Part A
AD9747BCPZRL
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2001 ПКС
- Package
- LFCSP-72
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9746BCPZ and AD9747BCPZRL are both dual-channel 16-bit high-speed DACs from the same Analog Devices TxDAC family, sharing the LFCSP-72 package and identical pinout, which makes them strong functional replacement candidates. The AD9747BCPZRL is a tape-and-reel variant of the AD9747 and offers higher guaranteed update rate and superior dynamic performance, while the AD9746BCPZ provides a lower-power option. Designers should validate the specific sample-rate, power, and SFDR requirements of the target application before substituting one for the other.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9746BCPZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4643 ПКС
- Package
- LFCSP-72
- Series
- Сбор данных - цифровые в аналоговые преобразователи (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 | AD9747BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Bit depth determines the quantization accuracy of the DAC output; both are 16-bit, so resolution is not a differentiator. |
| Number of DAC Channels | 2 | 2 | Dual-channel architecture enables I/Q signal generation; both parts are dual DACs, so channel count matches. |
| Maximum Update Rate | 250 MSPS | 250 MSPS | Sample rate sets the maximum synthesizable signal bandwidth; identical rates mean equivalent spectral performance headroom. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output topology ensures the same analog front-end design can be reused. |
| Supply Voltage | 1.8 V to 3.3 V (digital), 3.3 V (analog) | 1.8 V to 3.3 V (digital), 3.3 V (analog) | Supply rails must match the board power tree; identical requirements allow drop-in replacement without regulator changes. |
| Interface | Parallel LVCMOS | Parallel LVCMOS | The digital input interface dictates FPGA/ASIC pin mapping and timing; matching interfaces simplify substitution. |
| Package / Case | 40-VFQFN Exposed Pad, CSP | 40-VFQFN Exposed Pad, CSP | Package footprint and thermal pad must match for PCB layout compatibility; identical packages permit direct board reuse. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range ensures reliable operation across environments; matching ranges confirm equivalent robustness. |
| Packaging / Ordering | Tray | Tape & Reel | Packaging format affects manufacturing handling and pick-and-place line setup; this is the primary practical difference between the two orderable part numbers. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9747BCPZRL | AD9746BCPZ |
|---|---|---|
| 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 AD9746BCPZ and AD9747BCPZRL?
Both are dual-channel 16-bit digital-to-analog converters from Analog Devices in a 72-lead LFCSP package. The AD9746BCPZ is the standard tray packaging option, while the AD9747BCPZRL is the tape-and-reel packaging variant. The AD9747 also offers a higher maximum update rate of 250 MSPS compared to 210 MSPS for the AD9746, and the AD9747 includes an on-chip 2x digital interpolation filter option not available on the AD9746.
Are the AD9746BCPZ and AD9747BCPZRL pin-compatible?
Yes. Both devices are offered in the same 72-lead LFCSP (CP-72-2) package with identical pin assignments, allowing them to share a common PCB footprint. However, designers should verify that the surrounding circuitry supports the higher 250 MSPS update rate and interpolation features of the AD9747 if substituting it for the AD9746.
What is the maximum update rate of each converter?
The AD9746BCPZ supports a maximum update rate of 210 MSPS, while the AD9747BCPZRL supports up to 250 MSPS. Both are 16-bit dual-channel current-output DACs with an on-chip 1.2 V reference.
Do both parts include digital interpolation filters?
No. The AD9747BCPZRL includes a selectable 2x digital interpolation filter, whereas the AD9746BCPZ does not provide an on-chip interpolation filter. This difference affects the digital input data rate requirements and the reconstruction filtering needed in the analog output stage.
What is the difference between the BCPZ and BCPZRL suffixes?
The BCPZ suffix indicates the RoHS-compliant 72-lead LFCSP package in tray form. The BCPZRL suffix indicates the same RoHS-compliant package supplied in tape-and-reel format for automated assembly. Electrical performance is identical between the two packaging options for a given part number.
What are the power supply requirements for these DACs?
Both the AD9746BCPZ and AD9747BCPZRL operate from a 1.8 V analog supply and a 1.8 V digital supply, with a separate 3.3 V supply for the SPI interface. Designers should consult the respective datasheets for detailed current consumption and decoupling requirements.
Can the AD9747BCPZRL be used as a drop-in replacement for the AD9746BCPZ?
Because both share the same 72-lead LFCSP package and pinout, the AD9747BCPZRL can be placed on an AD9746BCPZ footprint. However, it is not a functional drop-in replacement without validation, since the AD9747 supports a higher 250 MSPS update rate and includes a 2x interpolation filter that may require changes to the digital input interface and analog reconstruction filter.
What is the resolution and output type of these converters?
Both the AD9746BCPZ and AD9747BCPZRL are 16-bit dual-channel current-output DACs. Each channel provides a differential current output, and the devices include an on-chip 1.2 V reference to simplify external circuitry.