Part A
AD9779ABSVZ
ADI公司
- Lifecycle
- Active
- Stock
- 2155 件
- Package
- TQFP-100
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9779ABSVZ and AD9773BSVZRL are both dual-channel 12-bit high-speed DACs from Analog Devices in the same 100-lead TQFP_EP package, sharing a common functional architecture and pin family. However, they differ in maximum update rate, on-chip interpolation/filtering capability, and supply configuration, so the AD9773BSVZRL can serve as a functional substitute for the AD9779ABSVZ only after validating clock rate, digital interface timing, and power-rail requirements against the target design.
Resolution and Channel Count
High match
Maximum Update Rate
Validation required
On-Chip Interpolation and Filtering
Validation required
Package Type
High match
Parts at a glance
Part B
AD9773BSVZRL
ADI公司
- Lifecycle
- Active
- Stock
- 85 件
- Package
- TQFP-80
- 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 | AD9779ABSVZ | AD9773BSVZRL | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 16 bit | 12 bit | Higher resolution provides finer output amplitude granularity and lower quantization noise, directly affecting signal fidelity and dynamic range. |
| Number of DAC Channels | 2 (dual) | 2 (dual) | Both are dual-channel DACs, so channel count is compatible for I/Q transmit architectures. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | The maximum DAC update rate determines the achievable output bandwidth and oversampling ratio for a given signal band. |
| Maximum Input Data Rate | 500 MSPS | 160 MSPS | Input data rate limits the digital interface throughput and constrains the maximum synthesizable signal bandwidth. |
| Digital Interface | Dual LVDS | Dual CMOS | The interface type affects FPGA/ASIC pin count, board routing complexity, and achievable data throughput. |
| On-chip Interpolation | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation filters relax the analog reconstruction filter requirements and reduce input data rate demands. |
| On-chip Digital Modulation | Yes (fine complex modulation) | Yes (fine complex modulation) | Digital upconversion/modulation enables direct IF/RF synthesis and simplifies the external analog upconversion chain. |
| Supply Voltage | 3.3 V (analog/digital), 1.8 V (digital core) | 3.3 V (analog/digital), 1.8 V (digital core) | Supply voltage compatibility determines whether the part can drop into an existing power rail design without changes. |
| Package | 100-lead TQFP (SVZ) | 80-lead TQFP (SVZ) | Package footprint and pin count must match for board-level substitutability; different packages require layout changes. |
| Power Consumption (typical) | Approx. 1.0 W at 1000 MSPS | Approx. 0.5 W at 400 MSPS | Power dissipation affects thermal design, supply sizing, and overall system efficiency. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9779ABSVZ | AD9773BSVZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| Number of D/A Converters | 2 | 2 |
| Settling Time | - | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| INL / DNL(LSB) | ±6, ±2.1 | ±0.4, ±0.2 |
| Architecture | Oversampling Interpolating DAC | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9779ABSVZ and the AD9773BSVZRL?
The AD9779ABSVZ is a dual-channel, 16-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter and a maximum input data rate of 500 MSPS per channel. The AD9773BSVZRL is a dual-channel, 12-bit, 400 MSPS DAC with 2x/4x/8x interpolation and a maximum input data rate of 200 MSPS per channel. The AD9779A offers higher resolution (16-bit vs 12-bit) and higher speed (1 GSPS vs 400 MSPS), while both share the same 100-lead TQFP-EP package and 1.8 V/3.3 V supply architecture.
Are the AD9779ABSVZ and AD9773BSVZRL pin-compatible?
Both devices are offered in the same 100-lead TQFP-EP (thin quad flat pack with exposed pad) package, and Analog Devices documents them as pin-compatible within the TxDAC family. However, designers must verify the specific pin functions and configuration registers against the respective datasheets before substituting one for the other in an existing layout.
What is the maximum DAC update rate for each device?
The AD9779ABSVZ supports a maximum DAC update rate of 1 GSPS. The AD9773BSVZRL supports a maximum DAC update rate of 400 MSPS. The maximum input data rate is 500 MSPS per channel for the AD9779A and 200 MSPS per channel for the AD9773.
What resolution does each DAC provide?
The AD9779ABSVZ is a 16-bit dual DAC. The AD9773BSVZRL is a 12-bit dual DAC. The higher resolution of the AD9779A provides lower quantization noise and better spurious-free dynamic range (SFDR) for wideband signal synthesis.
Do both parts include on-chip interpolation filters?
Yes. Both the AD9779ABSVZ and the AD9773BSVZRL integrate selectable 2x, 4x, and 8x digital interpolation filters with programmable FIR filter coefficients, allowing the input data rate to be lower than the DAC update rate while maintaining spectral performance.
What are the supply voltage requirements for these DACs?
Both devices operate from a 1.8 V digital supply and a 3.3 V analog supply, with separate digital I/O supply (DVDD) options. Designers should consult the respective datasheets for the exact recommended operating ranges and decoupling requirements.
Can the AD9773BSVZRL be used as a drop-in replacement for the AD9779ABSVZ?
No. Although both are 100-lead TQFP-EP devices in the same family, the AD9773BSVZRL is a 12-bit, 400 MSPS DAC while the AD9779ABSVZ is a 16-bit, 1 GSPS DAC. The resolution, speed grade, and register map differ, so a direct drop-in replacement is not valid without design and firmware changes validated against the AD9773 datasheet.
What is the difference in the ordering suffix "BSVZ" and "BSVZRL"?
The "BSVZ" suffix indicates a RoHS-compliant 100-lead TQFP-EP package in a tray. The "RL" suffix on the AD9773BSVZRL indicates tape-and-reel packaging for automated assembly. Both suffixes refer to the same base device and package type; only the shipping format differs.