Part A
AD5422BREZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5465 PCS
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Not a drop-in replacement
The AD5422BREZ and AD5429YRU are not functionally interchangeable. The AD5422BREZ is a single-channel 16-bit current/voltage output DAC with HART connectivity, while the AD5429YRU is a dual-channel 8-bit current output DAC with no voltage output or HART support. They differ in resolution, channel count, output configuration, and communication interface, making direct substitution infeasible without significant redesign.
Different resolution
Different channel count
Different output type
Different interface
Parts at a glance
Part B
AD5429YRU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 970 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5422BREZ | AD5429YRU | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 8 bit | Determines the smallest output step and overall accuracy; a 16-bit DAC offers far finer control than an 8-bit DAC. |
| Number of DAC Channels | 1 | 2 | Channel count dictates how many independent analog outputs can be driven from a single package. |
| Output Type | Current and Voltage | Current | Defines whether the device can source a voltage output, a current loop, or both, affecting loop-powered and voltage-mode applications. |
| Interface Type | SPI | I2C | The serial protocol must match the host controller; SPI and I2C are not directly interchangeable without a bridge. |
| Supply Voltage Range | 10.8 V to 40 V (AVDD) | 2.5 V to 5.5 V | Supply range determines compatibility with the system power rail and suitability for industrial high-voltage loops versus low-voltage logic systems. |
| Package Type | 24-Lead TSSOP | 16-Lead TSSOP | Package footprint and pin count affect PCB layout, thermal performance, and mechanical drop-in compatibility. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +85°C | Wider temperature ratings support harsher industrial environments and affect reliability margins. |
| Output Current Range | 0 mA to 24 mA (programmable) | 0 mA to 20 mA | Current output span must match the actuator or loop requirement; programmable ranges offer more flexibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5422BREZ | AD5429YRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| Number of D/A Converters | - | 2 |
| Settling Time | 25µs (V), 40µs (A) (Typ) | 120ns |
| Output Type | Voltage or Current - Buffered | Current - Unbuffered |
| Differential Output | No | Yes |
| Data Interface | SPI, DSP | SPI, DSP |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 10.8V ~ 40V, -3V ~ 26.4V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| INL / DNL(LSB) | - | ±0.5 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Base Product Number | AD5422 | - |
| Number of D / A Converters | 1 | - |
| INL / DNL (LSB) | -, ±1.3 (Max) | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
Frequently asked questions
What are the primary functional differences between the AD5422BREZ and the AD5429YRU?
The AD5422BREZ is a single-channel, 16-bit, serial-input, voltage and current-output DAC with HART connectivity, designed for industrial process control. The AD5429YRU is a dual-channel, 8-bit, serial-input, voltage-output DAC with a multiplying reference input, intended for general-purpose applications. They differ in resolution, channel count, output type, and target application.
Are the AD5422BREZ and AD5429YRU pin-compatible or package-compatible?
No. The AD5422BREZ is offered in a 24-lead TSSOP (RE-24-1) package, while the AD5429YRU is offered in a 16-lead TSSOP (RU-16) package. The pin counts, pin functions, and package dimensions differ, so they are not drop-in replacements.
Can the AD5422BREZ and AD5429YRU operate from the same supply voltages?
No. The AD5422BREZ requires an AVDD of +12 V to +40 V (or ±12 V to ±20 V) for its output stage and a DVDD of +2.7 V to +5.5 V for digital logic. The AD5429YRU operates from a single +2.5 V to +5.5 V supply. Their supply requirements and tolerances are not interchangeable.
Do both devices support current-loop output for industrial 4-20 mA applications?
Only the AD5422BREZ provides a current output. It integrates a 4-20 mA current-loop driver with HART signal injection capability. The AD5429YRU provides voltage outputs only and does not include a current-loop driver.
How do the digital interfaces of the AD5422BREZ and AD5429YRU compare?
Both use a serial interface, but they are not identical. The AD5422BREZ uses a 3-wire SPI-compatible interface with a dedicated FAULT pin and supports daisy-chain operation. The AD5429YRU uses a 3-wire SPI-compatible interface with a separate LDAC pin for simultaneous updates. Protocol timing, register maps, and command sets differ between the two devices.
What are the resolution and accuracy specifications for each device?
The AD5422BREZ offers 16-bit resolution with integral nonlinearity (INL) of ±0.006% FSR maximum for the voltage output and ±0.01% FSR maximum for the current output. The AD5429YRU offers 8-bit resolution with INL of ±0.5 LSB maximum. The AD5422BREZ provides significantly higher precision and lower drift.
Are the AD5422BREZ and AD5429YRU interchangeable in existing designs?
No. Due to differences in package, pinout, supply voltage, resolution, output configuration, and internal register architecture, they cannot be interchanged without a complete redesign of the PCB, power supply, and firmware. Each device must be evaluated against the specific requirements of the target application.