LTC6401-20
9
640120f
BLOCK DIAGRAM
PIN FUNCTIONS
V+ (Pins 1, 3, 10): Positive Power Supply (Normally tied
to 3V or 3.3V). All three pins must be tied to the same
voltage. Bypass each pin with 1000pF and 0.1μF capaci-
tors as close to the pins as possible.
VOCM (Pin 2): This pin sets the output common mode
voltage. A 0.1μF external bypass capacitor is recom-
mended.
V– (Pins 4, 9, 12, 17):
Negative Power Supply. All four
pins must be connected to the same voltage/ground.
–OUT, +OUT (Pins 5, 8): Unltered Outputs. These pins
have 12.5Ω series resistors.
–OUTF,+OUTF(Pins6,7):FilteredOutputs.Thesepinshave
50Ω series resistors and a 1.7pF shunt capacitance.
ENABLE (Pin 11): This pin is a logic input referenced to
V–. If low, the part is enabled. If high, the part is disabled
and draws approximately 1mA supply current.
+IN (Pins 13, 14): Positive Input. Pins 13 and 14 are
internally shorted together.
–IN (Pins 15, 16): Negative Input. Pins 15 and 16 are
internally shorted together.
Exposed Pad (Pin 17): V–. The Exposed Pad must be con-
nected to the same voltage/ground as pins 4, 9, 12.
13
640120 BD
1
V+
2
VOCM
14
7
15
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
5
16
RG
100
Ω
ROUT
12.5
Ω
RF
1000
Ω
RG
100
Ω
2k
RF
1000
Ω
6
4
V–
3
V+
12
V–
11
ENABLE
9
V–
10
V+
COMMON
MODE CONTROL
BIAS CONTROL
8
ROUT
12.5
Ω
RFILT
50
Ω
RFILT
50
Ω
CFILT
1.7pF
5.3pF