Datasheet LTC6401-8 (Analog Devices) - 8

LTC6401-8
PIN FUNCTIONS V+ (Pins 1, 3, 10):
Positive Power Supply (Normally tied
–OUTF, +OUTF (Pins 6, 7):
Filtered Outputs. These pins to 3V or 3.3V). All three pins must be tied to the same have 50Ω series resistors and a 2.7pF shunt capacitor. voltage. Bypass each pin with 1000pF and 0.1μF capaci- ⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E (Pin 11):
This pin is a logic input referenced to tors as close to the pins as possible. VEE. If low, the part is enabled. If high, the part is disabled
VOCM (Pin 2):
This pin sets the output common mode and draws very low standby current while the internal op voltage. A 0.1μF external bypass capacitor is recom- amp has high output impedance. mended.
+IN (Pins 13, 14):
Positive Input. Pins 13 and 14 are
V– (Pins 4, 9, 12, 17):
Negative Power Supply. All four internally shorted together. pins must be connected to same voltage/ground.
–IN (Pins 15, 16):
Negative Input. Pins 15 and 16 are
–OUT, +OUT (Pins 5, 8):
Unfi ltered Outputs. These pins internally shorted together. have series resistors, ROUT 12.5Ω.
Exposed Pad (Pin 17):
V–. The Exposed Pad must be connected to same voltage/ground as pins 4, 9, 12.
BLOCK DIAGRAM
V– ENABLE V+ V– 12 11 10 9 BIAS CONTROL RG RF ROUT +IN +OUT 200Ω 500Ω 12.5Ω 13 8 RFILT +OUTF 50Ω +IN IN+ OUT– 7 14 C R FILT FILT –IN 2.7pF –OUTF 50Ω 15 6 IN– OUT+ RG RF ROUT –IN –OUT 200Ω 500Ω 12.5Ω 16 5 2k COMMON MODE CONTROL 5.3pF 64018 BD 1 2 3 4 V+ VOCM V+ V– 64018f 8