Part A
AD9744ACPZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2452 PCS
- Package
- LFCSP-32
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9744ACPZRL7 and AD9746BCPZRL are not drop-in replacements for one another. Although both are dual-channel high-speed DACs from the same family, they differ in resolution, output architecture, and dynamic performance, so the AD9746BCPZRL cannot be substituted directly for the AD9744ACPZRL7 without design validation.
Different resolution
Different output architecture
Different dynamic performance
Different supply headroom
Parts at a glance
Part B
AD9746BCPZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5608 PCS
- Package
- VFQFN-72
- 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 | AD9746BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 14 bit | Bit depth determines the quantization precision and achievable dynamic range of the DAC output. |
| Number of DAC Channels | 1 | 2 | Single vs dual channel determines whether one device can drive I/Q or two independent signal paths, affecting board architecture and substitutability. |
| Update Rate (Max) | 210 MSPS | 250 MSPS | Maximum sample rate sets the achievable output bandwidth and must meet the signal generation requirements of the application. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture determines the external output network and whether the device can directly replace another in the signal chain. |
| Supply Voltage | 3.0 V to 3.6 V | 3.1 V to 3.5 V | Operating supply range must be compatible with the board's power rail to ensure reliable operation and drop-in compatibility. |
| Package / Case | 32-LFCSP (5x5) | 32-LFCSP (5x5) | Package and footprint must match for physical board-level substitutability without layout changes. |
| Interface | Parallel | Parallel | Digital interface type must match the driving logic and timing to allow direct replacement in the system. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range must cover the application environment for both parts to be interchangeable in the same conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ACPZRL7 | AD9746BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 14 | 14 |
| Number of D/A Converters | 1 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±0.8, ±0.5 | ±1, ±0.5 |
| Architecture | Current Source | Quad-Switch |
| 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 AD9746BCPZRL?
The AD9744ACPZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9746BCPZRL is a dual 14-bit, 250 MSPS TxDAC. The AD9744 is a single-channel device, whereas the AD9746 integrates two DAC cores in one package, making it suitable for I/Q transmit architectures. Both are specified for operation from a 3.3 V analog supply and a 1.8 V to 3.3 V digital supply, but their channel count, sample rate, and power consumption differ.
Are the AD9744ACPZRL7 and AD9746BCPZRL pin-compatible?
No. The AD9744ACPZRL7 is offered in a 32-lead LFCSP package, and the AD9746BCPZRL is offered in a 48-lead LFCSP package. The different package sizes and pin counts mean the two devices are not pin-compatible and cannot be dropped into the same PCB land pattern without redesign.
What are the maximum sample rates of these two DACs?
The AD9744ACPZRL7 supports a maximum update rate of 210 MSPS. The AD9746BCPZRL supports a maximum update rate of 250 MSPS per DAC channel. Both figures are specified in the respective manufacturer datasheets.
What resolution do the AD9744ACPZRL7 and AD9746BCPZRL provide?
Both devices are 14-bit resolution digital-to-analog converters. The AD9744ACPZRL7 provides a single 14-bit DAC channel, and the AD9746BCPZRL provides two independent 14-bit DAC channels.
What are the supply voltage requirements for these components?
Both the AD9744ACPZRL7 and the AD9746BCPZRL operate with a 3.3 V analog supply and a separate digital supply that can range from 1.8 V to 3.3 V, per the manufacturer datasheets. The dual-channel AD9746 typically consumes more total power than the single-channel AD9744 due to its second DAC core.
Which device is better suited for I/Q transmit applications?
The AD9746BCPZRL is better suited for I/Q transmit applications because it integrates two matched 14-bit DAC channels in a single package, which supports coherent dual-channel signal generation. The AD9744ACPZRL7 is a single-channel DAC and would require two separate devices to implement an I/Q pair.
Can the AD9744ACPZRL7 be used as a substitute for the AD9746BCPZRL?
No, they are not direct substitutes. The AD9744ACPZRL7 is a single-channel 14-bit DAC in a 32-lead LFCSP, while the AD9746BCPZRL is a dual-channel 14-bit DAC in a 48-lead LFCSP with a higher maximum sample rate. Substitution would require a PCB redesign and validation of channel count, sample rate, and interface timing against the target design.
What digital interface do these DACs use?
Both the AD9744ACPZRL7 and the AD9746BCPZRL use a parallel CMOS-compatible digital input interface for loading 14-bit data words, as specified in their manufacturer datasheets. The AD9746 provides separate data ports for its two DAC channels.