Part A
AD9747BCPZRL
ADI公司
- Lifecycle
- Active
- Stock
- 2001 件
- Package
- LFCSP-72
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9747BCPZRL and AD9741BCPZ are both dual-channel 16-bit high-speed DACs from Analog Devices in the same 40-lead LFCSP package, sharing a common interface and supply architecture. However, the AD9747BCPZRL offers a significantly higher maximum update rate and wider bandwidth than the AD9741BCPZ, so the AD9741BCPZ can serve as a lower-speed functional substitute only when the system's sampling requirements fall within its specified limits. Designers should validate dynamic performance, clocking, and output configuration against the target application before committing to a replacement.
Resolution and Channel Count
High match
Maximum Update Rate
Validation required
Package Type
High match
Output Interface and Supply
Validation required
Parts at a glance
Part B
AD9741BCPZ
ADI公司
- Lifecycle
- Active
- Stock
- 8711 件
- Package
- VFQFN-72
- Series
- 資料獲取-數模轉換器（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 | AD9741BCPZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Higher resolution provides finer output granularity and lower quantization noise, which directly affects signal fidelity in the DAC output. |
| Number of DAC Channels | 2 | 2 | Both are dual-channel DACs, so channel count is compatible for dual-path transmit architectures. |
| Maximum Update Rate | 250 MSPS | 250 MSPS | Update rate determines the maximum synthesizable signal bandwidth and must match the application's sampling requirements. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output type ensures the analog front-end design remains compatible. |
| Supply Voltage | 1.8 V, 3.3 V | 1.8 V, 3.3 V | Supply rail compatibility ensures the part can drop into the same power architecture without redesign. |
| Package / Case | 72-VFQFN Exposed Pad, CSP | 72-VFQFN Exposed Pad, CSP | Identical package and footprint allow direct PCB substitution without layout changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Matching temperature grades confirm both parts are suitable for the same industrial operating environments. |
| Data Interface | Parallel LVDS/CMOS | Parallel LVDS/CMOS | Interface compatibility determines whether the existing digital controller can drive the DAC without protocol changes. |
| INL / DNL Linearity | ±4 LSB INL (typical) | ±0.5 LSB INL (typical) | Linearity specifications affect distortion performance; differing INL values mean spectral performance will not be identical between the two parts. |
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 | AD9747BCPZRL | AD9741BCPZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 8 |
| 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 | ±0.05, ±0.03 |
| 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 the AD9741BCPZ?
The AD9747BCPZRL is a dual 16-bit, 250 MSPS digital-to-analog converter, while the AD9741BCPZ is a dual 12-bit, 250 MSPS DAC. Both are members of Analog Devices' TxDAC+ family and share the same 72-lead LFCSP package and 250 MSPS maximum update rate, but the AD9747 offers 16-bit resolution versus 12-bit resolution on the AD9741, giving the AD9747 lower quantization noise and higher spurious-free dynamic range for demanding wideband applications.
Are the AD9747BCPZRL and AD9741BCPZ pin-compatible?
Yes. Both devices are offered in the same 72-lead LFCSP (CP-72) package with an identical pinout, which allows a common PCB footprint. However, pin compatibility does not guarantee functional equivalence; the resolution, data interface width, and some performance specifications differ, so firmware and digital input formatting must be validated before substituting one for the other.
What is the maximum sample rate and resolution of each device?
Both the AD9747BCPZRL and the AD9741BCPZ support a maximum update rate of 250 MSPS. The AD9747 provides 16-bit resolution per DAC channel, while the AD9741 provides 12-bit resolution per DAC channel. Both are dual-channel (two DACs per package) current-output converters.
Do both parts use the same digital input interface?
Both devices use a parallel LVDS-compatible input interface, but the bus width differs because of the resolution difference. The AD9747 accepts 16-bit data words per channel, whereas the AD9741 accepts 12-bit data words per channel. The digital source (FPGA or DSP) must be configured for the correct bus width and data format for the selected part.
What is the difference in dynamic performance between the AD9747BCPZRL and AD9741BCPZ?
The higher 16-bit resolution of the AD9747BCPZRL yields lower quantization noise and typically better spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) than the 12-bit AD9741BCPZ at a given output frequency. Designers should consult the respective Analog Devices datasheets for the exact SFDR and SNR specifications at the specific output frequency and update rate of their application, since these figures are frequency-dependent.
Are the AD9747BCPZRL and AD9741BCPZ drop-in replacements for each other in an existing design?
They are not true drop-in replacements. Although they share the same package and pinout, the difference in resolution (16-bit vs. 12-bit) means the digital input data width and the resulting output transfer function differ. A design built for the AD9741 driving 12-bit data cannot simply accept the AD9747 without reconfiguring the digital interface and revalidating performance. The reverse substitution would also require firmware changes and performance verification.
What is the difference between the AD9747BCPZRL and AD9747BCPZ ordering suffix?
The "RL" suffix on AD9747BCPZRL denotes tape-and-reel packaging, whereas AD9747BCPZ is supplied in trays. The silicon device, package, and specifications are identical; only the shipping/packaging format differs. This is relevant for automated pick-and-place assembly lines that require reeled components.
Which device should be selected for a wideband transmitter application?
For wideband transmit applications requiring high dynamic range and low quantization noise, the AD9747BCPZRL (16-bit) is generally preferred over the AD9741BCPZ (12-bit) because its finer resolution supports better SFDR and SNR performance. The AD9741BCPZ may be adequate where 12-bit resolution meets the system error-vector-magnitude and spectral mask requirements, offering a lower-cost option within the same footprint.