Part A
AD9778ABSVZ
ADI公司
- Lifecycle
- Active
- Stock
- 6245 件
- Package
- TQFP-100
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9775BSVZRL are both dual-channel 14-bit high-speed DACs from Analog Devices in a 100-lead TQFP-EP package, sharing the same core resolution, channel count, and supply architecture. The AD9778ABSVZ offers a higher maximum update rate and wider operating temperature range, making it a viable functional upgrade candidate for the AD9775BSVZRL in most designs, provided the system timing margin and thermal budget are validated against the higher-speed device.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD9775BSVZRL
ADI公司
- Lifecycle
- Active
- Stock
- 2746 件
- Package
- TQFP-80
- Series
- 資料獲取-數模轉換器（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 | AD9775BSVZRL | Why it matters |
|---|---|---|---|
| Resolution (Bits) | 16 | 14 | Bit depth determines the dynamic range and quantization noise floor of the DAC; a 16-bit device offers 12 dB more SNR potential than a 14-bit device, affecting signal fidelity in synthesis applications. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | The DAC update rate sets the maximum synthesizable output frequency and oversampling capability; a higher rate enables wider bandwidth signal generation and relaxed analog filtering. |
| Number of DAC Channels | 2 | 2 | Dual channels support I/Q complex signal generation; both parts are dual-channel, so channel count is not a differentiator for quadrature applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external transimpedance stage; matching output topology ensures the analog front-end design can be reused. |
| Supply Voltage (Analog/Digital) | 3.1 V to 3.5 V | 3.1 V to 3.5 V | Supply voltage compatibility determines whether the same power rail design and decoupling network can be shared between the two parts. |
| Package / Case | 80-TQFP Exposed Pad | 80-TQFP Exposed Pad | Identical package and footprint allow drop-in board replacement without PCB redesign, which is critical for functional substitutability. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensure both parts meet the same environmental qualification requirements for the target application. |
| Data Interface | Parallel CMOS | Parallel CMOS | A common parallel CMOS input interface means the digital source (FPGA/DSP) and timing can be reused without reworking the data path. |
| On-Chip Interpolation / NCO | 2x/4x/8x interpolation with digital modulation | 2x/4x/8x interpolation with digital modulation | Integrated interpolation and digital upconversion reduce the required input data rate and simplify the digital back-end; matching capability preserves system architecture. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778ABSVZ | AD9775BSVZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 14 | 14 |
| Number of D/A Converters | 2 | 2 |
| Settling Time | - | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| INL / DNL(LSB) | ±1.5, ±0.65 | ±1.5, ±1 |
| Architecture | Oversampling Interpolating DAC | Oversampling Interpolating DAC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9778ABSVZ and AD9775BSVZRL?
The AD9778A is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with a maximum update rate of 1 GSPS, while the AD9775 is a dual 14-bit, 400 MSPS DAC with a maximum update rate of 400 MSPS. Both are members of Analog Devices' TxDAC+ family and are pin-compatible in the same 100-lead TQFP_EP package, but the AD9778A supports higher sample rates and correspondingly higher input data rates through its LVDS interface.
Are the AD9778ABSVZ and AD9775BSVZRL pin-compatible?
Yes. Both devices are offered in the same 100-lead TQFP_EP (thin quad flat pack with exposed pad) package, and Analog Devices documents them as pin-compatible within the TxDAC+ family. However, designers should still verify the specific pin functions and configuration against each device's datasheet before substituting one for the other in an existing layout.
What is the maximum DAC update rate for each device?
The AD9778A supports a maximum DAC update rate of 1 GSPS (1000 MSPS), while the AD9775 supports a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9778A makes it suitable for wider-bandwidth signal synthesis applications.
What is the resolution and channel count of these DACs?
Both the AD9778A and AD9775 are dual-channel (two DACs per package), 14-bit resolution digital-to-analog converters. They are intended for applications such as broadband communications, base stations, and instrumentation where dual high-speed DACs are required.
Do both parts include an on-chip interpolation filter and digital up-converter?
Yes. Both the AD9778A and AD9775 integrate programmable interpolation filters and a digital up-converter (DUC) with a numerically controlled oscillator (NCO) for frequency translation, along with a serial LVDS input interface. These features allow the devices to accept lower-rate input data and upconvert/interpolate it to the higher DAC update rate.
What is the difference in the input data interface between the two parts?
Both devices use a serial LVDS input interface. Because the AD9778A supports a higher maximum DAC update rate (1 GSPS) than the AD9775 (400 MSPS), the AD9778A can accept correspondingly higher input data rates and higher interpolation ratios to feed the faster DAC core. Designers should confirm the exact maximum input data rate and interface timing from the respective datasheets.
What is the difference between the SVZ and BSVZRL ordering suffixes?
The "SVZ" and "BSVZRL" suffixes are Analog Devices ordering codes that indicate package type, temperature grade, and packaging format. Both the AD9778ABSVZ and AD9775BSVZRL are supplied in the 100-lead TQFP_EP package; the "RL" suffix on the AD9775BSVZRL denotes tape-and-reel packaging, while the AD9778ABSVZ is typically supplied in tray form. The "B" grade denotes the industrial temperature range version. Buyers should confirm exact packaging and temperature grade from the manufacturer's ordering guide.
Can the AD9778ABSVZ be used as a drop-in replacement for the AD9775BSVZRL?
Not unconditionally. Although the two devices are pin-compatible and share the same package and 14-bit dual-DAC architecture, the AD9778A is specified for a higher maximum update rate (1 GSPS) than the AD9775 (400 MSPS). A replacement is only valid after verifying that the system clocking, input data rate, interpolation settings, power supply, and thermal design meet the AD9778A's requirements and that the firmware/configuration is compatible. Consult both datasheets and Analog Devices' substitution guidance before replacing.