Philips SA900BE Datasheet

INTEGRATED CIRCUITS

SA900

I/Q transmit modulator

Preliminary specification 1997 Sept 16
IC17 Data Handbook

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Philips Semiconductors Preliminary specification

SA900I/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.

FEA TURES

•V

= 4.0V

CC

•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

adjustments required

•On-chip crystal oscillator with 3 buffered outputs

•AMPS/TACS compatible

•On-chip VCO

PIN CONFIGURATION

BE Package

I

Vcc

CLK2

GND

I

QQGND

424344

20 21 22 23 24

DATA

MCLK

CLKSET

394041 3738

CLOCK

GND
TXLO_2
TXLO_1

GND

Vcc

TANK_1
TANK_2

Vcc

PHSOUT

I

PEAK

GND

XTAL_1

Vcc

LO_2

LO_1

1
2
3
4
5
6
7
8

9
10
11
12

13 14 15 16 17 18 19

Vcc

CLK1

XTAL_2

GND

45464748

GND

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)

Vcc

GND

TXEN

STROBE

36
35
34
33
32
31
30
29
28
27
26
25

Vcc
GND
DUALTX
GND
Vcc
AMPSTX
GND
Vcc
GND
Vcc
Vcc
GND

SR00636

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

48-Pin Plastic Low Profile Quad Flat Package (LQFP)

1997 Sept 16 853-

2

-40 to +85°C

SA900BE SOT313-2

Philips Semiconductors Preliminary specification

SA900I/Q transmit modulator

BLOCK DIAGRAM

TXLO_2
TXLO_1

TANK_1
TANK_2

PHSOUT

I

PEAK

XTAL_1

XTAL_2

LO_2 LO_1

VCO

÷N

÷A8/1

PHS
DET

XTAL

OSC

AD

÷B8/1

TXLO

LPF

IMAGE

REJECT

VCO

MIXER

2

AD

AD

÷÷÷

SM1 SM2

SM1 SM2

XY

3/1 4/5/1

2/1

PHASE

SHIFT

NETWORK

BIAS

LPF

LPF

BG

CONV2

II QQ

SE

N<0:1>

AD

SM1

SM2

Y

X

VGA PA

VGA

CONTROL

CONTROL

LOGIC

DUALTX

PA

6

AMPSTX

CLK2CLK1

MCLK

Figure 2. Block Diagram

TXENSTROBECLOCKDATACLKSET

SR00637

1997 Sept 16

3

Philips Semiconductors Preliminary specification

SA900I/Q transmit modulator

PIN DESCRIPTIONS

Pin Description

I Non-inverting I Mod Signal
I Inverting I Mod Signal

TXLO_1/2 Second LO Input (differential/single-ended input)

DUALTX RF output (850MHz) digital (DUAL) mode, complex modulated output

Q Non-inverting Q Mod Signal
Q Inverting Q Mod Signal

CLK1 Buffered oscillator output (XO ÷3/÷1)

MCLK Buffered oscillator output (XO ÷4/÷5/÷1)

CLK2 Buffered oscillator output (XO ÷2/÷1)

AMPSTX RF output (850MHz) AMPS mode

V

CC

GND Ground
Data Serial data input

Clock Serial clock input
Strobe Data strobe input
TXEN AMPS and Dual Mode transmit enable

CLKSET Program control pin for MCLK prescaler

XTAL1 Crystal oscillator base input
XTAL2 Crystal oscillator emitter output

PHSOUT Phase comparator charge pump output

TANK_1 VCO differential tank
TANK_2 VCO differential tank

LO_1/2 Buf fered dif ferential TXLO output

I

PEAK

+5VDC power supply

Phase comparator current programming

1997 Sept 16

4

Philips Semiconductors Preliminary specification

SA900I/Q transmit modulator

GND_LO GND GND GND GND GND_CTRL GND GND GND GND GND GND GND

1 4 11 16 18 25 28 30 33 35 37 39 45

GND

VCC_LO VCC_CTRLVCCVCCVCCV

48 5 8 14 27 29 32 36 38 44 26

V

CC

2

V

CC

3

V

CC

6

CC

50Ω

50Ω

V

CC

VCCVCCVCCV

CC

9

1997 Sept 16

V

CC

7

V

CC

V

CC

0.1/6.4 mA

0.1/6.4 mA

12

V

CC

13

SR00638

Figure 3. Pin Diagrams

5

Philips Semiconductors Preliminary specification

SA900I/Q transmit modulator

V

CC

19

1715

V

CC

23

2221

V

CC

31

30Ω

24

V

CC

500Ω

20

34

V

CC

500Ω

V

CC

600Ω

42

40

680Ω680Ω

V

CC

43

41

V

CC

47

46

20Ω

SR00639

Figure 4. Pin Diagrams (cont.)

1997 Sept 16

6