Part A
AD9747BCPZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2001 PCS
- Package
- LFCSP-72
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9744ACPZRL7 and AD9747BCPZRL are not functionally interchangeable: they differ in resolution, channel count, output interface, and package footprint, so the AD9747BCPZRL cannot directly replace the AD9744ACPZRL7 without a board redesign and system-level revalidation.
Different resolution
Different channel count
Different output interface
Different package footprint
Parts at a glance
Part B
AD9744ACPZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2452 PCS
- Package
- LFCSP-32
- 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 | AD9744ACPZRL7 | AD9747BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 16 bit | Higher resolution provides finer output quantization and lower quantization noise, which directly affects signal fidelity in DAC applications. |
| Number of DAC Channels | 1 | 2 | A dual-channel DAC can drive two independent signal paths (e.g., I/Q) in one package, while a single-channel part requires two devices. |
| Maximum Update Rate | 210 MSPS | 250 MSPS | The update rate sets the maximum synthesizable signal bandwidth and determines suitability for high-speed transmit applications. |
| Output Type | Current (unbuffered) | Current (buffered) | Buffered current outputs simplify interfacing and reduce external component count, while unbuffered outputs may offer different compliance and settling behavior. |
| Supply Voltage | 3.0 V to 3.6 V | 1.8 V to 3.3 V | Supply voltage compatibility determines whether the part can be used directly in a given rail architecture without additional regulation. |
| Package | 32-lead LFCSP | 40-lead LFCSP | Package footprint and pin count affect PCB layout, thermal performance, and whether a drop-in replacement is possible. |
| Power Consumption | 135 mW (typical at 210 MSPS) | 330 mW (typical at 250 MSPS) | Power dissipation impacts thermal design and system efficiency, especially in densely packed or power-sensitive designs. |
| Interface Type | Parallel CMOS | Parallel CMOS | The digital input interface must match the driving logic and pin count; both use parallel CMOS but differ in bus width due to resolution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range ensures reliable operation across the same environmental conditions for both parts. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9747BCPZRL | AD9744ACPZRL7 |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 14 |
| Number of D/A Converters | 2 | 1 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | 2.7V ~ 3.6V |
| INL / DNL(LSB) | ±4, ±2 | ±0.8, ±0.5 |
| Architecture | Quad-Switch | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | - | TxDAC® |
| Settling Time | - | 11ns (Typ) |
Frequently asked questions
What are the key differences between the AD9744ACPZRL7 and the AD9747BCPZRL?
The AD9744ACPZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9747BCPZRL is a dual 16-bit, 250 MSPS DAC. The AD9747 offers higher resolution and a faster update rate, and integrates two DAC channels in a single package, whereas the AD9744 is a single-channel device.
Are the AD9744ACPZRL7 and AD9747BCPZRL pin-compatible?
No. The AD9744ACPZRL7 is supplied in a 32-lead LFCSP package, and the AD9747BCPZRL is supplied in a 72-lead LFCSP package. The different package sizes and pin counts mean they are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
What is the maximum update rate of each device?
The AD9744ACPZRL7 supports a maximum update rate of 210 MSPS. The AD9747BCPZRL supports a maximum update rate of 250 MSPS. Both figures are specified in the respective manufacturer datasheets.
How do the resolutions of the two DACs compare?
The AD9744ACPZRL7 provides 14-bit resolution, while the AD9747BCPZRL provides 16-bit resolution. The higher resolution of the AD9747 yields finer amplitude quantization and lower quantization noise, which can be advantageous in demanding signal-synthesis applications.
Do both parts support the same digital input interface?
Both devices accept parallel digital input data, but the interface width differs according to resolution: the AD9744ACPZRL7 uses a 14-bit parallel input, and the AD9747BCPZRL uses a 16-bit parallel input per channel. Designers must account for the different bus widths when migrating between the two parts.
Can the AD9744ACPZRL7 be used as a drop-in replacement for the AD9747BCPZRL?
No. Beyond the package and pin-count differences, the AD9747BCPZRL is a dual-channel 16-bit DAC while the AD9744ACPZRL7 is a single-channel 14-bit DAC. Channel count, resolution, interface width, and footprint all differ, so a direct drop-in replacement is not possible.
What are the typical applications for each device?
The AD9744ACPZRL7 is typically used in single-channel transmit paths such as wireless base station transmitters, instrumentation, and direct digital synthesis. The AD9747BCPZRL, with its dual 16-bit channels and 250 MSPS update rate, is suited to multi-channel transmit architectures, wideband communications systems, and applications requiring higher dynamic range.