LT6600-20 Linear Technology, LT6600-20 Datasheet - Page 6

• Manufacturer Part Number: LT6600-20
• Description: Very Low Noise Differential Amplifier and 20MHz Lowpass Filter
• Manufacturer: Linear Technology

PI FU CTIO S
BLOCK DIAGRA
LT6600-20
IN
to either or both input pins through identical external
resistors, R
differential outputs is 402 /R
V
for the 2nd Filter Stage. Its value programs the common
mode voltage of the differential output of the filter. Pin 2 is
a high impedance input, which can be driven from an
external voltage reference, or Pin 2 can be tied to Pin 7 on
the PC board. Pin 2 should be bypassed with a 0.01 F
ceramic capacitor unless it is connected to a ground plane.
V
3.3V or 5V supply (Pin 6 grounded) a quality 0.1 F
ceramic bypass capacitor is required from the positive
supply pin (Pin 3) to the negative supply pin (Pin 6). The
bypass should be as close as possible to the IC. For dual
6
OCM
+
–
U
and V
and IN
(Pin 2): Is the DC Common Mode Reference Voltage
–
U
+
(Pins 3, 6): Power Supply Pins. For a single
IN
(Pins 1, 8): Input Pins. Signals can be applied
. The DC gain from differential inputs to the
U
V
V
IN
IN
W
–
+
R
R
IN
IN
IN
.
1
8
IN
IN
+
–
+
V
–
402
402
OCM
OP AMP
–
+
V
V
MID
OCM
7
2
200
200
V
V
–
+
supply applications, bypass Pin 3 to ground and Pin 6 to
ground with a quality 0.1 F ceramic capacitor.
OUT
the filter differential outputs. Each pin can drive a 100
and/or 50pF load.
V
supply, see block diagram. For single supply operation,
the V
ceramic capacitor to Pin 6. For dual supply operation, Pin
7 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. Pin 7 sets the output
common mode voltage of the 1st stage of the filter. It has
a 5.5k
external low impedance voltage source.
11k
11k
MID
+
(Pin 7): The V
MID
V
V
3
and OUT
6
+
–
impedance, and it can be overridden with an
pin should be bypassed with a quality 0.01 F
+ –
V
–
200
200
OCM
PROPRIETARY
FILTER STAGE
+
LOWPASS
–
(Pins 4, 5): Output Pins. Pins 4 and 5 are
OUT
OUT
MID
4
5
–
+
66002 BD
pin is internally biased at mid-
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66002f