SA9025 Datasheet, PDF (2/23 Pages) NXP Semiconductors – 900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer

Philips Semiconductors
900 MHz transmit modulator and 2.2 GHz
fractional–N synthesizer
Objective specification
SA9025
DESCRIPTION
This specification defines the requirements for a transmitter
modulator and fractional–N synthesizer IC to be used in cellular
telephones which employ the North American Dual Mode Cellular
System (IS–136).
FEATURES
• Low current from 3.75V supply
• Low phase noise
• Main loop with internal charge pump and fractional compensation
• 3–line serial interface bus
• Power down for the synthesizers
• Speedup mode for faster switching
APPLICATIONS
• Cellular phones
• Portable battery–powered radio equipment.
GENERAL DESCRIPTION
The SA9025 BICMOS device integrates:
• Main channel synthesizer
• Auxiliary synthesizer
• Transmit offset synthesizer and oscillator
• I/Q modulator
• Power control
• Reference and clock buffers
• Control logic for programming and power down modes
PIN CONFIGURATION
48 47 46 45 44 43 42 41 40 39 38 37
PHP ¹
V _CC 2
RXLO1 ³
RXLO2 4
GND 5
V _{CC 6}
TXLO1 ⁷
TXLO2 8
GND ⁹
PHS out 10
Ipeak ¹¹
TANK1 12
SA9025
13 14 15 16 17 18 19 20 21 22 23 24
36 _XTAL2
35 _TXEN
34 DATA
33 _CLOCK
32 _LOCK
31 _STROBE
30 _GND
29 _{V CC}
28 _I
27 _I
26 _Q
25 _Q
Figure 1. Pin Configuration
SR01446
QUICK REFERENCE DATA
SYMBOL
V_CC
I_CC
I_{CC_save}
f_VCO
f_AUX
f_XTAL
f_PC
T_amb
PARAMETER
Supply voltage
Supply current
Total supply current in power–down
mode
Input frequency
Input frequency
Crystal reference input frequency
Maximum phase comparator frequency
Operating ambient temperature
CONDITIONS
V_CC
Main and Aux loops
MIN.
3.6
–
–
800
10
10
–
–40
TYP.
3.75
TBD
TBD
–
–
–
–
–
MAX.
3.9
–
–
2200
500
40
5
+85
UNIT
V
mA
mA
MHz
MHz
MHz
MHz
°C
ORDERING INFORMATION
TYPE NUMBER
SA9025
NAME
LQFP48
PACKAGE
DESCRIPTION
Plastic low profile quad flat package; 48 leads; body 7x7x1.4 mm
VERSION
SOT313-2
1997 Aug 01
2