ADA4938-1: Ultralow Distortion Differential ADC Driver (Single)
The ADA4938 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.
Full differential and single-ended-to-differential gain configurations are easily realized with the ADA4938. A simple external feedback network of four resistors determines the closed-loop gain of the amplifier.
The ADA4938 is fabricated using the Analog Devices, Inc. proprietary third-generation, high voltage XFCB process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.6 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4938 make it well suited for a wide variety of data acquisition and signal processing applications.
The ADA4938-1 (single amplifier) is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP. The ADA4938-2 (dual amplifier) is available in a Pb-free, 4 mm × 4 mm, 24-lead LFCSP. The pinouts have been optimized to facilitate layout and minimize distortion. The parts are specified to operate over the extended industrial temperature range of -40°C to +85°C.
ADA4938-1 应用
- ADC drivers
- Single-ended-to-differential converters
- IF and baseband gain blocks
- Differential buffers
- Line drivers
ADA4938-1 特点
- Extremely low harmonic distortion
-106 dBc HD2 @ 10 MHz
-82 dBc HD2 @ 50 MHz
-109 dBc HD3 @ 10 MHz
-82 dBc HD3 @ 50 MHz - High speed
-3 dB bandwidth of 1000 MHz, G = +1
Slew rate: 4700 V/μs
0.1 dB gain flatness to 150 MHz
Fast overdrive recovery of 4 ns - Low input voltage noise: 2.6 nV/√Hz
- 1 mV typical offset voltage
- Externally adjustable gain
- Differential-to-differential or single-ended-to-differential operation
- Adjustable output common-mode voltage
- Wide supply voltage range: +5 V to ±5 V
- Single or dual amplifier configuration available
ADA4938-1 功能框图
ADA4938-1 功能框图
ADA4938-1 技术指标
| -3 dB BW (MHz) | 1000MHz | Distortion (2nd) (dBc) | -82dBc |
| Minimum Gain (Acl) | 1 | Distortion (3rd) (dBc) | -82dBc |
| Slew Rate (V/us) | 4700V/us | Package | 16-Lead LFCSP,24-Lead LFCSP |
| Supply Current | 40mA |
ADA4938-1 订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADA4938-1ACPZ-R2 | 量产 | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | 工业 |
| ADA4938-1ACPZ-R7 | 量产 | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | 工业 |
| ADA4938-1ACPZ-RL | 量产 | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | 工业 |
EVAL-ADDIFFAMP: Differential Driver Evaluation Boards
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| EVAL-ADDIFAMP-1CPZ | 量产 | 评估板 | 商业 | |
| EVAL-ADDIFAMP-2CPZ | 量产 | 评估板 | 商业 | |
| EVAL-ADDIFFAMP-1RZ | 量产 | 评估板 | 商业 | |
| EVAL-ADDIFFAMP-CPZ | 量产 | 评估板 | 商业 | |
| EVAL-ADDIFFAMP-RMZ | 量产 | 评估板 | 商业 |
EVAL-ADDIFFRX: Differential Receiver Evaluation Boards
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| EVAL-ADDIFFRX-1RMZ | 量产 | 评估板 | 商业 | |
| EVAL-ADDIFFRX-1RZ | 量产 | 评估板 | 商业 |