Part A
AD9742ACPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1312 PCS
- Package
- LFCSP-32
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ACPZRL7 and AD9742ACPZ are both 14-bit TxDAC digital-to-analog converters from Analog Devices in the same 32-lead LFCSP package, sharing identical resolution, supply architecture, and pinout family. The AD9744 offers a higher maximum update rate and wider input data rate than the AD9742, so it can serve as a functional upgrade in existing AD9742 sockets provided the system timing margin and power budget are validated. The AD9742 should not be substituted into an AD9744 design where the full 210 MSPS update rate is required.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9744ACPZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2452 PCS
- Package
- LFCSP-32
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9742ACPZ | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides 4x finer quantization than a 12-bit DAC, directly affecting signal fidelity and SFDR in reconstruction applications. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest clock frequency at which the DAC can operate, setting the achievable output bandwidth for high-speed signal synthesis. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is identical and does not affect substitutability in single-channel designs. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V converter or transformer; matching output type ensures the analog front-end design remains compatible. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Operating supply range must match the system rail; identical ranges mean the same power supply design can be reused. |
| Package / Case | 32-WFQFN Exposed Pad, CSP | 32-WFQFN Exposed Pad, CSP | Package and footprint compatibility determines whether the part can be dropped onto an existing PCB without layout changes. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Industrial temperature range confirms suitability for harsh environments and matches the thermal requirements of the target application. |
| INL / DNL | ±1.5 LSB INL (typ) | ±0.5 LSB INL (typ) | Integral and differential nonlinearity affect DC accuracy and monotonicity; the 12-bit device specifies tighter LSB-referenced linearity, though absolute error differs with resolution. |
| SFDR | 84 dBc at 10 MHz output | 80 dBc at 10 MHz output | Spurious-free dynamic range indicates spectral purity; higher SFDR in the 14-bit part benefits communication and instrumentation signal chains. |
| Power Dissipation | 135 mW (typ) | 135 mW (typ) | Power consumption affects thermal budget and supply sizing; identical dissipation means no change to power delivery design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9742ACPZ | AD9744ACPZRL7 |
|---|---|---|
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Active |
| Number of Bits | 12 | 14 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 11ns (Typ) | 11ns (Typ) |
| 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 | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| INL / DNL(LSB) | ±0.5, ±0.4 | ±0.8, ±0.5 |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9744ACPZRL7 and the AD9742ACPZ?
The AD9744ACPZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9742ACPZ is a 12-bit, 210 MSPS TxDAC. Both are members of the same pin-compatible TxDAC family from Analog Devices, but the AD9744 offers 14-bit resolution versus the 12-bit resolution of the AD9742, providing four times the quantization levels for higher dynamic range and lower quantization noise.
Are the AD9744ACPZRL7 and AD9742ACPZ pin-compatible?
Yes. Both devices are offered in the same 32-lead LFCSP (CP-32-2) package and belong to the same TxDAC family, sharing a common pinout. This allows the AD9742ACPZ to be used as a drop-in 12-bit alternative to the AD9744ACPZRL7 on the same PCB footprint, subject to validation of the design's resolution and performance requirements.
Do both parts support the same update rate and clock input?
Yes. Both the AD9744ACPZRL7 and AD9742ACPZ are specified for a maximum update rate of 210 MSPS and accept a differential or single-ended clock input. Their digital input timing and clock interface are consistent across the family, so the same clocking scheme can generally be used for either device.
What is the difference in resolution and how does it affect performance?
The AD9744ACPZRL7 provides 14-bit resolution (16,384 output levels), while the AD9742ACPZ provides 12-bit resolution (4,096 output levels). The higher resolution of the AD9744 yields lower quantization noise and improved spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) in demanding signal synthesis applications, whereas the AD9742 offers a lower-cost option where 12-bit performance is sufficient.
Are the AD9744ACPZRL7 and AD9742ACPZ available in the same package and temperature grade?
Yes. Both devices are supplied in the 32-lead LFCSP package and are specified over the industrial temperature range of -40°C to +85°C. The "ACPZ" suffix in both part numbers denotes the LFCSP package and Pb-free/RoHS-compliant construction, and "RL7" indicates tape-and-reel packaging for the AD9744ACPZRL7.
Can the AD9742ACPZ be used as a lower-cost replacement for the AD9744ACPZRL7?
In many cases yes, because the two parts are pin-compatible and share the same 210 MSPS update rate and interface. However, the AD9742ACPZ provides only 12-bit resolution versus 14 bits for the AD9744ACPZRL7, so the replacement is only appropriate if the system's SNR, SFDR, and quantization-noise requirements are met by 12-bit performance. The substitution should be validated against the design's dynamic performance specifications.
Do both converters use the same digital input format and supply requirements?
Yes. Both the AD9744ACPZRL7 and AD9742ACPZ accept parallel binary-coded digital input words and operate from a single 3.0 V to 3.6 V analog and digital supply, with a separate flexible digital I/O supply. Their reference and control pin functions are consistent within the TxDAC family, simplifying migration between the two resolution grades.