LT6600CS8-5-PBF LINER [Linear Technology], LT6600CS8-5-PBF Datasheet - Page 6

• Manufacturer Part Number: LT6600CS8-5-PBF
• Description: Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
LT6600-5
IN
plied to either or both input pins through identical external
resistors, R
differential outputs is 806Ω/R
V
for the 2nd Filter Stage. Its value programs the common
mode voltage of the differential output of the fi lter. 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 0.01μF ceramic
capacitor unless it is connected to a ground plane.
V
3.3V or 5V supply (Pin 6 grounded) a quality 0.1μF ceramic
bypass capacitor is required from the positive supply pin
(Pin 3) to the negative supply pin (Pin 6). The bypass
BLOCK DIAGRAM
6
OCM
+
–
and V
and IN
(Pin 2): Is the DC Common Mode Reference Voltage
–
+
(Pins 3, 6): Power Supply Pins. For a single
IN
(Pins 1, 8): Input Pins. Signals can be ap-
. The DC gain from differential inputs to the
V
V
IN
IN
–
+
IN
R
R
.
IN
IN
8
1
IN
IN
+
–
+
V
–
806Ω
806Ω
OCM
OP AMP
–
+
V
V
MID
OCM
7
2
should be as close as possible to the IC. For dual supply
applications, bypass Pin 3 to ground and Pin 6 to ground
with a quality 0.1μF ceramic capacitor.
OUT
the fi lter differential outputs. Each pin can drive a 100Ω
and/or 50pF load to AC ground.
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 fi lter. It has
a 5.5kΩ impedance, and it can be overridden with an
external low impedance voltage source.
400Ω
400Ω
V
V
MID
–
+
11k
11k
+
MID
(Pin 7): The V
and OUT
V
V
3
6
–
+
pin should be bypassed with a quality 0.01μF
+ –
V
–
400Ω
400Ω
OCM
PROPRIETARY
FILTER STAGE
–
+
LOWPASS
(Pins 4, 5): Output Pins. Pins 4 and 5 are
MID
OUT
OUT
4
5
pin is internally biased at mid-
–
+
66005 BD
66005fa