Part A
AD5542AARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7554 PCS
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD5547BRUZ and AD5542AARUZ are not drop-in replacements for each other. Although both are Analog Devices precision DACs sharing a TSSOP-28 style footprint and similar SPI-compatible serial interfaces, they differ fundamentally in architecture, resolution, channel count, and reference configuration. The AD5547BRUZ is a dual-channel 16-bit current-output multiplying DAC, while the AD5542AARUZ is a single-channel 16-bit voltage-output DAC. These differences in output type, channel count, internal reference, and output amplifier integration make direct substitution impractical without significant circuit redesign.
Different output type
Different channel count
Different reference architecture
Different output amplifier integration
Parts at a glance
Part B
AD5547BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1919 PCS
- Package
- TSSOP-38
- Series
- Data Acquisition - Digital to Analog Converters (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 | AD5547BRUZ | AD5542AARUZ | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 2 | 1 | Determines how many independent analog outputs are available; a dual-channel part cannot be directly replaced by a single-channel part in multi-output designs. |
| Resolution | 16 bits | 16 bits | Resolution sets the smallest analog step size; matching resolution is essential for equivalent output precision. |
| DAC Architecture | R-2R current output | R-2R voltage output | Current-output versus voltage-output architectures require different external signal conditioning, affecting direct substitutability. |
| Output Type | Current (unbuffered) | Voltage (buffered) | A current-output DAC needs an external I-V converter, while a voltage-output DAC can drive loads directly, changing board-level design. |
| Interface Type | Parallel | SPI / Serial | The digital interface must match the host controller; parallel and serial interfaces are not pin- or protocol-compatible. |
| Supply Voltage (Analog) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Analog supply range must be compatible with the system rails for correct operation. |
| Reference Input | External | External | Both require an external reference, so reference circuitry can often be reused across designs. |
| Package | 28-Lead TSSOP | 16-Lead TSSOP | Different package footprints and pin counts prevent drop-in replacement on an existing PCB. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching temperature ranges ensure both parts meet the same environmental requirements. |
| Settling Time | 1 µs | 1 µs | Settling time affects achievable update rates and dynamic accuracy in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5542AARUZ | AD5547BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | AD5542 | - |
| Number of Bits | 16 | 16 |
| Number of D / A Converters | 1 | - |
| Settling Time | 1µs (Typ) | 500ns (Typ) |
| Output Type | Voltage - Unbuffered | Current - Unbuffered |
| Differential Output | No | No |
| Data Interface | SPI, DSP | Parallel |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| INL / DNL (LSB) | ±0.5, ±0.5 | - |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Number of D/A Converters | - | 2 |
| INL / DNL(LSB) | - | ±2 (Max), ±1 (Max) |
Frequently asked questions
What are the key architectural differences between the AD5547BRUZ and the AD5542AARUZ?
The AD5547BRUZ is a dual-channel, 16-bit, current-output multiplying DAC with an on-chip 4-quadrant resistor network, while the AD5542AARUZ is a single-channel, 16-bit, voltage-output DAC with an internal reference buffer and a 4-quadrant multiplying mode. The AD5547BRUZ requires an external op-amp for current-to-voltage conversion, whereas the AD5542AARUZ integrates a precision output amplifier.
Are the AD5547BRUZ and AD5542AARUZ pin-compatible or package-compatible?
No. The AD5547BRUZ is supplied in a 24-lead TSSOP (RU-24) package, while the AD5542AARUZ is supplied in a 16-lead TSSOP (RU-16). The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What is the resolution and INL specification of each device?
Both devices are 16-bit DACs. The AD5547BRUZ offers ±1 LSB INL (B grade) over the operating temperature range. The AD5542AARUZ offers ±1 LSB INL (A grade) at 25°C, with typical drift characteristics specified in the datasheet. Always verify the exact grade suffix against the manufacturer datasheet for the required temperature range.
Which device supports dual-channel operation and which is single-channel?
The AD5547BRUZ is a dual-channel DAC, providing two independent 16-bit DAC outputs in one package. The AD5542AARUZ is a single-channel DAC. If the application requires two simultaneous analog outputs, the AD5547BRUZ is the appropriate choice; if only one output is needed, the AD5542AARUZ may be used.
What are the output configuration differences between the AD5547BRUZ and AD5542AARUZ?
The AD5547BRUZ provides a current output (I-OUT) and requires an external operational amplifier to convert the current to a voltage. The AD5542AARUZ provides a buffered voltage output directly, simplifying the analog signal chain. This difference affects external component count, board space, and settling time budgeting.
Can the AD5542AARUZ replace the AD5547BRUZ in an existing dual-channel design?
No. The AD5542AARUZ is a single-channel device and cannot provide two independent DAC outputs. Replacing a dual-channel AD5547BRUZ with a single-channel AD5542AARUZ would require two AD5542AARUZ devices, additional board space, and a revised PCB layout, and the output configuration (voltage vs. current) would also need to be revalidated.
What interface and reference requirements apply to each device?
Both devices use a serial SPI-compatible interface. The AD5547BRUZ requires an external reference voltage and an external op-amp for current-to-voltage conversion. The AD5542AARUZ includes an internal reference buffer and operates with an external reference voltage; it does not require an external op-amp for its voltage output. Verify the exact reference input range and SPI timing from the respective datasheets.
Which device is better suited for multiplying DAC applications?
Both devices support 4-quadrant multiplying operation. The AD5547BRUZ is a current-output multiplying DAC, making it suitable for applications requiring wide bandwidth multiplication and external op-amp flexibility. The AD5542AARUZ also supports multiplying mode but provides a voltage output with an internal buffer. The choice depends on whether the system requires current-mode or voltage-mode signal processing.