Part A
AD9778BSVZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2822 個数
- Package
- TQFP-100
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778BSVZ and AD9777BSV are both dual-channel 16-bit high-speed DACs from Analog Devices in the same 100-lead TQFP-EP package, sharing a common functional architecture and pin family. The AD9778BSVZ offers a higher maximum update rate and wider input data interface, making it a viable functional upgrade candidate for the AD9777BSV 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
Input Data Interface
Validation required
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 | AD9777BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 14 bit | 16 bit | Higher resolution provides finer output quantization and lower quantization noise, which directly affects signal fidelity in synthesis applications. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation; matching channel count is essential for quadrature-based transmit architectures. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | The maximum DAC update rate determines the achievable output bandwidth and the ability to synthesize high-frequency signals. |
| Package / Mounting | 80-TQFP (14x14), Surface Mount | 80-TQFP (14x14), Surface Mount | Package and footprint compatibility affects whether the parts can be dropped into the same PCB layout without redesign. |
| Supply Voltage (Analog/Digital) | 3.3 V | 3.3 V | Matching supply rails ensures the replacement part operates within the same power architecture and level-shifting requirements. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range compatibility is required for reliable operation in harsh or outdoor environments. |
| On-Chip Interpolation / NCO | 2x/4x/8x interpolation with digital up-converter | 2x/4x/8x interpolation with digital up-converter | Integrated interpolation and up-conversion reduce external component count and simplify the transmit signal chain. |
| Input Data Interface | Dual-port LVDS | Dual-port LVDS | Interface compatibility determines whether the existing FPGA or DSP data source can drive the DAC without modification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778BSVZ | AD9777BSV |
|---|---|---|
| Series | - | TxDAC+® |
| Part Status | Active | Obsolete |
| 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 ~ 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 the AD9777BSV?
The AD9778BSVZ is a dual-channel, 14-bit, 1 GSPS digital-to-analog converter, while the AD9777BSV is a dual-channel, 16-bit, 400 MSPS DAC. The AD9778BSVZ offers higher sample rate and lower resolution, whereas the AD9777BSV provides higher resolution at a lower maximum update rate. Both are members of Analog Devices' TxDAC+ family and are supplied in 100-lead TQFP packages.
Are the AD9778BSVZ and AD9777BSV pin-compatible?
Both devices are offered in a 100-lead TQFP (TQFP-100) package with the same body size and lead count, and they share the same TxDAC+ pinout family. However, designers must verify the specific pin functions and configuration against the respective datasheets before considering a board-level swap, because control and interface pin assignments can differ between the two parts.
What is the maximum update rate of each device?
The AD9778BSVZ supports a maximum DAC update rate of 1 GSPS (1000 MSPS). The AD9777BSV supports a maximum DAC update rate of 400 MSPS. The higher throughput of the AD9778BSVZ makes it suitable for wider-bandwidth signal synthesis, while the AD9777BSV targets lower-rate, higher-resolution applications.
What resolution does each DAC provide?
The AD9778BSVZ provides 14-bit resolution on each of its two DAC channels. The AD9777BSV provides 16-bit resolution on each of its two DAC channels. The AD9777BSV therefore offers finer amplitude quantization, while the AD9778BSVZ trades resolution for a higher maximum sample rate.
Do both parts include on-chip digital interpolation filters?
Yes. Both the AD9778BSVZ and the AD9777BSV integrate programmable digital interpolation filters (selectable 2x, 4x, and 8x interpolation) along with digital quadrature modulation and offset/gain correction features, which are characteristic of the Analog Devices TxDAC+ family. These features allow baseband data to be upsampled and upconverted on-chip before the DAC stage.
What is the difference in power supply and I/O interface between the two devices?
Both devices operate from a 3.3 V analog supply and a 1.8 V to 3.3 V digital I/O supply, and both provide a flexible LVDS-compatible input data interface. Because the AD9778BSVZ runs at a higher maximum update rate, its power consumption at full speed is higher than that of the AD9777BSV. Designers should consult the respective datasheets for exact supply current and power dissipation figures under their intended operating conditions.
Can the AD9778BSVZ be used as a drop-in replacement for the AD9777BSV?
No, they should not be treated as drop-in replacements. Although both are 100-lead TQFP dual-channel TxDAC+ devices, they differ in resolution (14-bit vs 16-bit), maximum update rate (1 GSPS vs 400 MSPS), and potentially in pin configuration and power requirements. A substitution requires full validation of pin functions, timing, supply, and system performance against the manufacturer datasheets.
Which device is better suited for high-resolution, lower-speed applications?
The AD9777BSV is better suited for high-resolution, lower-speed applications because it provides 16-bit resolution at up to 400 MSPS. The AD9778BSVZ, with 14-bit resolution at up to 1 GSPS, is better suited for wideband, high-speed signal synthesis where update rate is more critical than amplitude resolution.