Part A
AD9125BCPZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 3542 PCS
- Package
- LFCSP-72
- Series
- 데이터 수집 - 다이 모드 변환기(DAC)
Replacement verdict
Not a drop-in replacement
The AD9129BBCZ and AD9125BCPZ are not drop-in replacements for one another. Although both are dual-channel high-speed DACs from the same manufacturer family, they differ fundamentally in resolution, maximum update rate, digital interface, and package footprint, so a direct board-level substitution is not feasible without redesign.
Different resolution
Different sample rate
Different digital interface
Different package footprint
Parts at a glance
Part B
AD9129BBCZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 2729 PCS
- Package
- LFCSP-64
- Series
- 데이터 수집 - 다이 모드 변환기(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 | AD9129BBCZ | AD9125BCPZ | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 14 bit | 16 bit | Higher resolution provides finer output amplitude granularity and lower quantization noise, which directly affects signal fidelity in synthesis applications. |
| Maximum Update Rate | 5.7 GSPS | 1 GSPS | The update rate determines the maximum synthesizable output frequency and the ability to generate wideband signals directly in the digital domain. |
| Number of DAC Channels | 1 | 2 | Dual channels enable I/Q complex signal generation or two independent outputs, while a single channel limits the device to one output stream. |
| Digital Interface | LVDS (DDR) | LVDS (DDR) | The interface type and width determine the FPGA/ASIC pin count and the maximum data throughput that can be delivered to the DAC. |
| Output Current Range | 9.5 mA to 34.4 mA | 8.7 mA to 31.7 mA | Output current range affects the achievable output power and the choice of matching network or transformer at the DAC output. |
| Package | 160-ball CSP-BGA | 72-lead LFCSP | Package footprint and pinout must match the PCB layout; a different package requires a board redesign and cannot be a drop-in replacement. |
| Supply Voltage | 1.8 V / 3.3 V | 1.8 V / 3.3 V | Supply rails must be compatible with the existing power architecture; differing rails would require additional regulators or level shifting. |
| Power Consumption (Typical) | 1.0 W | 0.35 W | Power dissipation impacts thermal design, supply sizing, and whether the existing cooling solution is adequate for the replacement part. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the target application environment to ensure reliable operation and datasheet-compliant performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9125BCPZ | AD9129BBCZ |
|---|---|---|
| Series | TxDAC+® | - |
| Part Status | Active | Active |
| Number of Bits | 16 | 14 |
| Number of D/A Converters | 2 | 1 |
| Settling Time | 20ns (Typ) | 13ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | LVDS - Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 1.7V ~ 1.9V |
| Voltage - Supply, Digital | 1.71V ~ 1.89V | 1.7V ~ 1.9V |
| INL / DNL(LSB) | ±3.7, ±2.1 | 1.4, 1.1 |
| Architecture | Current Source | Quad-Switch |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD9129BBCZ and the AD9125BCPZ?
The AD9129BBCZ is a single-channel 14-bit RF digital-to-analog converter (DAC) with a maximum update rate of 5.7 GSPS, featuring an LVDS data interface and an integrated 2x interpolator. The AD9125BCPZ is a dual-channel 16-bit DAC with a maximum update rate of 1000 MSPS, featuring a CMOS data interface and on-chip numeric controlled oscillator (NCO) plus digital interpolation filters. The AD9129BBCZ targets high-frequency RF synthesis, while the AD9125BCPZ targets wideband dual-channel transmit applications.
Are the AD9129BBCZ and AD9125BCPZ pin-to-pin or package compatible?
No. The AD9129BBCZ is supplied in a 72-lead LFCSP (10 mm × 10 mm) package, while the AD9125BCPZ is supplied in a 72-lead LFCSP (10 mm × 10 mm) package as well, but the pin functions and internal architecture differ, so they are not pin-compatible or directly interchangeable. Each requires its own PCB land pattern and layout per the respective datasheet.
How do the resolution and sample rate of the AD9129BBCZ compare with the AD9125BCPZ?
The AD9129BBCZ provides 14-bit resolution at up to 5.7 GSPS, whereas the AD9125BCPZ provides 16-bit resolution at up to 1000 MSPS. The AD9129BBCZ prioritizes very high update rate for RF generation, while the AD9125BCPZ prioritizes higher amplitude resolution for dual-channel baseband or IF synthesis.
What data interface does each device use?
The AD9129BBCZ uses an LVDS (low-voltage differential signaling) input data interface to support its high sample rate. The AD9125BCPZ uses a CMOS input data interface. This difference affects FPGA/ASIC I/O planning, trace routing, and board layout.
Do both parts include digital interpolation or upconversion features?
The AD9129BBCZ includes a 2x digital interpolator. The AD9125BCPZ includes digital interpolation filters and a numerically controlled oscillator (NCO) for digital upconversion. The feature sets are not identical, so system-level signal-chain design must be validated against each datasheet.
Can the AD9125BCPZ be used as a drop-in replacement for the AD9129BBCZ in an existing design?
No. Because the two devices differ in resolution (14-bit vs 16-bit), maximum update rate (5.7 GSPS vs 1000 MSPS), data interface (LVDS vs CMOS), and digital signal processing features, a direct drop-in replacement is not possible. Any substitution requires a full design review against the manufacturer datasheet.
Which device is better suited for high-frequency RF synthesis and which for dual-channel transmit?
The AD9129BBCZ, with its 5.7 GSPS update rate and 14-bit resolution, is intended for high-frequency RF synthesis and wideband signal generation. The AD9125BCPZ, with dual 16-bit channels, 1000 MSPS update rate, and integrated NCO/interpolation, is intended for dual-channel transmit and wideband baseband/IF applications. Selection should be based on the target frequency plan, channel count, and resolution requirements.
What are the supply and power considerations when comparing these two DACs?
Both devices require multiple supply rails and careful power sequencing per their datasheets. The AD9129BBCZ, operating at up to 5.7 GSPS, has significantly higher power consumption than the AD9125BCPZ at 1000 MSPS. Thermal design, decoupling, and PCB copper planning must be validated against the respective datasheet specifications for each part.