Part A
AD9777BSVZ
ADI公司
- Lifecycle
- Active
- Stock
- 2987 件
- Package
- TQFP-80
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9777BSVZ and AD9773BSV are both dual-channel 12-bit high-speed DACs from the same Analog Devices TxDAC family, sharing a common 80-lead TQFP footprint and 3.3 V core supply. The AD9777BSVZ offers a higher maximum update rate and wider input data interface, making it a viable functional upgrade candidate for AD9773BSV designs, provided the system clock, data bus width, and interpolation settings are revalidated against the target application.
Resolution and Channel Count
High match
Package and Pinout
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 | AD9777BSVZ | AD9773BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 16 bit | 12 bit | Higher resolution provides finer output quantization and lower quantization noise, which directly affects signal fidelity in synthesis applications. |
| Maximum Update Rate | 160 MSPS | 400 MSPS | The update rate determines the maximum synthesizable output frequency and the achievable oversampling ratio for a given signal bandwidth. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation; matching channel count is essential for quadrature-based transmit architectures. |
| Package / Mounting | 80-TQFP (14x14), Surface Mount | 80-TQFP (14x14), Surface Mount | Package and footprint compatibility determines whether the parts are drop-in replacements on an existing PCB layout. |
| Supply Voltage (Analog/Digital) | 3.1 V to 3.5 V | 3.1 V to 3.5 V | Matching supply rails ensures the replacement can operate within the same power architecture without regulator changes. |
| Interface Type | Parallel CMOS | Parallel CMOS | The digital input interface must match the host FPGA/ASIC driver to avoid level-shifting or protocol changes. |
| On-chip Interpolation | 2x/4x/8x selectable | 2x/4x/8x selectable | Interpolation filters relax the analog reconstruction filter requirements and affect the digital datapath design. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range compatibility ensures the part meets the same environmental requirements in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9777BSVZ | AD9773BSV |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | - |
| Number of D/A Converters | 2 | - |
| Settling Time | 11µs (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 3.1V ~ 3.5V | - |
| Voltage - Supply, Digital | 3.1V ~ 3.5V | - |
| INL / DNL(LSB) | ±6, ±3 | - |
| Architecture | Oversampling Interpolating DAC | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9777BSVZ and the AD9773BSV?
The AD9777BSVZ is a dual-channel, 16-bit, 160 MSPS interpolating DAC with on-chip PLL and digital signal processing, while the AD9773BSV is a dual-channel, 12-bit, 160 MSPS interpolating DAC with similar PLL and interpolation features. The primary difference is resolution: 16-bit for the AD9777BSVZ versus 12-bit for the AD9773BSV. Both are offered in a 80-lead TQFP package and are functionally similar in architecture, but the AD9777BSVZ provides higher amplitude resolution.
Are the AD9777BSVZ and AD9773BSV pin-compatible?
Yes. Both devices are specified in the same 80-lead TQFP (SV) package with the same pinout, allowing the AD9777BSVZ and AD9773BSV to be used in the same PCB footprint. Designers should still verify the specific datasheet pin descriptions and any supply or reference requirements before substituting one for the other.
What is the maximum update rate of the AD9777BSVZ and AD9773BSV?
Both the AD9777BSVZ and AD9773BSV are specified for a maximum DAC update rate of 160 MSPS. The on-chip interpolation filters and PLL allow the input data rate to be lower than the DAC update rate when interpolation is enabled.
Do both parts include an on-chip PLL and interpolation filters?
Yes. Both the AD9777BSVZ and AD9773BSV integrate a programmable PLL clock multiplier and digital interpolation filters (2x, 4x, and 8x selectable), along with digital signal processing features such as a numerically controlled oscillator (NCO) and inverse sinc filters. These features are common to the AD977x family architecture.
What is the resolution difference and how does it affect performance?
The AD9777BSVZ provides 16-bit resolution, while the AD9773BSV provides 12-bit resolution. The higher resolution of the AD9777BSVZ yields lower quantization noise and better spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) performance, which is advantageous in applications requiring wide dynamic range, such as broadband communications and instrumentation.
Can the AD9773BSV be used as a drop-in replacement for the AD9777BSVZ?
Because both devices share the same 80-lead TQFP package and pinout, the AD9773BSV can be placed in the same footprint. However, it is not a functional drop-in replacement in terms of performance: the AD9773BSV offers 12-bit resolution versus 16-bit for the AD9777BSVZ, so system performance specifications such as SNR and SFDR will differ. The substitution should be validated against the target design requirements using the respective datasheets.
What are the typical applications for these dual-channel interpolating DACs?
Both the AD9777BSVZ and AD9773BSV are intended for applications such as broadband wireless communications, cable modem termination systems, digital predistortion, instrumentation, and other systems requiring dual high-speed DACs with interpolation and PLL clock generation. The AD9777BSVZ is preferred where higher resolution and dynamic range are needed, while the AD9773BSV suits cost-sensitive designs where 12-bit resolution is sufficient.