LTC6419 PIN FUNCTIONS –INA, +INA, –INB, +INB (Pins 1, 20, 6, 7): Differential common mode voltage level for the respective amplifier. If Input Pins of Channels A and B Respectively. left floating, an internal resistor divider develops a default +FBA, –FBA, +FBB, –FBB (Pins 2, 19, 5, 8): Feedback voltage of 1.25V with a 5V supply. Pins. These pins are located adjacent to the input pins on +OUTA, –OUTA, +OUTB, –OUTB (Pins 16, 17, 11, 10): the package pinout, however they are internally connected Differential Output Pins of Channels A and B Respectively. to the output pins. They can be easily used for feedback V+A, V+B (Pins 15, 12): Positive Power Supply Pins. Each components connections. amplifier has an independent V+ supply. However, since SHDNA, SHDNB (Pins 3, 4): When these pins are float- both amplifiers share a common substrate, they must ing or directly tied to V+, the respective amplifier is in share the same V– supply. the normal (active) operational mode. When these pins V– (Pins 13, 14, 21): Negative Power Supply Pins. All are connected to V–, the respective amplifier is disabled pins, as well as the exposed pads, must be connected to and draws approximately 100µA of supply current. Each same voltage. amplifier has an independent SHDN pin. Exposed Pad (Pin 21): Tie all four bottom pads to V–. If VOCMA, VOCMB (Pins 18, 9): Output Common Mode Ref- split supplies are used, DO NOT tie the pads to ground. erence Voltage. The voltage on this pin sets the output BLOCK DIAGRAM 20 19 18 17 +INA –FBA VOCMA –OUTA V+A 200k VOCMA 1 16 –INA 50k V+A +OUTA V– 2 + +FBA VOCMA V+A 15 – V+A V– 3 V– 14 SHDNA V– 4 V+B V– 13 SHDNB V– – V+B 12 VOCMB V+B + 5 V+B +FBB V– 200k 6 11 VOCMB –INB +OUTB 50k V– +INB –FBB VOCMB –OUTB 7 8 9 10 6419 BD 6419fa 10 For more information www.linear.com/LTC6419 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Applications Information Typical Applications Typical Applications Related Parts
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