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ICs for Mobile Communication
AN8538SH
Single PLL IC for cellular phone
■ 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.
■ Features
• Two reference frequencies of 19.68 MHz and 19.8
MHz are available. (Select by SELECT pin.)
• Power saving operation (V
= 2.7 V, 0.9 mA typ.)
CC
• Power saving function (10 µA 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
■ Applications
• IF local oscillation for cellular phone terminal
(CDMA for North America)
■ Block Diagram
0.5
0.1±0.1
0.5±0.2
Unit: mm
1
5
4.3±0.30
6.3±0.30
SSOP010-P-0225
10
6
+0.1
0.2±0.1
3.0±0.30
0.625±0.100.625±0.10
1.5±0.2
–0.05
0.15
LD
10
Lock detection
14-bit R counter
Phase comparator
Selector
1
CPSUB
SELECT
9
2
CP
REF
8
3
GND
CC
V
7
15-bit N counter
1/16, 1/17 prescaler
4
IFIN
SW
6
5
PS
1
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AN8538SH ICs for Mobile Communication
■ Pin Descriptions
Pin No. Symbol Description I/O Level
1 CPSUB Sub charge pump output O CMOS
2 CP Charge pump output O CMOS
3 GND GND pin
4 IFIN IF input I ECL
5 PS Power save control I CMOS
6 SW Sub charge pump control I CMOS
7VCCPower supply pin
8 REF Reference frequency input I ECL
9 SELECT IF frequency changeover control I CMOS
10 LD Lock detection output O CMOS
■ Absolute Maximum Ratings
Parameter Symbol Rating Unit
Supply voltage V
Supply current I
2
Power dissipation
Operating ambient temperature
Storage temperature
Note)*1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
2: Ta = 85°C
*
*
1
*
1
*
CC
CC
P
D
T
opr
T
stg
3.6 V
3.5 mA
12.6 mW
−30 to +85 °C
−55 to +125 °C
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
CC
■ Electrical Characteristics at VCC = 2.7 V, f
Parameter Symbol Conditions Min Typ Max Unit
Consumption current 1 I
Consumption current 2 I
Reference signal input level V
High-level input voltage V
Low-level input voltage V
High-level input current I
Low-level input current I
2
SELECT = low 0.90 1.21 mA
CC1
At 260.76 MHz lock
Power save mode 010µA
CC2
At PS = low setting
REFINfREFIN
IH
IL
IH
IL
= 19.68 MHz 0.5 1.2 V[p-p]
At VIH = 2.16 V applied − 10 1 µA
At VIL = 0 V applied − 10 1 µA
= 19.68 MHz, V
REFIN
2.55 to 3.3 V
= 0.6 V[p-p], Ta = 25°C
REFIN
2.16 3.30 V
0 0.4 V