LTC6421-20 datasheet(7/16 Pages) LINER

Part #	LTC6421-20

Description	Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC6421-20

7

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PIN FUNCTIONS

+INA, –INA, –INB, +INB (Pins 1, 2, 5, 6): Differential

Inputs of A and B channel respectively.

V– (Pins 3, 4, 13, 14, 21):

Negative Power Supply. All

four pins, as well as the exposed back, must be connected

to same voltage/ground.

ENABLEA, ENABLEB (Pins 9, 18): Logic inputs. If low,

the ampliﬁer is enabled. If high, the ampliﬁer is disabled

and placed in a low-power shutdown mode, making

the ampliﬁer outputs high impedance. These pins are

internally separate. These pins should not be left

ﬂoating.

V+ A , V+ B (Pins 15, 20, 7, 12 ): Positive Power Supply

(Normallytiedto3Vor3.3V).SupplypinsofAandBchannels

are internally separate. Bypass each pin with 1000pF and

0.1μF capacitors as close to the pins as possible.

–OUTA, +OUTA, –OUTB, +OUTB (Pins 16, 17, 11, 10):

Differential Outputs of channels A and B respectively.

VOCMA, VOCMB (Pins 19, 8): These pins set the output

common mode voltage for the respective channel. They

are internally separate. A 0.1μF external bypass capacitor

is recommended.

Exposed Pad (Pin 21): V –. The Exposed Pad must be

connected to same voltage/ground as pins 3, 4, 13, 14.

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