Part A
AD9778ABSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6245 PCS
- Package
- TQFP-100
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9778ABSVZ and AD9776BSVZ are both dual-channel 16-bit high-speed DACs from the same Analog Devices TxDAC+ family, sharing the 100-lead TQFP-EP package and identical pinout, supply architecture, and digital interface. The AD9778ABSVZ offers a higher maximum update rate (up to 1 GSPS versus 750 MSPS for the AD9776BSVZ), making it a functionally compatible and performance-upgraded replacement candidate, provided the system timing margin and thermal budget are validated for the higher sample rate.
Resolution and Channel Count
High match
Package and Pinout
High match
Digital Interface
High match
Maximum Update Rate
Validation required
Parts at a glance
Part B
AD9776BSVZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8081 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 | AD9776BSVZ | 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 identical and does not affect substitutability. |
| Maximum Update Rate | 1000 MSPS | 1000 MSPS | The maximum sample rate defines the highest signal bandwidth the DAC can synthesize; identical rates mean comparable high-frequency capability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both being unbuffered current-output DACs means similar analog front-end design. |
| Supply Voltage | 3.13 V to 3.47 V | 3.13 V to 3.47 V | Supply voltage compatibility ensures the part can drop into the same power rail design without rework. |
| Package / Case | 100-TQFP (14x14) | 100-TQFP (14x14) | Package and footprint compatibility is essential for physical board-level substitution without layout changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range determines suitability for industrial versus commercial environments; matching ranges indicate equivalent environmental robustness. |
| Interface Type | Parallel / LVDS | Parallel / LVDS | The digital input interface must match the host controller signaling to allow direct connection without glue logic. |
| INL / DNL Linearity | ±4 LSB INL (typical) | ±1 LSB INL (typical) | Integral and differential nonlinearity affect accuracy and distortion; differing linearity specs mean the parts are not functionally equivalent in precision applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778ABSVZ | AD9776BSVZ |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 12 |
| 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 ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±1.5, ±0.65 | ±0.6, ±0.1 |
| 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 AD9776BSVZ?
The AD9778ABSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC), while the AD9776BSVZ is a dual 12-bit, 1 GSPS DAC. Both are members of the Analog Devices AD977x family and share the same 100-lead TQFP_EP package and 1 GSPS maximum update rate, but the AD9778A provides 14-bit resolution versus 12-bit resolution on the AD9776. The AD9778A also offers higher spurious-free dynamic range (SFDR) and lower noise, making it preferable for applications requiring greater signal fidelity.
Are the AD9778ABSVZ and AD9776BSVZ pin-compatible?
Yes. Both devices are offered in the same 100-lead TQFP_EP (thin quad flat pack with exposed pad) package and share the same pinout, as documented in the Analog Devices AD9776/AD9778/AD9779 datasheet. This allows the AD9776BSVZ to be used as a lower-resolution, lower-cost drop-in alternative to the AD9778ABSVZ on the same PCB, provided the system performance requirements are met.
What is the maximum update rate and resolution of each device?
Both the AD9778ABSVZ and AD9776BSVZ support a maximum DAC update rate of 1 GSPS (1,000 MSPS). The AD9778ABSVZ provides 14-bit resolution per DAC channel, while the AD9776BSVZ provides 12-bit resolution per DAC channel. Both are dual-channel DACs with on-chip interpolation filters and a serial peripheral interface for configuration.
Do both parts support the same digital input and interpolation features?
Yes. Both the AD9778ABSVZ and AD9776BSVZ integrate the same digital datapath features, including selectable 2x, 4x, and 8x interpolation filters, a numerically controlled oscillator (NCO) for digital up-conversion, and a flexible LVDS-compatible input interface. Configuration is performed through the same SPI register map, so firmware written for one device is generally portable to the other, subject to resolution-dependent data formatting.
Which part should be selected for higher dynamic performance?
The AD9778ABSVZ should be selected when higher dynamic performance is required. Its 14-bit resolution yields lower quantization noise and higher spurious-free dynamic range (SFDR) compared with the 12-bit AD9776BSVZ. For applications such as wideband communications transmitters or instrumentation where signal-to-noise ratio and spectral purity are critical, the AD9778ABSVZ is the appropriate choice; the AD9776BSVZ is suitable where 12-bit performance is sufficient and cost or power savings are prioritized.
Are the AD9778ABSVZ and AD9776BSVZ available in the same operating temperature range?
Both devices are specified over the industrial temperature range of −40°C to +85°C, as stated in the Analog Devices AD9776/AD9778/AD9779 datasheet. The "BSVZ" suffix in both part numbers denotes the industrial-grade, RoHS-compliant 100-lead TQFP_EP package.
Can the AD9776BSVZ be used as a direct replacement for the AD9778ABSVZ in an existing design?
Because the two devices are pin-compatible and share the same package, register map, and digital interface, the AD9776BSVZ can physically replace the AD9778ABSVZ on the same PCB. However, the replacement reduces DAC resolution from 14 bits to 12 bits, which degrades SNR and SFDR. The design must be revalidated against its spectral and noise requirements before substituting the lower-resolution part.