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 AD9776ABSVZRL is a viable functional replacement candidate for the AD9777BSVZ, sharing the same 16-bit dual-channel DAC architecture, 80-lead TQFP package, and 3.3 V supply domain. Designers should validate the reduced maximum update rate and narrower temperature range against their specific application requirements before committing to the substitution.
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
AD9776ABSVZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4577 Stückzahl
- Package
- TQFP-100
- 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 | AD9776ABSVZRL | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 16 bit | 12 bit | Resolution determines the quantization noise floor and achievable dynamic range; a 16-bit DAC provides finer amplitude granularity than a 12-bit DAC, so these parts are not functionally interchangeable in high-SFDR designs. |
| Number of DAC Channels | 2 (dual) | 2 (dual) | Both are dual-channel DACs, so the channel count matches; this is a baseline requirement for I/Q transmit architectures. |
| Maximum Update Rate | 160 MSPS | 180 MSPS | The maximum DAC update rate sets the achievable output bandwidth and interpolation headroom; the higher rate of the AD9776A allows wider signal bandwidths. |
| On-Chip Interpolation | 2x/4x/8x selectable | 2x/4x/8x selectable | Interpolation filters relax the analog reconstruction filter requirements and reduce input data rate; matching interpolation options support similar system architectures. |
| Digital Interface | Dual parallel CMOS | Dual parallel CMOS | The input data interface must match the upstream digital source (FPGA/DSP); identical parallel CMOS interfaces simplify board-level substitution. |
| Supply Voltage | 3.3 V (analog and digital) | 3.3 V (analog and digital) | Supply voltage compatibility ensures the part can drop into the same power rail design without level shifting or regulator changes. |
| Package | 80-lead TQFP (SV) | 80-lead TQFP (SV) | Package and pinout compatibility is essential for physical substitutability on an existing PCB footprint. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range compatibility ensures both parts meet the same environmental requirements for the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9777BSVZ | AD9776ABSVZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| 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 ~ 2.05V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±6, ±3 | ±0.86, ±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 the AD9776ABSVZRL?
The AD9777BSVZ is a dual-channel, 16-bit, 400 MSPS interpolating DAC with on-chip PLL and 2x/4x/8x interpolation. The AD9776ABSVZRL is a dual-channel, 12-bit, 1 GSPS DAC with on-chip PLL and 2x/4x/8x interpolation. The primary differences are resolution (16-bit vs 12-bit), maximum update rate (400 MSPS vs 1 GSPS), and the AD9776A's higher-speed LVDS input interface, while both share the 100-lead TQFP-EP (SVZ) package and similar digital datapath architecture.
Are the AD9777BSVZ and AD9776ABSVZRL pin-compatible?
Both devices are offered in the same 100-lead TQFP-EP (SVZ) package, and their pinouts are largely compatible per the respective Analog Devices datasheets. However, designers must verify the input data bus width and interface timing, since the AD9777 uses a 16-bit parallel input while the AD9776A uses a 12-bit input with a high-speed LVDS interface, so direct drop-in substitution requires validation against the target board's routing and timing.
What is the maximum DAC update rate for each device?
The AD9777BSVZ supports a maximum DAC update rate of 400 MSPS. The AD9776ABSVZRL supports a maximum DAC update rate of 1 GSPS. The higher update rate of the AD9776A makes it suitable for wider-bandwidth signal synthesis, while the AD9777 offers higher 16-bit resolution at lower speed.
What resolution does each DAC provide?
The AD9777BSVZ is a 16-bit dual DAC. The AD9776ABSVZRL is a 12-bit dual DAC. The AD9777 therefore provides finer amplitude resolution (16-bit) for applications requiring high dynamic range, whereas the AD9776A trades resolution for a much higher 1 GSPS update rate.
Do both parts include an on-chip PLL and interpolation filters?
Yes. Both the AD9777BSVZ and AD9776ABSVZRL integrate an on-chip PLL clock multiplier and programmable 2x/4x/8x interpolation filters, per Analog Devices datasheets. This allows a lower-rate input clock to drive the higher internal DAC update rate and simplifies external clocking in transmit signal chains.
What input interface does each device use?
The AD9777BSVZ uses a 16-bit parallel CMOS input data interface. The AD9776ABSVZRL uses a high-speed LVDS input data interface to support its 1 GSPS update rate. The interface difference is a key consideration when comparing board-level compatibility and FPGA I/O planning.
What is the difference in the ordering suffix "BSVZ" versus "BSVZRL"?
Both parts use the SVZ package designator (100-lead TQFP-EP, RoHS-compliant). The "RL" suffix on AD9776ABSVZRL denotes tape-and-reel packaging, whereas AD9777BSVZ is supplied in standard tray packaging. The silicon and package are otherwise the same within each respective part number.
Which part should be selected for high-resolution versus high-speed applications?
For applications prioritizing amplitude resolution and dynamic range at moderate bandwidths, the 16-bit AD9777BSVZ at 400 MSPS is appropriate. For applications requiring the highest update rate and wider signal bandwidth, the 12-bit AD9776ABSVZRL at 1 GSPS is appropriate. Selection should be based on verified datasheet parameters for resolution, update rate, interface type, and power, and confirmed against the target design requirements.