ADA4940-2 Ultralow Power, Low Distortion ADC Driver
The ADA4940-1 / ADA4940-2 are low noise, low distortion differential amplifiers with very low power consumption. They are an ideal choice for driving low power, high resolution, high performance SAR and sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with resolutions up to 18 bits from dc to 1 MHz on only 1.25 mA of quiescent current. The adjustable level of the output common-mode voltage allows the ADA4940-1 / ADA4940-2 to match the input common-mode voltage of multiple ADCs. The internal common-mode feedback loop provides exceptional output balance, as well as suppression of even-order harmonic distortion products.
With the ADA4940-1 / ADA4940-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier. The ADA4940-1 / ADA4940-2 are fabricated using Analog Devices, Inc., complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 3.9 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4940-1 / ADA4940-2 make them well suited for a variety of data acquisition and signal processing applications.
The ADA4940-1 is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP. The ADA4940-2 is available in a Pb-free, 4 mm × 4 mm, 24-lead LFCSP. The pinout is optimized to facilitate printed circuit board (PCB) layout and minimize distortion. The ADA4940-1 / ADA4940-2 are specified to operate over the −40°C to +125°C temperature range.
Applications
- Low power ADC drivers
- Single-ended-to-differential converters
- Differential buffers
- Line drivers
- Medical Imaging
- Industrial Process Control
- Portable Electronics
Features and BenefitsSmall signal bandwidth: 260 MHzUltralow power 1.25mAExtremely low harmonic distortion- −122 dB THD at 50 kHz
- −96 dB THD at 1 MHz
−122 dB THD at 50 kHz−96 dB THD at 1 MHzLow input voltage noise: 3.9 nV/√Hz0.35 mV maximum offset voltageBalanced outputsSettling time to 0.1%: 34 nsRail-to-rail output: −VS + 0.1 V to +VS − 0.1 VAdjustable output common-mode voltageFlexible power supplies: 3 V to 7 V (LFCSP)Disable pin to reduce power consumption | SPICE ModelsReference Designs |
Data Sheets
Application Notes
User Guides
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| ADA4940-2ACPZ-R2 Production | 24 ld LFCSP 4x4mm (2.5EP) | REEL 250 | -40 to 125C | 3.9 | 3.9 | Y |
| ADA4940-2ACPZ-R7 Production | 24 ld LFCSP 4x4mm (2.5EP) | REEL 1500 | -40 to 125C | 3.15 | 2.59 | Y |
| ADA4940-2ACPZ-RL Production | 24 ld LFCSP 4x4mm (2.5EP) | REEL 5000 | -40 to 125C | 3.15 | 2.59 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-FDA-2CPZ-24 | Evaluation Bare Board for 24 Lead LFCSP | 18.25 | Y |
Reference Materials
