LTC6419

21

6419fa

For more information www.linear.com/LTC6419

TYPICAL APPLICATIONS

I/Q Demodulator Post-Amplifier with DC-Coupling and Level Shifting

6419 TA02

C2

10pF

C1

10pF

RF IN

1900MHz

–10dBm

C3

12pF

R5

620Ω

R6

620Ω

C5

1.3pF

C4

1.3pF

DIFF OUTPUT Z

130Ω

DC LEVEL

1.25V

DC LEVEL

3.9V

DC LEVEL

3.4V

GAIN: 12.3dB

GAIN: 1.1dB

R3

75Ω

R4

75Ω

R1

75Ω

R2

75Ω

–OUT

+OUT

IDENTICAL Q CHANNEL

(CONNECTS TO LTC6419 CHANNEL B)

5V

5pF

65Ω

5pF

65Ω

–

+

+

–

5V

LTC6419

CHANNEL A

1.25V

5V

I

5V

5pF

65Ω

5pF

65Ω

5V

Q

5V

LT5575

LO

1920MHz

0dBm

–8.9dBm

3.4dBm

Single-Ended to Differential Conversion Using LTC6419 and 50MHz Lowpass Filter (Only One Channel Shown)

LTM9011-14

(14-BIT, 125Msps

OCTAL ADCs)

F3

F1

F2

C1

C2

B3

B1

B2

+

–

+

–

+

–

+

–

+

–

G2

G1

N1

N2

H7

H8

G8

G7

E7

E8

P5 P6

B6

C5

1.8V

1.8V

7.5pF

82pF

270nH

220nH

3.3V

270nH

220nH

82pF

100pF

150Ω

474Ω

50Ω

50Ω

–OUT

+OUT

+IN

–IN

474Ω

100Ω

100Ω

100Ω

100Ω

66.5Ω

66.5Ω

0.1µF

0.8pF

0.8pF

68pF

68pF

6419 TA03

–

+

150Ω

SHDN

GND

INPUT

49.9Ω

1/2 LTC6419