14

SL1714

Fig.13 Example digital front end architecture

Note: All ICs shown in Fig. 12 are available from Mitel Semiconductor.

AGC

RF I/P

from

LNB

I/P

Filter

950MHz

2.15GHz

TUNER

(SL2015)

Tank

circuit

480MHz IF

IF

Filter

RF TUNER

MODULE

AGC

TANK

AGC

VCO

I

Q

PLL SYNTH. options

(SP5658) (3w bus)

(SP5055) (I2C bus)

(SP5655) (I2C bus)

(SP5659) (I2C bus)

0.22MHz

0.7V pk-pk

(SL1711)

2x6 bit, 90MS/s

ADC

(VP216)

VCO I/p

Loop/line

Filters

QPSK

Demod & FEC

(VP305)

Data

Stream

SL1714