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VCA2619YT Datasheet(PDF) 9 Page - Texas Instruments |
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VCA2619YT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page VCA2619 SBOS276A − AUGUST 2003 − REVISED AUGUST 2003 www.ti.com 9 TYPICAL CHARACTERISTICS (continued) At TA = 25°C and VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2VPP) MGS = 111, and fIN = 5MHz, unless otherwise noted. OVERLOAD DISTORTION vs FREQUENCY Frequency (Hz) 1M 10M 0 −10 −20 −30 −40 −50 −60 0.2V 0.3V 0.5V 1V 55 54 53 52 51 50 49 48 47 46 45 I CC (CHA and CHB) vs TEMPERATURE Temperature ( _C) −40 −30 −20 −10 0 10 203040 5060 7080 90 OVERVIEW The VCA2619 is a dual-channel, VGA consisting of three primary blocks: an Input Buffer, a VCA, and a PGA. All stages are ac coupled, with the coupling into the PGA stage being made variable by placing an external capaci- tor between the CP1 and CP2 pins. This will be discussed further in the PGA section. By using the internal coupling into the PGA, the result is a high-pass filter characteristic with cutoff at approximately 75kHz. The output PGA natu- rally rolls off at around 30MHz, making the usable band- width of the VCA2619 between 75kHz and 30MHz. VCA Buffer Buffer Channel A Input VCA Control PGA Channel A Output Maximum Gain Select MGS Analog Control VCA Channel B Input PGA Channel B Output Figure 1. Simplified Block Diagram of the VCA2619. INPUT BUFFER The input buffer is a unity gain amplifier (gain of +1) with a bandwidth of 100MHz with an input resistance of approx- imately 600k Ω. The input buffer isolates the circuit driving the VCA2619 inputs from the internal VCA block, which would present a varying impedance to the input circuitry. To allow symmetrical operation of the input buffer, the input to the buffer must be ac coupled through an external ca- pacitor. The recommended value of the capacitor is 0.01 µF. It should be noted that if the capacitor value were increased, the power-on time of the VCA2619 would be in- creased. If a decrease in the power-on time is needed, the value can be decreased to no less than 100pF. |
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