Part A
AD9945KCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5858 PCS
- Package
- WFQFN-32
- Series
- Interface - Interfaces de Sensor e Detector
Replacement verdict
Compatible functional replacement candidate
The AD9945KCPZ and AD9944KCP are both complete 12-bit CCD signal processors from Analog Devices in the same 32-lead LFCSP package, sharing core analog front-end architecture and supply requirements. The AD9945KCPZ offers a higher maximum sampling rate (40 MSPS versus 25 MSPS), making it a viable functional upgrade candidate for the AD9944KCP in most designs, provided the system timing and clocking are validated against the higher speed grade.
Resolution and ADC Architecture
High match
Package and Pin Configuration
High match
Maximum Sampling Rate
Validation required
Supply Voltage Requirements
High match
Parts at a glance
Part B
AD9944KCP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6681 PCS
- Package
- WFQFN-32
- Series
- Interface - Interfaces de Sensor e Detector
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9945KCPZ | AD9944KCP | Why it matters |
|---|---|---|---|
| Resolution (ADC bits) | 12 bit | 12 bit | Bit depth determines the dynamic range and quantization precision of the digitized signal; both are 12-bit so this is not a differentiator. |
| Maximum Conversion Rate | 40 MSPS | 40 MSPS | Sample rate sets the maximum pixel throughput; identical rates mean comparable speed capability for imaging front-ends. |
| Number of Input Channels | 1 (single channel) | 1 (single channel) | Channel count determines how many analog signal paths can be digitized; both are single-channel AFE devices. |
| Internal Reference Voltage | 1.0 V (internal) | 1.0 V (internal) | The reference sets the ADC full-scale input range; matching references support similar signal swing requirements. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply range must match the system rail; identical ranges allow drop-in power compatibility. |
| Package Type | 32-Lead LFCSP | 32-Lead LFCSP | Package and footprint affect PCB layout and assembly; matching packages simplify board-level substitution. |
| Operating Temperature Range | -20°C to +85°C | -20°C to +85°C | Temperature range defines environmental limits; identical ratings mean equivalent thermal robustness. |
| Correlated Double Sampling (CDS) | Yes | Yes | CDS reduces reset noise in CCD/CMOS sensors; both supporting it makes them functionally comparable for imaging applications. |
| Programmable Gain Amplifier (PGA) Range | 6 dB to 42 dB | 6 dB to 42 dB | PGA range determines the ability to amplify weak sensor signals; matching ranges support similar sensitivity tuning. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9945KCPZ | AD9944KCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | CCD Signal Processor, 12-Bit | CCD Signal Processor, 12-Bit |
| Input Type | Logic | Logic |
| Output Type | Logic | Logic |
| Operating Temperature | -20°C ~ 85°C | -20°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD9945KCPZ and the AD9944KCP?
The AD9945KCPZ is a complete 12-bit, 40 MSPS analog front end (AFE) for CCD/CMOS imaging applications, while the AD9944KCP is a 12-bit, 25 MSPS AFE in the same family. The primary differences are the maximum sampling rate (40 MSPS vs. 25 MSPS) and the package/ordering code suffix (KCPZ vs. KCP), which reflects lead-free (Pb-free) versus leaded packaging respectively.
Are the AD9945KCPZ and AD9944KCP pin-compatible?
Both devices are offered in a 32-lead LFCSP package with the same pinout and footprint, allowing board-level interchangeability. However, because the AD9945KCPZ supports a higher maximum clock rate (40 MSPS) than the AD9944KCP (25 MSPS), the system clock and timing must be validated for the target device before substitution.
What is the maximum sampling rate of each device?
The AD9945KCPZ is specified for a maximum conversion rate of 40 MSPS, while the AD9944KCP is specified for a maximum conversion rate of 25 MSPS. Designs requiring pixel rates above 25 MSPS must use the AD9945KCPZ.
Do both parts provide the same ADC resolution and input range?
Yes. Both the AD9945KCPZ and AD9944KCP integrate a 12-bit analog-to-digital converter with a programmable gain amplifier (PGA) and a correlated double sampler (CDS) front end. Both provide a 12-bit digital output and support similar programmable input ranges, making them functionally comparable for imaging signal chains within their respective speed ratings.
What does the "Z" suffix in AD9945KCPZ indicate compared to AD9944KCP?
The "Z" suffix in AD9945KCPZ denotes a lead-free (Pb-free/RoHS-compliant) package, whereas the AD9944KCP ordering code does not carry the Z suffix and corresponds to the leaded package version. For new designs requiring RoHS compliance, the AD9945KCPZ is the appropriate choice.
Can the AD9944KCP be replaced by the AD9945KCPZ in an existing design?
Because both devices share the same 32-lead LFCSP package and pinout, the AD9945KCPZ can generally serve as a higher-speed replacement for the AD9944KCP, provided the system clock, timing registers, and power supply decoupling are validated against the AD9945 datasheet. The higher 40 MSPS capability of the AD9945KCPZ does not degrade performance when operated at the lower 25 MSPS rate of the AD9944KCP.
What are the typical applications for these AFEs?
Both the AD9945KCPZ and AD9944KCP are analog front ends intended for CCD and CMOS image sensor signal processing in digital still cameras, camcorders, and industrial/medical imaging systems. The AD9945KCPZ's 40 MSPS rate suits higher-resolution or higher-frame-rate sensors, while the AD9944KCP's 25 MSPS rate suits lower-speed imaging applications.