Part A
AD9742ACPZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1312 個数
- Package
- LFCSP-32
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD9742ACPZ and AD9745BCPZRL are not drop-in replacements for one another. Although both are single-channel 12-bit high-speed DACs from Analog Devices, they differ in resolution-critical architecture, maximum update rate, output interface type, and package footprint, so a direct substitution is not feasible without redesign and validation.
Different output interface
Different update rate
Different package footprint
Different DAC architecture
Parts at a glance
Part B
AD9745BCPZRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9224 個数
- Package
- VFQFN-72
- Series
- データ取得 - デジタル/アナログコンバータ (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 | AD9745BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Bit depth determines the quantization granularity of the output; both are 12-bit, so reconstruction accuracy class is comparable. |
| Number of DAC Channels | 1 | 2 | Channel count dictates whether a single or dual signal path can be driven; a dual-channel part can replace two singles but not vice versa. |
| Update Rate (Max) | 210 MSPS | 250 MSPS | Maximum sample rate bounds the synthesizable signal bandwidth; the higher-rate device supports wider-band applications. |
| Output Type | Current (unbuffered) | Current (unbuffered) | Output architecture determines the external termination/transformer network required; matching types simplifies drop-in substitution. |
| Full-Scale Output Current | 2 mA to 20 mA | 8.6 mA to 31.7 mA | Full-scale current sets the drive level into the load; differing ranges require re-scaling of the analog front end. |
| Supply Voltage | 3.0 V to 3.6 V | 1.8 V to 3.6 V | Supply range affects compatibility with the surrounding rail plan; the wider-range part offers more flexibility but needs level consideration. |
| Interface Type | Parallel CMOS | Parallel CMOS | Digital interface style determines pin count and FPGA/controller compatibility; identical interfaces ease board-level substitution. |
| Package | 32-lead LFCSP | 40-lead LFCSP | Package footprint and pinout must match for physical drop-in replacement; differing lead counts require a PCB redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial environments; matching ranges mean equivalent thermal qualification. |
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 | AD9745BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| 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 | ±0.25, ±0.13 |
| 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 architectural differences between the AD9742ACPZ and AD9745BCPZRL?
The AD9742ACPZ is a single-channel 12-bit digital-to-analog converter (DAC) with a maximum update rate of 210 MSPS. The AD9745BCPZRL is a dual-channel 12-bit DAC with a maximum update rate of 250 MSPS. The AD9745BCPZRL integrates two DAC cores in a single package, while the AD9742ACPZ contains one DAC core.
Are the AD9742ACPZ and AD9745BCPZRL pin-compatible?
No. The AD9742ACPZ is supplied in a 32-lead LFCSP package, and the AD9745BCPZRL is supplied in a 40-lead LFCSP package. The different package sizes and pin counts mean the two devices are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
What are the maximum update rates of these two DACs?
The AD9742ACPZ supports a maximum update rate of 210 MSPS. The AD9745BCPZRL supports a maximum update rate of 250 MSPS per channel. Both specifications are stated in the respective Analog Devices datasheets.
Do both devices support the same digital input interface?
Both devices accept parallel LVCMOS digital input data at 12-bit resolution. The AD9742ACPZ uses a single 12-bit parallel input port, while the AD9745BCPZRL uses two 12-bit parallel input ports, one per channel. The logic levels and timing requirements should be verified against each device's datasheet for the target clock rate.
How do the power supply requirements compare?
Both devices operate from a single 3.3 V analog and digital supply. The AD9742ACPZ typically consumes approximately 135 mW at 210 MSPS. The AD9745BCPZRL, being a dual-channel device, consumes more power; the datasheet should be consulted for the exact figure at the intended update rate and operating mode.
Can the AD9742ACPZ be used as a drop-in replacement for the AD9745BCPZRL in an existing dual-channel design?
No. The AD9742ACPZ is a single-channel DAC in a 32-lead LFCSP, whereas the AD9745BCPZRL is a dual-channel DAC in a 40-lead LFCSP. A dual-channel design requiring two synchronized outputs cannot be served by a single AD9742ACPZ without adding a second device and reworking the PCB layout, and the package footprints differ.
What are the typical applications for each device?
The AD9742ACPZ is typically used in single-channel transmit paths such as broadband communications, instrumentation, and baseband signal generation. The AD9745BCPZRL is intended for dual-channel or I/Q transmit architectures, including wireless infrastructure transmitters and quadrature modulation systems, where two synchronized DAC outputs are required.