ADA4945-1ACPZ - Low-Noise FDA ADC Driver | Analog Devices
MPN: ADA4945-1ACPZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
Drop-in alternatives for ADA4945-1ACPZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ADA4940-1ACPZ-R7
β Drop-Inπ Reference alternative (not in catalog)
ADA4945-1ACPZ-R2
β Drop-Inπ Reference alternative (not in catalog)
ADA4945-1ACPZ-R7
β Drop-Inπ Reference alternative (not in catalog)
ADA4945-1ACPZ-RL
β Drop-Inπ Reference alternative (not in catalog)
THS4505
β Drop-Inπ Reference alternative (not in catalog)
AD8139ACPZ
β Drop-Inπ Reference alternative (not in catalog)
ADA4945-1ACPZ Maximum Ratings & Electrical Characteristics
| Type | Fully Differential Amplifier |
| Supply Voltage Range | 3 V to 10 V |
| Package | 16-LFCSP (3x3 mm) |
| Offset Drift | 0.1 Β΅V/Β°C |
| Power Modes | 2 (full power, low power) |
| Output Type | Rail-to-Rail |
| Number of Channels | 1 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| Quiescent Current (Full Power) | [DATA_NEEDED: quiescent current] |
| Bandwidth (Full Power) | [DATA_NEEDED: bandwidth] |
| Slew Rate | [DATA_NEEDED: slew rate] |
| Input Voltage Noise | [DATA_NEEDED: input voltage noise] |
| Output Common-Mode Control | Yes (VOCM pin) |
| RoHS Status | Compliant |
ADA4945-1ACPZ Pin Configuration
| Pin 1 | VOCM β Output common-mode voltage control |
| Pin 2 | OUT+ β Positive differential output |
| Pin 3 | OUT- β Negative differential output |
| Pin 4 | V+ β Positive supply |
| Pin 5 | V- β Negative supply |
| Pin 6 | IN+ β Non-inverting input |
| Pin 7 | IN- β Inverting input |
| Pin 8 | PD β Power-down control |
| Pin 9 | NC β No connect |
| Pin 10 | NC β No connect |
| Pin 11 | NC β No connect |
| Pin 12 | NC β No connect |
| Pin 13 | NC β No connect |
| Pin 14 | NC β No connect |
| Pin 15 | NC β No connect |
| Pin 16 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADA4945-1ACPZ is suitable for 6 applications: High-Speed ADC Driver, Medical Imaging, Communications Receivers, Industrial Instrumentation, Test and Measurement, Audio Processing.
High-Speed ADC Driver
The ADA4945-1ACPZ is ideal for driving high-speed ADCs in data acquisition systems. Its low noise and distortion ensure that the ADC's performance is not degraded by the driver. The device's rail-to-rail output and output common-mode control allow precise setting of the ADC input common-mode voltage, maximizing dynamic range. With a supply range of 3 V to 10 V, it can interface with a variety of ADCs, including the AD9680 and AD9268. The two power modes allow optimization for either maximum bandwidth or reduced power consumption, making it suitable for both high-performance and power-sensitive designs.
Recommended
Medical Imaging
In medical imaging systems such as ultrasound and MRI, the ADA4945-1ACPZ provides the low noise and low distortion required to preserve signal integrity. Its low DC offset drift of 0.1 Β΅V/Β°C ensures accurate DC performance over temperature, which is critical for imaging applications. The device's wide supply range (3 V to 10 V) allows integration into various power architectures. The compact 16-lead LFCSP package saves board space, and the two power modes enable power optimization for portable or battery-powered imaging devices. The ADA4945-1 can drive ADCs like the AD9656, which are used in medical imaging front-ends.
