Answers: What Is the AD7190WBRUZ and Where Can You Buy It?

The AD7190WBRUZ is a 24-bit sigma-delta analog-to-digital converter (ADC) from Analog Devices with a maximum output data rate of 4.8 kSPS, two differential or four pseudo-differential input channels, a built-in programmable gain amplifier (PGA), and an SPI interface in a compact 24-lead TSSOP package. It operates from a 5 V analog supply and a 2.7 V to 5.25 V digital supply across the -40°C to +105°C range, and it is RoHS compliant. As of 2026-08-22, the part is in active lifecycle status with 99,999 units in stock at XAIPART and a verified 1ku price of $35.00. This combination makes the AD7190WBRUZ a practical choice for weigh scales, industrial process control, medical monitoring equipment, RTD/thermocouple temperature measurement, portable instrumentation, and precision data acquisition systems.

A sigma-delta ADC samples the input many times and applies digital filtering to move quantization noise out of the signal band, delivering very high resolution at low signal frequencies. With a complete analog front end — input mux, PGA, chopper-stabilized amplifier, and configurable digital filter — the AD7190WBRUZ sits between the analog sensor and the digital processor, converting tiny analog signals into serial digital words over standard SPI commands compatible with most microcontrollers and DSPs.

Buyers can check the parametric database and request inventory allocations on the AD7190WBRUZ product page. The 99,999-unit stock level and MOQ of 1 mean both prototype and production quantities are available today, and tier pricing rewards volume: $60.00 at 1+, $43.33 at 10+, $38.33 at 100+, $36.67 at 500+, and $35.00 at 1000+ (as of 2026-08-22).

Technical Guide: How to Select, Design In, and Use the AD7190WBRUZ

Selection Criteria

Choose the AD7190WBRUZ when your application needs 24-bit no-missing-codes resolution on low-frequency signals. The sigma-delta architecture and integrated PGA allow direct connection to millivolt-level transducers such as load cells, pressure sensors, and thermocouples without an external precision amplifier. The input multiplexer supports two differential or four pseudo-differential channels, so one ADC can serve multi-sensor panels. For most weigh scale controllers and industrial transmitters, the 4.8 kSPS maximum output data rate is more than sufficient for real-time weight and pressure monitoring.

Power Supply Design

Power AVDD from a clean 5 V rail and DVDD from 2.7 V to 5.25 V, which lets the digital interface sit on either 3.3 V or 5 V logic. Decouple AVDD with high-quality capacitors, as outlined in the Analog Devices datasheet, and pay close attention to the analog reference and power supplies. The device supports an internal clock option, so an external master clock is optional; if a system clock is used, connect it to MCLK.

Reference and Ratiometric Measurement

The AD7190WBRUZ requires an external reference. The reference inputs REFIN1+/REFIN1- and REFIN2+/REFIN2- enable ratiometric measurements: tie the reference to the bridge excitation voltage so that supply drift cancels in the conversion. This is the classic configuration for load-cell weigh scales and RTD front ends.

SPI Interface and Digital Control

Connect the four SPI lines — SCLK, DIN, DOUT/RDY, and CS — to a fast host port to take full advantage of the 4.8 kSPS throughput. DOUT/RDY doubles as a data-ready strobe. Use SYNC to synchronize conversions in multi-device systems, RESET for a known startup state, and MODE to select operating mode. The device continuously converts and the host reads serial data with standard SPI commands.

PGA Calibration and Noise

The PGA's gain levels suit millivolt-level sensor outputs, but its sensitivity to input offsets must be calibrated during system initialization. The digital filter can be configured for different output rates and settling times, trading speed for noise performance. At the 4.8 kSPS ceiling, the host must be ready to read conversions at roughly one every 208 µs to avoid overrun.

Package and Thermal Design

The 24-lead TSSOP is a compact surface-mount package that facilitates dense PCB layouts. The -40°C to +105°C operating temperature range makes the device suitable for industrial and automotive environments, while RoHS compliance simplifies lead-free manufacturing.

Application Design Notes

Weight scales: connect the load-cell bridge to AIN1+/AIN1- and use the bridge excitation as the external reference for a ratiometric conversion. The 24-bit core and PGA resolve millivolt outputs, and the 4.8 kSPS rate supports real-time weight updates.

Industrial process control: use the device for pressure and temperature transmitters; its wide -40°C to +105°C range suits factory floors, and the SPI interface drops into PLC backplanes and microcontroller front ends.

Medical monitoring: the low noise and 24-bit resolution preserve small physiological signals, while the compact TSSOP helps shrink portable monitors.

