LT5572 Просмотр технического описания (PDF) - Linear Technology

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производитель

LT5572

1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator

Linear Technology 

APPLICATIO S I FOR ATIO

RF

VCC = 5V

LT5572

C

BALUN

LOMI

FROM

Q-CHANNEL

LOPI

LT5572

BBPI

VCM = 0.5V

BBMI

1.8pF

1.8pF

GND

5572 F01

Figure 1. Simplified Circuit Schematic of the LT5572 (Only I Channel is Drawn)

50Ω

–+ 1VDC

GENERATOR

0.5VDC

50Ω

50Ω

0.5005VDC

–+ 1VDC

50Ω

EXTERNAL

GENERATOR

LOAD

LT5572

20µADC

5572 F02

Figure 2. DC Voltage Levels for a Generator Programmed at 0.5VDC for a 50Ω Load Without and With the LT5572 as a Load

MAX RF

+6.2dBm

VCC

5V

LT5572

C

BALUN

LOMI

FROM

Q-CHANNEL

LOPI

0mA TO 20mA

DAC

0mA TO 20mA

L1A

R1A

100Ω

C1

R1B

100Ω L1B

L2A

0.5VDC BBPI

R2A

100Ω

C2

C3

R2B

L2B

100Ω

BBMI

1.8pF

1.8pF

GND

GND

5572 F03

Figure 3. LT5572 Baseband Interface with 5th Order Filter and 0.5VCM DAC (Only I Channel is Shown)

5572f

9

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