Preliminary Information
SATURN
SATURN
CDMA/AMPS dual Band IF Receiver for Digital Phones
Preliminary Information
DS4721
Issue 4.2
April 1999
Features
q
Selectable IF input buffers with characteristic
impedance suitable for interface to IF CDMA and
FM SAW filter outputs
AGC amplifiers with 90dB of variable gain, fully
compensated for temperature variation
IQ demodulator with accurately defined output DC
level and low DC offsets
LO operating at twice frequency with high accuracy
quadrature generation
Sophisticated power management control operation
Overload indicator
Odering Information
SATURN/KG/QP1S
SATURN/KG/QP1T
q
q
Description
The SATURN circuit is designed for use in dual band dual
mode mobile phones (CDMA/AMPS). The circuit is
designed to be compataible with digital baseband and
mixed signal circuit chips from Mitel (Planet Chip-set)
and Qualcomm (MSM2 and BBA). A wideband AGC
amplifier allows the input of CDMA or AMPS signal paths
with a range power management control options.
q
q
q
IF VCC
IF VEE
IF OUT
FM IFIN
I OUT
CDMA IFIN
Q OU T
AGC
Gain
Control
Temperature
Comp.
DLL
BAND 1900
Overload
Indicator
STARTUP
ENABLE
MODE CDM
PRESCALER
Mode
Control
VHF VCC
VHF VEE
Figure 1 Block diagram
OVERLOAD DET
VHF BUF
VHF RES
1
SATURN
Preliminary Information
IF VCC
IF OUTB
IF OUT
IF VEE
GND
CDMA IFIN
CDMA IFINB
FM IFIN
FM IFINB
AGC
AGCB
MODE CDMA
ENABLE
GND
VHF VCC
I OUTB
I OUT
VHF VEE
OVERLOAD DET
VHF RES
VHF RESB
BAND 1900
VHF BUF
VHF BUFB
GND
Q OUT
Q OUTB
STARTUP
QSOP28
Figure 2 Pin Connections
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
IF VCC
IF OUTB
IF OUT
IF VEE
GND
CDMA IFIN
CDMA IFINB
FM IFIN
FM IFINB
AGC
AGCB
MODE CDMA
ENABLE
GND
STARTUP
QOUTB
OUT
GND
VHF BUFB
VHF BUF
BAND 1900
VHF RESB
VHF RES
OVERLOAD DET
VHF VEE
I OUT
I OUTB
VHF VCC
Description
Supply for IF inputs and AGC blocks
Post AGC IF output
Post AGC IF output
Ground for IF inputs and AGC blocks
Substrate ground
Post SAW IF input (CDMA)
Post SAW IN input (CDMA)
Post SAW IF input (FM)
Post SAW IF inputs (FM) (AC ground)
AGC Control for IF section
AGC control for IF sections (AC ground)
CDMA/FM mode select
Power up AGC sections of device
Substrate Ground
Power up Oscillator, DLL and Mixer sections of the device
Q channel baseband output
Q Channel baseband output
Ground
VHF oscillator buffered output for synthesiser
VHF oscillator buffered output for synthesiser
VHF oscillator tuning band select input
VHF VCO resonator
VHF VCO resonator
Overload detector output
Ground for VHF VCO and DLL blocks
I channel baseband output
I channel baseband output
Supply for VHF and DLL blocks
2
Preliminary Information
Electrical Characteristics
(Mode Control)
Description
Standby Mode
Start up Mode
SATURN
ENAVLE STARTUP MODE CDMA BAND 1900
0
0
0
0
1
1
X
X
X
X
1
0
Conditions
All circuits powered down
except logic inputs
For high band IF
(210.38MHz)
For low band IF (85.38MHz)
Turns on VCO circuits, DLL
quadrature generation,
prescaler and IQ
demodulator. All other
circuits remain powered
down
CDMA mode
1
1
1
1
1
1
1
0
For high band IF
(210.38MHz)
For low band IF (85.38MHz)
All circuits operational
except for IF output buffer,
CDMA input stage selected.
All circuits operational
except for IF output buffer,
FM input stage selected.
Note 4
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled.
FM Mode
1
1
0
0
Alternative FM mode
CDMA IF AGC
only mode
1
1
1
0
0
1
1
X
FM IF AGC
1
0
0
X
X = Don’t Care
Notes
1.
