Part A
AD9778BSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2822 PCS
- Package
- TQFP-100
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778BSVZ and AD9777BSVRL are both dual-channel 16-bit high-speed DACs from Analog Devices in the same 100-lead TQFP_EP package, sharing identical supply architecture and digital interface family. The AD9778BSVZ offers a higher maximum update rate and wider output bandwidth, making it a viable functional upgrade candidate for the AD9777BSVRL in most designs, provided the higher-speed timing budget and power dissipation are validated at the board level.
Resolution and Channel Count
High match
Package and Pin Configuration
High match
Maximum Update Rate
Validation required
Supply Voltage and Power Dissipation
Validation required
Parts at a glance
Part B
AD9777BSVRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5427 PCS
- Package
- TQFP-80
- 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 | AD9778BSVZ | AD9777BSVRL | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 16 | 16 | Bit depth determines the quantization noise floor and achievable dynamic range of the synthesized output. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | Higher update rate enables wider signal bandwidths and higher intermediate frequencies in the transmit path. |
| Number of DAC Channels | 2 | 2 | Dual channels support I/Q complex signal generation for quadrature modulation schemes. |
| Input Data Interface | Dual LVDS (DDR) | Dual LVDS (DDR) | The input interface determines the digital source compatibility and required PCB routing topology. |
| On-chip Interpolation | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation filters relax the input data rate and simplify analog reconstruction filtering. |
| Supply Voltage | 3.3 V (analog/digital), 1.8 V (digital core) | 3.3 V (analog/digital), 1.8 V (digital core) | Supply rails must match the board power architecture for direct drop-in compatibility. |
| Package | 100-lead TQFP (SV-100) | 80-lead LQFP (ST-80) | Package footprint and pin count must match for physical board compatibility; differing packages prevent direct substitution. |
| Output Type | Current-steering DAC (differential current output) | Current-steering DAC (differential current output) | Output topology determines the external reconstruction filter and transformer/amplifier design. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range ensures reliable operation across the target application environments. |
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 | AD9778BSVZ | AD9777BSVRL |
|---|---|---|
| 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 ~ 1.9V, 3.13V ~ 3.47V | - |
| INL / DNL(LSB) | ±1, ±0.65 | - |
| Architecture | Oversampling Interpolating DAC | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9778BSVZ and AD9777BSVRL?
The AD9778BSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter, while the AD9777BSVRL is a dual 16-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9778 offers higher sample rate and lower resolution, whereas the AD9777 provides higher resolution at a lower maximum update rate. Both are members of Analog Devices' TxDAC+ family and are packaged in a 100-lead TQFP_EP (SVZ suffix indicates RoHS-compliant TQFP_EP for the AD9778BSVZ; BSVRL indicates tape-and-reel TQFP_EP for the AD9777).
Are the AD9778BSVZ and AD9777BSVRL pin-compatible?
Both devices are offered in the same 100-lead TQFP_EP package (14 mm × 14 mm body), and Analog Devices documents them as pin-compatible within the TxDAC+ family. However, designers must verify the specific pin functions and configuration registers against the respective datasheets before substituting one for the other, because internal register maps and some pin assignments may differ between the 14-bit AD9778 and 16-bit AD9777.
What is the maximum DAC update rate for each device?
The AD9778BSVZ supports a maximum DAC update rate of 1 GSPS (1,000 MSPS). The AD9777BSVRL supports a maximum DAC update rate of 400 MSPS. These figures are specified in the respective Analog Devices datasheets and reflect the input data rate after interpolation.
What resolution does each DAC provide?
The AD9778BSVZ is a dual 14-bit DAC. The AD9777BSVRL is a dual 16-bit DAC. The higher resolution of the AD9777 makes it preferable for applications requiring finer amplitude quantization, while the AD9778's higher speed suits wideband signal synthesis.
What interpolation ratios are supported by these DACs?
Both the AD9778BSVZ and AD9777BSVRL integrate programmable interpolating filters supporting 2x, 4x, and 8x interpolation. This allows the input data rate to be lower than the DAC update rate, simplifying the digital interface and easing analog reconstruction filter requirements.
What is the difference between the BSVZ and BSVRL suffixes?
The "BSVZ" suffix on the AD9778BSVZ denotes a 100-lead TQFP_EP package that is RoHS-compliant (the "Z" indicates lead-free/RoHS compliance per Analog Devices' ordering guide). The "BSVRL" suffix on the AD9777BSVRL denotes the same 100-lead TQFP_EP package supplied in tape-and-reel format ("RL" = reel). Both suffixes refer to package and shipping format, not to electrical grade.
Can the AD9778BSVZ and AD9777BSVRL be used interchangeably in an existing design?
They should not be treated as drop-in replacements without validation. Although both are dual TxDAC+ devices in the same 100-lead TQFP_EP package, they differ in resolution (14-bit vs 16-bit), maximum update rate (1 GSPS vs 400 MSPS), and potentially in register configuration and pin functions. A substitution requires review of the datasheets, SPI register maps, and PCB layout to confirm compatibility with the target design.
What are typical applications for these DACs?
Both devices are intended for high-speed signal synthesis applications such as wireless base station transmitters, broadband communications systems, and direct digital synthesis (DDS) upconversion. The AD9778BSVZ's 1 GSPS update rate suits wideband and higher-frequency synthesis, while the AD9777BSVRL's 16-bit resolution suits applications where dynamic range and quantization noise are more critical than maximum sample rate.