ICs for Mobile Communication AN8538SH Single PLL IC for cellular phone ■ Overview 6 0.625±0.10 1.5±0.2 3.0±0.30 5 0.625±0.10 0.5 10 0.15+0.1 –0.05 • Two reference frequencies of 19.68 MHz and 19.8 MHz are available. (Select by SELECT pin.) • Power saving operation (VCC = 2.7 V, 0.9 mA typ.) • 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 1 0.1±0.1 ■ Features 0.2±0.1 Unit: mm 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. 0.5±0.2 4.3±0.30 6.3±0.30 SSOP010-P-0225 ■ Applications • IF local oscillation for cellular phone terminal (CDMA for North America) 6 SW VCC 7 REF 8 9 10 LD SELECT ■ Block Diagram Lock detection 14-bit R counter 15-bit N counter Phase comparator 1/16, 1/17 prescaler 5 PS 4 IFIN 3 GND 2 CP CPSUB 1 Selector 1 AN8538SH ICs for Mobile Communication ■ Pin Descriptions Pin No. Symbol 1 CPSUB 2 CP 3 Description I/O Level Sub charge pump output O CMOS Charge pump output O CMOS GND GND pin 4 IFIN IF input I ECL 5 PS Power save control I CMOS 6 SW Sub charge pump control I CMOS 7 VCC Power 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 Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Symbol Rating Unit VCC 3.6 V ICC 3.5 mA PD 12.6 mW Topr −30 to +85 °C Tstg −55 to +125 °C Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: Ta = 85°C ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 2.55 to 3.3 V ■ Electrical Characteristics at VCC = 2.7 V, fREFIN = 19.68 MHz, VREFIN = 0.6 V[p-p], Ta = 25°C Parameter Conditions Min Typ Max Unit Consumption current 1 ICC1 SELECT = low At 260.76 MHz lock 0.90 1.21 mA Consumption current 2 ICC2 Power save mode At PS = low setting 0 10 µA VREFIN fREFIN = 19.68 MHz 0.5 1.2 V[p-p] Reference signal input level 2 Symbol High-level input voltage VIH 2.16 3.30 V Low-level input voltage VIL 0 0.4 V High-level input current IIH At VIH = 2.16 V applied −1 0 1 µA Low-level input current IIL At VIL = 0 V applied −1 0 1 µA ICs for Mobile Communication AN8538SH ■ Electrical Characteristics at VCC = 2.7 V, fREFIN = 19.68 MHz, VREFIN = 0.6 V[p-p], Ta = 25°C (continued) • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Consumption current 1 ICC1 SELECT = low At 260.76 MHz lock 0.90 1.34 mA Consumption current 2 ICC2 SELECT = high At 260.76 MHz lock 0.90 1.34 mA IF input level VIFIN fIFIN = 100 MHz to 350 MHz − 10 +2 dBm VREFIN fREFIN = 10 MHz to 25 MHz 0.5 1.2 V[p-p] IOZ At VOZ = 0 V, 2.7 V applied − 1.0 +1.0 µA Reference signal input level Output leak current ■ Terminal Equivalent Circuits Pin No. Equivalent circuit Description 1 2 Pin 1: CPSUB Pin 2: CP 2 1 SW 3 GND 4 IFIN 4 4.5 kΩ 4.5 kΩ 5 PS Pin 5 9 6 SW 6 3 AN8538SH ICs for Mobile Communication ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 7 Description VCC 8 REF 10 kΩ 10 kΩ 8 9 Refer to pin 5 SELECT 10 LD 10 ■ Application Notes 1. Input level characteristics 1) IF input level characteristics VCC = 2.55 V to 3.3V Upper limit 10 Ta = −30°C, 25°C, 85°C Input level (dBm) 0 −10 Lower limit Ta = 85°C Ta = 25°C −20 Ta = −30°C −30 −40 75 100 150 200 250 300 Input frequency (MHz) 4 350 ICs for Mobile Communication AN8538SH ■ Application Notes (continued) 1. Input level characteristics (continued) 2) REF input level characteristics VCC = 2.55 V to 3.3V Upper limit 20 Ta = −30°C, 25°C, 85°C Input level (dBm) 10 0 Lower limit −10 Ta = −30°C Ta = 25°C −20 Ta = 85°C −30 0 5 10 15 20 25 30 Input frequency (MHz) 2. Characteristics specification 1) IF select specification SELECT pin control enables you to switch IF as below: SELECT = low → fOUT = 260.76 MHz, fR = 60 kHz (P = 16, N = 271, A = 10, R = 328) SELECT = high → fOUT = 260.76 MHz, fR = 60 kHz (P = 16, N = 271, A = 10, R = 330) 2) Unlock detection and LD output specification LD output is high in a lock mode and low in an unlock mode. Lock signal is outputted in a power save mode. SELECT = high : Detection time is 16 µs. About detection accuracy, when a dividing output shifts by ±(51 × 3) ns for fREF = 60 kHz, it generates an unlock output. SELECT = low : Detection time is 16 µs. About detection accuracy, when a dividing output shifts by ±(51 × 3) ns for fREF = 60 kHz, it generates an unlock output. 3) Power save control specification When power save control pin (PS) is high, it is set to an operating mode. When it is low, it is set to power save mode. 4) Analog SW control specification CPSUB is controlled by SW pin. SW = low : CPSUB open SW = high: CPSUB operation 5) Other specification Set CMOS input pins, such as PS pin, SW pin, SELECT pin, etc., normally to VCC or GND. 5