Part A
AD9746BCPZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4643 PCS
- Package
- LFCSP-72
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9746BCPZ and AD9742ACPZRL7 are not drop-in replacements for one another. Although both are dual-channel high-speed DACs from the same family, they differ in resolution, sample rate, and package, so a direct board-level swap is not possible without design changes and validation.
Different resolution
Different sample rate
Different package
Different pinout
Parts at a glance
Part B
AD9742ACPZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5560 PCS
- Package
- WFQFN-32
- Series
- Data Acquisition - Digital to Analog Converters (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 | AD9746BCPZ | AD9742ACPZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the number of discrete output levels; a 16-bit DAC offers far finer amplitude granularity than a 12-bit DAC, directly affecting signal fidelity and SFDR performance. |
| Number of DAC Channels | 2 | 1 | Dual-channel devices support I/Q or complex signal generation in a single package, while a single-channel device requires two parts for the same function. |
| Maximum Update Rate | 250 MSPS | 210 MSPS | The update rate sets the maximum synthesizable signal bandwidth; a higher rate enables 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) is required in either case for voltage-mode interfaces. |
| Supply Voltage | 3.13 V to 3.47 V | 2.7 V to 3.6 V | The supply range determines compatibility with the system rail; the wider low-voltage range of the AD9742 allows operation at 2.7 V where the AD9746 cannot. |
| Package / Case | 48-LFCSP (7x7) | 32-LFCSP (5x5) | Different package footprints and pin counts mean the two parts are not drop-in compatible and require separate PCB layouts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings mean both are suitable for the same environmental conditions. |
| Data Interface | Parallel CMOS | Parallel CMOS | Both use a parallel CMOS input bus, so the digital host interface style is the same, though bus width differs with resolution. |
| Power Dissipation (typ) | ~300 mW | ~135 mW | Lower power dissipation reduces thermal load and supply current demands, which matters for dense or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9746BCPZ | AD9742ACPZRL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC® |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 2 | 1 |
| Settling Time | - | 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 | 3.13V ~ 3.47V | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | 2.7V ~ 3.6V |
| INL / DNL(LSB) | ±1, ±0.5 | ±0.5, ±0.4 |
| Architecture | Quad-Switch | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9746BCPZ and AD9742ACPZRL7?
The AD9746BCPZ is a dual 14-bit 250 MSPS digital-to-analog converter in a 72-lead LFCSP package, while the AD9742ACPZRL7 is a single 12-bit 210 MSPS DAC in a 32-lead LFCSP package. The AD9746 offers two DAC channels with higher resolution and sample rate, whereas the AD9742 provides one channel with lower resolution and sample rate.
Are the AD9746BCPZ and AD9742ACPZRL7 pin-compatible?
No. The AD9746BCPZ uses a 72-lead LFCSP package and the AD9742ACPZRL7 uses a 32-lead LFCSP package, so they have different pin counts, pin functions, and PCB land patterns and are not directly interchangeable.
What is the resolution and sample rate of each device?
The AD9746BCPZ provides 14-bit resolution with a maximum update rate of 250 MSPS. The AD9742ACPZRL7 provides 12-bit resolution with a maximum update rate of 210 MSPS.
How many DAC channels does each device integrate?
The AD9746BCPZ is a dual-channel DAC, integrating two 14-bit DAC cores. The AD9742ACPZRL7 is a single-channel DAC with one 12-bit DAC core.
What are the supply voltage and power characteristics of these DACs?
Both devices operate from a single 3.3 V analog and digital supply and are specified for operation over the industrial temperature range. The AD9746BCPZ, as a dual 14-bit 250 MSPS converter, dissipates more power than the single-channel 12-bit AD9742ACPZRL7; consult the respective manufacturer datasheets for exact power dissipation figures under specific operating conditions.
What digital input interface do the AD9746BCPZ and AD9742ACPZRL7 use?
Both converters accept parallel LVCMOS-compatible digital input data at their respective resolutions and update rates, with the AD9746BCPZ receiving two 14-bit input words and the AD9742ACPZRL7 receiving a single 12-bit input word. Data is latched on the rising edge of the supplied clock.
Can the AD9742ACPZRL7 be used as a drop-in replacement for the AD9746BCPZ?
No. The devices differ in channel count, resolution, sample rate, and package footprint, so the AD9742ACPZRL7 cannot directly replace the AD9746BCPZ. Any substitution requires redesign of the PCB, clocking, data interface, and analog output network, followed by full validation against the target application requirements.