Part A
AD9747BCPZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2001 PCS
- Package
- LFCSP-72
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9747BCPZRL and AD9745BCPZRL are pin-compatible dual-channel DACs from the same Analog Devices TxDAC family, sharing the 72-lead LFCSP package, supply architecture, and digital interface. The AD9747 offers higher resolution and faster update rate, making it a viable functional upgrade for the AD9745 in most applications, provided the system timing and data interface are validated against the higher sample rate.
Resolution
Validation required
Update Rate
Validation required
Package Type
High match
Digital Interface
High match
Parts at a glance
Part B
AD9745BCPZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 9224 PCS
- Package
- VFQFN-72
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9745BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 12 bits | Resolution determines the number of discrete output levels; a 16-bit DAC provides finer amplitude granularity than a 12-bit DAC, affecting signal fidelity and dynamic range. |
| Number of DAC Channels | 2 | 2 | Both are dual-channel DACs, so channel count is identical and does not affect substitutability. |
| Maximum Update Rate | 250 MSPS | 250 MSPS | Update rate defines the maximum sample throughput; identical rates mean both can support the same signal bandwidth requirements. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both being unbuffered current-output DACs means similar analog front-end design is needed. |
| Supply Voltage | 1.8 V, 3.3 V | 1.8 V, 3.3 V | Supply requirements determine power rail compatibility; identical voltages allow the same board power design to be reused. |
| Package / Case | 72-VFQFN Exposed Pad, CSP | 72-VFQFN Exposed Pad, CSP | Package footprint and pinout must match for drop-in substitution; identical packages allow the same PCB layout to be used. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Temperature range defines environmental robustness; identical ranges mean both suit the same application environments. |
| Data Interface | Parallel LVDS | Parallel LVDS | The digital input interface must be compatible with the driving FPGA/ASIC; identical LVDS interfaces ensure interchangeability at the digital side. |
| INL / DNL Linearity | ±4 LSB INL (typical) | ±1 LSB INL (typical) | Linearity specifications affect accuracy and distortion performance; differing INL values mean the two parts are not equivalent in precision-critical applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9747BCPZRL | AD9745BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| 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 | ±0.25, ±0.13 |
| 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 AD9745BCPZRL?
The AD9747BCPZRL is a dual 16-bit, 250 MSPS digital-to-analog converter, while the AD9745BCPZRL is a dual 12-bit, 250 MSPS DAC. Both are members of the Analog Devices AD974x family, are pin-compatible in the same 72-lead LFCSP package, and share the same 250 MSPS maximum update rate, but they differ in resolution (16-bit vs 12-bit) and therefore in dynamic performance specifications such as SNR and SFDR.
Are the AD9747BCPZRL and AD9745BCPZRL 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, because the resolution differs, designers must verify that the 12-bit AD9745BCPZRL meets system performance requirements before using it as a drop-in replacement for the 16-bit AD9747BCPZRL.
What is the maximum update rate of these DACs?
Both the AD9747BCPZRL and AD9745BCPZRL are specified for a maximum update rate of 250 MSPS, allowing them to support high-speed signal synthesis in applications such as wireless infrastructure transmitters and instrumentation.
What is the resolution difference and how does it affect performance?
The AD9747BCPZRL provides 16-bit resolution, whereas the AD9745BCPZRL provides 12-bit resolution. The higher resolution of the AD9747BCPZRL yields lower quantization noise and typically better SNR and SFDR performance, which is important in demanding wideband communication and test applications. The AD9745BCPZRL offers a lower-cost option where 12-bit performance is sufficient.
Do both parts support the same digital input interface?
Yes. Both devices use a parallel LVCMOS-compatible input data interface and include on-chip features such as a serial peripheral interface for configuration, a gain/offset adjustment function, and an internal reference. The digital input timing and control interface are common across the AD974x family, though the data bus width differs (16-bit for the AD9747BCPZRL versus 12-bit for the AD9745BCPZRL).
What are the typical applications for these DACs?
Both the AD9747BCPZRL and AD9745BCPZRL are intended for high-speed, high-dynamic-range applications including wireless base station transmitters, broadband communication systems, instrumentation and test equipment, and radar or defense electronics where dual DAC channels with update rates up to 250 MSPS are required.
What is the difference in power consumption between the two parts?
Both devices operate from the same supply rails (1.8 V digital and 3.3 V analog) and are specified with similar total power dissipation at 250 MSPS. Because the AD9745BCPZRL has a narrower 12-bit data path, its digital input power may be somewhat lower, but designers should consult the respective datasheets for exact power figures under their specific operating conditions.