LT6600-2.5_09 Datasheet, PDF (7/16 Pages) Linear Technology – Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter

LT6600-2.5
PIN FUNCTIONS ^(DFN/SO)
IN^– and IN⁺ (Pins 1, 12/Pins 1, 8): Input Pins. Signals can
be applied to either or both input pins through identical
external resistors, R_IN. The DC gain from differential inputs
to the differential outputs is 1580Ω/R_IN.
NC (Pins 2, 5, 11/NA): No Connection
V_OCM (Pin 3/Pin 2): DC Common Mode Reference Voltage-
for the 2nd Filter Stage. Its value programs the common
mode voltage of the differential output of the filter. This
is a high impedance input, which can be driven from an
external voltage reference, or it can be tied to V_MID on the
PC board. V_OCM should be bypassed with a 0.01μF ceramic
capacitor unless it is connected to a ground plane.
V⁺ and V^– (Pins 4, 8, 9/Pins 3, 6): Power Supply Pins. For
a single 3.3V or 5V supply (V^– grounded) a quality 0.1μF
ceramic bypass capacitor is required from the positive
supply pin (V⁺) to the negative supply pin (V^–). The bypass
should be as close as possible to the IC. For dual supply
applications, bypass V⁺ to ground and V^– to ground with
a quality 0.1μF ceramic capacitor.
OUT⁺ and OUT^– (Pins 6, 7/Pins 4, 5): Output Pins. These
are the filter differential outputs. Each pin can drive a 100Ω
and/or 50pF load to AC ground.
V_MID (Pin 10/Pin 7): The V_MID pin is internally biased at
mid-supply, see Block Diagram. For single supply op-
eration, the V_MID pin should be bypassed with a quality
0.01μF ceramic capacitor to V^–. For dual supply operation,
V_MID can be bypassed or connected to a high quality DC
ground. A ground plane should be used. A poor ground
will increase noise and distortion. V_MID sets the output
common mode voltage of the 1st stage of the filter. It has
a 5.5kΩ impedance, and it can be overridden with an
external low impedance voltage source.
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