Part A
AD9742ACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1312 PCS
- Package
- LFCSP-32
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Not a drop-in replacement
The AD9742ACPZ and AD9746BCPZ are not drop-in replacements for one another. Although both are dual-channel high-speed DACs from Analog Devices, they differ in resolution, output architecture, and package footprint, so a direct board-level substitution is not possible without redesign.
Different resolution
Different output architecture
Different package footprint
Different supply configuration
Parts at a glance
Part B
AD9746BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4643 PCS
- Package
- LFCSP-72
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9746BCPZ | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Higher resolution provides finer output granularity and lower quantization noise, which directly affects signal fidelity in reconstruction applications. |
| Number of DAC Channels | 1 | 2 | A dual-channel DAC can drive two independent outputs (e.g., I/Q paths) from one package, while a single-channel device requires two parts for the same function. |
| Update Rate (Max) | 210 MSPS | 250 MSPS | Maximum sample rate determines the achievable output bandwidth and suitability for high-frequency synthesis or wideband transmit chains. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture dictates the external termination and amplifier circuitry required to convert the DAC current into a usable voltage signal. |
| Supply Voltage | 2.7 V to 3.6 V | 1.8 V, 3.3 V | Supply requirements affect power-rail design and compatibility with surrounding digital and analog circuitry in the system. |
| Package / Case | 32-WFQFN Exposed Pad, CSP | 48-LFCSP (7x7) | Package footprint and pin count determine PCB layout, thermal handling, and whether a drop-in replacement is physically possible. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Industrial temperature range confirms both parts can operate reliably in the same environmental conditions. |
| Data Interface | Parallel | Parallel | Interface type must match the driving FPGA/ASIC or DSP to ensure compatible timing and bus width. |
| Settling Time | 11 ns | 11 ns | Settling time influences the maximum usable update rate and the dynamic performance of the reconstructed waveform. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9742ACPZ | AD9746BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 12 | 14 |
| 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 | ±1, ±0.5 |
| 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 AD9746BCPZ?
The AD9742ACPZ is a 12-bit, 210 MSPS TxDAC digital-to-analog converter with a parallel CMOS input interface, housed in a 32-lead LFCSP (CP-32-2) package. The AD9746BCPZ is a dual 14-bit, 250 MSPS TxDAC with an LVDS input interface, housed in a 48-lead LFCSP (CP-48-1) package. They differ in resolution, channel count, sample rate, digital interface, and package footprint.
Are the AD9742ACPZ and AD9746BCPZ pin-compatible or footprint-compatible?
No. The AD9742ACPZ uses a 32-lead LFCSP (CP-32-2) package, while the AD9746BCPZ uses a 48-lead LFCSP (CP-48-1) package. The different pin counts, pin functions, and land patterns prevent direct PCB footprint compatibility.
Can the AD9742ACPZ be used as a drop-in replacement for the AD9746BCPZ?
No. Beyond the package and pinout differences, the AD9742ACPZ is a single 12-bit DAC with a parallel CMOS interface, whereas the AD9746BCPZ is a dual 14-bit DAC with an LVDS interface. Resolution, channel count, digital interface, and PCB layout all differ, so a direct drop-in replacement is not possible without redesign.
What are the maximum sample rates of the AD9742ACPZ and AD9746BCPZ?
The AD9742ACPZ supports a maximum update rate of 210 MSPS. The AD9746BCPZ supports a maximum update rate of 250 MSPS.
What digital input interfaces do the AD9742ACPZ and AD9746BCPZ use?
The AD9742ACPZ uses a parallel CMOS input interface for its 12-bit data word. The AD9746BCPZ uses an LVDS (low-voltage differential signaling) input interface for its dual 14-bit data words.
How do the resolutions and channel counts of the AD9742ACPZ and AD9746BCPZ compare?
The AD9742ACPZ is a single-channel 12-bit DAC. The AD9746BCPZ is a dual-channel 14-bit DAC, providing two independent DAC outputs with 14-bit resolution each.
What are the supply voltage requirements for the AD9742ACPZ and AD9746BCPZ?
Both the AD9742ACPZ and AD9746BCPZ operate from a single 3.3 V analog and digital supply (3.0 V to 3.6 V range) with a separate 1.8 V to 3.3 V digital input supply for their respective interfaces, per Analog Devices datasheet specifications.
In what package types are the AD9742ACPZ and AD9746BCPZ available?
The AD9742ACPZ is supplied in a 32-lead LFCSP (CP-32-2) package. The AD9746BCPZ is supplied in a 48-lead LFCSP (CP-48-1) package. Both are RoHS-compliant lead-frame chip-scale packages.