Recommended
Communications Receivers
The ADA4945-1ACPZ is well-suited for communications receivers, where it drives ADCs in IF or baseband stages. Its low noise and high linearity help maintain signal quality in the presence of strong interferers. The device's output common-mode control allows easy interface to ADCs with specific common-mode requirements. The two power modes enable trade-offs between performance and power consumption, which is important in battery-operated or power-constrained communication devices. The wide supply range supports both 3.3 V and 5 V systems. The ADA4945-1 can drive ADCs like the AD9680, which are used in software-defined radios and base stations.
Recommended
Industrial Instrumentation
In industrial instrumentation, the ADA4945-1ACPZ provides accurate signal conditioning for sensors and transducers. Its low offset drift ensures stable DC performance over temperature, which is essential for precision measurements. The device's rail-to-rail output maximizes dynamic range, and the wide supply range (3 V to 10 V) accommodates various industrial power rails. The compact package is suitable for space-constrained industrial modules. The two power modes allow designers to optimize for either performance or power consumption. The ADA4945-1 can drive ADCs like the AD7175-2, which are used in industrial data acquisition systems.
Recommended
Test and Measurement
The ADA4945-1ACPZ is ideal for test and measurement equipment, such as oscilloscopes and spectrum analyzers, where signal fidelity is paramount. Its low noise and low distortion ensure accurate signal reproduction. The device's wide supply range and rail-to-rail output make it versatile for various front-end designs. The two power modes allow optimization for either high bandwidth or low power, depending on the instrument's requirements. The compact LFCSP package is suitable for dense PCB layouts. The ADA4945-1 can drive ADCs like the AD9268, which are used in high-speed digitizers.
Recommended
Audio Processing
Although primarily designed for ADC driving, the ADA4945-1ACPZ can be used in high-end audio processing systems where differential signaling is beneficial. Its low noise and low distortion help preserve audio quality. The device's rail-to-rail output and wide supply range (3 V to 10 V) make it suitable for various audio power rails. The two power modes allow trade-offs between performance and power consumption, which is useful in portable audio devices. The compact package is ideal for space-constrained audio modules. The ADA4945-1 can drive audio ADCs like the AD1877, which is available on XAIPART.
Recommended
Recommended Products Summary
Engineering reference data for ADA4945-1ACPZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4940-1ACPZ-R7 | THS4505 | AD8139ACPZ |
|---|---|---|---|---|
| Package | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Supply Voltage Range | 3 V to 10 V | 3 V to 7 V | 3 V to 5 V | 3 V to 5 V |
| Offset Drift | 0.1 Β΅V/Β°C | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Power Modes | 2 | 1 | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Output Limiting | Yes | No | No | No |
| Quiescent Current | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Higher supply voltage range (up to 10 V) (vs ADA4940-1ACPZ-R7)
- Output limiting feature (vs THS4505)
- Two selectable power modes (vs AD8139ACPZ)
Design Notes
For optimal performance, place the ADA4945-1ACPZ close to the ADC it drives to minimize trace length and parasitic capacitance. Use a solid ground plane and ensure proper decoupling of the power supply pins with 0.1 Β΅F and 10 Β΅F capacitors. The exposed pad on the LFCSP package should be soldered to the PCB ground for thermal and electrical performance.
The ADA4945-1ACPZ operates over a 3 V to 10 V supply range. Ensure that the supply voltage is within this range and that the power supply is well-regulated and low-noise. The two power modes allow trade-offs between bandwidth and power consumption; select the appropriate mode for your application. In full power mode, the quiescent current is higher, so consider thermal dissipation in the design.
When using the ADA4945-1ACPZ, ensure that the output common-mode voltage (VOCM) is set correctly to match the ADC's input common-mode range. Incorrect VOCM settings can degrade ADC performance. Also, avoid exceeding the absolute maximum supply voltage of 10 V, as this can damage the device. Refer to the datasheet for the recommended VOCM range and absolute maximum ratings.
Compliance Information
RoHS compliant per distributor data. Not AEC-Q100 qualified. REACH compliance assumed based on Analog Devices standard compliance.
