Part A
AD9776ABSVZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4577 PCS
- Package
- TQFP-100
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9776ABSVZRL are both dual-channel 16-bit TxDAC+ digital-to-analog converters from the same Analog Devices family, sharing the LQFP-100 package, 1.8 V/3.3 V supply architecture, and serial SPI control interface. The AD9778ABSVZ offers a higher maximum update rate (up to 1 GSPS) versus the AD9776ABSVZRL (up to 750 MSPS), so it can serve as a functional replacement where the higher sample rate is acceptable, but the AD9776ABSVZRL should not be substituted where the full 1 GSPS capability of the AD9778ABSVZ is required. Pinout and register map compatibility make the AD9778ABSVZ a viable candidate, subject to validation of the specific sample-rate and on-chip PLL requirements of the target design.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Supply Voltage and Interface
High match
Parts at a glance
Part B
AD9778ABSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6245 PCS
- Package
- TQFP-100
- Series
- Data Acquisition - 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 | AD9778ABSVZ | AD9776ABSVZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the number of discrete output levels; a 16-bit DAC offers finer amplitude granularity than a 12-bit DAC, affecting signal fidelity and dynamic range. |
| Number of DAC Channels | 2 | 2 | Both are dual-channel DACs, so channel count is compatible for I/Q or dual-path applications. |
| Maximum Update Rate | 1000 MSPS | 1000 MSPS | The maximum sample rate defines the highest signal bandwidth the DAC can synthesize; matching rates support similar high-speed applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both use unbuffered current outputs, simplifying substitution at the analog interface. |
| Supply Voltage | 3.13 V to 3.47 V | 3.13 V to 3.47 V | Compatible supply rails allow the parts to be used in the same power domain without redesigning the power supply. |
| Package / Case | 80-TQFP | 80-TQFP | Identical package and pinout enable drop-in board-level replacement without layout changes. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Matching temperature ranges ensure both parts meet the same environmental requirements for industrial applications. |
| Data Interface | Parallel / LVDS | Parallel / LVDS | The digital input interface must match the driving FPGA/ASIC; identical interfaces allow the same host design to drive either part. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9776ABSVZRL | AD9778ABSVZ |
|---|---|---|
| Supplier | Analog Devices Inc.,Rochester Electronics, LLC | - |
| Part Status | Active | Active |
| Number of Bits | 12 | 14 |
| Number of D/A Converters | 2 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | Internal | Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | 1.7V ~ 2.05V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±0.86, ±0.1 | ±1.5, ±0.65 |
| 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 the AD9776ABSVZRL?
Both are dual-channel, 16-bit digital-to-analog converters from Analog Devices in a 100-lead TQFP-EP package. The primary difference is the maximum update rate: the AD9778A operates at up to 1 GSPS, while the AD9776A operates at up to 500 MSPS. The AD9776ABSVZRL is additionally supplied in tape-and-reel packaging, whereas the AD9778ABSVZ is a standard tray format.
Are the AD9778ABSVZ and AD9776ABSVZRL pin-compatible?
Yes. Both devices are offered in the same 100-lead TQFP-EP (SVZ) package with identical pinout assignments, allowing a common PCB footprint. However, the higher update rate of the AD9778A requires careful review of power delivery, thermal design, and output filtering before substituting it in a design laid out for the AD9776A.
What is the resolution and channel count of these DACs?
Both the AD9778A and AD9776A are dual-channel (two DACs per device) 16-bit current-output digital-to-analog converters with on-chip interpolation filters and a serial control interface.
What is the maximum DAC update rate for each part?
The AD9778ABSVZ supports a maximum update rate of 1 GSPS, while the AD9776ABSVZRL supports a maximum update rate of 500 MSPS. Designs requiring the higher rate must use the AD9778A.
Do these parts include on-chip interpolation filters?
Yes. Both devices integrate programmable interpolation filters (2x, 4x, and 8x) along with a digital quadrature modulator and numerically controlled oscillator, which are intended for direct intermediate-frequency and baseband synthesis in communications systems.
What supply voltages do the AD9778A and AD9776A require?
Both devices operate from a 3.3 V analog supply and a 1.8 V digital supply, with separate supply pins for analog, digital, and clock circuitry to support noise isolation. Designers should confirm exact rail tolerances and sequencing in the respective Analog Devices datasheets.
How does the tape-and-reel option affect the AD9776ABSVZRL versus the AD9778ABSVZ?
The "RL" suffix on the AD9776ABSVZRL denotes tape-and-reel packaging, which is suited to automated high-volume assembly lines. The AD9778ABSVZ is supplied in standard tray packaging. The electrical performance of the devices is unaffected by the packaging format.
Can the AD9776ABSVZRL be used as a drop-in replacement for the AD9778ABSVZ?
Not for full-rate operation. Because the AD9776A is limited to 500 MSPS while the AD9778A supports 1 GSPS, the AD9776ABSVZRL can only replace the AD9778ABSVZ in applications that operate at or below 500 MSPS and after verifying all other specifications against the Analog Devices datasheets.