ca3256 Intersil Corporation, ca3256 Datasheet
ca3256
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ca3256 Summary of contents
Page 1
... Channel 5 may be used as a monitor output for data or signal information on channels The transmission gate switches shown in the block diagram of the CA3256 are configured in a “T” design to minimize feedthrough. When the switch is off, the shunt or center of the “T” is grounded. ...
Page 2
... CONV. WITH ENABLE CONTROL Switch Control Logic CHANNEL NUMBER (1-4) (Note) 5 None NOTE: For Maximum Video Bandwidth, Use Single Channel Selections CA3256 V+ IN/OUT BIAS REG OUT IN OUT SW ...
Page 3
... CAUTION: Connect the V- power supply voltage before or during the V+ turn-on. NOTES: 2. Threshold value is referenced to GND restricted by the equation CA3256 Thermal Information Thermal Resistance (Typical, Note 1) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-P Maximum Junction Temperature (Die 175 Maximum Junction Temperature (Plastic Package 150 Maximum Storage Temperature Range ...
Page 4
... Feedback O Switch Closed V+ = +7V -5V Closed Loop Gain 3V 0V NOTES +7V. OUT +3V. OUT 6. DIP Pinout. CA3256 12V 12V GND, Pin 4 = GND, Feedback Switch Closed, V LED CHANNEL SWITCH CONTROL PIN 3 PIN 13 PIN 16 PIN 18 PIN ...
Page 5
... CA3256 Video-Switch Amplifier The Block Diagram shows the functional diagram of the CA3256, which consists of five MOS channels, each com- prising a three-element T-switch. The output of the five switches is made common and fed into the input of a bipolar ...
Page 6
... 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 ...
Page 7
... INPUTS SHOWN 3 CHAN 1-4 2.2 F CHANNEL 5 13 INPUT/ OUTPUT 75 ENABLE 6 CHANNEL 1-4 4. OUT FIGURE 3. TYPICAL APPLICATION WITH AC-COUPLED INPUT AND OUTPUT, AND V- = GND (DIP PINOUT) CA3256 V- V+ +12 TO +18V 0.047 F 0.047 F 2 +5V BIAS REG 10K + 10K TG-1 1 TG ...
Page 8
... COMPENSATION CAPACITOR, C SEE FIGURE 200mV OUT 0.01 0.1 1 FREQUENCY (MHz) FIGURE 4C. OPEN LOOP RESPONSE WITH NO FEEDBACK, SEE FIGURE 4D FIGURE 4. FREQUENCY RESPONSE OF AC COUPLED CIRCUIT OF FIGURE 3 CA3256 AMPLIFIER TG 100 10 FIGURE 4B. TEST CIRCUIT FOR FIGURE 4A , AND R , COMP P-P A ...
Page 9
... FIXED BY THE V+ AND V- RANGE. (DIP PINOUT) 2V P-P 10V FIGURE 6A. GATED OUTPUT FOR V+ = +12V ENABLE = HIGH, CONTROL LOW, CONTROL A = 10V PULSE. THE BURST ~ OUTPUT IS DELAYED 400ns s/DIV. FIGURE 6B. STANDARD NTS COLOR BAR FIGURE 6. PERFORMANCE OF CIRCUIT IN FIGURE 5 CA3256 -5V 10K +5V BIAS REG ...
Page 10
... BW = 40MHz (1.2X GAIN PEAK AT 25MHz 200mV OUT P-P FIGURE 7C FEEDBACK 9 150 FIGURE 7E. 6pF 280 FIGURE 7G. FIGURE 7. OTHER TABULATED RESULTS FOR VARIATIONS OF LOAD AND FEEDBACK (V+ = +12V) CA3256 18MHz OUT P OUT NOTE: 470 added to increase source drive current. V OUT V OUT1 ...
Page 11
... In this respect, the CA3256 IC switch and amplifier discussed provide an excellent choice for a cost-effective high-performance video-switch amplifier, by taking advantage of the complementary features of both high-speed CMOS and bipolar integrated circuits ...