Part A
AD5420AREZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2718 個数
- Package
- TSSOP-24
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD5420AREZ and AD5428YRU are not functionally interchangeable. The AD5420AREZ is a single-channel 16-bit current-output DAC with HART connectivity, while the AD5428YRU is a dual-channel 8-bit voltage-output DAC with parallel interface. They differ fundamentally in resolution, output type, channel count, and digital interface, making direct substitution impossible without complete system redesign.
Different output type
Different resolution
Different channel count
Different digital interface
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5420AREZ | AD5428YRU | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 8 bit | Higher resolution allows finer analog output steps, directly affecting achievable setpoint accuracy and control loop precision. |
| Number of DAC Channels | 1 | 2 | Channel count determines how many independent analog outputs the device can drive, affecting board-level channel density and system architecture. |
| Output Type | Current (4 mA to 20 mA) | Voltage (unbuffered) | Current-loop versus voltage output dictates the interface type to the load and whether external loop supply and compliance circuitry are required. |
| Interface | SPI | Parallel | The digital interface must match the host controller's available bus, affecting pin count, wiring, and firmware complexity. |
| Supply Voltage | AVDD 10.8 V to 40 V; DVDD 2.7 V to 5.5 V | 2.5 V to 5.5 V | Supply range determines compatibility with the system power rails and whether level shifting or additional regulation is needed. |
| Package | 24-Lead TSSOP (exposed pad) | 20-Lead TSSOP | Package footprint and thermal characteristics affect PCB layout, heat dissipation, and drop-in substitutability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The temperature range defines the environments in which the part can be reliably operated, impacting industrial versus extended-temperature applications. |
| INL (Integral Nonlinearity) | ±0.012% FSR typical | ±0.25 LSB typical | INL quantifies deviation from an ideal transfer function and directly bounds the accuracy achievable in precision control applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5420AREZ | AD5428YRU |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| Number of D/A Converters | 1 | 2 |
| Settling Time | 40µs | 120ns |
| Output Type | Current - Buffered | Current - Unbuffered |
| Differential Output | No | No |
| Data Interface | SPI, DSP | Parallel |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 10.8V ~ 40V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| INL / DNL(LSB) | -, ±1 (Max) | ±0.25 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the primary functional differences between the AD5420AREZ and the AD5428YRU?
The AD5420AREZ is a single-channel, 16-bit, serial-input, 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA current-output DAC designed for industrial process control. The AD5428YRU is a dual-channel, 8-bit, parallel-input, voltage-output DAC with a 5 V reference input range, intended for general-purpose digital-to-analog conversion. They differ in resolution, number of channels, output type, and digital interface.
Are the AD5420AREZ and AD5428YRU pin-compatible or package-compatible?
No. The AD5420AREZ is supplied in a 24-lead TSSOP (RE-24-1) package, while the AD5428YRU is supplied in a 20-lead TSSOP (RU-20) package. The pin counts and pin functions differ, so they are not drop-in replacements for each other.
Can the AD5420AREZ and AD5428YRU operate from the same supply voltage?
No. The AD5420AREZ requires an AVDD supply of 10.8 V to 40 V for its current-output stage, with a separate DVDD of 2.7 V to 5.5 V for the digital interface. The AD5428YRU operates from a single 2.5 V to 5.5 V supply. Their supply requirements and voltage domains are not interchangeable.
Which device is suitable for 4 mA to 20 mA industrial current-loop applications?
The AD5420AREZ is the appropriate choice. It is specifically designed to provide a unipolar or bipolar current output, including the 4 mA to 20 mA range, for industrial control loops. The AD5428YRU provides a voltage output and is not intended for direct current-loop drive.
How do the digital interfaces of the AD5420AREZ and AD5428YRU differ?
The AD5420AREZ uses a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. The AD5428YRU uses an 8-bit parallel interface with CS, WR, and data bus lines. The interface type and timing requirements are not compatible between the two devices.
Do the AD5420AREZ and AD5428YRU have the same resolution and channel count?
No. The AD5420AREZ is a single-channel, 16-bit DAC. The AD5428YRU is a dual-channel, 8-bit DAC. Resolution and channel count are fundamentally different, affecting both performance and system architecture.
Can the AD5428YRU be used as a direct substitute for the AD5420AREZ in an existing design?
No. Due to differences in package, pinout, supply voltage, output type, resolution, channel count, and digital interface, the AD5428YRU cannot directly replace the AD5420AREZ. Any substitution would require a complete redesign of the PCB, power supply, and control firmware.