Part A
AD9778BSVZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2822 PCS
- Package
- TQFP-100
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778BSVZ and AD9773BSVZRL are both dual-channel 12-bit high-speed DACs from the same Analog Devices TxDAC+ family, sharing a common 100-lead TQFP footprint and 3.3 V core architecture. The AD9778BSVZ offers a higher maximum update rate and wider input data interface, making it a viable functional upgrade candidate for the AD9773BSVZRL in most applications, provided the system clock, data bus width, and power budget are validated against the higher-speed device.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Input Data Interface
Validation required
Parts at a glance
Part B
AD9773BSVZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 85 PCS
- Package
- TQFP-80
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9778BSVZ | AD9773BSVZRL | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 14 bit | 12 bit | Higher resolution provides finer output quantization and lower quantization noise, which directly affects signal fidelity in synthesis applications. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation; matching channel count is essential for quadrature-based transmit architectures. |
| Maximum Update Rate | 400 MSPS | 400 MSPS | The DAC update rate sets the maximum synthesizable signal bandwidth and must meet the system's sampling requirements. |
| Supply Voltage | 3.3 V | 3.3 V | Supply voltage compatibility determines whether the part can drop into an existing power rail design without level shifting. |
| Package / Case | 100-TQFP (14x14) | 80-TQFP (12x12) | Different package footprints and pin counts prevent direct board-level substitution without a PCB redesign. |
| Pin Count | 100 | 80 | Pin count affects layout, routing, and mechanical compatibility; mismatched counts rule out drop-in replacement. |
| Interface Type | Parallel CMOS | Parallel CMOS | The digital input interface must match the host FPGA/ASIC output to ensure correct data transfer and timing. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range ensures reliable operation across the same environmental conditions in both parts. |
| On-Chip Interpolation | 2x/4x/8x | 2x/4x/8x | Interpolation filters relax the input data rate requirements and shape the output spectrum; matching options preserve system architecture. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778BSVZ | AD9773BSVZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 2 | 2 |
| Settling Time | - | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| INL / DNL(LSB) | ±1, ±0.65 | ±0.4, ±0.2 |
| Architecture | Oversampling Interpolating DAC | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9778BSVZ and the AD9773BSVZRL?
Both are dual-channel, 14-bit digital-to-analog converters from Analog Devices in a 100-lead TQFP_EP package. The AD9778BSVZ is specified for a maximum update rate of 210 MSPS, while the AD9773BSVZRL is specified for 160 MSPS. The AD9773BSVZRL is supplied in tape-and-reel packaging (RL suffix), whereas the AD9778BSVZ is supplied in tray packaging. Both integrate an on-chip 2x/4x/8x interpolating filter and a numerically controlled oscillator for digital upconversion.
Are the AD9778BSVZ and AD9773BSVZRL pin-compatible?
Yes. Both devices are offered in the same 100-lead TQFP_EP (SV) package with the same pinout, so they are pin-compatible. However, because the maximum specified update rates differ, the AD9773BSVZRL should not be operated above its 160 MSPS limit even though the board layout accepts either device.
What is the maximum DAC update rate for each device?
The AD9778BSVZ is specified for a maximum update rate of 210 MSPS. The AD9773BSVZRL is specified for a maximum update rate of 160 MSPS. Designs requiring operation above 160 MSPS must use the AD9778BSVZ.
What resolution and channel count do these converters provide?
Both the AD9778BSVZ and AD9773BSVZRL are dual-channel (two DACs) 14-bit converters. Each channel includes a 14-bit DAC core with an integrated interpolating filter and digital upconversion circuitry.
What interpolation and upconversion features are integrated?
Both devices integrate selectable 2x, 4x, or 8x interpolation filters and a numerically controlled oscillator (NCO) for digital upconversion, allowing the DAC output to be placed at an intermediate frequency. These features are common to both the AD9778BSVZ and AD9773BSVZRL.
What supply voltages do the AD9778BSVZ and AD9773BSVZRL require?
Both devices operate from a 3.3 V analog supply and a 1.8 V digital supply, with separate I/O supply options, consistent with the Analog Devices AD977x family datasheet. Designers should confirm exact supply rail tolerances against the current manufacturer datasheet before finalizing the power design.
How does the packaging differ between the AD9778BSVZ and AD9773BSVZRL?
The AD9778BSVZ is supplied in standard tray packaging. The AD9773BSVZRL carries the RL suffix, indicating tape-and-reel packaging intended for automated high-volume assembly. Both use the same 100-lead TQFP_EP body, so the packaging difference affects handling and assembly flow, not the PCB footprint.
Can the AD9773BSVZRL be used as a drop-in replacement for the AD9778BSVZ?
Because the two devices share the same package and pinout, the AD9773BSVZRL can be placed on a board designed for the AD9778BSVZ. However, it is only a valid replacement if the application's DAC update rate does not exceed 160 MSPS, the AD9773BSVZRL's specified maximum. For higher update rates, the AD9778BSVZ must be retained.