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参数资料
| 型号： | NTE1254 |
| 厂商： | NTE Electronics, Inc. |
| 英文描述： | Integrated Circuit Phase-Lock Loop (PLL) Frequency Synthesizer for CB |
| 中文描述： | 集成电路锁相环（PLL）频率合成器的文件 |
| 文件页数： | 1/2页 |
| 文件大小： | 23K |
| 代理商： | NTE1254 |
NTE1254
Integrated Circuit
Phase–Lock Loop (PLL) Frequency
Synthesizer for CB
Features:
Programmable Divider – Divided by 3 to 255
10–Bit Divider
Phase Detector
Reference Oscillation Circuit
On–Chip Filter Amplifier
Code Converter
Only two or three crystals required for CB radio AM frequency selection
Unlocked signals are detected at instant stop “IS” terminal
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
.
Internal active filter amplifier has a long holding time due to very high input impedance charac-
teristics of the CMOS–this is to obtain very good spurious response.
Output signal of the “I” can be used to stop the spurious radiation when the channel selector
makes misprogramming such as rotary switch’s lose contact.
High speed and low power consumption due to CMOS
Single power supply and fully TTL compatible: V
DD
= 5
±
0.5 Volts
Operating Temperature: T
A
= –30
°
to 65
°
C
Pull down resistors installed in program and mode switch inputs
Absolute Maximum Ratings:
Supply Voltage
Input Voltage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–0.3 to +6.0V
–0.3 to +6.0V
–35
°
to +75
°
C
–55
°
to +125
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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