AD7190WBRUZ - 24-Bit Sigma-Delta ADC | Analog Devices
MPN: AD7190WBRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $60 | $60.00 |
| 10 | $43.3333 | $433.33 |
| 100 | $38.3333 | $3,833.33 |
| 500 | $36.6667 | $18,333.35 |
| 1,000 | $35 | $35,000.00 |
AD7190WBRUZ Overview
A sigma-delta ADC is a converter that uses oversampling and noise shaping to achieve very high resolution. Unlike successive-approximation ADCs, sigma-delta converters sample the input many times and apply digital filtering, which moves quantization noise out of the signal band. This makes the AD7190WBRUZ well suited for low-frequency, high-accuracy measurements such as load cells, pressure sensors, temperature transducers, and precision process control loops. As an ADC, the device sits between the analog sensor and the digital processing core in a measurement system, converting tiny analog signals into serial digital words.
Key features include 24-bit no-missing-codes performance, a PGA with gain levels suitable for millivolt-level sensor outputs, and a low-noise sigma-delta architecture that minimizes error in precision bridges. The device also offers an internal clock option, simple SPI interface, and a serial read rate that supports real-time weight and pressure monitoring. The 24-lead TSSOP package is compact and facilitates dense PCB layouts.
Technically, the AD7190WBRUZ integrates a chopper-stabilized amplifier and a digital filter that can be configured for different output rates and settling times. It operates from an analog supply and supports external references, enabling ratiometric measurements. The ADC continuously converts at rates up to 4.8 kSPS, making it a practical choice for weigh scale controllers and industrial transmitters. Its digital interface is compatible with microcontrollers and DSPs through standard SPI commands.
Typical applications include industrial process control, high-precision weigh scales, medical monitoring equipment, and RTD/thermocouple temperature measurement. The device is also used in portable instrumentation where low power and high accuracy are required. For multi-channel systems, the input multiplexer allows configuration of two differential channels or four single-ended/pseudo-differential inputs.
Designers should pay attention to the analog reference and power supplies: use low-noise references and decouple AVDD with high-quality capacitors. The PGAs sensitivity to input offsets must be calibrated during system initialization. The AD7190WBRUZ supports a wide operating temperature range, making it suitable for harsh industrial environments. When pairing with a microcontroller, connect the SPI lines (SCLK, DIN, DOUT/RDY, CS) to a fast host port to take full advantage of the 4.8 kSPS throughput.
Drop-in alternatives for AD7190WBRUZ — 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 AD7190WBRUZ (same form factor and footprint) — differing in Data Interface, Input Type, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7190BRUZ
✓ In Stock
$7.6364 / Unit
View Datasheet →AD7190BRUZ-REEL
✓ In Stock
$6.5 / Unit
View Datasheet →AD7191BRUZ
📋 Reference alternative (not in catalog)
AD7192BRUZ
✓ In Stock
Contact for price
View Datasheet →ADS1256IDB
📋 Reference alternative (not in catalog)
AD7190WBRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 24 Bit |
| Number of Channels | 2 Differential, 4 Pseudo-Differential |
| Sampling Rate | 4.8 kSPS |
| Input Type | Differential, Pseudo-Differential |
| Data Interface | SPI |
| Architecture | Sigma-Delta |
| Reference Type | External |
| Voltage - Supply, Analog | 5 V |
| Voltage - Supply, Digital | 2.7 V to 5.25 V |
| Features | PGA |
| Operating Temperature Range | -40°C to +105°C |
| Package / Case | 24-TSSOP |
| Mounting Type | Surface Mount |
| Supplier Device Package | 24-TSSOP |
| Number of Bits | 24 |
| Number of Inputs | 2, 4 |
| Ratio - S/H:ADC | 0:1 |
| Number of A/D Converters | 1 |
| RoHS Status | Compliant |
AD7190WBRUZ Pin Configuration
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | DIN — Serial data input |
| Pin 3 | DOUT/RDY — Serial data output / ready |
| Pin 4 | CS — Chip select |
| Pin 5 | GND — Ground |
| Pin 6 | AVDD — Analog power supply |
| Pin 7 | AIN1+ — Analog input 1 positive |
| Pin 8 | AIN1- — Analog input 1 negative |
| Pin 9 | AIN2+ — Analog input 2 positive |
| Pin 10 | AIN2- — Analog input 2 negative |
| Pin 11 | REFIN1+ — Reference input 1 positive |
| Pin 12 | REFIN1- — Reference input 1 negative |
| Pin 13 | REFIN2+ — Reference input 2 positive |
| Pin 14 | REFIN2- — Reference input 2 negative |
| Pin 15 | P1 — Digital I/O pin |
| Pin 16 | P2 — Digital I/O pin |
| Pin 17 | SYNC — Synchronization input |
| Pin 18 | RESET — Reset input |
| Pin 19 | DVDD — Digital power supply |
| Pin 20 | DGND — Digital ground |
| Pin 21 | MCLK — Master clock input |
| Pin 22 | MODE — Mode select |
| Pin 23 | NC — No connect |
| Pin 24 | NC — No connect |
Typical Applications
AD7190WBRUZ is suitable for 6 applications: Weigh Scale Systems, Industrial Process Control, Medical Monitoring Equipment, Temperature Measurement (RTD/Thermocouple), Portable Instrumentation, Precision Data Acquisition Systems.
