CXA3038N Ver la hoja de datos (PDF) - Unspecified

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Fabricante

CXA3038N

A New Age of Unified High-Frequency Analog and Digital Circuits Digital Satellite Broadcast Tuner IC

Unspecified 

BS

Converter

Set Top Box

Tuner pack

Channel

Selection

CXA3108Q

SAW

Filter

Video

output

Audio

output

MPEG

Decoder

Descrambler

Quadrature

Demodulation

CXA3038N

QPSK Demodulation

Error Correction

CXD1961Q

s Figure 1 Digital Satellite Broadcast Reception Set Top Box Block Diagram

CXA3108Q

1st IF

from LNB

Mix.

AGC amp. Output buffer

SAW

480MHz

1.4~2.7

GHz

Osc.

1T379

1T379

PLL

Ref clock

30V

Loop

Filter

I2C bus (SDA, SCL)

or

3-wire bus (DAT, CL, ENA)

s Figure 2 CXA3108Q and CXA3038N Block Diagram

Gain controller

I mix.

AGC

amp.

+90°

Q mix.

Ref

osc.

Osc.

CXA3038N

I out

LPF

LPF

÷32

PLL

Loop

Filter

Q out

A/D

Freq.

adjust

fIF=480MHz

20

CG (conversion gain)

15

NF (noise figure)

10

1.0

1.5

2.0

Reception Frequency (GHz)

s Figure 3 CXA3108Q Frequency Conversion Characteristics

+1

IQ amplitude error

0

-1

IQ phase error

95

750mVp-p

1000mVp-p

90

85

-40

-30

-20

-10

Input Level (dBm)

s Figure 4 CXA3038N Quadrature Error

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