LT1993-4 datasheet(10/16 Pages) LINER

Part #	LT1993-4

Description	2.4GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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10 / 16 page

LTC6400-14

10

640014fb

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 capacitors

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 (GND). All

four pins must be connected to same voltage/ground.

–OUT, +OUT (Pins 5, 8): Unﬁltered Outputs. These pins

have series resistors, ROUT 12.5Ω.

–OUTF, +OUTF (Pins 6, 7): Filtered Outputs. These pins

have 50

Ω series resistors and a 2.7pF shunt capacitor.

ENABLE (Pin 11): This pin is a logic input referenced to

VEE. 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

connected to same voltage/ground as pins 4, 9, 12.

13

640014 BD

1

V+

2

VOCM

14

7

15

+OUT

+OUTF

–OUTF

–OUT

+IN

IN+

OUT–

IN–

OUT+

+IN

–IN

5

16

RG

100Ω

ROUT

12.5Ω

RF

500Ω

RG

100Ω

2k

RF

500Ω

6

4

V–

3

V+

12

V–

11

ENABLE

9

V–

10

V+

COMMON

MODE CONTROL

BIAS CONTROL

8

ROUT

12.5Ω

RFILT

50Ω

RFILT

50Ω

CFILT

2.7pF

5.3pF

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