ADA4940-1ACPZ - Ultralow Power Differential ADC Driver | Analog Devices
MPN: ADA4940-1ACPZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.33 | $6.33 |
| 10 | $5.82 | $58.20 |
| 100 | $4.98 | $498.00 |
| 500 | $4.35 | $2,175.00 |
| 1,000 | $3.92 | $3,920.00 |
Drop-in alternatives for ADA4940-1ACPZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4940-1ACPZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4940-1ACPZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4945-1ACPZ
✅ Drop-In✓ In Stock
$2.88 / Unit
View Datasheet →THS4521
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6363HMS8-2#PBF
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →ADA4940-1ACPZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Differential |
| Number of Circuits | 1 |
| Output Type | Differential |
| Slew Rate | 95 V/µs |
| Gain Bandwidth Product | 34 MHz |
| Current - Input Bias | 1.2 µA |
| Voltage - Input Offset | 50 µV |
| Current - Supply | 1.25 mA |
| Voltage - Supply, Single/Dual (±) | 3.3V to 5V, ±1.65V to ±2.5V |
| Operating Temperature | -40°C to +125°C |
| Package / Case | 16-LFCSP-VQ (3x3) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Moisture Sensitivity Level (MSL) | 1 |
| Input Voltage Noise | 3.9 nV/√Hz |
| Distortion at 1 MHz | -100 dBc |
ADA4940-1ACPZ Pin Configuration
| Pin 1 | VOCM — Output common-mode voltage adjust |
| Pin 2 | OUT+ — Positive differential output |
| Pin 3 | V- — Negative supply (or ground) |
| Pin 4 | OUT- — Negative differential output |
| Pin 5 | V+ — Positive supply |
| Pin 6 | PD — Power down (active low) |
| Pin 7 | IN- — Inverting input |
| Pin 8 | IN+ — Non-inverting input |
| Pin 9 | VOCM — Output common-mode voltage adjust (duplicate) |
| Pin 10 | OUT+ — Positive differential output (duplicate) |
| Pin 11 | V- — Negative supply (or ground) (duplicate) |
| Pin 12 | OUT- — Negative differential output (duplicate) |
| Pin 13 | V+ — Positive supply (duplicate) |
| Pin 14 | PD — Power down (active low) (duplicate) |
| Pin 15 | IN- — Inverting input (duplicate) |
| Pin 16 | IN+ — Non-inverting input (duplicate) |
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
ADA4940-1ACPZ is suitable for 6 applications: Portable Medical Devices, Industrial Process Control, Data Acquisition Systems, Battery-Powered Instrumentation, Audio Signal Processing, Test and Measurement.
Portable Medical Devices
The ADA4940-1ACPZ's ultralow power consumption of 1.25 mA and small 3x3 mm LFCSP package make it ideal for battery-powered medical devices such as portable ECG monitors and glucose meters. It drives high-resolution SAR ADCs to accurately digitize biosignals while extending battery life. The low noise of 3.9 nV/√Hz ensures signal fidelity in noisy clinical environments. Its adjustable output common-mode voltage allows direct interface to ADCs with varying input ranges, simplifying design.
Recommended
Industrial Process Control
In industrial automation, the ADA4940-1ACPZ drives ADCs in process control loops, providing accurate conversion of sensor signals. Its wide supply range (3.3V to 5V) and industrial temperature range (-40°C to +125°C) ensure reliable operation in harsh environments. The low distortion (-100 dBc at 1 MHz) maintains signal integrity in high-speed data acquisition systems. The differential output rejects common-mode noise from long sensor cables, improving measurement accuracy.
Recommended
Data Acquisition Systems
The ADA4940-1ACPZ is a key component in data acquisition systems, converting single-ended signals to differential for high-resolution ADCs. Its 34 MHz bandwidth supports sampling rates up to 1 MHz, making it suitable for vibration analysis and transient recording. The low power consumption is advantageous in multi-channel systems where many amplifiers are used. The adjustable common-mode voltage allows optimization of the ADC's dynamic range, ensuring maximum signal-to-noise ratio.
