Part A
AD9777BSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2987 Stückzahl
- Package
- TQFP-80
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9777BSVZ and AD9775BSV are both dual-channel 16-bit high-speed DACs from Analog Devices in the same 80-lead TQFP-EP package, sharing core architecture and supply requirements. The AD9777BSVZ offers a higher maximum update rate and wider input data rate, making it a viable functional upgrade candidate for AD9775BSV designs, provided the system timing margin and interpolation configuration are validated against the target application.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Supply Voltage
Validation required
Parts at a glance
Part B
AD9775BSV
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4794 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 | AD9777BSVZ | AD9775BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 16 | 14 | Higher resolution provides finer output quantization and lower quantization noise, affecting achievable signal-to-noise performance. |
| Maximum Update Rate | 160 MSPS | 400 MSPS | The maximum DAC update rate determines the highest output frequency and bandwidth the device can synthesize. |
| Package / Mounting | 80-TQFP (14x14), surface mount | 80-TQFP (14x14), surface mount | Package and footprint compatibility is essential for board-level drop-in substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the target application environment for reliable operation. |
| Supply Voltage (Analog/Digital) | 3.3 V | 3.3 V | Matching supply rails ensures the part can be powered from the same board rails without redesign. |
| Output Type | Current output DAC | Current output DAC | Output architecture must match the downstream analog signal chain for direct substitutability. |
| On-chip Interpolation / Digital Features | Programmable interpolation and digital signal processing | Programmable interpolation and digital signal processing | Digital interpolation and signal processing features affect data rate handling and reconstruction filter requirements. |
| Pin Count | 80 | 80 | Identical pin count supports potential pin-compatible substitution on existing layouts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9777BSVZ | AD9775BSV |
|---|---|---|
| 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 AD9775BSV?
The AD9777BSVZ is a 16-bit, 400 MSPS dual TxDAC+ digital-to-analog converter with a 2x/4x/8x interpolating filter and on-chip PLL, while the AD9775BSV is a 14-bit, 400 MSPS dual TxDAC+ with 2x/4x/8x interpolation. The AD9777 offers higher resolution (16-bit vs 14-bit), and both are specified for 400 MSPS update rates with similar interpolation and PLL features.
Are the AD9777BSVZ and AD9775BSV pin-compatible?
Both devices are offered in a 80-lead LQFP package (SV suffix) with the same pinout family, allowing board-level compatibility in many designs. However, designers must verify the specific pin functions and configuration against the respective datasheets, since resolution and some control register details differ between the 16-bit AD9777 and 14-bit AD9775.
What is the maximum DAC update rate for these parts?
Both the AD9777BSVZ and AD9775BSV are specified for a maximum DAC update rate of 400 MSPS, making them suitable for high-speed transmit applications such as wireless infrastructure and broadband communications.
What interpolation options do the AD9777BSVZ and AD9775BSV provide?
Both devices integrate selectable 2x, 4x, and 8x digital interpolation filters, along with an on-chip numerically controlled oscillator (NCO) and digital mixer for frequency upconversion, plus a clock multiplier/PLL for flexible input clocking.
What is the resolution difference and how does it affect performance?
The AD9777BSVZ provides 16-bit DAC resolution, while the AD9775BSV provides 14-bit resolution. The higher resolution of the AD9777 yields lower quantization noise and improved spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) in demanding transmit signal chains, whereas the 14-bit AD9775 may be sufficient for applications with less stringent dynamic range requirements.
Do both parts support the same digital input interface?
Yes, both the AD9777BSVZ and AD9775BSV accept dual-channel digital input data and support a flexible input data interface with programmable interpolation and a serial control port for configuration. Designers should confirm timing and data format details in each datasheet, as the input word width differs (16-bit vs 14-bit).
What are the typical applications for the AD9777BSVZ and AD9775BSV?
Both DACs target high-speed transmit applications including wireless base stations, broadband communications systems, cable modem termination systems, and instrumentation where dual-channel, high-update-rate digital-to-analog conversion with interpolation and upconversion is required.