Part A
AD9778ABSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6245 Stückzahl
- Package
- TQFP-100
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9773BSV are both dual-channel 12-bit high-speed DACs from Analog Devices with matching resolution, channel count, and 80-lead TQFP-EP packaging, making them strong functional replacement candidates. However, the AD9778ABSVZ supports a higher maximum update rate (1 GSPS versus 400 MSPS) and offers a wider supply voltage range, so the replacement is viable only when the target design does not require the AD9773BSV's specific speed ceiling and supply constraints are validated against the application.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD9773BSV
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7620 Stückzahl
- Package
- TQFP-80
- 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 | AD9778ABSVZ | AD9773BSV | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer output amplitude granularity and lower quantization noise, affecting signal fidelity in synthesis applications. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation; both parts are dual-channel, so channel count is not a differentiator. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | Higher update rate supports wider signal bandwidths and higher intermediate frequencies, critical for high-speed transmit chains. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture determines the external interface circuitry required; both use unbuffered current outputs. |
| Supply Voltage | 3.1 V to 3.5 V | 3.1 V to 3.5 V | Supply range affects power rail design and compatibility with surrounding digital and analog circuitry. |
| Package / Case | 80-TQFP | 80-TQFP | Package footprint and pinout determine board layout compatibility and whether a drop-in replacement is possible. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Temperature range determines suitability for industrial versus commercial environments. |
| Data Interface | Parallel CMOS | Parallel CMOS | Interface type affects the digital host connection and required timing/layout considerations. |
| On-Chip Interpolation | 2x/4x/8x | 2x/4x/8x | Interpolation filters relax input data rate requirements and shape the output spectrum; matching options preserve system compatibility. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778ABSVZ | AD9773BSV |
|---|---|---|
| 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 AD9773BSV?
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 AD9773BSV is a dual 12-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9778ABSVZ offers higher resolution (14-bit vs 12-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 80-lead LQFP packages, but they differ in speed grade, resolution, and power consumption.
Are the AD9778ABSVZ and AD9773BSV pin-compatible?
Both devices are offered in an 80-lead LQFP package, and Analog Devices documents them as pin-compatible within the TxDAC+ family, allowing a common PCB footprint. However, because the AD9778ABSVZ supports a higher sample rate and 14-bit resolution, designers must verify that the surrounding clocking, power supply, and interface circuitry meet the AD9778ABSVZ's requirements before substituting it for the AD9773BSV.
What is the maximum DAC update rate of each device?
The AD9778ABSVZ supports a maximum DAC update rate of 1 GSPS (1000 MSPS). The AD9773BSV supports a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9778ABSVZ enables wider signal bandwidths and higher oversampling ratios in transmit signal chains.
What resolution does each DAC provide?
The AD9778ABSVZ provides 14-bit resolution on each of its two DAC channels. The AD9773BSV provides 12-bit resolution on each of its two DAC channels. The 14-bit resolution of the AD9778ABSVZ yields lower quantization noise and better spurious-free dynamic range (SFDR) performance for demanding wideband applications.
Do both parts include on-chip digital interpolation filters?
Yes. Both the AD9778ABSVZ and the AD9773BSV integrate programmable 2x, 4x, and 8x interpolating filters, along with a digital quadrature modulator and numerically controlled oscillator (NCO) for complex upconversion. This allows both devices to accept lower-rate baseband input data and upconvert it to a higher intermediate frequency before the DAC, reducing the burden on the host processor or FPGA.
What are the typical power supply and power consumption characteristics?
Both devices operate from a 3.3 V analog supply and a 1.8 V digital supply (with 3.3 V-compatible digital I/O). The AD9778ABSVZ, operating at up to 1 GSPS with 14-bit resolution, consumes more power than the AD9773BSV, which runs at up to 400 MSPS with 12-bit resolution. Designers should consult the respective Analog Devices datasheets for exact power figures at specific update rates and operating modes.
Which device should be selected for a wideband transmit application?
For wideband transmit applications requiring high instantaneous bandwidth and high oversampling, the AD9778ABSVZ is the appropriate choice due to its 1 GSPS update rate and 14-bit resolution. The AD9773BSV, with a 400 MSPS update rate and 12-bit resolution, is better suited to lower-bandwidth or lower-cost transmit designs where its performance is sufficient.
Are both parts currently available and supported by Analog Devices?
Both the AD9778ABSVZ and the AD9773BSV are Analog Devices TxDAC+ products. The AD9778ABSVZ is specified as an active production part in the 80-lead LQFP package. The AD9773BSV is an older 12-bit member of the family; availability and lifecycle status should be confirmed against the current Analog Devices product page or authorized distributor listings before committing to a new design.