Part A
AD9268BCPZ-125
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3100 PCS
- Package
- VFQFN-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9268BCPZ-105 is a functionally compatible replacement candidate for the AD9268BCPZ-125, sharing identical package, pinout, resolution, and interface characteristics, with the primary distinction being a lower maximum sample rate of 105 MSPS versus 125 MSPS. Designers must confirm that the reduced sampling frequency satisfies the application's signal bandwidth and Nyquist requirements before substituting.
Package and Pinout
High match
Resolution and Interface
High match
Maximum Sample Rate
Validation required
Supply Voltage and Power
High match
Parts at a glance
Part B
AD9268BCPZ-105
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3670 PCS
- Package
- VFQFN-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9268BCPZ-125 | AD9268BCPZ-105 | Why it matters |
|---|---|---|---|
| Maximum Sample Rate | 125 MSPS | 105 MSPS | Determines the maximum input signal bandwidth the ADC can digitize; the 125 MSPS part supports wider bandwidths and is not a drop-in replacement where the full 125 MSPS rate is required. |
| Resolution | 16 bits | 16 bits | Both provide the same quantization resolution, so dynamic range and SNR performance class are equivalent. |
| Number of Input Channels | 2 (dual) | 2 (dual) | Confirms both are dual-channel ADCs, so the channel architecture of the system does not need to change. |
| Output Interface | LVDS (serial DDR) | LVDS (serial DDR) | Identical digital output interface means the FPGA/ASIC receiver logic and board routing can remain unchanged. |
| Supply Voltage | 1.8 V | 1.8 V | Same core supply voltage allows reuse of the existing power design and decoupling network. |
| Package | 64-lead LFCSP (9x9 mm) | 64-lead LFCSP (9x9 mm) | Identical package and footprint enable direct PCB drop-in substitution without layout changes. |
| Pin Configuration | Pin-compatible | Pin-compatible | Pin compatibility confirms the two parts can be interchanged on the same board design. |
| Power Consumption (per channel, typical) | Higher (scales with 125 MSPS rate) | Lower (scales with 105 MSPS rate) | The faster device dissipates more power; thermal and power budget must be verified when substituting the lower-speed part. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range means environmental qualification carries over between the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9268BCPZ-125 | AD9268BCPZ-105 |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 125M | 105M |
| Number of Inputs | 2 | 2 |
| Input Type | Differential | Differential |
| Data Interface | LVDS - Parallel, Parallel | LVDS - Parallel, Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 2 | 2 |
| Architecture | Pipelined | Pipelined |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 1.7V ~ 1.9V | 1.7V ~ 1.9V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V | 1.7V ~ 1.9V |
| Features | Simultaneous Sampling | Simultaneous Sampling |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the primary difference between the AD9268BCPZ-125 and the AD9268BCPZ-105?
The primary difference is the maximum sample rate. The AD9268BCPZ-125 is specified for a maximum conversion rate of 125 MSPS, while the AD9268BCPZ-105 is specified for a maximum conversion rate of 105 MSPS. Both are dual-channel, 16-bit analog-to-digital converters in the same LFCSP package and share the same core architecture and feature set.
Are the AD9268BCPZ-125 and AD9268BCPZ-105 pin-compatible and package-compatible?
Yes. Both devices are offered in the same 64-lead LFCSP (CP-64-4) package with identical pin functions, so they are pin-compatible and can use the same PCB land pattern. The difference between the two orderable part numbers is the rated maximum sample rate, not the package or pinout.
Do both devices share the same resolution and channel configuration?
Yes. Both the AD9268BCPZ-125 and AD9268BCPZ-105 are dual-channel, 16-bit ADCs. Each provides two simultaneous sampling channels with 16-bit resolution, and both support the same serial LVDS output interface and on-chip features such as clock duty cycle stabilizer and programmable gain via SPI.
Can the AD9268BCPZ-105 be used as a drop-in replacement for the AD9268BCPZ-125 in an existing design?
Functionally the devices are pin-compatible, but the AD9268BCPZ-105 has a lower maximum sample rate (105 MSPS versus 125 MSPS). It can only be used as a replacement if the system's sampling clock does not exceed 105 MSPS and all other specifications (such as SNR and SFDR at the operating frequency) meet the design requirements. The design must be re-validated against the AD9268BCPZ-105 datasheet before substitution.
Do the two speed grades differ in analog input bandwidth or full-scale input range?
Both devices share the same analog input architecture, with a differential input full-scale range of approximately 2 V p-p and the same analog input bandwidth specification family. The distinguishing parameter between the -125 and -105 grades is the maximum sample rate; other core analog specifications are documented per grade in the respective datasheet and should be compared at the intended operating frequency.
What power supply and clock requirements do these AD9268 variants have?
Both devices operate from a 1.8 V analog supply and a 1.8 V digital supply, with a separate 3.3 V supply for the SPI/control interface, consistent with the AD9268 family. They accept a differential clock input and include an on-chip clock duty cycle stabilizer. The maximum clock frequency differs by grade: 125 MSPS for the AD9268BCPZ-125 and 105 MSPS for the AD9268BCPZ-105.
Which grade should be selected for a design requiring 110 MSPS sampling?
The AD9268BCPZ-125 should be selected, because 110 MSPS exceeds the 105 MSPS maximum conversion rate of the AD9268BCPZ-105. Operating the -105 grade above its rated maximum sample rate is outside the manufacturer's specified conditions and is not supported.
Are both devices specified over the same operating temperature range?
Yes. Both the AD9268BCPZ-125 and AD9268BCPZ-105 are specified over the industrial temperature range of −40°C to +85°C, as documented in the AD9268 datasheet for the BCPZ grade. The speed grade difference does not change the rated ambient temperature range.