Part A
AD9739BBCZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4950 PCS
- Package
- BGA-160
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9735BBCZRL is a viable functional replacement candidate for the AD9739BBCZ in many high-speed DAC applications, sharing the same 160-lead CSPBGA package, 1.8 V/3.3 V supply architecture, and 14-bit resolution family. However, the AD9739BBCZ offers a significantly higher maximum update rate (2500 MSPS vs 1200 MSPS) and superior dynamic performance, so the AD9735BBCZRL should only be substituted where the reduced sample rate and SFDR still satisfy the system budget. Validation of the interface timing and reconstruction filter design is recommended before committing to the swap.
Maximum Update Rate
Validation required
Resolution
High match
Package Type
High match
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9735BBCZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5354 PCS
- Package
- LFBGA-160
- 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 | AD9739BBCZ | AD9735BBCZRL | Why it matters |
|---|---|---|---|
| Resolution (Bits) | 14 | 12 | Higher resolution provides finer output amplitude granularity and lower quantization noise, directly affecting signal fidelity in DAC applications. |
| Maximum Update Rate | 2500 MSPS | 1200 MSPS | The update rate determines the maximum synthesizable output frequency and bandwidth; a faster DAC supports higher-frequency signal generation. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both use unbuffered current outputs, requiring external termination and matching analog front-end design for proper voltage conversion. |
| Supply Voltage | 1.8 V / 3.3 V | 1.8 V / 3.3 V | Supply requirements affect power rail design and compatibility with surrounding digital and analog circuitry. |
| Interface Type | LVDS, SPI | LVDS, SPI | The digital input interface must match the driving FPGA/ASIC output standard for reliable high-speed data transfer. |
| Package / Case | 160-LFBGA, CSPBGA | 160-LFBGA, CSPBGA | Package and pinout compatibility determine whether the parts are drop-in replacements on an existing PCB layout. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range must cover the target application environment for guaranteed performance and reliability. |
| Number of D/A Converters | 1 | 1 | Single-channel architecture matches the signal chain requirement; multi-channel needs would require a different device. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9739BBCZ | AD9735BBCZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 1 | 1 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | LVDS - Parallel | LVDS - Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 1.7V ~ 1.9V, 3.1V ~ 3.5V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.1V ~ 3.5V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±1.3, ±0.8 | ±0.50, ±0.25 |
| Architecture | Quad-Switch | Oversampling Interpolating DAC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Settling Time | 13ns (Typ) | - |
Frequently asked questions
What are the key differences between the AD9739BBCZ and the AD9735BBCZRL?
The AD9739BBCZ is a 14-bit, 2.5 GSPS RF digital-to-analog converter, while the AD9735BBCZRL is a 12-bit, 1.2 GSPS RF DAC. The AD9739 offers higher resolution and a higher maximum update rate, whereas the AD9735 provides lower power consumption at a reduced sample rate. Both are members of Analog Devices' TxDAC family and are supplied in a 160-ball CSP_BGA package.
Are the AD9739BBCZ and AD9735BBCZRL pin-compatible?
Both devices are offered in the same 160-ball CSP_BGA (BC-160) package, and Analog Devices documents them as pin-compatible within the TxDAC family, allowing a common PCB footprint. However, designers must verify that the surrounding circuitry and digital interface timing support the specific device being used, since the maximum sample rate and resolution differ.
What is the maximum update rate of each device?
The AD9739BBCZ supports a maximum DAC update rate of 2.5 GSPS. The AD9735BBCZRL supports a maximum update rate of 1.2 GSPS. The higher rate of the AD9739 makes it suitable for wider-bandwidth signal synthesis, while the AD9735 targets applications with lower bandwidth requirements.
What resolution does each DAC provide?
The AD9739BBCZ provides 14-bit resolution, and the AD9735BBCZRL provides 12-bit resolution. The additional two bits of the AD9739 yield lower quantization noise and better spurious-free dynamic range for demanding wideband applications.
What digital input interface do these DACs use?
Both the AD9739BBCZ and AD9735BBCZRL use a dual-port LVDS input interface with a DDR (double data rate) data path, allowing the digital source to deliver samples at half the DAC update rate per port. This interface is common across the TxDAC family and supports high-speed data transfer from FPGAs or ASICs.
Do the AD9739BBCZ and AD9735BBCZRL support the same supply voltages?
Both devices 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 the exact supply rail requirements and decoupling recommendations in the respective datasheets before finalizing the power design.
Can the AD9735BBCZRL be used as a drop-in replacement for the AD9739BBCZ in an existing design?
Because both parts share the same package and interface family, a common footprint is possible, but a drop-in replacement is not guaranteed. The AD9735 has lower resolution (12-bit vs 14-bit) and a lower maximum update rate (1.2 GSPS vs 2.5 GSPS), so the digital data path, clocking, and filter design must be revalidated against the AD9735 datasheet before substitution.
What are the typical applications for each device?
The AD9739BBCZ is typically used in wideband RF signal synthesis, instrumentation, and defense/communications systems requiring high sample rates and 14-bit resolution. The AD9735BBCZRL is used in applications such as broadband communications, cable modem termination systems, and general-purpose waveform generation where 12-bit resolution at up to 1.2 GSPS is sufficient.