ADA4940-2ACPZ-RL7 - Ultralow Power ADC Driver | Analog Devices
MPN: ADA4940-2ACPZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.09 | $7.09 |
| 10 | $6.38 | $63.80 |
| 100 | $5.67 | $567.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.78 | $4,780.00 |
Drop-in alternatives for ADA4940-2ACPZ-RL7 — 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:
ADA4940-2ACPZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4940-2ACPZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4950-2YCPZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
THS4521
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6362
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4940-2ACPZ-RL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Supply Voltage Range | 3.3 V to 7 V (single), ±1.65 V to ±3.5 V (dual) |
| Quiescent Current per Amplifier | 1.25 mA |
| Input Voltage Noise | 3.9 nV/√Hz |
| SFDR | -110 dBc at 100 kHz |
| Bandwidth (-3 dB) | 26 MHz |
| Slew Rate | 50 V/µs |
| Output Common-Mode Range | Rail-to-rail |
| Input Offset Voltage | 50 µV (typical) |
| Input Bias Current | 1.5 µA |
| Output Current | 40 mA |
| Operating Temperature Range | -40°C to +125°C |
| Package | 24-Lead LFCSP (4mm x 4mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADA4940-2ACPZ-RL7 Pin Configuration
| Pin 1 | OUT+ — Positive differential output |
| Pin 2 | VOCM — Output common-mode voltage set |
| Pin 3 | VEE — Negative supply (or ground) |
| Pin 4 | IN- — Inverting input |
| Pin 5 | IN+ — Non-inverting input |
| Pin 6 | VCC — Positive supply |
| Pin 7 | PD — Power-down (active low) |
| Pin 8 | OUT- — Negative differential output |
| Pin 9 | NC — No connect |
| Pin 10 | NC — No connect |
| Pin 11 | NC — No connect |
| Pin 12 | NC — No connect |
| Pin 13 | NC — No connect |
| Pin 14 | NC — No connect |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
| Pin 17 | NC — No connect |
| Pin 18 | NC — No connect |
| Pin 19 | NC — No connect |
| Pin 20 | NC — No connect |
| Pin 21 | NC — No connect |
| Pin 22 | NC — No connect |
| Pin 23 | NC — No connect |
| Pin 24 | NC — No connect |
| Pin EP | Exposed Pad — Thermal pad, connect to ground |
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
ADA4940-2ACPZ-RL7 is suitable for 6 applications: SAR ADC Driver, Sigma-Delta ADC Driver, Portable Instrumentation, Medical Imaging, Communications Receivers, Test and Measurement.
SAR ADC Driver
The ADA4940-2ACPZ-RL7 is optimized to drive low-power, high-resolution SAR ADCs such as the AD7985 and AD7768. Its ultralow quiescent current of 1.25 mA per channel preserves battery life in portable data acquisition systems. The low noise (3.9 nV/√Hz) and low distortion (-110 dBc SFDR) ensure the ADC achieves its specified SNR and THD. The adjustable output common-mode voltage allows direct interface to the ADC's input range, simplifying the design. With a bandwidth of 26 MHz, it supports sampling rates up to several MSPS without introducing significant settling errors.
Recommended
Sigma-Delta ADC Driver
For high-resolution sigma-delta ADCs like the AD7768, the ADA4940-2ACPZ-RL7 provides a clean differential signal with low noise and distortion. Its low power consumption is critical in multi-channel systems where many amplifiers are used. The device's rail-to-rail output swing maximizes the ADC's dynamic range, and the VOCM pin allows precise level shifting to match the ADC's common-mode voltage. The wide bandwidth ensures minimal phase shift at the ADC's modulation frequency, preserving signal integrity.
Recommended
Portable Instrumentation
In battery-powered instruments such as handheld multimeters and portable medical devices, the ADA4940-2ACPZ-RL7's ultralow power consumption extends battery life. Its small 4mm x 4mm LFCSP package saves board space, and the low noise ensures accurate measurement of small sensor signals. The device operates from a single 3.3V supply, simplifying power design. The disable pin allows power-down between measurements, reducing average current to microamps.
Recommended
Medical Imaging
The ADA4940-2ACPZ-RL7 is suitable for medical imaging systems such as ultrasound and MRI, where low noise and low distortion are paramount. Its differential output rejects common-mode interference from the imaging environment. The low power dissipation reduces heat in dense arrays, improving system reliability. The wide bandwidth supports high-speed signal processing, and the small package allows high channel density. The device's performance is consistent over the -40°C to +125°C range, ensuring stable operation in clinical settings.