Weigh Scale Systems
The AD7190WBRUZ is ideal for weigh scale systems due to its 24-bit resolution, low noise, and built-in PGA. It directly interfaces with load cells, providing high accuracy and stability. The device's 4.8 kSPS output rate supports real-time weight monitoring, while the SPI interface simplifies connection to microcontrollers. Its wide temperature range ensures reliable operation in industrial environments.
Recommended
Industrial Process Control
In industrial process control, the AD7190WBRUZ provides high-resolution conversion of sensor signals such as pressure and temperature. Its sigma-delta architecture and PGA allow direct connection to transducers, reducing external components. The device's SPI interface enables easy integration with PLCs and microcontrollers, while its 4.8 kSPS rate is sufficient for most control loops. The wide operating temperature range makes it suitable for harsh factory environments.
Recommended
Medical Monitoring Equipment
The AD7190WBRUZ is used in medical monitoring equipment for precise measurement of physiological signals. Its low noise and 24-bit resolution ensure accurate data acquisition, while the PGA accommodates small sensor outputs. The device's compact TSSOP package is suitable for portable devices. The SPI interface allows seamless data transfer to processing units, and the wide temperature range supports various clinical environments.
Recommended
Temperature Measurement (RTD/Thermocouple)
The AD7190WBRUZ is well-suited for RTD and thermocouple temperature measurement. Its 24-bit resolution and low noise enable precise temperature readings, while the PGA amplifies small thermocouple voltages. The device supports ratiometric measurements with external references, improving accuracy. The SPI interface simplifies integration with microcontrollers, and the 4.8 kSPS rate allows fast temperature updates. Its wide temperature range ensures reliable operation in industrial settings.
Recommended
Portable Instrumentation
The AD7190WBRUZ is ideal for portable instrumentation due to its low power consumption and compact TSSOP package. It provides high-resolution conversion for battery-powered devices, such as handheld multimeters and data loggers. The SPI interface allows efficient communication with low-power microcontrollers. The device's wide operating temperature range ensures reliable performance in various environments, and its PGA reduces the need for external amplification, saving board space and power.
Recommended
Precision Data Acquisition Systems
The AD7190WBRUZ is a key component in precision data acquisition systems, offering 24-bit resolution and low noise for accurate signal digitization. Its sigma-delta architecture and PGA enable direct connection to various sensors, while the SPI interface facilitates integration with data acquisition boards. The device's 4.8 kSPS rate supports high-throughput measurements, and its wide temperature range makes it suitable for laboratory and industrial applications.
Recommended
Recommended Products Summary
Engineering reference data for AD7190WBRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7190BRUZ | AD7190BRUZ-REEL | AD7191BRUZ | AD7192BRUZ | ADS1256IDB |
|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 24 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit |
| Sampling Rate | 4.8 kSPS | 4.8 kSPS | 4.8 kSPS | 4.8 kSPS | 4.8 kSPS | 30 kSPS |
| Number of Channels | 2 Differential, 4 Pseudo-Differential | 2 Differential, 4 Pseudo-Differential | 2 Differential, 4 Pseudo-Differential | 2 Differential, 4 Pseudo-Differential | 2 Differential, 4 Pseudo-Differential | 8 Single-Ended, 4 Differential |
| Built-in PGA | Yes | Yes | Yes | Yes | Yes | Yes |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| Operating Temperature Range | -40°C to +105°C | -40°C to +85°C | -40°C to +85°C | -40°C to +105°C | -40°C to +105°C | -40°C to +85°C |
Key Differentiators
- Wide temperature range (-40°C to +105°C) (vs AD7190BRUZ)
- Higher accuracy than AD7191 (vs AD7191BRUZ)
- Lower noise than ADS1256 (vs ADS1256IDB)
Design Notes
Decouple the AVDD pin with a 10 µF and 0.1 µF capacitor in parallel, placed as close to the pin as possible. Use a low-noise analog supply for AVDD to maintain the ADC's noise performance. The digital supply (DVDD) can be derived from a separate 3.3 V rail, but ensure proper isolation to prevent digital noise from coupling into the analog section.
Use a solid ground plane under the ADC and keep analog and digital grounds separate, connecting them at a single point. Route the SPI lines (SCLK, DIN, DOUT/RDY, CS) away from analog inputs to minimize crosstalk. Place the reference decoupling capacitors close to the REFIN pins to ensure stable reference voltage.
Ensure the reference voltage is stable and low-noise, as it directly affects conversion accuracy. Calibrate the PGA offset and gain during system initialization to compensate for input offsets. Avoid exceeding the absolute maximum ratings on the analog inputs, as this can damage the device. Use series resistors to limit input current if overvoltage is possible.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance information not specified in the provided data.
