LTC6401-20 Datasheet, PDF (9/16 Pages) Linear Technology – 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF

LTC6401-20
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. 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): Unfiltered Outputs. These pins
have 12.5Ω series resistors.
–OUTF, +OUTF (Pins 6, 7): Filtered Outputs. These pins have
50Ω series resistors and a 1.7pF shunt capacitance.
⎯E⎯N⎯A⎯B⎯L⎯E (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.
BLOCK DIAGRAM
V–
12
ENABLE
V⁺
11
10
V–
9
+IN
13
+IN
14
–IN
15
–IN
16
BIAS CONTROL
R_G
100Ω
R_F
1000Ω
IN+
OUT–
IN–
OUT+
R_G
100Ω
R_F
1000Ω
2k
5.3pF
R_OUT
12.5Ω
R_FILT
50Ω
R_FILT
50Ω
R_OUT
12.5Ω
+OUT
8
+OUTF
7
C_FILT
1.7pF _–OUTF
6
–OUT
5
COMMON
MODE CONTROL
1
V⁺
2
V_OCM
3
V⁺
4 _V–
640120 BD
640120f
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