Part A
AD9742ACPZ
ADI公司
- Lifecycle
- Active
- Stock
- 1312 件
- Package
- LFCSP-32
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Not a drop-in replacement
The AD9742ACPZ and AD9743BCPZRL are not drop-in replacements for one another. Although both are dual-channel, high-speed digital-to-analog converters from the same manufacturer family, they differ in resolution, output architecture, and package footprint, so a direct board-level substitution is not possible without design changes and validation.
Different resolution
Different output architecture
Different package footprint
Different pin configuration
Parts at a glance
Part B
AD9743BCPZRL
ADI公司
- Lifecycle
- Active
- Stock
- 7690 件
- Package
- VFQFN-72
- 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 | AD9743BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers far finer quantization than a 10-bit DAC, directly affecting signal fidelity and SFDR. |
| Number of DAC Channels | 1 | 2 | Channel count determines whether the device can drive a single or dual signal path; a dual DAC supports I/Q or complex signal generation that a single DAC cannot. |
| Maximum Update Rate | 210 MSPS | 250 MSPS | The update rate sets the maximum synthesizable signal bandwidth; higher sample rates enable wider-band or higher-frequency output signals. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, so external output conditioning (transformer or op-amp I/V stage) is required in either case for voltage-mode interfaces. |
| Supply Voltage | 2.7 V to 3.6 V | 1.8 V to 3.6 V | Supply range affects compatibility with the surrounding digital and analog rails; the wider low-voltage range of the AD9743 allows operation from 1.8 V systems. |
| Package / Mounting | 32-LFCSP (5x5), Surface Mount | 40-LFCSP (6x6), Surface Mount | Package footprint and pin count must match the PCB layout; different package sizes mean the parts are not drop-in replacements without a board redesign. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings mean both parts suit the same environmental conditions and thermal design constraints. |
| Data Interface | Parallel CMOS | Parallel CMOS | Both use a parallel CMOS input bus, so the digital host interface timing and bus width requirements are broadly similar, though bus width differs with resolution. |
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 | AD9742ACPZ | AD9743BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 12 | 10 |
| 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) | ±0.5, ±0.4 | ±0.1, ±0.05 |
| 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 AD9742ACPZ and AD9743BCPZRL?
The AD9742ACPZ is a single-channel 12-bit 210 MSPS TxDAC digital-to-analog converter in a 32-lead LFCSP package, while the AD9743BCPZRL is a dual-channel 10-bit 250 MSPS TxDAC in a 40-lead LFCSP package. The AD9742 offers higher resolution (12-bit vs 10-bit) on a single channel, whereas the AD9743 provides two independent DAC channels with a higher maximum update rate.
Are the AD9742ACPZ and AD9743BCPZRL pin-compatible or footprint-compatible?
No. The AD9742ACPZ uses a 32-lead LFCSP package and the AD9743BCPZRL uses a 40-lead LFCSP package. The different lead counts and package dimensions mean the PCB land patterns are not interchangeable, so a direct drop-in replacement is not possible without a board redesign.
What are the resolution and channel-count specifications of each device?
The AD9742ACPZ is a 12-bit, single-channel DAC. The AD9743BCPZRL is a 10-bit, dual-channel DAC. Designs requiring higher amplitude resolution on one signal path favor the AD9742, while designs needing two synchronized DAC channels favor the AD9743.
How do the maximum update rates of the AD9742ACPZ and AD9743BCPZRL compare?
The AD9742ACPZ supports a maximum update rate of 210 MSPS. The AD9743BCPZRL supports a maximum update rate of 250 MSPS. The AD9743 therefore offers a higher sampling rate per channel, which can be advantageous for wider-bandwidth signal synthesis.
Do both parts use the same digital input interface?
Both devices are members of the Analog Devices TxDAC family and use a parallel CMOS-compatible digital input interface for loading DAC data. However, because the AD9743 is dual-channel, its data input port and control register set differ from the single-channel AD9742, so the digital timing and bus width must be reviewed against each respective datasheet before reuse.
Can the AD9743BCPZRL replace the AD9742ACPZ in an existing design?
Not directly. Beyond the package and pin-count differences, the AD9743 is a 10-bit dual-channel device while the AD9742 is a 12-bit single-channel device. Resolution, channel count, supply and control pin assignments, and PCB footprint all differ, so substitution requires a full schematic and layout review against the AD9743 datasheet.
What are the typical applications for each converter?
The AD9742ACPZ is typically used in single-channel transmit paths such as base-station transmit DACs, instrumentation, and communications systems requiring 12-bit resolution. The AD9743BCPZRL is suited to dual-channel transmit architectures, such as I/Q modulation paths in communications systems, where two matched 10-bit DACs at up to 250 MSPS are required.