STARTUP mode is provided to allow VCO/DLL/prescalers to stabilise before signal path is activated. This is a power-saving
feature since the signal path is redundant during this period. If this feature is not required, the ENABLE and STARTUP
control pins can be shorted together so that all circuitry is activated at the same time.
In high band mode (Band 1900 = 1) the VCO operates at twice the IF frequency. For example if IF = 210.38MHz then the
oscillator operates at 420.76MHz. A delay locked loop (DLL) circuit then generates the quadrature LO signals. The prescaler
output, VHFBUF, is VCO frequency divided by 8 (52.494MHz).
In low band mode (Band 1900 = 0) the VCO operates at 4 times the IF frequency. for example if IF = 85.38MHz the oscillator
operates at 341.52MHz. This is then divided and uses DLL circuit to provide the quadrature LO signals. The prescaler output,
VHFBUF, is VCO frequency divided by 8 (42.69MHz).
This mode can be used for FM. The VCO operates at twice the LO frequency. This mode is not normally used as a large
tuning range is required on the VCO. Prescaler output is LO frequency divided by four.
2.
3.
4
3
SATURN
Absolute Limits
Description
Supply Voltage
Operation temperature, Tamb
Storage temperature, Tstg
Junction temperature, Tj
Power dissipation
Maximum Pin Voltage
Minimum Pin Voltage
ESD voltage
-0.6
1.75
-30
-40
-30
Preliminary Information
Min
Typ
Max
4.0
+85
+125
+125
350
Vcc+0.6
Units
Volts
°C
°C
°C
mW
Volts
Volts
kV
Comments
Ambient temperature
All pins except Vcc and GND
All pins except Vcc and GND
Human Body Model
Electrical Characteristics (DC specifications)
Tamb= 30°C to +70°C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.
They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Characteristic
Min
Value
Typ
Max
Units
Conditions
General
Supply Voltage
2.7
3.0
3.6
Operating temperature
-30
27
85
Current Consumption
Standby Mode
0.03
0.1
Startup Mode
8
13
CDMA Mode
14
23
FM Mode
14
23
CDMA AGC only Mode
8
13
FM AGC only Mode
11
18
Mode Control Logic
CMOS input logiv high, VIH
Vcc-0.5
Vcc+0.1
CMOS input high current, IIH
-10
10
CMOS input low current, IIL
-10
10
Switching time between any two Modes
3
AGC Control
0.1
2.6
AGC Input impedance
100
130
160
DC Common Mode voltages
I OUT, I OUTB (CDMA Mode)
Vcc-0.8 Vcc-0.6 Vcc-0.4
I OUTB, QOUTB
I OUT< Q OUT (FM Mode)
Vcc-0.8 Vcc-0.6 Vcc-0.4
I OUTB, Q OUTB
V
°C
mA
mA
mA
mA
mA
mA
V
µA
µA
ms
V
kΩ
V
V
All Vcc Pins
Ambient See note 1
All logic inputs
All logic inputs
All logic inputs
Note 1. Specifications are guaranteed over -30 to + 70°C, however operation is guaranteed over the extended range
of -30 to +85°C with minimal variation in specified parameters.
4
Preliminary Information
Electrical Characteristics (AC specifications) Continued
SATURN
Tamb= 30°C to +70°C, Vcc = +2.7 to +3.6. These characteristics are guaranteed by either production test or design.
They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Frequency = 210.38MHz
Characteristic
Min
CDMA AGC
Max Voltage Gain to demodulator
output
Min Voltage Gain to demodulator
output
Max Voltage Gain to IF buffer output
Min voltage Gain to IF buffer output
AGC control Max
AGC control Min
Gain slope
Gain slope linearity
Gain temperature stability
Channel gain variation
@ 210.38MHz
NF
Gainmax
Input V1dB
Gainmin
IIP3
Gainmin
Input impedance
IF Frequency
CDMA to Amps isolation
48
Value
Typ
50
-55
42
2.6
0.1
40
6
-2
-0.1
5.5
110
104
114
120
500
250
90
2
0.1
6.5
-43
-51
-47
Max
Units
Conditions
dB
dB
dB
dB
V
V
dB/V
dB/V
dB
dB
dB
dBµV
dBµV
dBµV
Ω
MHz
dB
To demodulator outputs
To demodulator
IF AGC only mode
IF AGC only mode
Gain = Gain max
Gain = Gain min
Over gain control range
Within channel bandwidth
Rs (500Ω)
Minimum gain
Power (500Ω)
Minimum gain
With addition of external
resistor across IF inputs
-49
50
30
5
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