Part A
AD5544BRSZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7094 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD5544BRSZ and AD5545BRU are not drop-in replacements for each other. Although both are quad-channel 16-bit current-output DACs from Analog Devices, they differ in digital interface protocol, package footprint, reference architecture, and output configuration, requiring hardware and firmware redesign for substitution.
Different digital interface
Different package footprint
Different reference architecture
Different output configuration
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5544BRSZ | AD5545BRU | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 4 | 2 | Determines how many independent analog outputs are available; a 4-channel device cannot be directly substituted where 2 channels suffice, and vice versa affects board layout and channel count. |
| Resolution | 16 bits | 16 bits | Both provide 16-bit resolution, so precision and LSB size are equivalent, supporting similar accuracy requirements. |
| Interface Type | SPI | SPI | Both use a serial SPI interface, allowing similar microcontroller or FPGA connectivity and firmware compatibility. |
| Package / Case | 28-Lead SOIC | 16-Lead TSSOP | Different footprints and pin counts require different PCB layouts; they are not drop-in replacements without board redesign. |
| Supply Voltage (Analog) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical analog supply range means both can operate from the same system rails without level shifting. |
| Reference Input | External | External | Both require an external voltage reference, so system reference design can be shared between the two parts. |
| Output Type | Current (I-out) | Current (I-out) | Both are current-output DACs, requiring an external I-to-V converter; the signal chain architecture is similar. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range supports use in the same environmental conditions. |
| Settling Time | 1 µs | 1 µs | Equivalent settling time means both are suitable for similar update-rate and dynamic performance requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5544BRSZ | AD5545BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Number of D/A Converters | 4 | 2 |
| Settling Time | 900ns (Typ) | 500ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | No | No |
| Data Interface | SPI | SPI |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 5V |
| INL / DNL(LSB) | ±1 (Max), ±1 (Max) | ±2 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD5544BRSZ and AD5545BRU?
The AD5544BRSZ is a quad 16-bit current-output DAC in a 28-lead SSOP, while the AD5545BRU is a dual 16-bit current-output DAC in a 16-lead TSSOP. The AD5544 provides four independent DAC channels, whereas the AD5545 provides two. Both use a serial SPI-compatible interface and operate from a 2.7 V to 5.5 V supply, but they differ in channel count, package, and pin configuration.
Are the AD5544BRSZ and AD5545BRU pin-compatible?
No. The AD5544BRSZ uses a 28-lead SSOP package, and the AD5545BRU uses a 16-lead TSSOP package. They have different pin counts, pinouts, and PCB land patterns, so they are not pin-compatible and cannot be interchanged without a board redesign.
Do the AD5544BRSZ and AD5545BRU have the same resolution and DAC architecture?
Yes. Both are 16-bit current-output DACs with a multiplying bandwidth suitable for multiplying applications. Each channel provides 16-bit resolution with ±1 LSB INL and DNL specifications as stated in the respective Analog Devices datasheets.
Can the AD5544BRSZ and AD5545BRU operate from the same supply voltage?
Yes. Both devices are specified for a single supply range of 2.7 V to 5.5 V and also support dual-supply operation. The AD5544 and AD5545 datasheets list the same supply voltage range, so system-level supply requirements are compatible.
What serial interface do the AD5544BRSZ and AD5545BRU use?
Both devices use a 3-wire SPI-compatible serial interface with separate SDIN, SCLK, and SYNC/CS pins. The interface supports daisy-chain operation and is compatible with standard microcontrollers and DSPs. Data is clocked into a serial input register and then transferred to the DAC registers.
Are the AD5544BRSZ and AD5545BRU available in RoHS-compliant packages?
Yes. The AD5544BRSZ is a RoHS-compliant 28-lead SSOP, and the AD5545BRU is a RoHS-compliant 16-lead TSSOP. The "Z" suffix on the AD5544BRSZ and the "RU" suffix on the AD5545BRU indicate Pb-free, RoHS-compliant packaging per Analog Devices ordering information.
Which part should be selected for a design requiring four DAC channels?
The AD5544BRSZ should be selected for a four-channel design because it integrates four independent 16-bit DACs in a single 28-lead SSOP. The AD5545BRU provides only two channels, so two AD5545 devices would be required to achieve four channels, increasing board space and component count.
Do the AD5544BRSZ and AD5545BRU have the same reference input configuration?
Both devices provide a reference input per DAC channel and support external reference voltages. The AD5544 has four VREF pins (one per channel), and the AD5545 has two VREF pins. The reference input voltage range and input impedance specifications are similar, but the exact values should be verified in the respective datasheets for the target operating conditions.