LTC6400-26
9
640026fa
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.
V
OCM
(Pin 2): This pin sets the output common mode
voltage. An 0.1μF external bypass capacitor is recom-
mended.
V
–
(Pins 4, 9, 12, 17): Negative Power Supply. All four
pins must be connected to same voltage/ground.
–OUT, +OUT (Pins 5, 8): Unfi ltered Outputs. These pins
have series 12.5Ω resistors R
OUT
.
–OUTF, +OUTF (Pins 6, 7): Filtered Outputs. These pins
have 50Ω series resistors and a 2.7pF shunt capacitor.
ENABLE (Pin 11): This pin is a logic input referenced to
V
EE
. If low, the part is enabled. If high, the part is disabled
and draws very low standby current while the internal op
amp has high output impedance.
+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
connected to same voltage/ground as pins 4, 9, 12.
13
640026 BD
1
V
+
2
V
OCM
14
7
15
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+ OUT–
IN– OUT+
+IN
–IN
–IN
516
R
G
25Ω
R
OUT
12.5Ω
R
F
500Ω
R
G
25Ω
2k
R
F
500Ω
6
4
V
–
3
V
+
12
V
–
11
ENABLE
9
V
–
10
V
+
COMMON
MODE CONTROL
BIAS CONTROL
8
R
OUT
12.5Ω
R
FILT
50Ω
R
FILT
50Ω
C
FILT
2.7pF
5.3pF
