Part A
AD9125BCPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3542 PCS
- Package
- LFCSP-72
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9125BCPZ is a viable functional replacement candidate for the AD9122BCPZ in many dual-channel DAC applications, sharing the same 72-lead LFCSP footprint, 16-bit resolution, and 1.8 V/3.3 V supply architecture. However, the higher maximum update rate and differing on-chip PLL and interpolation capabilities of the AD9125BCPZ require validation against the target system's clocking, data-rate, and signal-chain requirements before substitution is confirmed.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
On-Chip PLL and Interpolation
Validation required
Parts at a glance
Part B
AD9122BCPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5001 PCS
- Package
- LFCSP-72
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9122BCPZ | AD9125BCPZ | Why it matters |
|---|---|---|---|
| Resolution (DAC Bits) | 16 | 16 | Bit depth determines the quantization noise floor and achievable dynamic range of the DAC; both are 16-bit so this is not a differentiator. |
| Maximum Update Rate | 1230 MSPS | 1000 MSPS | The maximum DAC sample rate sets the highest synthesizable signal bandwidth; the AD9122 offers a higher ceiling for wideband applications. |
| Number of DAC Channels | 2 | 2 | Dual channels enable I/Q complex signal generation; both parts are dual DACs so channel count is equivalent. |
| Digital Interface | LVDS (dual-port, DDR) | LVDS (dual-port, DDR) | The input data interface must match the upstream FPGA/ASIC output; identical LVDS DDR interfaces allow similar board-level integration. |
| On-Chip Interpolation | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation filters relax the input data rate and simplify analog reconstruction filtering; matching options preserve signal-chain design compatibility. |
| Digital Up-Converter (NCO) | Yes (32-bit NCO) | Yes (32-bit NCO) | An integrated NCO enables digital frequency up-conversion, reducing external components; both include this feature. |
| Supply Voltage | 1.8 V / 3.3 V | 1.8 V / 3.3 V | Supply rails must match the board power architecture; identical rails simplify power design and substitution. |
| Package | 72-Lead LFCSP (10x10 mm) | 72-Lead LFCSP (10x10 mm) | Package footprint and thermal characteristics affect PCB layout; identical packages allow drop-in replacement on existing boards. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range determines suitability for harsh environments; both meet the same industrial grade. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9125BCPZ | AD9122BCPZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Number of D/A Converters | 2 | 2 |
| Settling Time | 20ns (Typ) | 20ns (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 | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.71V ~ 1.89V | 1.71V ~ 1.89V |
| INL / DNL(LSB) | ±3.7, ±2.1 | ±3.7, ±2.1 |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9122BCPZ and AD9125BCPZ?
The AD9122BCPZ is a dual 16-bit, 1230 MSPS TxDAC+ digital-to-analog converter, while the AD9125BCPZ is a dual 16-bit, 1000 MSPS TxDAC+ DAC. Both are offered in a 72-lead LFCSP package and support the same serial LVDS interface and on-chip numeric controlled oscillator, but the AD9122 provides a higher maximum update rate (1230 MSPS vs 1000 MSPS) and correspondingly higher input data rate per channel.
Are the AD9122BCPZ and AD9125BCPZ pin-compatible?
Yes. Both devices are specified in the same 72-lead LFCSP (CP-72-4) package with the same pinout, which allows a common PCB footprint. However, pin compatibility does not guarantee functional equivalence; the maximum sample rate, clock input requirements, and some timing specifications differ between the two parts.
What is the maximum DAC update rate for each device?
The AD9122BCPZ supports a maximum DAC update rate of 1230 MSPS. The AD9125BCPZ supports a maximum DAC update rate of 1000 MSPS. Designs requiring the higher rate must use the AD9122, while the AD9125 is limited to 1000 MSPS operation.
Do both parts support the same digital interface?
Yes. Both the AD9122BCPZ and AD9125BCPZ use a dual serial LVDS data input interface with a maximum input data rate per channel of 500 MSPS (AD9122) and 500 MSPS (AD9125) respectively, and both include an on-chip 32-bit NCO plus digital interpolation filters. The interface architecture and register map are closely related, but the maximum clock and data rates differ.
Can the AD9125BCPZ be used as a drop-in replacement for the AD9122BCPZ?
Not unconditionally. Although the package and pinout are the same, the AD9125BCPZ has a lower maximum DAC update rate (1000 MSPS vs 1230 MSPS) and different timing and clock specifications. A drop-in replacement is only valid if the target design operates within the AD9125's 1000 MSPS limit and all timing, PLL, and interface parameters are re-verified against the AD9125 datasheet.
What are the typical applications for these dual 16-bit DACs?
Both the AD9122BCPZ and AD9125BCPZ are intended for wideband communications and signal synthesis applications, including cellular base station transmitters, broadband communications systems, and digital predistortion loops, where dual high-speed 16-bit DACs with interpolation and NCO functionality are required.
Do both devices operate from the same supply voltages?
Yes. Both the AD9122BCPZ and AD9125BCPZ operate from a 1.8 V digital supply and a 3.3 V analog supply, with a 1.8 V or 3.3 V IOVDD for the digital interface, consistent with the TxDAC+ family specifications. Designers should confirm exact supply tolerances and current consumption in the respective datasheets.