Part A
AD9778ABSVZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6245 PCS
- Package
- TQFP-100
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9775BSV are both dual-channel 14-bit high-speed DACs from Analog Devices in the same 100-lead TQFP-EP package, sharing a common functional architecture and supply framework. However, they differ in maximum update rate, on-chip digital signal processing features, and specified dynamic performance, so the AD9778ABSVZ can serve as a functional substitute for the AD9775BSV only after the system timing margin, interpolation/filtering requirements, and spectral performance targets have been validated against the application.
Resolution and Channel Count
High match
Maximum Update Rate
Validation required
On-Chip Digital Signal Processing
Validation required
Package and Pin Configuration
High match
Parts at a glance
Part B
AD9775BSV
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4794 PCS
- Package
- TQFP-80
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9775BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 14 | 14 | Bit depth determines the quantization noise floor and achievable dynamic range of the synthesized output. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | The DAC update rate sets the maximum synthesizable signal bandwidth and the placement of images in the output spectrum. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q baseband synthesis for complex modulation schemes. |
| On-chip Interpolation Factor | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation relaxes the input data rate requirement and moves images away from the band of interest. |
| Digital Interface | LVDS | LVDS | The input interface type determines compatibility with the upstream digital signal processor or FPGA. |
| Supply Voltage (Analog/Digital) | 3.3 V / 1.8 V | 3.3 V / 3.3 V | Supply rail requirements affect board-level power design and level-shifting needs. |
| Package | 100-lead TQFP | 80-lead TQFP | Package footprint and pin count determine PCB layout compatibility and whether a drop-in replacement is possible. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range confirms suitability for industrial-grade environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778ABSVZ | AD9775BSV |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | TxDAC+® |
| Part Status | Active | Obsolete |
| 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 AD9775BSV?
The AD9778ABSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter, while the AD9775BSV is a dual 14-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9778A supports a higher maximum update rate (1 GSPS vs. 400 MSPS) and is specified for a different supply and temperature range. Both are members of Analog Devices' TxDAC+ family and are packaged in a 100-lead TQFP_EP, but they are not pin-for-pin drop-in replacements without design validation.
Are the AD9778ABSVZ and AD9775BSV pin-compatible?
Both devices are offered in a 100-lead TQFP_EP (SV) package, but pin compatibility must be verified against the respective datasheets. The AD9778A and AD9775 share a similar TxDAC+ architecture and pinout family, yet differences in supply rails, clock inputs, and control registers mean a direct drop-in substitution should not be assumed. Always confirm pin functions and land patterns against the official Analog Devices datasheets before replacing one with the other.
What is the maximum DAC update rate of each device?
The AD9778ABSVZ is specified for a maximum DAC update rate of 1 GSPS (1000 MSPS). The AD9775BSV is specified for a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9778A makes it suitable for wider-bandwidth signal synthesis and higher intermediate-frequency (IF) applications.
What resolution and channel count do these DACs provide?
Both the AD9778ABSVZ and the AD9775BSV are dual-channel (two DACs per package), 14-bit resolution digital-to-analog converters. They are intended for I/Q transmit architectures in communications systems, where matched dual DACs are required.
What interpolation options are available on these parts?
Both the AD9778ABSVZ and the AD9775BSV integrate programmable interpolating filters supporting 2x, 4x, and 8x interpolation. Interpolation relaxes the analog reconstruction filter requirements by moving the image frequencies higher and reducing the transition band demands on the output filter.
What are the supply voltage requirements for these DACs?
The AD9778ABSVZ and AD9775BSV both 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. Exact supply tolerances, current consumption, and power dissipation figures should be taken from the respective Analog Devices datasheets, as they differ between the 1 GSPS AD9778A and the 400 MSPS AD9775.
Can the AD9775BSV be used as a direct replacement for the AD9778ABSVZ in an existing design?
No, a direct replacement is not recommended without validation. Although both are dual 14-bit interpolating DACs in a 100-lead TQFP_EP package, the AD9775BSV has a lower maximum update rate (400 MSPS vs. 1 GSPS), and register maps, supply requirements, and timing specifications may differ. The design must be re-verified against the AD9775 datasheet, including clocking, output filtering, and PCB layout, before substitution.
What applications are these dual interpolating DACs typically used for?
Both the AD9778ABSVZ and AD9775BSV are intended for communications and signal synthesis applications requiring dual matched DACs, such as I/Q transmit paths in wireless base stations, broadband communications systems, and digital predistortion architectures. The AD9778A's higher 1 GSPS update rate supports wider signal bandwidths and higher IF synthesis, while the AD9775BSV's 400 MSPS rate suits lower-bandwidth transmit chains.