Part A
AD9778BSVZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2822 個数
- Package
- TQFP-100
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD9778BSVZ and AD9773BSV are both dual-channel 12-bit/14-bit high-speed DACs from Analog Devices, but they differ in resolution, maximum update rate, and dynamic performance, so the AD9778BSVZ cannot be used as a direct drop-in substitute for the AD9773BSV without design validation.
Different resolution
Different update rate
Different dynamic performance
Validation required
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 | AD9773BSV | Why it matters |
|---|---|---|---|
| Resolution (DAC bits) | 14 | 12 | Higher resolution provides finer output quantization and lower quantization noise, affecting achievable signal fidelity and SFDR. |
| Maximum Update Rate | 1000 MSPS | 400 MSPS | Determines the maximum DAC sample rate and thus the usable output bandwidth and interpolation capability. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q signal generation for complex modulation schemes. |
| Package / Mounting | 100-TQFP (14x14), Surface Mount | 80-TQFP (12x12), Surface Mount | Different package footprints and pin counts affect PCB layout and are not drop-in compatible. |
| Supply Voltage | 3.3 V (analog and digital) | 3.3 V (analog and digital) | Supply voltage compatibility is required for direct board-level substitution. |
| Output Type | Current-steering DAC (differential current output) | Current-steering DAC (differential current output) | Output architecture determines the external interface and reconstruction filter requirements. |
| On-chip Interpolation | 2x/4x/8x selectable | 2x/4x/8x selectable | Interpolation filters relax the input data rate and simplify analog reconstruction filtering. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range ensures reliable operation across harsh environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9778BSVZ | AD9773BSV |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 2 | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | Internal | - |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | - |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | - |
| INL / DNL(LSB) | ±1, ±0.65 | - |
| Architecture | Oversampling Interpolating DAC | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9778BSVZ and the AD9773BSV?
The AD9778BSVZ is a dual 14-bit, 1 GSPS digital-to-analog converter (DAC) with an on-chip 2x/4x/8x interpolating filter and a 32-bit digital datapath. The AD9773BSV is a dual 12-bit, 400 MSPS DAC with 2x/4x/8x interpolation. The AD9778BSVZ offers higher resolution (14-bit vs 12-bit) and a significantly higher maximum update rate (1 GSPS vs 400 MSPS), while both share the same 80-lead TQFP_EP package and similar digital interface architecture.
Are the AD9778BSVZ and AD9773BSV pin-compatible?
Both devices are offered in the same 80-lead TQFP_EP (SV) package, and their pinouts are designed to be functionally compatible within the same AD977x family. However, because the AD9778BSVZ provides 14-bit resolution versus 12-bit on the AD9773BSV, designers must verify the digital input bit mapping and any mode-specific pin functions against the respective datasheets before treating them as drop-in replacements.
What is the maximum DAC update rate for each device?
The AD9778BSVZ supports a maximum DAC update rate of 1 GSPS. The AD9773BSV supports a maximum DAC update rate of 400 MSPS. The higher update rate of the AD9778BSVZ makes it suitable for wider-bandwidth signal synthesis and higher intermediate-frequency (IF) applications.
What resolution does each DAC provide?
The AD9778BSVZ is a dual 14-bit DAC, providing 16,384 output levels per channel. The AD9773BSV is a dual 12-bit DAC, providing 4,096 output levels per channel. The 14-bit resolution of the AD9778BSVZ yields lower quantization noise and better spurious-free dynamic range (SFDR) performance for demanding waveform generation.
Do both parts include the same interpolation filter options?
Yes. Both the AD9778BSVZ and the AD9773BSV integrate selectable 2x, 4x, and 8x digital interpolation filters, along with a programmable FIR filter and a digital quadrature modulator (fDAC/2, fDAC/4, or fDAC/8) in their digital datapath. This allows input data rates to be lower than the DAC update rate while preserving spectral performance.
What is the digital input interface on these converters?
Both devices use a dual-channel, parallel CMOS-compatible digital input interface with a maximum input data rate that depends on the interpolation ratio and the DAC update rate. The AD9778BSVZ, with its 1 GSPS DAC rate, supports higher input data rates than the AD9773BSV at equivalent interpolation settings. Designers should confirm timing and setup/hold specifications in the respective datasheets.
Can the AD9773BSV be used as a lower-cost alternative to the AD9778BSVZ?
Only if the application can tolerate 12-bit resolution and a maximum DAC update rate of 400 MSPS. The AD9773BSV is not a functional substitute where 14-bit resolution or update rates above 400 MSPS are required. Substitution must be validated against the system's SFDR, SNR, and bandwidth requirements using the manufacturer datasheets.
What are the typical applications for each device?
The AD9778BSVZ is typically used in wideband communications transmitters, radar and instrumentation systems, and high-frequency arbitrary waveform generation where 14-bit resolution and 1 GSPS update rates are beneficial. The AD9773BSV is used in base-station transmit paths, cable modem termination systems, and other applications requiring dual 12-bit DACs at up to 400 MSPS with digital interpolation.