Part A
AD7190BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3979 PCS
- Package
- TSSOP-24
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7191BRUZ and AD7190BRUZ share the same 24-bit sigma-delta architecture, TSSOP-24 footprint, and SPI interface, making them functionally interchangeable in many precision measurement designs. However, the AD7191BRUZ offers a reduced feature set with lower output data rate and no PGA bypass flexibility compared to the AD7190BRUZ, so designers must validate gain settings, filter configuration, and throughput requirements before substituting in applications demanding the AD7190's higher performance envelope.
Package Type
High match
Resolution
High match
Output Data Rate
Validation required
PGA Gain Range
Validation required
Parts at a glance
Part B
AD7191BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4961 PCS
- Package
- TSSOP-24
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7191BRUZ | AD7190BRUZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit sigma-delta ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 2 differential | 2 differential / 4 pseudo-differential | The AD7190 offers more flexible input configurations, which affects system design when multiple sensor inputs must be multiplexed. |
| Maximum output data rate | 4.7 SPS to 4.8 kSPS | 4.7 SPS to 4.8 kSPS | Identical data-rate range means both suit similar sampling requirements for precision measurement. |
| PGA gain range | 1 to 128 | 1 to 128 | Matching programmable gain ranges allow both to interface directly with low-level sensor signals. |
| Interface | SPI | SPI | Same serial interface simplifies firmware and hardware reuse between the two parts. |
| Supply voltage | 2.7 V to 5.25 V (AVDD), 2.7 V to 5.25 V (DVDD) | 2.7 V to 5.25 V (AVDD), 2.7 V to 5.25 V (DVDD) | Identical supply requirements mean the same power rail design can support either device. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Same package and pin count allow potential board-level drop-in compatibility. |
| Internal oscillator | No | No | Neither integrates an oscillator, so both require an external clock source in the design. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +105 °C | Identical temperature ratings mean both are suitable for the same industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7190BRUZ | AD7191BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Number of Inputs | 2, 4 | 2 |
| Input Type | Differential, Pseudo-Differential | Differential |
| Data Interface | SPI, DSP | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 3V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key architectural differences between the AD7191BRUZ and AD7190BRUZ?
The AD7191BRUZ is a pin-programmable, low-noise 24-bit sigma-delta ADC with a fixed gain stage and selectable output data rates, while the AD7190BRUZ is a 24-bit sigma-delta ADC with an SPI-compatible serial interface, programmable gain amplifier (PGA) settings from 1 to 128, and flexible digital filtering options. The AD7191 offers simplified configuration via hardware pins, whereas the AD7190 provides full register-based configurability through its serial interface.
Do the AD7191BRUZ and AD7190BRUZ share the same package and pinout?
Both devices are offered in a 24-lead TSSOP (RU-24) package, but their pin functions differ. The AD7191BRUZ uses dedicated pins for gain and output data rate selection, while the AD7190BRUZ uses those pins for SPI communication (SCLK, DIN, DOUT, CS) and synchronization. Therefore, they are not pin-for-pin compatible and cannot be dropped into the same PCB footprint without redesign.
How do the programmable gain amplifier specifications compare between the two parts?
The AD7190BRUZ integrates a PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct interfacing with low-level sensors. The AD7191BRUZ provides a fixed gain of 128, optimized for direct bridge/sensor connections. Designs requiring variable gain scaling should use the AD7190BRUZ.
What are the maximum output data rates for the AD7191BRUZ and AD7190BRUZ?
The AD7190BRUZ supports output data rates from 4.7 Hz to 4.8 kHz, programmable through its register interface. The AD7191BRUZ offers selectable output data rates of 10 Hz, 50 Hz, 60 Hz, and 120 Hz via hardware pin configuration. The AD7190BRUZ therefore provides a wider and higher-speed range suitable for higher-throughput applications.
Which device is better suited for precision weigh-scale or bridge sensor applications?
Both devices target precision sensor applications. The AD7190BRUZ offers greater flexibility with its programmable PGA and digital filter, making it suitable for a broad range of weigh-scale and bridge sensor designs requiring configurable gain and rejection settings. The AD7191BRUZ, with its fixed gain of 128 and pin-selectable data rates, is optimized for simplified, fixed-configuration bridge sensor systems where hardware-only configuration is preferred.
How do the interface requirements differ between the AD7191BRUZ and AD7190BRUZ?
The AD7190BRUZ requires an SPI-compatible 3- or 4-wire serial interface for register configuration and data readback, needing a microcontroller or DSP. The AD7191BRUZ is configured entirely through hardware pins (gain and data rate selection) and provides a simple serial data output, reducing firmware complexity and host processor requirements.
Are the AD7191BRUZ and AD7190BRUZ interchangeable in an existing design?
No. Despite both being 24-bit sigma-delta ADCs in 24-lead TSSOP packages, they differ in pin function, configuration method, gain options, and output data rate ranges. A direct substitution is not possible; any replacement requires schematic and firmware changes validated against the respective manufacturer datasheets.