Part A
AD9777BSV
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 875 PCS
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9777BSV are both dual-channel 16-bit high-speed DACs from Analog Devices with matching resolution, channel count, and supply architecture, making the AD9778ABSVZ a viable functional replacement candidate for the AD9777BSV. Designers should validate the higher maximum update rate, tighter INL/DNL linearity, and the different package and temperature grade against their specific application requirements before final qualification.
Resolution and Channel Count
High match
Maximum Update Rate
Validation required
Package Type
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD9778ABSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6245 PCS
- Package
- TQFP-100
- 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 | AD9778ABSVZ | AD9777BSV | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Bit depth determines the quantization accuracy of the DAC output; both are 16-bit, so resolution is equivalent. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation; both parts are dual-channel, preserving functional architecture. |
| Maximum Update Rate | 400 MSPS | 400 MSPS | Update rate sets the maximum output bandwidth; identical rates mean comparable signal generation capability. |
| Supply Voltage | 3.3 V | 3.3 V | Supply voltage must match the board power rail; both operate from a 3.3 V supply, simplifying substitution. |
| Package / Case | 80-TQFP | 80-TQFP | Package footprint and pinout must be compatible for drop-in replacement; both use an 80-lead TQFP. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects external analog interfacing; both provide unbuffered current outputs. |
| Data Interface | Parallel | Parallel | Interface type must match the digital source; both use a parallel input interface. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Temperature range determines suitability for industrial environments; both cover the same industrial range. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9777BSV | AD9778ABSVZ |
|---|---|---|
| Series | TxDAC+® | - |
| Part Status | Obsolete | Active |
| Mounting Type | Surface Mount | - |
| Base Product Number | AD9777 | - |
| Number of Bits | - | 14 |
| 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) | - | ±1.5, ±0.65 |
| Architecture | - | Oversampling Interpolating DAC |
| Operating Temperature | - | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9778ABSVZ and the AD9777BSV?
The AD9778ABSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter and a serial LVDS interface, while the AD9777BSV is a dual 16-bit, 400 MSPS DAC with 2x/4x/8x interpolation and a parallel CMOS input interface. The AD9778ABSVZ offers higher sample rate and lower resolution, whereas the AD9777BSV offers higher resolution at a lower maximum update rate.
Are the AD9778ABSVZ and AD9777BSV pin-compatible?
No. Both devices are supplied in a 100-lead TQFP_EP package, but their pin functions and digital input interfaces differ (serial LVDS on the AD9778ABSVZ versus parallel CMOS on the AD9777BSV). They are not drop-in replacements and require separate PCB layouts.
What is the maximum DAC update rate of each device?
The AD9778ABSVZ supports a maximum DAC update rate of 1 GSPS. The AD9777BSV supports a maximum DAC update rate of 400 MSPS. Designs requiring update rates above 400 MSPS must use the AD9778ABSVZ.
What resolution does each DAC provide?
The AD9778ABSVZ provides 14-bit resolution per DAC channel. The AD9777BSV provides 16-bit resolution per DAC channel. The AD9777BSV therefore offers higher amplitude resolution, while the AD9778ABSVZ trades resolution for higher sample rate.
What digital input interface does each part use?
The AD9778ABSVZ uses a serial LVDS input interface. The AD9777BSV uses a parallel CMOS input interface. This difference affects FPGA/ASIC pin count, board routing, and the digital data source design.
Do both parts include interpolation filters?
Yes. Both the AD9778ABSVZ and the AD9777BSV integrate selectable 2x, 4x, and 8x interpolating filters, allowing the input data rate to be lower than the DAC update rate.
What package do the AD9778ABSVZ and AD9777BSV use?
Both devices are offered in a 100-lead TQFP_EP (exposed pad) package. The package outline is the same family, but pin assignments and interfaces differ, so footprint compatibility must be verified against the respective datasheets.
Can the AD9778ABSVZ directly replace the AD9777BSV in an existing design?
No. Because the two parts differ in resolution (14-bit vs 16-bit), maximum update rate (1 GSPS vs 400 MSPS), and digital input interface (serial LVDS vs parallel CMOS), a direct replacement is not possible. Any substitution requires redesign of the digital interface, clocking, and PCB layout, validated against the manufacturer datasheets.