Part A
AD9747BCPZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2001 Stückzahl
- Package
- LFCSP-72
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9747BCPZRL and AD9746BCPZRL are functionally compatible dual-channel 16-bit DACs sharing the same LFCSP-72 package, pinout, supply architecture, and temperature range, with the AD9747 offering higher maximum update rate and superior dynamic performance. The AD9746BCPZRL can serve as a lower-speed substitute where the full 250 MSPS capability of the AD9747 is not required, but designers must validate dynamic performance margins and confirm that reduced sample-rate headroom is acceptable for the target application.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9746BCPZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5608 Stückzahl
- Package
- VFQFN-72
- Series
- Data Acquisition von 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 | AD9747BCPZRL | AD9746BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 14 bit | Higher resolution provides finer amplitude quantization and lower quantization noise, which directly affects achievable signal-to-noise ratio and spectral purity in the DAC output. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation for complex modulation schemes; matching channel count is essential for functional substitutability. |
| Maximum Update Rate | 250 MSPS | 250 MSPS | The DAC update rate sets the maximum synthesizable signal bandwidth; identical rates mean the same output frequency range is supported. |
| Output Interface | LVDS, parallel | LVDS, parallel | The digital input interface must match the driving FPGA/ASIC to allow a drop-in replacement without redesigning the data bus. |
| Supply Voltage | 1.8 V (digital), 3.3 V (analog) | 1.8 V (digital), 3.3 V (analog) | Matching supply rails ensures the same power architecture and decoupling scheme can be reused on the board. |
| Package | 72-lead LFCSP | 72-lead LFCSP | Identical package and pinout allow physical board compatibility and the same thermal/assembly process. |
| Spurious-Free Dynamic Range (SFDR) | Higher (16-bit grade) | Lower (14-bit grade) | SFDR determines spectral purity and the ability to resolve small signals in the presence of large ones; the 16-bit device typically offers better SFDR, affecting system dynamic performance. |
| Signal-to-Noise Ratio (SNR) | Higher (16-bit grade) | Lower (14-bit grade) | SNR sets the noise floor of the synthesized signal; the higher-resolution part provides better SNR, which matters for wideband communication and instrumentation applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range confirms both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9747BCPZRL | AD9746BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 16 | 14 |
| Number of D/A Converters | 2 | 2 |
| 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 | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±4, ±2 | ±1, ±0.5 |
| Architecture | Quad-Switch | Quad-Switch |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9747BCPZRL and AD9746BCPZRL?
The AD9747BCPZRL is a dual 16-bit, 250 MSPS digital-to-analog converter (DAC), while the AD9746BCPZRL is a dual 14-bit, 250 MSPS DAC. Both are members of the Analog Devices TxDAC+ family, offered in a 72-lead LFCSP (CP-72-2) package and specified for operation over the industrial temperature range. The primary distinction is resolution: 16-bit for the AD9747 versus 14-bit for the AD9746, which affects SNR and SFDR performance.
Are the AD9747BCPZRL and AD9746BCPZRL pin-compatible?
Yes. Both devices are supplied in the same 72-lead LFCSP (CP-72-2) package with an identical pinout, as documented in the Analog Devices AD9747/AD9746 datasheet. This allows a common PCB footprint, though the AD9747 provides higher resolution and correspondingly different dynamic performance specifications.
What is the maximum update rate and resolution of each device?
Both the AD9747BCPZRL and AD9746BCPZRL support a maximum DAC update rate of 250 MSPS. The AD9747BCPZRL provides 16-bit resolution per DAC channel, while the AD9746BCPZRL provides 14-bit resolution per DAC channel. Both are dual-channel current-output DACs.
Do both parts support the same digital input interface?
Yes. Both devices use a parallel LVCMOS-compatible input interface with dual-port or interleaved data input modes, as specified in the shared AD9747/AD9746 datasheet. The AD9747 accepts 16-bit input words per channel, whereas the AD9746 accepts 14-bit input words per channel, so the host FPGA or DSP data width must match the selected device.
How do the dynamic performance specifications compare?
Because the AD9747BCPZRL offers 16-bit resolution versus 14-bit for the AD9746BCPZRL, it generally achieves better signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR) at a given output frequency. Designers should consult the Analog Devices AD9747/AD9746 datasheet for the specific SNR and SFDR values at the intended output frequency and update rate, since performance varies with these conditions.
Are the AD9747BCPZRL and AD9746BCPZRL drop-in replacements for each other?
They share the same package and pinout, but they are not functionally identical drop-in replacements. The AD9747BCPZRL provides 16-bit resolution while the AD9746BCPZRL provides 14-bit resolution, so the digital input data width and the resulting output performance differ. A design migration requires verifying that the host data interface width and system performance requirements are satisfied by the selected device.
What is the significance of the "BCPZRL" suffix on both part numbers?
The "BCPZ" portion denotes the 72-lead LFCSP package with Pb-free (RoHS-compliant) termination, and the "RL" suffix indicates tape-and-reel packaging. Both the AD9747BCPZRL and AD9746BCPZRL are supplied in this same package and packaging format, as listed in Analog Devices ordering information.