Recommended
Communications Receivers
In communications receivers, the ADA4940-2ACPZ-RL7 drives ADCs that digitize IF or baseband signals. Its low distortion (-110 dBc SFDR) ensures that adjacent channel interference is not generated, maintaining receiver sensitivity. The low power consumption is beneficial in multi-channel base stations. The adjustable common-mode voltage allows interface to ADCs with different input ranges. The device's bandwidth of 26 MHz is sufficient for most IF frequencies, and its differential output reduces even-order harmonics.
Recommended
Test and Measurement
The ADA4940-2ACPZ-RL7 is used in test equipment such as oscilloscopes and spectrum analyzers to condition signals before ADC conversion. Its low noise and high bandwidth preserve signal fidelity, and the differential output improves common-mode rejection. The low power consumption is advantageous in portable test instruments. The device's small package allows compact designs, and its wide supply range accommodates various system rails. The disable pin enables power management in battery-operated equipment.
Recommended
Recommended Products Summary
Engineering reference data for ADA4940-2ACPZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4940-2ACPZ-R7 | ADA4940-2ACPZ-RL | ADA4940-1ACPZ-R7 | ADA4950-2YCPZ-RL | THS4521 | LTC6362 |
|---|---|---|---|---|---|---|---|
| Package | 24-Lead LFCSP (4x4) | 24-Lead LFCSP (4x4) | 24-Lead LFCSP (4x4) | 16-Lead LFCSP (3x3) | 24-Lead LFCSP (4x4) | 24-Lead LFCSP (4x4) | 24-Lead LFCSP (4x4) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 1 | 2 | 1 | 2 |
| Quiescent Current per Channel | 1.25 mA | 1.25 mA | 1.25 mA | 1.25 mA | 5 mA | 1.1 mA | 1.9 mA |
| Input Voltage Noise | 3.9 nV/√Hz | 3.9 nV/√Hz | 3.9 nV/√Hz | 3.9 nV/√Hz | 2.2 nV/√Hz | 4.6 nV/√Hz | 2.5 nV/√Hz |
| Bandwidth (-3 dB) | 26 MHz | 26 MHz | 26 MHz | 26 MHz | 500 MHz | 95 MHz | 180 MHz |
| SFDR | -110 dBc at 100 kHz | -110 dBc at 100 kHz | -110 dBc at 100 kHz | -110 dBc at 100 kHz | -90 dBc at 10 MHz | -100 dBc at 1 MHz | -120 dBc at 100 kHz |
| Supply Voltage Range | 3.3V to 7V | 3.3V to 7V | 3.3V to 7V | 3.3V to 7V | 3V to 5.25V | 2.5V to 5.5V | 2.8V to 5.25V |
Key Differentiators
- Ultralow quiescent current of 1.25 mA per channel (vs ADA4950-2YCPZ-RL)
- Lower noise than THS4521 (vs THS4521)
- Pin-compatible with ADA4950-2 in same package (vs ADA4950-2YCPZ-RL)
Design Notes
The ADA4940-2ACPZ-RL7 operates from a single 3.3V to 7V supply or dual supplies. For optimal performance, use low-ESR ceramic capacitors (0.1 µF and 10 µF) placed close to the VCC and VEE pins. The exposed pad should be connected to a low-impedance ground plane to aid thermal dissipation. In single-supply operation, ensure the input common-mode range is not violated by setting the VOCM appropriately.
For best distortion performance, keep the feedback resistor values between 200 Ω and 1 kΩ. Minimize parasitic capacitance at the summing nodes by placing resistors close to the inputs and using short traces. Use a solid ground plane under the device and avoid routing high-speed digital signals near the analog inputs. The exposed pad should be soldered to the PCB for thermal and electrical connection.
Do not leave the PD (power-down) pin floating; tie it high for normal operation or low to disable. The VOCM pin must be driven by a low-impedance source, such as a reference buffer, to avoid common-mode errors. Ensure the output common-mode voltage is within the ADC's input range to prevent clipping. Also, verify that the input signal does not exceed the absolute maximum ratings, as the device is not internally protected against overvoltage.
Compliance Information
RoHS compliant and lead-free per Analog Devices product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
