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Volume 8, Issue 2 | YOUR SEMICONDUCTOR SOLUTIONS RESOURCE |
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C o n t e n t s Voltage Feedback Amplifier Offers Low Distortion and Noise on 5 mA Supply Current >> RF Gain Blocks Offer Highest Linearity Over Frequency, Up to 6 GHz >> RF Drivers Offer Superior Performance While Consuming Less Power >> Integrated Single-Supply, Rail-to-Rail Instrumentation Amplifier Packs Performance >> Dual Difference Amplifier Offers Highest System Performance and Channel Density at an Attractive Price >> Low Noise Amplifier Selection Tables >> Low Noise Amplifier Selection Tables, continued >> 20 µA MAX, R-R I/O Zero Input Crossover Distortion Amplifier >> Dual, Digitally Controlled VGA for CMTS Upstream Receivers >> Auto-Zero Amplifiers for Thermopile Sensors in Smart Appliances >> Design Tools for Amplifier Selection, Evaluation, and Circuit Building >> All prices in this bulletin are in USD in quantities greater than 1000 (unless otherwise noted), recommended lowest grade resale, FOB U.S.A.
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Dual, Digitally Controlled Variable Gain Amplifier (VGA) for CMTS Upstream Receivers
The AD8372 is a dual-channel, digitally controlled variable gain amplifier (VGA) developed specifically for CMTS upstream receiver applications. It is flexible and easy to use while offering accuracy, gain control, linearity, and low noise. Each channel is independently controlled by serial 8-bit SPI interfaces providing a readback function for verification of the target gain setting. Serial control reduces the pin count and allows the AD8372 to be packaged in a 5 mm × 5 mm, 32-lead LFCSP.
AD8372 Features Auto-Zero Amplifiers for Thermopile Sensors in Smart Appliances The trend toward smarter applications demands less expensive electronic components and sensors. These sensors and analog front ends are used in a variety of appliance applications from detecting temperature distribution in microwave ovens to sensing the dampness of clothes in dryers. Thermopile sensors incorporate a series of thermoelements that form a sensitive region to produce output voltages in the range of 100 µV to 900 µV. The output signal vs. frequency is fairly constant and is directly proportional to incident radiation. Because measuring these low level thermopile signals imposes great challenges on signal conditioning circuits, a very high precision amplifier, such as an auto-zero amplifier, is recommended. ADI's portfolio of leading auto-zero amplifiers features extremely low offset voltages in the range of tens of microvolts over temperature, as well as very high common-mode rejection to minimize signal distortions.
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