NTE1254
Integrated Circuit
Phase鈥揕ock Loop (PLL) Frequency
Synthesizer for CB
Features:
D
Programmable Divider 鈥?Divided by 3 to 255
D
10鈥揃it Divider
D
Phase Detector
D
Reference Oscillation Circuit
D
On鈥揅hip Filter Amplifier
D
Code Converter
D
Only two or three crystals required for CB radio AM frequency selection
D
Unlocked signals are detected at instant stop 鈥淚S鈥?terminal
D
Two type program mode can be selected to change input mode level
M: Low level . Binary code input enables, divided by 3 to 255
M: High level . BCD code enables that the data at P
1
to P
6
port is offset 90 by code converter
D
Internal active filter amplifier has a long holding time due to very high input impedance charac-
teristics of the CMOS鈥搕his is to obtain very good spurious response.
D
Output signal of the 鈥淚鈥?can be used to stop the spurious radiation when the channel selector
makes misprogramming such as rotary switch鈥檚 lose contact.
D
High speed and low power consumption due to CMOS
D
Single power supply and fully TTL compatible: V
DD
= 5
鹵
0.5 Volts
D
Operating Temperature: T
A
= 鈥?0擄 to 65擄C
D
Pull down resistors installed in program and mode switch inputs
Absolute Maximum Ratings:
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +6.0V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +6.0V
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +75擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +125擄C
1
2
