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 AD5424YRU are not functionally interchangeable. The AD5420AREZ is a single-channel 16-bit serial-input 4-20 mA current-loop DAC in a 24-lead TSSOP, while the AD5424YRU is a dual-channel 8-bit parallel-input voltage-output DAC in a 16-lead TSSOP. They differ in resolution, output type, digital interface, channel count, and package footprint, so direct substitution is not feasible without a complete hardware and firmware redesign.
Different output type
Different resolution
Different digital interface
Different channel count
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 | AD5424YRU | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 8 bit | Determines the finest output step size; a 16-bit DAC offers 256 times finer resolution than an 8-bit DAC, directly affecting achievable accuracy and control precision. |
| Number of DAC Channels | 1 | 2 | Channel count dictates how many independent analog outputs are available; a two-channel part can replace two single-channel parts in multi-output designs. |
| Output Type | Current (4 mA to 20 mA) | Voltage (unbuffered) | Current-loop and voltage outputs serve fundamentally different interface standards; they are not directly interchangeable in a given signal chain. |
| Interface | SPI | Parallel | The digital interface must match the host controller; SPI and parallel interfaces require different pin counts, timing, and firmware. |
| Supply Voltage | 10.8 V to 40 V (AVDD) | 2.5 V to 5.5 V (VDD) | Supply range determines compatibility with the system power rail; the two parts operate in entirely different voltage domains. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The temperature grade affects suitability for industrial or automotive environments and long-term reliability margins. |
| Package / Mounting | 24-Lead TSSOP | 16-Lead TSSOP | Package footprint and pin count affect PCB layout, board space, and whether a drop-in replacement is physically possible. |
| INL (Integral Nonlinearity) | ±0.05 % FSR max | ±0.5 LSB max | INL quantifies deviation from an ideal transfer function and is a primary accuracy specification for precision control loops. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5420AREZ | AD5424YRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 40µs | 120ns |
| Output Type | Current - Buffered | Current - Unbuffered |
| Differential Output | No | Yes |
| 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), ±0.5 (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 AD5424YRU?
The AD5420AREZ is a single-channel, 16-bit serial input 4-20 mA current loop DAC with HART connectivity, designed for industrial process control. The AD5424YRU is an 8-bit, parallel input multiplying DAC (MDAC) with a current output, intended for general-purpose signal processing and multiplying applications. They differ in resolution, output type, interface, and target application.
Are the AD5420AREZ and AD5424YRU pin-to-pin or package compatible?
No. The AD5420AREZ is offered in a 24-lead TSSOP (RE-24-1) package, while the AD5424YRU is supplied in a 16-lead TSSOP (RU-16). The pin counts, pin functions, and package footprints are different, so they are not drop-in replacements.
Can the AD5420AREZ and AD5424YRU operate from the same supply voltage?
No. The AD5420AREZ requires an AVDD supply of 10.8 V to 40 V (or 5 V for some configurations) and a DVDD of 2.7 V to 5.5 V, reflecting its industrial current-loop drive requirements. The AD5424YRU operates from a single 2.5 V to 5.5 V supply (VDD) and a reference input, which is typical for low-voltage MDACs. Their supply ranges and power domains are not interchangeable.
Do the AD5420AREZ and AD5424YRU have the same digital interface?
No. The AD5420AREZ uses a 3-wire or 4-wire serial interface (SPI/QSPI/MICROWIRE/DSP compatible) for configuration and data writing. The AD5424YRU uses an 8-bit parallel interface with CS, WR, and data bus lines. The interface protocols and timing requirements are fundamentally different.
What is the output configuration of each device?
The AD5420AREZ provides a current output specifically designed to drive 4-20 mA current loops, with on-chip fault detection and HART signal coupling capability. The AD5424YRU provides a current output (IOUT) that is a product of the reference current and the digital input code, typically used with an external op-amp for voltage-mode operation. The AD5420AREZ is optimized for loop-powered industrial transmitters, while the AD5424YRU is a general-purpose multiplying DAC.
Are the AD5420AREZ and AD5424YRU interchangeable in existing designs?
No. Due to differences in resolution (16-bit vs. 8-bit), interface (serial vs. parallel), package (24-lead vs. 16-lead TSSOP), supply requirements, and output architecture, these devices are not interchangeable. A redesign of the PCB, firmware, and analog front end would be required to substitute one for the other.
Which device is better suited for industrial 4-20 mA transmitter applications?
The AD5420AREZ is specifically designed for industrial 4-20 mA current-loop applications, featuring 16-bit resolution, HART connectivity, and robust fault protection. The AD5424YRU is not intended for direct 4-20 mA loop drive and lacks the integrated loop interface and industrial protection features of the AD5420AREZ.
Do both devices support the same operating temperature range?
Both devices are specified for the industrial temperature range of −40°C to +85°C (or −40°C to +105°C for some grades), but the exact temperature grade depends on the specific ordering part number. Designers should verify the datasheet for the precise grade of each ordered part. The AD5420AREZ and AD5424YRU are not identical in all temperature-grade options.