Recommended
Battery-Powered Instrumentation
For handheld test equipment and field instruments, the ADA4940-1ACPZ's ultralow power is critical. It consumes only 1.25 mA, enabling long battery life in portable multimeters and data loggers. The small package saves board space, and the disable pin reduces supply current to 10 µA in standby mode. The low noise and high bandwidth ensure accurate measurements in dynamic signal analysis. The device operates from a single 3.3V supply, simplifying power design.
Recommended
Audio Signal Processing
The ADA4940-1ACPZ can be used in audio applications to drive differential input ADCs, providing high fidelity conversion. Its low distortion and noise ensure transparent audio reproduction. The 34 MHz bandwidth is more than sufficient for audio frequencies, and the low power is beneficial in portable audio devices. The adjustable common-mode voltage allows matching to the ADC's reference, optimizing dynamic range. This makes it suitable for high-end portable audio recorders and professional equipment.
Recommended
Test and Measurement
In test and measurement equipment, the ADA4940-1ACPZ drives ADCs in oscilloscopes, spectrum analyzers, and data loggers. Its high bandwidth and low distortion ensure accurate representation of high-frequency signals. The low power consumption reduces heat generation in densely packed instruments. The differential output improves common-mode rejection, essential for measuring small signals in noisy environments. The industrial temperature range allows use in benchtop and field instruments.
Recommended
Recommended Products Summary
Engineering reference data for ADA4940-1ACPZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4940-1ACPZ-R7 | ADA4940-1ACPZ-RL | ADA4945-1ACPZ | THS4521 | LTC6363 |
|---|---|---|---|---|---|---|
| Package | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Quiescent Current | 1.25 mA | 1.25 mA | 1.25 mA | 1.1 mA | 1.1 mA | 1.1 mA |
| Bandwidth | 34 MHz | 34 MHz | 34 MHz | 35 MHz | 95 MHz | 35 MHz |
| Input Voltage Noise | 3.9 nV/√Hz | 3.9 nV/√Hz | 3.9 nV/√Hz | 3.5 nV/√Hz | 4.6 nV/√Hz | 3.5 nV/√Hz |
| Supply Voltage Range | 3.3V to 5V | 3.3V to 5V | 3.3V to 5V | 3.3V to 5V | 2.5V to 5.5V | 2.8V to 5.25V |
| Distortion at 1 MHz | -100 dBc | -100 dBc | -100 dBc | -105 dBc | -95 dBc | -105 dBc |
| Price (1pc) | $6.33 | $6.33 | $6.33 | $7.50 | $3.50 | $5.00 |
Key Differentiators
- Ultralow power consumption (vs THS4521)
- Low noise and distortion (vs THS4521)
- Pin compatible with ADA4945-1 (vs ADA4945-1ACPZ)
Design Notes
The ADA4940-1ACPZ operates from a single 3.3V to 5V supply or dual supplies. For optimal performance, use a low-noise LDO to supply the amplifier and ADC. Place a 0.1 µF ceramic capacitor close to each supply pin to decouple high-frequency noise. The power-down pin can be used to reduce supply current to 10 µA in standby mode, extending battery life in portable applications.
For best performance, use a solid ground plane and minimize trace lengths to the ADC. Place the ADA4940-1 as close as possible to the ADC input to reduce parasitic capacitance and inductance. Use differential routing for the output traces to maintain balance and reduce common-mode noise. Ensure the feedback resistors are matched to 0.1% tolerance for optimal CMRR.
A common mistake is setting the output common-mode voltage incorrectly. The VOCM pin should be connected to the ADC's reference midpoint to maximize dynamic range. Also, ensure the input common-mode range is not exceeded; the datasheet specifies the input common-mode range as 0.2V to V+ - 0.2V. Failure to observe these limits can cause clipping and distortion.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
