AD8338ACPZ-R7

AD8338 is a variable gain amplifier (VGA) for applications that require a fully differential signal path, low power, low noise, and a well-defined gain over frequency. Although the input is differential, the device can also be driven with a single-ended source if required. The basic gain function is linear-in-dB and is controlled by the voltage applied to pin GAIN. The nominal gain range can be shifted up or down via direct access to pin INPD and pin INMD, the current inputs of the VGA. This includes additional circuit blocks to enable input offset correction and automatic gain control (AGC). DC offset voltages are removed by the offset correction circuit, which behaves like a high-pass filter whose corner is set with an external capacitor. The AGC function varies the gain of to maintain a constant RMS output voltage. Application includes front end for inductive telemetry systems, ultrasonic signal receivers, signal compression for driving an ADC, AGC amplifiers.

• Gain range is 80dB (standard configuration using the INPR and INMR inputs, VBAT=3.0V, TA=25°C)
• 3mA supply current at gain of 40dB, typical -3dB bandwidth is 18MHz (VBAT=3.0V, TA=25°C)
• Input voltage range is 3V p-p (VBAT=3.0V, TA=25°C), peak slew rate is 50V/µs (VGAIN=0.6V)
• Supply range from 3.0V to 5.0V, low noise is 4.5nV/√Hz at 80dB gain
• Fully differential signal path, offset correction (offset null) feature, internal 1.5V reference
• Accuracy is 2% (VBAT=3.0V, TA=25°C, CL= 2pF on OUTP and OUTM, RL=∞)
• Automatic gain control feature, wide gain range for high dynamic range signals
• Typical output current is 5mA (VBAT=3.0V, TA=25°C), typical output voltage is 1.5V (TA=25°C)
• 16-lead LFCSP package
• Temperature rating range from -40°C to +85°C

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