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 AD9742ACP are both 14-bit high-speed TxDAC converters from Analog Devices in the same 32-lead LFCSP package, sharing a common pinout and parallel CMOS input interface. The AD9744ACPZ offers a higher maximum update rate and wider specified bandwidth, making it a viable functional upgrade candidate for AD9742ACP designs, provided the system timing margin and power budget are validated against the higher-speed device.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Power Consumption
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 | AD9742ACP | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer output granularity and lower quantization error, which directly affects signal fidelity in reconstruction applications. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Sampling Rate (Max) | 210 MSPS | 210 MSPS | Maximum update rate determines the bandwidth of signals that can be synthesized; identical rates mean similar high-frequency capability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external op-amp or transformer for voltage conversion; matching output type ensures the same interface circuitry can be reused. |
| Supply Voltage (Analog & Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Compatible supply rails allow the same power design to be used without rework when substituting parts. |
| Package / Case | 32-WFQFN Exposed Pad, CSP | 32-WFQFN Exposed Pad, CSP | Identical package and footprint enable drop-in replacement on an existing PCB layout. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Matching temperature ratings ensure the substitute meets the same environmental requirements of the application. |
| INL / DNL (Typical) | ±1.5 LSB INL, ±0.5 LSB DNL | ±0.5 LSB INL, ±0.25 LSB DNL | Linearity specifications affect static accuracy; the 12-bit part has tighter LSB-referenced linearity, but the 14-bit part offers more absolute resolution. |
| Power Dissipation (Typical) | 135 mW | 135 mW | Similar power consumption means thermal design and supply sizing remain valid across the substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ACPZ | AD9742ACP |
|---|---|---|
| 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 AD9742ACP?
The AD9744ACPZ is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9742ACP is a 12-bit, 210 MSPS TxDAC. Both are pin-compatible members of the same AD974x family in a 32-lead LFCSP package, but the AD9744 provides 14-bit resolution versus 12-bit resolution on the AD9742, yielding lower quantization noise and higher SNR for the AD9744.
Are the AD9744ACPZ and AD9742ACP pin-compatible and package-compatible?
Yes. Both devices are offered in the same 32-lead LFCSP (CP-32) package with an identical pinout, which is a defining feature of the AD974x TxDAC family. This allows a common PCB footprint, though the resolution difference means the digital input word width differs (14 bits vs 12 bits).
Do the AD9744ACPZ and AD9742ACP have the same maximum update rate and supply requirements?
Both are specified for a maximum update rate of 210 MSPS and operate from a single 3.0 V to 3.6 V analog supply (with a separate 2.7 V to 3.6 V digital supply). Both are members of the same family and share comparable power dissipation characteristics at matched update rates, though exact power figures should be confirmed on each device's datasheet.
Can the AD9742ACP be replaced by the AD9744ACPZ in an existing design?
Because they share the same package and pinout, the AD9744ACPZ can often be used where an AD9742ACP was designed in, provided the digital interface is configured for 14-bit input data and the system timing and layout are validated. The higher resolution of the AD9744 generally improves performance, but the design must be verified against the AD9744 datasheet for timing, settling, and SFDR at the target update rate.
How does resolution affect the performance difference between the AD9744ACPZ and AD9742ACP?
The AD9744ACPZ's 14-bit resolution provides 4x finer quantization (16,384 codes vs 4,096 codes for the 12-bit AD9742ACP), which typically results in lower quantization noise and better achievable SNR and SFDR in signal synthesis applications. The actual performance at a given frequency and update rate should be taken from the respective manufacturer datasheets.
What is the digital input interface format for these two DACs?
Both the AD9744ACPZ and AD9742ACP use a parallel CMOS-compatible digital input interface that accepts binary or twos-complement data, clocked by a single input clock. The AD9744 accepts a 14-bit input word, while the AD9742 accepts a 12-bit input word; unused MSBs on the AD9744 must be properly terminated per the datasheet.
Are the AD9744ACPZ and AD9742ACP RoHS compliant and what is their operating temperature range?
Both devices are offered in Pb-free, RoHS-compliant LFCSP packages (the "Z" suffix on AD9744ACPZ denotes the RoHS-compliant version). Both are specified for the industrial temperature range of -40°C to +85°C. Confirm the exact ordering code and compliance status on the manufacturer's product page before design release.