Part A
AD9744ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1927 PCS
- Package
- WFQFN-32
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ACPZ and AD9748ACP are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same 32-lead LFCSP package, sharing a compatible serial interface and supply architecture. However, they differ in maximum update rate and resolution-related dynamic performance, so the AD9748ACP should be validated against the AD9744ACPZ's clock rate and spectral requirements before being adopted as a drop-in substitute.
Resolution
High match
Maximum Update Rate
Validation required
Package Type
High match
Dynamic Performance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9744ACPZ | AD9748ACP | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 8 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers far finer quantization than an 8-bit DAC, so they are not functionally interchangeable in precision applications. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Sampling Rate (Update Rate) | 210 MSPS | 210 MSPS | Maximum update rate defines the signal bandwidth the DAC can synthesize; matching rates means both suit similar high-speed signal generation. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external output stage; identical output architecture supports similar analog front-end design. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Matching supply ranges allow the parts to operate from the same rails, simplifying power design and substitution. |
| Data Interface | Parallel CMOS | Parallel CMOS | A parallel CMOS interface means both connect to the same digital source with similar timing, easing drop-in replacement at the interface level. |
| Package / Mounting | 32-LFCSP (5x5), Surface Mount | 32-LFCSP (5x5), Surface Mount | Identical package and footprint allow physical interchangeability on the same PCB land pattern. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges mean both are suitable for the same environmental conditions. |
| INL / DNL Linearity | ±1.5 LSB INL (typ), ±0.5 LSB DNL (typ) | ±0.1 LSB INL (typ), ±0.1 LSB DNL (typ) | Linearity specs differ due to resolution; the 8-bit part achieves tighter LSB-referenced linearity, but absolute accuracy differs, affecting precision-critical substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ACPZ | AD9748ACP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 11ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | - |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | - |
| INL / DNL(LSB) | ±0.8, ±0.5 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9744ACPZ and the AD9748ACP?
The AD9744ACPZ is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9748ACP is an 8-bit, 210 MSPS TxDAC. Both are members of the same pin-compatible TxDAC family from Analog Devices, but they differ in resolution (14-bit vs. 8-bit), which directly affects dynamic performance metrics such as SNR and SFDR.
Are the AD9744ACPZ and AD9748ACP pin-compatible?
Yes. Both devices are offered in the same 32-lead LFCSP (CP-32) package and belong to the same TxDAC family, so they share a common pinout. This allows a single PCB layout to accommodate either device, though the resolution difference means the digital input bus width differs (14 bits vs. 8 bits).
Do the AD9744ACPZ and AD9748ACP have the same maximum update rate?
Yes. Both the AD9744ACPZ and the AD9748ACP are specified for a maximum update rate of 210 MSPS, making them suitable for the same high-speed signal synthesis applications.
What is the resolution difference and how does it affect performance?
The AD9744ACPZ provides 14-bit resolution, while the AD9748ACP provides 8-bit resolution. The higher resolution of the AD9744ACPZ yields lower quantization noise and better SNR/SFDR performance, which is important in applications such as broadband communications and instrumentation. The AD9748ACP offers a lower-cost option where 8-bit resolution is sufficient.
Do both devices operate from the same supply voltage?
Yes. Both the AD9744ACPZ and the AD9748ACP operate from a single 3.0 V to 3.6 V supply and are specified for a nominal 3.3 V supply, consistent with the TxDAC family architecture.
Can the AD9748ACP be used as a drop-in replacement for the AD9744ACPZ?
Not directly as a functional equivalent. Although the devices are pin-compatible and share the same package and update rate, the AD9748ACP has 8-bit resolution versus 14 bits for the AD9744ACPZ. The digital input interface and resulting output resolution differ, so system performance requirements and the digital data path must be revalidated before substitution.
What are typical applications for these TxDAC converters?
Both the AD9744ACPZ and AD9748ACP are intended for high-speed signal synthesis applications such as broadband communication systems, base stations, instrumentation, and direct digital synthesis (DDS) systems. The AD9744ACPZ is preferred where higher resolution and dynamic range are required, while the AD9748ACP suits cost-sensitive designs with lower resolution needs.