Part A
AD9779ABSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2155 PCS
- Package
- TQFP-100
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9779ABSVZ and AD9775BSV are both dual-channel 16-bit high-speed DACs from Analog Devices in the same 100-lead TQFP-EP package, sharing a compatible supply and temperature range, so the AD9779ABSVZ can serve as a functional replacement candidate for the AD9775BSV. However, the two parts differ in maximum update rate, on-chip interpolation/filtering, and digital interface configuration, so the replacement must be validated against the target application's sample-rate, signal-chain, and interface requirements before adoption.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Digital Interface and Interpolation
Validation required
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 | AD9775BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 16 | 14 | Higher resolution provides finer output quantization and lower quantization noise, affecting achievable SNR and signal fidelity. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | Determines the maximum synthesizable output frequency and bandwidth; a faster DAC supports wider signal bandwidths. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q complex signal generation; matching channel count is essential for quadrature architectures. |
| On-chip PLL | No | Yes | An integrated PLL can generate the DAC clock internally, simplifying clocking design and reducing external components. |
| Digital Interface | LVDS | CMOS/LVDS | Interface type affects achievable input data rates, board routing complexity, and compatibility with the driving FPGA/ASIC. |
| Interpolation Factor | 2x/4x/8x | 2x/4x/8x | Interpolation relaxes input data rate requirements and eases analog reconstruction filtering; matching factors preserve system architecture. |
| Supply Voltage | 3.3 V / 1.8 V | 3.3 V | Supply requirements affect power rail design and level compatibility with surrounding circuitry. |
| Package | 100-lead TQFP (SVZ) | 80-lead TQFP (SV) | Package footprint and pinout determine PCB layout compatibility and whether a drop-in substitution is possible. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9779ABSVZ | AD9775BSV |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | TxDAC+® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | - |
| Number of D/A Converters | 2 | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | Internal | - |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | - |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | - |
| INL / DNL(LSB) | ±6, ±2.1 | - |
| Architecture | Oversampling Interpolating DAC | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9779ABSVZ and the AD9775BSV?
The AD9779ABSVZ is a dual-channel, 16-bit, 1 GSPS digital-to-analog converter (DAC) with an integrated 2x/4x/8x interpolating filter, while the AD9775BSV is a dual-channel, 14-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9779A offers higher resolution (16-bit vs 14-bit) and a significantly higher maximum update rate (1 GSPS vs 400 MSPS). Both are members of Analog Devices' TxDAC+ family and are housed in 100-lead TQFP packages, but they differ in speed grade, resolution, and power consumption.
Are the AD9779ABSVZ and AD9775BSV pin-compatible?
Both devices are offered in a 100-lead TQFP (SV) package, and Analog Devices documents them as part of the same TxDAC+ family with a similar pinout. However, direct pin-for-pin compatibility should be confirmed against the respective datasheets, because supply, clock, and interface pin assignments can differ between speed grades and resolution variants. Designers should verify the pin configuration in the official AD9779A and AD9775 datasheets before considering a board-level swap.
What is the maximum DAC update rate for each device?
The AD9779ABSVZ supports a maximum DAC update rate of 1 GSPS (1000 MSPS). The AD9775BSV supports a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9779A makes it suitable for wider-bandwidth signal synthesis and higher intermediate-frequency (IF) applications.
What resolution does each DAC provide?
The AD9779ABSVZ is a 16-bit dual DAC, providing 16-bit resolution per channel. The AD9775BSV is a 14-bit dual DAC, providing 14-bit resolution per channel. The 16-bit resolution of the AD9779A yields lower quantization noise and better spurious-free dynamic range (SFDR) performance for demanding synthesis applications.
Do both parts include interpolation filters?
Yes. Both the AD9779ABSVZ and the AD9775BSV integrate programmable interpolating filters supporting 2x, 4x, and 8x interpolation modes. These filters ease the requirements on the reconstruction filter following the DAC and allow the digital input data rate to be lower than the DAC update rate.
What digital input interface do these DACs use?
Both the AD9779ABSVZ and AD9775BSV use a parallel CMOS-compatible digital input interface for dual-channel data. The AD9779A supports input data rates consistent with its 1 GSPS update capability when interpolation is used, while the AD9775BSV supports input rates consistent with its 400 MSPS update capability. Designers should refer to the respective datasheets for exact timing, setup, and hold specifications.
What are the typical supply voltages and power considerations for these devices?
Both devices operate from a 3.3 V analog supply and a 1.8 V to 3.3 V digital supply, consistent with the TxDAC+ family architecture. Power consumption scales with update rate and interpolation settings; the AD9779A, operating at up to 1 GSPS, generally dissipates more power than the AD9775BSV at 400 MSPS. Exact power figures should be taken from the official Analog Devices datasheets for each part.
Can the AD9775BSV be used as a drop-in replacement for the AD9779ABSVZ?
No. Although both are 100-lead TQFP dual TxDAC+ devices with interpolation filters, they differ in resolution (14-bit vs 16-bit), maximum update rate (400 MSPS vs 1 GSPS), and potentially in pin function details and power requirements. A drop-in replacement is not supported without validating pinout, timing, supply, and performance against the target design and the official datasheets.