Part A
AD9763ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5685 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9763ASTZ and AD9765ASTRL are dual-channel, 10-bit and 12-bit TxDAC digital-to-analog converters respectively, sharing the same 48-lead LQFP package, pinout, supply architecture, and CMOS-compatible interface. The AD9765ASTRL offers higher resolution and therefore improved dynamic performance, making it a viable functional upgrade in existing AD9763ASTZ sockets, provided the system timing and data bus width are validated for the wider 12-bit input word.
Resolution
High match
Package Type
High match
Supply Voltage
High match
Data Interface Width
Validation required
Parts at a glance
Part B
AD9765ASTRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5759 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - 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 | AD9763ASTZ | AD9765ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Higher resolution provides finer output quantization and lower quantization noise, directly affecting signal fidelity in the DAC output. |
| Number of DAC Channels | 2 (dual) | 2 (dual) | Both are dual-channel DACs, so channel count is compatible for I/Q or dual-path applications. |
| Update Rate (Max) | 125 MSPS | 125 MSPS | Maximum sample rate determines the achievable output bandwidth and suitability for high-speed signal synthesis. |
| Output Type | Current (differential) | Current (differential) | Current-output DACs require an external I/V stage; matching output type ensures the analog front-end design remains compatible. |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | Compatible supply range allows the same power rail design to be reused without modification. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and pinout enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature range ensures equivalent environmental robustness for the target application. |
| Interface | Parallel CMOS | Parallel CMOS | Same digital interface simplifies FPGA/controller connection and timing design reuse. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9763ASTZ | AD9765ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | - |
| Number of D/A Converters | 2 | - |
| Settling Time | 35ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 3V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | - |
| INL / DNL(LSB) | ±0.1, ±0.07 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9763ASTZ and AD9765ASTRL?
The AD9763ASTZ is a dual 10-bit, 125 MSPS TxDAC+ digital-to-analog converter, while the AD9765ASTRL is a dual 12-bit, 125 MSPS TxDAC+ DAC. Both are pin-compatible dual-channel DACs in a 48-lead LQFP package, but the AD9765ASTRL offers 12-bit resolution versus the 10-bit resolution of the AD9763ASTZ, providing four times the quantization levels for higher signal fidelity.
Are the AD9763ASTZ and AD9765ASTRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with the same pinout, allowing the AD9765ASTRL to be used as a higher-resolution drop-in upgrade for the AD9763ASTZ in existing PCB layouts, provided the system timing and interface requirements are met.
What is the maximum update rate of these DACs?
Both the AD9763ASTZ and AD9765ASTRL support a maximum update rate of 125 MSPS, making them suitable for high-speed communications, base station, and instrumentation applications requiring wideband signal synthesis.
What is the resolution difference and how does it affect performance?
The AD9763ASTZ provides 10-bit resolution (1024 levels), while the AD9765ASTRL provides 12-bit resolution (4096 levels). The AD9765ASTRL therefore delivers lower quantization noise and improved spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR), which is beneficial for demanding wideband and multicarrier applications.
Do both parts use the same digital interface?
Yes. Both devices feature a dual-channel, parallel CMOS-compatible input interface with separate data input ports for each DAC channel, and both support interleaved or dual-port data input modes, allowing straightforward migration between the two parts.
What is the difference in the part number suffix "ASTZ" versus "ASTRL"?
The "ASTZ" suffix on AD9763ASTZ denotes the 48-lead LQFP package in a tray or tube shipping format with RoHS-compliant construction. The "ASTRL" suffix on AD9765ASTRL denotes the same 48-lead LQFP package supplied in tape-and-reel format for automated assembly. The suffix difference reflects packaging and shipping format, not device functionality.
Can the AD9765ASTRL directly replace the AD9763ASTZ in an existing design?
Because both parts share the same package, pinout, supply requirements, and interface, the AD9765ASTRL can generally serve as a drop-in replacement for the AD9763ASTZ. However, designers should verify that the higher 12-bit resolution and any associated timing or settling specifications are compatible with the target system before substitution.