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CA3256 Scheda tecnica(PDF) 6 Page - Harris Corporation |
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CA3256 Scheda tecnica(HTML) 6 Page - Harris Corporation |
6 / 11 page 8-6 buffer amplifier. The T-switch, together with the input impedance of the buffer, is typically 10k Ω, and has an inser- tion loss of approximately 0.8dB. The T-switch was designed to handle up to 3VP-P input signal with low distortion. The T-switches of the CA3256 conform to a break-before-make format; hence, shorting to ground is eliminated. The amplifier is programmable for gain and, typically, can provide a gain of 1 into a 75 Ω load or a gain of 5 into a 1kΩ load. The maximum output signal swing with linearity is greater than 5VP-P for (V+ to V-) greater than or equal to 12V, while the maximum output current is approximately 20mA. The amplifier has base-current compensation to reduce offset and a temperature compensated 5V zener ref- erenced bias. Other features include LED-selector indicators for channels 1 through 4. The fifth channel is independently selectable for use as a separate input or output in parallel with any on channel, and may be used as a monitor, or for pass-through, signal summing, or parallel distribution. In the application, the user has the option to specify V- = -5V for the switch and a ground reference for the amplifier input and output. Alternatively, the CA3256 may be used with a single +12V supply. The logic select for channels 1 through 4 is controlled by the A, B and Inhibit lines with ground to V+ logic switching. The logic threshold is approximately (V+ - V-)/2 referenced to ground. DC coupling may also be used at the output (when V- is returned to a -5V supply). For the circuit of Figure 3, AC coupling is used at the output and input. The switching bias arrangement shown provides for stable bias across each switch when in the off position to minimize transients when the input is switched. Typical Applications TG-1 10K V- +5V BIAS 8 -5V V- +7V TO +12V V+ 100K 100K AB ENABLE CHANNEL 1-4 4.7K 4.7K 4.7K GND 1K 10K LED INDICATOR CHANNEL 4 LED INDICATOR CHANNEL 3 LED INDICATOR CHANNEL 2 LED INDICATOR CHANNEL 1 AMPLIFIER TO CABLE OUTPUT OUTPUT AMP 14 5 CHANNEL 1 INPUT CHANNEL 5 INPUT/ OUTPUT 2 OF 5 INPUTS SHOWN TG-2 TG-3 VLED 75 Ω 4.7K C SELECT CHANNEL 5 WHERE AMPLIFIER GAIN: RF = 9kΩ i.e., FOR AV = 1.8 REG 5 14 + 9 15 1 - RF 75 Ω 12 2 3 17 1 3 TG-4 LLC ENABLE AND CHAN 1-4 SELECT 4 TG-5 13 6 16 18 7 4 2 A V 1 R F 1K + 10K ---------------------- + x0.9 = 11 10 SELECT CHANNEL 1-4 100K OUT FIGURE 2. TYPICAL APPLICATION WITH DIRECT-COUPLED OUTPUT AND V- = -5V (DIP PINOUT) CA3256 |
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Descrizione simile - CA3256 |
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