Part A
AD9778ABSVZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6245 ПКС
- Package
- TQFP-100
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9773BSVZRL are both dual-channel 12-bit high-speed DACs from Analog Devices in a 100-lead TQFP_EP package, sharing the same core resolution, channel count, and supply architecture. The AD9778ABSVZ offers a higher maximum update rate (up to 1 GSPS) versus the AD9773BSVZRL (up to 400 MSPS), so it can serve as a higher-performance substitute where board layout and digital interface timing are validated. Designers should confirm the specific interpolation filter settings, on-chip PLL configuration, and output compliance range against the target application before committing to a drop-in replacement.
Resolution and Channel Count
High match
Package Type
High match
Maximum Update Rate
Validation required
Digital Interface and PLL Configuration
Validation required
Parts at a glance
Part B
AD9773BSVZRL
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 85 ПКС
- Package
- TQFP-80
- Series
- Сбор данных - цифровые в аналоговые преобразователи (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 | AD9773BSVZRL | Why it matters |
|---|---|---|---|
| Resolution (Bits) | 14 | 12 | Resolution determines the quantization accuracy and achievable SNR of the DAC; a 14-bit part offers finer output steps than a 12-bit part, affecting signal fidelity. |
| 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 | 400 MSPS | The maximum sample rate limits the bandwidth of signals that can be synthesized; the higher-rate part supports wider-band applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both use current-steering outputs requiring similar termination. |
| Supply Voltage | 3.1 V to 3.5 V | 3.1 V to 3.5 V | Matching supply requirements means the same power rail design can be reused without modification. |
| Package / Case | 100-TQFP (14x14) | 80-TQFP (12x12) | Different package footprints require different PCB land patterns, so a drop-in replacement is not possible without layout changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Identical temperature ratings ensure both parts suit the same industrial-grade environmental conditions. |
| Data Interface | Parallel CMOS | Parallel CMOS | A matching digital interface simplifies the FPGA/controller connection and allows reuse of existing timing and bus designs. |
| On-Chip Interpolation | 2x / 4x / 8x | 2x / 4x / 8x | Interpolation filters relax the analog reconstruction filter requirements; identical options mean comparable spectral performance and filter design. |
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 | AD9778ABSVZ | 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 ~ 2.05V, 3.13V ~ 3.47V | 3.1V ~ 3.5V |
| INL / DNL(LSB) | ±1.5, ±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 AD9778ABSVZ and the AD9773BSVZRL?
The AD9778ABSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter, while the AD9773BSVZRL is a dual 12-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9778A offers higher resolution (14-bit vs 12-bit) and a significantly higher maximum update rate (1 GSPS vs 400 MSPS). Both are members of the Analog Devices TxDAC+ family and are housed in a 100-lead TQFP_EP package.
Are the AD9778ABSVZ and AD9773BSVZRL pin-compatible?
Yes. Both devices are specified in the same 100-lead TQFP_EP (SV-100-2) package with an identical pinout, which allows the AD9773BSVZRL to be used as a lower-resolution, lower-speed drop-in option on a board designed for the AD9778ABSVZ, provided the system timing and resolution requirements are revalidated.
What is the maximum DAC update rate for each device?
The AD9778ABSVZ supports a maximum DAC update rate of 1 GSPS (1,000 MSPS). The AD9773BSVZRL supports a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9778ABSVZ enables wider signal bandwidths and higher oversampling ratios in the digital-to-analog signal chain.
What resolution does each DAC provide?
The AD9778ABSVZ provides 14-bit resolution per DAC channel (dual DAC). The AD9773BSVZRL provides 12-bit resolution per DAC channel (dual DAC). The 14-bit device offers 4x finer quantization, resulting in lower quantization noise and better spurious-free dynamic range (SFDR) for demanding wideband applications.
Do both parts include the same on-chip interpolation filters?
Yes. Both the AD9778ABSVZ and AD9773BSVZRL integrate selectable 2x, 4x, and 8x digital interpolation filters, along with a digital quadrature modulator and numerically controlled oscillator (NCO) for complex upconversion. This allows both parts to accept lower input data rates and shift the image frequencies away from the band of interest.
What is the difference in power consumption between the two devices?
The AD9778ABSVZ, operating at up to 1 GSPS with 14-bit resolution, typically consumes more power than the AD9773BSVZRL, which runs at up to 400 MSPS with 12-bit resolution. Exact power figures depend on update rate, interpolation mode, and supply configuration, and should be taken from the respective Analog Devices datasheets rather than assumed.
Can the AD9773BSVZRL be used as a direct replacement for the AD9778ABSVZ in an existing design?
Because both share the same 100-lead TQFP_EP package and pinout, the AD9773BSVZRL can physically replace the AD9778ABSVZ. However, it is not a functional equivalent: the replacement reduces resolution from 14-bit to 12-bit and lowers the maximum update rate from 1 GSPS to 400 MSPS. The design's clocking, data interface timing, filter configuration, and dynamic performance budgets must be revalidated before substitution.
What is the significance of the "RL" suffix on the AD9773BSVZRL part number?
The "RL" suffix denotes tape-and-reel packaging for the AD9773BSVZRL, which is intended for automated high-volume assembly. The AD9778ABSVZ is specified as a tray-packaged device. Both are RoHS-compliant and are supplied in the same 100-lead TQFP_EP package; the suffix affects packaging and order quantity, not the silicon.