Philips Semiconductors
Preliminary specification
I/Q transmit modulator
DO NOT DISTRIBUTE WITHOUT ECN DATED AFTER Sept 16, 1997
DESCRIPTION
The SA900 is a monolithic high performance, multi-function transmit
modulator for use in cellular radio applications, fabricated in QUBiC
BiCMOS technology. The SA900 features both analog (AMPS)
mode and complex, I/Q digital (NADC IS–136) mode quadrature
modulation functions, a PLL synthesizer with VCO, crystal oscillator,
programmable prescalers and Gilbert cell multiplier phase detector
with programmable charge pump output. The DUALTX output can
be used in DUAL mode cellular phone applications with the AMPS
and NADC modulation being applied to the I/Q baseband inputs.
The DUALTX output also provides 6-bit power control with 40dB of
gain control in 0.63dB steps. In addition, buffered crystal oscillator
programmable prescaler outputs are provided to support system
clock reference needs. Programming of the SA900 functions are
realized by a high speed 3-wire serial interface. The SA900 can be
programmed into a sleep mode (low current mode providing crystal
oscillator and Master Clock functions), a standby mode (providing
crystal oscillator, Master Clock, System Clock 1 and Transmit LO
buffer functions), and the AMPS mode and the DUAL mode
configurations.
SA900
PIN CONFIGURATION
BE Package
LO_2
LO_1
GND
GND
GND
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
XTAL_2
MCLK
DATA
Vcc
GND
CLK1
CLK2
GND
CLOCK
STROBE
CLKSET
TXEN
Vcc
Vcc
Vcc
Q
Q
I
I
48 47 46 45 44 43 42
1
2
3
4
5
6
7
8
9
41 40 39 38 37
Vcc
GND
DUALTX
GND
Vcc
AMPSTX
GND
Vcc
GND
Vcc
Vcc
GND
GND
TXLO_2
TXLO_1
GND
Vcc
TANK_1
TANK_2
Vcc
PHSOUT
I
PEAK
10
GND
11
XTAL_1
12
FEATURES
•
V
CC
= 4.0V
•
Tx output frequency = 900MHz
•
Direct modulation of RF
•
DUAL mode, on-chip PA control
•
I/Q modulator
•
Single sideband quadrature LO generation with no external
•
On-chip crystal oscillator with 3 buffered outputs
•
AMPS/TACS compatible
•
On-chip VCO
ORDERING INFORMATION
DESCRIPTION
48-Pin Plastic Low Profile Quad Flat Package (LQFP)
adjustments required
SR00636
Figure 1. Pin Configuration
•
Selective power-down
–
Low power AMPS/TACS mode
–
Low power dual mode NADC
•
48-Pin TQFP package
APPLICATIONS
•
North American Digital Cellular (TDMA IS-136)
TEMPERATURE RANGE
-40 to +85
°
C
ORDER CODE
SA900BE
DWG #
SOT313-2
1997 Sept 16
2
853-
Philips Semiconductors
Preliminary specification
I/Q transmit modulator
SA900
PIN DESCRIPTIONS
Pin
I
I
TXLO_1/2
DUALTX
Q
Q
CLK1
MCLK
CLK2
AMPSTX
V
CC
GND
Data
Clock
Strobe
TXEN
CLKSET
XTAL1
XTAL2
PHSOUT
TANK_1
TANK_2
LO_1/2
I
PEAK
Non-inverting I Mod Signal
Inverting I Mod Signal
Second LO Input (differential/single-ended input)
RF output (850MHz) digital (DUAL) mode, complex modulated output
Non-inverting Q Mod Signal
Inverting Q Mod Signal
Buffered oscillator output (XO
÷3/÷1)
Buffered oscillator output (XO
÷4/÷5/÷1)
Buffered oscillator output (XO
÷2/÷1)
RF output (850MHz) AMPS mode
+5V
DC
power supply
Ground
Serial data input
Serial clock input
Data strobe input
AMPS and Dual Mode transmit enable
Program control pin for MCLK prescaler
Crystal oscillator base input
Crystal oscillator emitter output
Phase comparator charge pump output
VCO differential tank
VCO differential tank
Buffered differential TXLO output
Phase comparator current programming
Description
1997 Sept 16
4
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