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
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.
Features and Benefits
| AmplifiersAerospace and Defense
SPICE ModelsReference Designs |
| Document | note |
| ADA4940-1/ADA4940-2: Ultralow Power, Low Distortion, Fully Differential ADC Drivers Data Sheet (Rev. D) | PDF 1.04 M |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| ADA4940-1ACPZ-R2 Production | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | REEL 250 | -40 to 125C | 2.36 | 2.36 | Y |
| ADA4940-1ACPZ-R7 Production | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | REEL 1500 | -40 to 125C | 1.91 | 1.59 | Y |
| ADA4940-1ACPZ-RL Production | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | REEL 5000 | -40 to 125C | 1.91 | 1.59 | Y |
| ADA4940-1ARZ Production | 8 ld SOIC | OTH 98 | -40 to 125C | 1.91 | 1.59 | Y |
| ADA4940-1ARZ-R7 Production | 8 ld SOIC | REEL 1000 | -40 to 125C | 0 | 1.59 | Y |
| ADA4940-1ARZ-RL Production | 8 ld SOIC | REEL 2500 | -40 to 125C | 0 | 1.59 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-FDA-1CPZ-16 | Evaluation Bare Board for 16 Lead LFCSP | 18.25 | Y |
| EVAL-FDA-1RMZ-8 | Evaluation Bare Board for 8 Lead MSOP | 18.25 | Y |
| EVAL-FDA-1RZ-8 | Evaluation Bare Board for 8 Lead SOIC | 18.25 | Y |
| FDA-FILTER-CPZ | Evaluation Board Filter for LFCSP | 18.25 | Y |
