Part A
AD9779ABSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2155 Stückzahl
- Package
- TQFP-100
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9779ABSVZ and AD9776BSVZ are both dual-channel 16-bit high-speed DACs from the same Analog Devices TxDAC family, sharing the 100-lead TQFP-EP package and 1.8 V to 3.3 V interface supply. The AD9779ABSVZ offers a higher maximum update rate and wider input data rate, making it a viable functional upgrade candidate for the AD9776BSVZ in most designs, provided the system clock, data interface timing, and power budget are validated against the higher-speed device.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Supply Voltage and Power Consumption
Validation required
Parts at a glance
Part B
AD9776BSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8081 Stückzahl
- Package
- TQFP-100
- Series
- Data Acquisition von 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 | AD9779ABSVZ | AD9776BSVZ | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 16 | 12 | Higher resolution provides finer output quantization and lower quantization noise, directly affecting signal fidelity and SFDR performance. |
| Maximum Update Rate | 1000 MSPS | 1000 MSPS | Determines the maximum DAC sample rate and achievable output bandwidth for wideband signal synthesis. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q complex signal generation for quadrature modulation and diversity applications. |
| SFDR at fout (typical) | 84 dBc at 10 MHz output | 78 dBc at 10 MHz output | Spurious-free dynamic range indicates spectral purity; higher SFDR is critical for communication and instrumentation systems. |
| Supply Voltage | 3.3 V (analog), 1.8 V (digital) | 3.3 V (analog), 1.8 V (digital) | Supply requirements affect board-level power design and compatibility with existing power rails. |
| Package | 100-lead TQFP (SVZ) | 100-lead TQFP (SVZ) | Package footprint and pinout determine PCB layout compatibility and drop-in substitutability. |
| Input Interface | Dual-port LVDS input | Dual-port LVDS input | Interface type must match the driving FPGA/ASIC to ensure data rate and signal integrity compatibility. |
| On-chip Interpolation | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation filters relax input data rate requirements and shape the output spectrum for easier reconstruction filtering. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms suitability for industrial and commercial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9779ABSVZ | AD9776BSVZ |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 | Internal | Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±6, ±2.1 | ±0.6, ±0.1 |
| Architecture | Oversampling Interpolating DAC | Oversampling Interpolating DAC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9779ABSVZ and AD9776BSVZ?
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 serial LVDS interface. The AD9776BSVZ is a dual-channel, 12-bit, 1 GSPS DAC with the same 2x/4x/8x interpolation architecture and LVDS interface. The primary difference is resolution: 16-bit (AD9779A) versus 12-bit (AD9776). Both are pin-compatible members of the AD977x family and are supplied in a 100-lead TQFP-EP package.
Are the AD9779ABSVZ and AD9776BSVZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 100-lead TQFP-EP (exposed pad) package with identical pinout assignments, which allows a common PCB footprint. Designers should still verify all pin functions and thermal pad requirements against the respective Analog Devices datasheets before substituting one for the other.
What is the maximum update rate and resolution of each device?
Both the AD9779ABSVZ and AD9776BSVZ support a maximum DAC update rate of 1 GSPS. The AD9779ABSVZ provides 16-bit resolution per DAC channel, while the AD9776BSVZ provides 12-bit resolution per DAC channel. Both integrate dual DAC cores with on-chip interpolation filters selectable at 2x, 4x, or 8x.
Do both parts support the same digital input interface?
Yes. Both devices use a serial LVDS input interface for the digital data path and share the same SPI-compatible serial control port for configuration. The interpolation filter settings, clocking options, and register map are consistent across the AD977x family, so firmware developed for one device is generally portable to the other, subject to resolution-dependent data formatting.
Can the AD9776BSVZ be used as a drop-in replacement for the AD9779ABSVZ?
Not as a direct drop-in replacement in applications requiring 16-bit resolution. Although the devices are pin-compatible and share the same package and interface architecture, the AD9776BSVZ provides only 12-bit resolution, which reduces the achievable signal-to-noise ratio and effective number of bits. A substitution is only appropriate where 12-bit DAC performance meets the system requirements and has been validated against the AD9776BSVZ datasheet.
What are the typical applications for these DACs?
Both the AD9779ABSVZ and AD9776BSVZ are intended for high-speed signal synthesis applications such as wireless base station transmitters, broadband communications systems, radar and instrumentation, and digital predistortion loops. The AD9779ABSVZ is preferred where higher resolution and dynamic range are required, while the AD9776BSVZ suits cost-sensitive designs where 12-bit resolution is sufficient.
What supply voltages and operating conditions do these devices require?
Both devices operate from a 3.3 V analog supply and a 1.8 V digital supply, with a separate 3.3 V supply for the LVDS interface, consistent with the AD977x family datasheets. Designers should consult the official Analog Devices datasheets for the AD9779A and AD9776 for the complete specification of supply tolerances, power consumption, and operating temperature range before finalizing a design.