Part A
AD9747BCPZRL
ADI公司
- Lifecycle
- Active
- Stock
- 2001 件
- Package
- LFCSP-72
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Not a drop-in replacement
The AD9742ACPZ and AD9747BCPZRL are not drop-in replacements for one another. Although both are dual-channel high-speed DACs from Analog Devices, they differ in resolution, output interface, supply voltage, and package footprint, so a direct substitution is not possible without redesign and validation.
Different resolution
Different output interface
Different supply voltage
Different package footprint
Parts at a glance
Part B
AD9742ACPZ
ADI公司
- Lifecycle
- Active
- Stock
- 1312 件
- Package
- LFCSP-32
- Series
- 資料獲取-數模轉換器（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 | AD9742ACPZ | AD9747BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 16 bit | Higher resolution provides finer output granularity and lower quantization noise, which directly affects signal fidelity in reconstruction applications. |
| Number of DAC Channels | 1 | 2 | Dual channels enable I/Q or multi-tone transmit architectures from a single device, whereas a single channel requires two separate DACs. |
| Maximum Update Rate | 210 MSPS | 250 MSPS | The update rate sets the maximum synthesizable signal bandwidth and determines suitability for high-frequency transmit applications. |
| Output Type | Current (differential) | Current (differential) | Both provide differential current outputs, but the interface and compliance requirements differ, affecting the external output network design. |
| Supply Voltage | 3.0 V to 3.6 V | 1.8 V and 3.3 V (dual supply) | Supply requirements determine power rail design and compatibility with the surrounding digital and analog circuitry. |
| Digital Interface | Parallel CMOS | LVDS (dual-port) | The digital input interface affects FPGA/ASIC pin count, board routing complexity, and achievable data throughput. |
| Package | 32-lead LFCSP | 40-lead LFCSP | Package footprint and pinout differences prevent direct drop-in replacement and require PCB layout changes. |
| Power Consumption | 135 mW (typical at 210 MSPS) | 315 mW (typical at 250 MSPS) | Power dissipation impacts thermal design, supply sizing, and suitability for power-constrained systems. |
| SFDR | 84 dBc (at 10 MHz output) | 80 dBc (at 10 MHz output) | Spurious-free dynamic range indicates spectral purity and determines achievable signal-to-noise performance in the transmit chain. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9747BCPZRL | AD9742ACPZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| 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 | ±0.5, ±0.4 |
| 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 architectural differences between the AD9742ACPZ and AD9747BCPZRL?
The AD9742ACPZ is a single-channel, 12-bit, 210 MSPS TxDAC digital-to-analog converter with a parallel CMOS input interface. The AD9747BCPZRL is a dual-channel, 16-bit, 250 MSPS DAC with a serial LVDS input interface, on-chip numeric controlled oscillator (NCO), and digital interpolation filters. The AD9747 offers higher resolution, higher sample rate, dual-channel operation, and integrated digital signal processing features not present in the AD9742.
Are the AD9742ACPZ and AD9747BCPZRL pin-compatible or package-compatible?
No. The AD9742ACPZ is supplied in a 32-lead LFCSP (5 mm × 5 mm) package, while the AD9747BCPZRL is supplied in a 72-lead LFCSP (10 mm × 10 mm) package. The pin counts, package footprints, and pin functions differ, so they are not drop-in replacements for each other.
What are the maximum update rates and resolutions of these two DACs?
The AD9742ACPZ provides 12-bit resolution at a maximum update rate of 210 MSPS. The AD9747BCPZRL provides 16-bit resolution at a maximum update rate of 250 MSPS. The AD9747 therefore offers four additional bits of resolution and a higher maximum sample rate.
Do both devices support the same digital input interface?
No. The AD9742ACPZ uses a parallel CMOS input interface for its 12-bit data word. The AD9747BCPZRL uses a serial LVDS input interface. This difference affects FPGA/ASIC pin allocation, PCB routing, and timing closure, so the digital source must be configured accordingly for each device.
Does the AD9747BCPZRL include digital signal processing features that the AD9742ACPZ lacks?
Yes. The AD9747BCPZRL integrates digital interpolation filters and a numerically controlled oscillator (NCO) for frequency upconversion, which the AD9742ACPZ does not include. These features make the AD9747 suited to transmit signal chains requiring digital upconversion, while the AD9742 is a simpler baseband DAC.
What are the typical supply voltage requirements for each device?
The AD9742ACPZ operates from a single 3.0 V to 3.6 V analog supply (with a separate digital supply of 2.7 V to 3.6 V) and includes an on-chip 1.2 V reference. The AD9747BCPZRL operates from 1.8 V and 3.3 V supplies. Designers must verify the exact supply rail requirements and sequencing in the respective manufacturer datasheets before layout.
Which device is more appropriate for a dual-channel I/Q transmit application?
The AD9747BCPZRL is the more appropriate choice for dual-channel I/Q transmit applications because it is a dual 16-bit DAC with integrated NCO and interpolation, allowing both I and Q paths to be processed in a single package. The AD9742ACPZ is a single-channel 12-bit DAC, so a dual-channel application would require two devices plus external digital upconversion logic.
Can the AD9742ACPZ be used as a direct replacement for the AD9747BCPZRL in an existing design?
No. The two devices differ in resolution (12-bit vs 16-bit), channel count (single vs dual), input interface (parallel CMOS vs serial LVDS), package (32-lead vs 72-lead LFCSP), and integrated DSP features. A direct replacement is not possible without redesigning the digital interface, PCB footprint, and signal chain, and revalidating performance against the manufacturer datasheets.