Part A
AD9777BSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2987 PCS
- Package
- TQFP-80
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9777BSVZ and AD9776BSVZ are functionally compatible dual-channel 16-bit DACs sharing the same package, pinout, and supply architecture, with the AD9777BSVZ offering higher maximum update rate and wider input data rate. The AD9776BSVZ can serve as a drop-in functional substitute where the lower 400 MSPS update rate and reduced input data rate are acceptable, while the AD9777BSVZ remains the preferred choice for higher-speed applications.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Supply Voltage Architecture
High match
Parts at a glance
Part B
AD9776BSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8081 PCS
- Package
- TQFP-100
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9776BSVZ | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 16 | 12 | Higher resolution provides finer output quantization and lower quantization noise, which directly affects signal fidelity and SFDR in synthesis applications. |
| Maximum Update Rate | 160 MSPS | 180 MSPS | The maximum DAC update rate determines the highest synthesizable output frequency and the achievable oversampling ratio for a given signal bandwidth. |
| SFDR at fOUT = 10 MHz | 84 dBc | 78 dBc | Spurious-free dynamic range indicates the purity of the synthesized tone; higher SFDR means fewer in-band spurs, which is critical for communications and instrumentation. |
| Input Data Interface Width | 16-bit | 12-bit | The input bus width must match the digital source; a mismatch requires data reformatting or truncation and affects the achievable dynamic range of the signal chain. |
| Power Dissipation (typical) | 1.35 W | 1.20 W | Power dissipation affects thermal design, supply sizing, and whether the part can be dropped into an existing board without thermal rework. |
| Package | 80-lead TQFP (SVZ) | 80-lead TQFP (SVZ) | Identical package and pinout enable direct PCB footprint compatibility, which is essential for drop-in substitution. |
| Supply Voltage | 3.3 V analog / 3.3 V digital | 3.3 V analog / 3.3 V digital | Matching supply rails means the same power tree and decoupling network can be reused without redesign. |
| On-chip Interpolation / NCO | 2x/4x/8x interpolation with digital NCO | 2x/4x/8x interpolation with digital NCO | Identical digital signal processing features preserve the same system architecture and firmware configuration for frequency upconversion. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The same industrial temperature range ensures both parts meet the same environmental qualification requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9777BSVZ | AD9776BSVZ |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Number of D/A Converters | 2 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | Internal |
| Voltage - Supply, Analog | 3.1V ~ 3.5V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 3.1V ~ 3.5V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±6, ±3 | ±0.6, ±0.1 |
| Architecture | Oversampling Interpolating DAC | Oversampling Interpolating DAC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | TxDAC+® | - |
| Settling Time | 11µs (Typ) | - |
Frequently asked questions
What are the key differences between the AD9777BSVZ and AD9776BSVZ?
The AD9777BSVZ is a dual-channel, 16-bit, 400 MSPS interpolating DAC with on-chip PLL and 2x/4x/8x interpolation, while the AD9776BSVZ is a dual-channel, 12-bit, 400 MSPS interpolating DAC with the same 2x/4x/8x interpolation architecture. The primary difference is resolution: 16-bit for the AD9777 versus 12-bit for the AD9776. Both are offered in a 100-lead TQFP_EP (SVZ) package and share the same pinout and functional block structure per Analog Devices documentation.
Are the AD9777BSVZ and AD9776BSVZ pin-compatible?
Yes. Both devices are specified in the same 100-lead TQFP_EP (SVZ) package and share a common pinout per Analog Devices datasheets, which allows board-level interchangeability. However, resolution-dependent performance differences (16-bit vs 12-bit) must be validated for the target design before substitution.
What is the maximum update rate and resolution of each device?
Both the AD9777BSVZ and AD9776BSVZ support a maximum DAC update rate of 400 MSPS. The AD9777BSVZ provides 16-bit resolution per DAC channel, while the AD9776BSVZ provides 12-bit resolution per DAC channel, per Analog Devices datasheet specifications.
Do both parts include on-chip interpolation and a PLL?
Yes. Both the AD9777BSVZ and AD9776BSVZ integrate selectable 2x/4x/8x digital interpolation filters and an on-chip clock multiplier PLL, allowing a lower-speed input clock to generate the higher internal DAC update rate. This is documented in the respective Analog Devices datasheets.
What digital input interface do these DACs use?
Both devices use a dual-channel input interface with input data rates up to 200 MSPS per channel when interpolation is enabled, feeding the internal interpolation filters and DAC cores. The exact input data format and timing are specified in the Analog Devices datasheets for the AD9777 and AD9776.
Can the AD9776BSVZ be used as a drop-in replacement for the AD9777BSVZ?
Because both share the same 100-lead TQFP_EP package and pinout, the AD9776BSVZ can be placed on a board designed for the AD9777BSVZ. However, it is not a functional drop-in replacement where 16-bit resolution is required, since the AD9776BSVZ provides only 12-bit resolution. The design's SNR and resolution requirements must be revalidated against the AD9776BSVZ datasheet before substitution.
What are the typical applications for these dual DACs?
Per Analog Devices documentation, the AD9777BSVZ and AD9776BSVZ are intended for wideband communications systems, including base station transmit paths, cable modem termination systems, and other applications requiring dual high-speed interpolating DACs with on-chip PLL clock generation.