LTC6420-20 PIN FUNCTIONS+INA, –INA, –INB, +INB (Pins 1, 2, 5, 6): Differential V+ A , V+ B (Pins 15, 20, 7, 12 ): Positive Power Supply Inputs of A and B channel respectively. (Normally tied to 3V or 3.3V). Supply pins of A and B channels are internally separate. Bypass each pin with 1000pF and V– (Pins 3, 4, 13, 14, 21): Negative Power Supply. All 0.1μF capacitors as close to the pins as possible. four pins, as well as the exposed back, must be connected to same voltage/ground. –OUTA, +OUTA, –OUTB, +OUTB (Pins 16, 17, 11, 10):ENABLEA Differential Outputs of channels A and B respectively. , ENABLEB (Pins 9, 18): Logic inputs. If low, the amplifi er is enabled. If high, the amplifi er is disabled VOCMA, VOCMB (Pins 19, 8): These pins set the output and placed in a low power shutdown mode, making common mode voltage for the respective channel. They the amplifi er outputs high impedance. These pins are are internally separate. A 0.1μF external bypass capacitor internally separate. These pins should not be left fl oating. is recommended. Exposed Pad (Pin 21): V–. The Exposed Pad must be connected to same voltage/ground as pins 3, 4, 13, 14. BLOCK DIAGRAM V + A VOCMA ENABLEA +OUTA 20 19 18 17 RF R R G 1000Ω OUT 100Ω 12.5Ω +INA 1 – – + + 16 –OUTA RG ROUT 100Ω 12.5Ω 15 V+ A –INA 2 + + – – RF 1000Ω V– 3 14 V– V– 4 R 13 V– F RG R 1000Ω OUT 100Ω 12.5Ω –INB 5 + – 12 V + B R R G OUT 100Ω 12.5Ω +INB 6 – 11 – OUTB + RF 1000Ω 7 8 9 10 640020 BD V+ B VOCMB ENABLEB +OUTB 642020fb 7 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION SELECTOR GUIDE DC ELECTRICAL CHARACTERISTICS AC ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
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