ICs for Mobile Communication
1
AN8538SH
Single PLL IC for cellular phone
n Overview
The AN8538SH is a single PLL IC with a fixed
frequency dividing ratio for IF local oscillation of
a cellular phone. You can generate a local signal of
260.76 MHz by using a reference signal of 19.68
MHz or 19.8 MHz.
n Features
• Two reference frequencies of 19.68 MHz and 19.8
MHz are available. (Select by SELECT pin.)
• Power saving operation (V
CC
= 2.7 V, 0.9 mA typ.)
• Power saving function (10 m A max.)
• Two systems of charge pump output (one of them
can be switched to on/off with SW pin.)
• Lock detection function
• SSONF-10D small package
n Applications
• IF local oscillation for cellular phone terminal
(CDMA for North America)
SSOP010-P-0225
Unit: mm
4.3±0.30
6.3±0.30
0.5±0.2
0.1±0.1
1
5
10
6
0.2±0.1
0.5
3.0±0.30
1.5±0.2
0.625±0.10
0.625±0.10
0.15
+0.1
–0.05
n Block Diagram
10
9 8 7 6
1
LD SELECT REF V
CC
SW
2 3 4 5
14-bit R counter
Phase comparator
Selector
Lock detection
15-bit N counter
1/16, 1/17 prescaler
PS
IFIN
GND
CP
CPSUB