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LTC6405CUD-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC6405CUD-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  LTC6405 11 6405fa PIN FUNCTIONS VOCM (Pin 2/Pin 4): Output Common Mode Reference Voltage. The voltage on VOCM sets the output common mode voltage level (which is defined as the average of the voltages on the +OUT and –OUT pins). The VOCM voltage is internally set by a resistive divider between the supplies, developing a default voltage potential of 2.5V with a 5V supply. The VOCM pin can be over-driven by an external voltage capable of driving the 19kΩ Thevenin equivalent impedance presented by the pin. The VOCM pin should be bypassed with a high quality ceramic bypass capacitor of at least 0.01μF, to minimize common mode noise from being converted to differential noise by impedance mismatches both externally and internally to the IC. V+ (Pin 3/Pins 2, 10, 11): V– (Pin 6/Pins 3, 9, 12): Power Supply Pins. It is critical that close attention be paid to supply bypassing. For single supply applications, it is recommended that a high quality 0.1μF surface mount ceramic bypass capacitor be placed between V+ and V– with direct short connections. In addition, V– should be tied directly to a low impedance ground plane with minimal routing. For dual (split) power supplies, it is recommended that additional high quality, 0.1μF ceramic capacitors are used to bypass V+ to ground and V– to ground, again with minimal routing. For driving large loads (<200Ω), additional bypass capacitance may be needed for optimal performance. Keep in mind that small geometry (e.g., 0603 or smaller) surface mount ceramic capacitors have a much higher self resonant frequency than do leaded capacitors, and perform best in high speed applications. +OUT, –OUT (Pins 4, 5/Pins 7, 14): Unfiltered Output Pins. Besides driving the feedback network, each pin can drive an additional 50Ω to ground with typical short circuit current limiting of ±60mA. Each amplifier output is designed to drive a load capacitance of 5pF. Larger capacitive loads should be decoupled with at least 15Ω resistors from each output. VTIP (Pin 5) QFN Only: This pin can normally be left float- ing. It determines which pair of input transistors (NPN or PNP or both) is sensing the input signal. The VTIP pin is set by an internal resistive divider between the supplies, developing a default 2.8V voltage with a 5V supply. VTIP has a Thevenin equivalent resistance of approximately 17k and can be over-driven by an external voltage. The VTIP pin should be bypassed with a high quality ceramic bypass capacitor of at least 0.01μF. See the Applications Information section for more details. SHDN (Pin 7/Pin 1): When SHDN is floating or directly tied to V+, the LTC6405 is in the normal (active) operat- ing mode. When the SHDN pin is connected to V–, the LTC6405 enters into a low power shutdown state with Hi-Z outputs. +IN, –IN (Pins 8, 1/Pins 15, 6): Noninverting and Inverting Input Pins of the Amplifier, Respectively. For best perfor- mance, it is highly recommended that stray capacitance be kept to an absolute minimum by keeping printed circuit connections as short as possible. +OUTF, –OUTF (Pins 8, 13) QFN Only: Filtered Output Pins. These pins have a series RC network (R = 50Ω, C = 3.75pF) connected between the filtered and unfiltered outputs. See the Applications Information section for more details. NC (Pin 16) QFN Only: No Connection. This pin is not connected internally. Exposed Pad (Pin 9/Pin 17): Tie the bottom pad to V–. If split supplies are used, DO NOT tie the pad to ground. (MSOP/QFN) |
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