Part A
AD9739ABBCZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3752 PCS
- Package
- BGA-160
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9739ABBCZ and AD9734BBC are not drop-in replacements for one another. Although both are dual-channel 14-bit current-steering DACs in a 160-ball CSP-BGA package, they differ fundamentally in maximum update rate, output bandwidth, and supported data interface, so the AD9734BBC cannot directly substitute the AD9739ABBCZ in a design without revalidation of the signal chain, clocking, and interface timing.
Different maximum update rate
Different output bandwidth
Different data interface
Different power consumption
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9739ABBCZ | AD9734BBC | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | 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 directly limits the bandwidth of the generated signal. |
| Number of DAC Channels | 1 | 1 | Channel count defines how many independent analog outputs are available; both are single-channel devices. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required, such as termination and transformer coupling. |
| Data Interface | LVDS - Parallel | LVDS - Parallel | The digital input interface must match the driving FPGA/ASIC to ensure reliable high-speed data transfer. |
| Supply Voltage | 1.8V, 3.3V | 1.8V, 3.3V | Supply rail requirements determine power delivery design and compatibility with the surrounding system. |
| Package / Case | 160-LFBGA, CSPBGA | 160-LFBGA, CSPBGA | Package footprint and pinout must match for board-level drop-in compatibility. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | The temperature range must cover the target application environment for reliable operation. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style must match the assembly process and PCB design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9739ABBCZ | AD9734BBC |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 13µs (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) | ±2.5, ±2 | - |
| Architecture | Quad-Switch | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9739ABBCZ and the AD9734BBC?
The AD9739ABBCZ is a 14-bit, 2.5 GSPS RF digital-to-analog converter, while the AD9734BBC is a 10-bit, 1.2 GSPS DAC. The AD9739ABBCZ offers higher resolution and a faster update rate, whereas the AD9734BBC provides lower resolution and speed but typically lower power consumption. Both are part of Analog Devices' TxDAC family and are housed in a 160-ball CSP_BGA package.
Are the AD9739ABBCZ and AD9734BBC pin-compatible?
Yes, both devices are offered in the same 160-ball CSP_BGA (BC) package with a compatible ballout, allowing the AD9734BBC to be used as a drop-in replacement in designs originally laid out for the AD9739ABBCZ, provided the system timing and resolution requirements are revalidated.
What is the maximum update rate of each device?
The AD9739ABBCZ supports a maximum DAC update rate of 2.5 GSPS, while the AD9734BBC supports a maximum update rate of 1.2 GSPS. The higher update rate of the AD9739ABBCZ enables wider signal bandwidths and higher oversampling ratios in RF synthesis applications.
What resolution does each DAC provide?
The AD9739ABBCZ provides 14-bit resolution, and the AD9734BBC provides 10-bit resolution. The 14-bit resolution of the AD9739ABBCZ yields lower quantization noise and better spurious-free dynamic range (SFDR) performance compared with the 10-bit AD9734BBC.
Do both parts support the same digital input interface?
Both devices use a dual-port LVDS input interface with a DDR (double data rate) data path. The AD9739ABBCZ accepts 14-bit input words, while the AD9734BBC accepts 10-bit input words, so the digital source must be configured to match the resolution of the selected device.
What are the typical power consumption figures for these DACs?
The AD9739ABBCZ typically consumes approximately 1.1 W at 2.5 GSPS, while the AD9734BBC typically consumes approximately 0.45 W at 1.2 GSPS. The lower power of the AD9734BBC makes it preferable for power-sensitive designs that do not require 14-bit resolution or 2.5 GSPS operation.
Can the AD9734BBC be used in an existing AD9739ABBCZ design without hardware changes?
Because both parts share the same 160-ball CSP_BGA package and pinout, the AD9734BBC can be placed on an existing AD9739ABBCZ PCB without layout changes. However, the digital input data width, clock rate, and reconstruction filter must be revalidated, since the AD9734BBC is limited to 10-bit resolution and 1.2 GSPS.
What are the typical applications for each device?
The AD9739ABBCZ is typically used in wideband RF signal synthesis, cable modem termination systems, and high-speed instrumentation where 14-bit resolution at 2.5 GSPS is required. The AD9734BBC is typically used in lower-bandwidth transmit paths, such as wireless infrastructure and general-purpose waveform generation, where 10-bit resolution at 1.2 GSPS is sufficient.