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LANSDALE Semiconductor, Inc.

ML145106

Figure 4. VHF Marine Transceiver Synthesizer

LOCK DETECT

VDD

GND

0.2425 – 0.3825

(0.4850 – 0.7650)

*0.3800

TRANSMIT RANGE

156.025 – 157.425 MHz

*157.4

RECEIVER L.O. RANGE

145.575 – 152.575 MHz

*151.3

MODULATION

5.12 MHz

(10.24 MHz)

VCO AND

BUFFER

LOOP

FILTER

14.29

(28.58)

SIMPLEX

14.75#

(29.50)

DUPLEX

RECEIVE

TRANSMIT

15.36 (30.72)

RECEIVE OFFSET

OSCILLATOR

10 ( 5)

MIXER

TRIPLER

BUFFER

FILTER

PROGRAMMABLE INPUTS

N = 97 TO 153 *152

N 29 – 1

2.5 kHz

(5.0 kHz)

ML145106

PHASE

DETECTOR

29, 210

DIVIDER

2

REF

OSC

TRANSMIT

MODULATION

CIRCUIT

NOTES:

• Receiver IF = 10.7 MHz.

• Low Side Injection.

• Duplex Offset = 4.6 MHz.

• Step Size = 25 kHz.

• Frequencies in MHz unless noted.

• Values in parentheses are for a 5.0 kHz reference frequency.

• Example frequencies for Channel 28 shown by *.

N for Duplex Channels.

Legacy Applications Information

#Can be eliminated by adding 184 to