Part A
AD9739BBCZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4950 PCS
- Package
- BGA-160
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9739BBCZ and AD9734BBC are both 14-bit high-speed DACs from the same Analog Devices TxDAC family, but they are not drop-in replacements. The AD9739BBCZ offers a significantly higher maximum update rate and a different digital input interface, while the AD9734BBC provides lower power consumption and a narrower parallel LVDS input. Designers must re-validate the digital interface, clocking, and thermal budget before substituting one for the other.
Different maximum update rate
Different digital input interface
Different power consumption
Different clocking requirements
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9739BBCZ | AD9734BBC | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Higher resolution provides finer output quantization and lower quantization noise, directly affecting achievable signal fidelity and SFDR. |
| Maximum Update Rate | 2500 MSPS | 1200 MSPS | The maximum DAC clock rate determines the highest synthesizable output frequency and the width of the usable Nyquist band. |
| Output Type | Current-steering DAC (differential current output) | Current-steering DAC (differential current output) | Both use current-steering architecture, so the analog interface and output termination requirements are functionally similar. |
| Digital Input Interface | LVDS (dual-port, DDR) | LVDS (dual-port, DDR) | Matching LVDS dual-port DDR input simplifies FPGA/ASIC interfacing and pin-compatible board design. |
| Supply Voltage | 1.8 V and 3.3 V | 1.8 V and 3.3 V | Identical supply rails allow reuse of the same power tree and decoupling network in a replacement design. |
| Package | 160-ball CSP-BGA | 160-ball CSP-BGA | Same package and ball count enable a drop-in footprint replacement without PCB layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature ratings ensure the parts are interchangeable across the same environmental conditions. |
| SFDR (at rated update rate) | Higher SFDR due to 14-bit resolution | Lower SFDR due to 10-bit resolution | Spurious-free dynamic range affects spectral purity and is a key selection criterion for communications and instrumentation DACs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9739BBCZ | AD9734BBC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 13ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | LVDS - Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 1.7V ~ 1.9V, 3.1V ~ 3.5V | - |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.1V ~ 3.5V | - |
| INL / DNL(LSB) | ±1.3, ±0.8 | - |
| Architecture | Quad-Switch | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9739BBCZ and the AD9734BBC?
The AD9739BBCZ is a 14-bit, 2.5 GSPS RF digital-to-analog converter, while the AD9734BBC is a 10-bit, 1.2 GSPS DAC. The AD9739BBCZ offers higher resolution and a faster maximum update rate, making it suitable for higher-bandwidth applications. Both are members of Analog Devices' TxDAC family and are pin-compatible in the same 160-ball CSP_BGA package.
Are the AD9739BBCZ and AD9734BBC pin-compatible?
Yes. Both devices are offered in the same 160-ball CSP_BGA package (12 mm × 12 mm) and share a common pinout, which allows board designs to accommodate either converter. However, designers must verify all supply, clocking, and interface requirements against the respective datasheets before substitution.
What is the maximum update rate of each converter?
The AD9739BBCZ supports a maximum DAC update rate of 2.5 GSPS. The AD9734BBC supports a maximum update rate of 1.2 GSPS. The higher update rate of the AD9739BBCZ enables wider signal bandwidths and higher oversampling ratios in RF synthesis applications.
What resolution does each DAC provide?
The AD9739BBCZ provides 14-bit resolution, while the AD9734BBC provides 10-bit resolution. The additional bits on the AD9739BBCZ yield lower quantization noise and better spurious-free dynamic range (SFDR) performance for demanding wideband applications.
Do both parts use the same digital input interface?
Both devices use a dual-port LVDS input interface for high-speed data transfer. The AD9739BBCZ, with its higher sample rate, requires careful attention to LVDS timing and PCB layout to maintain signal integrity at 2.5 GSPS, whereas the AD9734BBC operates at the lower 1.2 GSPS rate.
What are the typical applications for these DACs?
Both converters target wideband RF and communications systems. The AD9739BBCZ is typically used in high-performance applications such as wideband cellular infrastructure, radar, and instrumentation where 14-bit resolution and 2.5 GSPS update rates are required. The AD9734BBC suits applications with lower bandwidth and resolution requirements, such as cable modem termination systems and general-purpose signal synthesis.
What supply voltages do these converters require?
Both the AD9739BBCZ and AD9734BBC operate from a 1.8 V digital supply and a 3.3 V analog supply, consistent with the Analog Devices TxDAC family architecture. Designers should confirm exact supply rail tolerances and sequencing requirements in the respective datasheets.
Can the AD9734BBC be used as a drop-in replacement for the AD9739BBCZ?
Not directly. Although the devices are pin-compatible, the AD9734BBC has lower resolution (10-bit vs. 14-bit) and a lower maximum update rate (1.2 GSPS vs. 2.5 GSPS). A drop-in replacement would only be acceptable if the system's bandwidth, resolution, and dynamic performance requirements are satisfied by the lower-specification AD9734BBC, and all parameters are validated against the datasheet.