RTD/thermocouple measurement: the PGA amplifies small thermocouple voltages and the external reference enables ratiometric RTD excitation, improving accuracy.

Portable instrumentation: low power and the compact package support battery-powered handheld multimeters and data loggers; PGA gain reduces external parts.

Precision data acquisition systems: standard SPI commands allow seamless integration with data-acquisition boards, and 4.8 kSPS supports high-throughput laboratory measurements.

Verification Checklist

• Confirm AVDD = 5 V and DVDD within 2.7 V to 5.25 V before powering the digital interface.
• Ensure the external reference is clean and stable; use it for ratiometric measurements where possible.
• Decouple AVDD with high-quality capacitors placed close to the 24-TSSOP pins.
• Connect SCLK, DIN, DOUT/RDY, and CS to a fast SPI host so 4.8 kSPS conversions can be read without overrun.
• Calibrate PGA input offsets during system initialization, as required by the datasheet guidance.
• Route the input mux channels (AIN1+, AIN1-, AIN2+, AIN2-) with short, guarded traces to preserve 24-bit performance.

Alternatives & Comparison: Drop-In Options for the AD7190WBRUZ

Three alternatives exist in the XAIPART database. AD7191BRUZ is a lower-cost 24-bit sigma-delta ADC in the same package and pinout. AD7192BRUZ is a higher-accuracy 24-bit sigma-delta ADC in the same package and pinout. ADS1256IDB is a cross-brand 24-bit delta-sigma ADC with a similar pinout; verify compatibility before substituting. The AD7190BRUZ (without the 'W') is functionally identical — the 'W' suffix indicates the wider -40°C to +105°C temperature range.

For a true drop-in replacement with identical footprint, start with AD7191BRUZ (lower cost) or AD7192BRUZ (higher accuracy). Treat ADS1256IDB as a redesign candidate rather than an automatic drop-in, because its pinout is only similar and compatibility must be verified pin-by-pin. Note that the AD7190WBRUZ and AD7190BRUZ share the same package and pinout, so the wide-temperature 'W' variant can be swapped directly when the application requires -40°C to +105°C operation.

Industry Insight: Lifecycle, Stock, and Supply Situation

The AD7190WBRUZ is in active lifecycle status, confirming that Analog Devices continues to manufacture and support the part. XAIPART lists 99,999 units in stock as of 2026-08-22 with a minimum order quantity of 1, so both prototype and production requirements can ship without a long lead-time wait.

The verified tier pricing as of 2026-08-22 is $60.00 for 1+, $43.33 for 10+, $38.33 for 100+, $36.67 for 500+, and $35.00 for 1000+. This pricing profile is typical of a mature, high-precision ADC in active production. The part is also reported in stock at major distribution channels as of 2026-08-21 for same-day shipment, which shortens procurement risk further.

Global market share figures for this specific part are not included in the verified XAIPART database; buyers should request current allocation and lead-time data from their preferred distribution channel.

Trends & Outlook: What Buyers Should Watch for the AD7190WBRUZ

Precision industrial measurement continues to consolidate around 24-bit sigma-delta ADCs with integrated PGAs, because a single part replaces an analog front end that once required multiple op-amps and a separate ADC. The AD7190WBRUZ's verified 4.8 kSPS maximum output data rate and 24-bit no-missing-codes performance keep it relevant for weigh scale controllers, process transmitters, and medical monitors.

Buyers should watch four things. First, price: the verified 1ku price of $35.00 as of 2026-08-22 anchors cost models, while the $36.67 tier at 500+ makes medium-volume orders nearly as efficient as full 1ku buys. Second, supply: active lifecycle status plus 99,999 units in stock at XAIPART (MOQ 1) minimizes lead time; as of 2026-08-21 the part is also available for same-day shipment at major distribution. Third, second-source planning: AD7191BRUZ (lower cost) and AD7192BRUZ (higher accuracy) share the same package and pinout, so a qualified second source is available without a PCB change. Fourth, long-term design flexibility: evaluate ADS1256IDB only after confirming pin-level compatibility, because the database describes its pinout only as similar.

The external-reference architecture supports ratiometric bridge measurement, which remains a best practice for load cells and RTDs because it cancels supply drift. The RoHS-compliant, -40°C to +105°C rating also keeps the part qualified for industrial and automotive environments as your bill of materials evolves. In short, the AD7190WBRUZ remains a reliable, actively produced 24-bit sigma-delta ADC whose verified pricing, stock, and drop-in alternatives make it a low-risk choice for precision measurement designs today and into the next several product generations.