Features
q
Selectable dual RF input ports for 900MHz AMPS
and 1900MHz CDMA bands.
q
Power Management Control
Description
VENUS-L is a dual integrated mixer circuit designed to
meet the IS95 and J-STD-008 receive system specifica-
tions operating in the 900 MHz and 1900MHz bands.
Venus-L is part of a complete chipset solution for CDMA
phones called the Planet chipset, and is built on a Mitel
advanced bipolar process with FT's of 25GHz.
Figure 2. Block diagram
VENUS-L
CDMA/AMPS Dual Band RF Receiver
Preliminary Information
DS5082
Issue 2.1 J
June 1999
GND
VCC
CDMA IF
CONTROL
CDMA IFB
AMPS IF
AMPS IFB
CHIP ENABLE
BAND 1900
LO 1GHZ
LO 2GHZ
RF 1900
RF 900
Ordering Iinformation
VENUS-L/KG/QP1S
VENUS-L/KG/QP1T
2
VENUS-L
Preliminary Information
PIN 1
REF
. SPOT
Figure1 Pin Connections
QSOP16
CDMA IF
CDMA IFB
VCC
LO 2GHZ
GND
RF 900
GND
CHIP ENABLE
BAND 1900
GND
RF 1900
GND
LO 1GHZ
VCC
AMPS IFB
AMPS IF
9
16
8
1
Circuit Description
The RF section of VENUS-L contains all of the circuitry
necessary to downconvert the RF signal from 900 MHz
or 1900 MHz to an IF of 50-250 MHz, and to correctly
interface with a suitable IF SAW filter. Two RF inputs are
provided, one for the 1900MHz band and one for the 900
MHz band. The required input is activated by means of
the `BAND 1900' pin.
The input is a gm stage which will provide a
characteristic impedance to correctly terminate the RF
image-reject SAW filter.
Two LO ports are provided, one for 1900MHz band and
one for 900 MHz band, both with low noise buffer
amplifiers.
External matching components are required on the RF,
LO and IF ports.
Pin Description
Pin No
Pin Name
Description
1
CDMA IF
CDMA (1900MHz mixer) IF SAW output
2
CDMA IFB
CDMA (1900MHz mixer) IF SAW output bar
3
VCC
Positive supply
4
LO 2GHZ
2 GHz LO input for 1900MHz mixer
5
GND
Ground
6
RF 900
900MHz RF input
7
GND
Ground
8
CHIP ENABLE
Logic input for chip enable
9
AMPS IF
AMPS (900MHz mixer) IF SAW output
10
AMPS IFB
AMPS (900MHz mixer) IF SAW output bar
11
VCC
Positive supply
12
LO 1GHZ
1GHz LO input for 900MHz mixer
13
GND
Ground
14
RF 1900
1900MHz RF input
15
GND
Ground
16
BAND 1900
Logic input to select 1900MHz or 900MHz signal path operation
3
Preliminary Information
VENUS-L
Absolute Limits
Description
Min.
Typ.
Max.
Units
Comments
Supply voltage, Vcc
4.0
V
Operating temperature, Top
-30
70
deg C
Pin temperature
Storage temperature, Tstg
-40
125
deg C
Ambient temperature
Junction temperature
-30
125
deg C
Logic input high, VIH
Vcc+0.6
V
Logic input low, VIL
-0.6
V
Electrostatic Protection. High frequency RF device. This device has limited ESD protection on some pins (500V
Human body Model). Electrostatic handling precautions must be applied.
Description
CHIP ENABLE
BAND 1900
Comments
Standby Mode
0
X
All circuits powered down
900MHz (AMPS)
1
0
900MHz (AMPS) signal path enabled
1900MHz (CDMA)
1
1
1900MHz (CDMA) signal path enabled
Electrical Characteristics (DC specification)
T
AMB
= -30
C to +70
C, V
CC
= +2.7 to +3.6V. These characteristics are guaranteed by either production test or
design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.
Operating Modes
Characteristic
Value
Units
Conditions
Min
Typ
Max
General
Supply voltage
2.7
3.0
3.6
V
All Vcc pins.
Operating. Temperature
-30
25
70
deg C
Ambient
Current Consumption
Standby Mode, RF section
10
100
A
1900MHz Mode operation
15
mA
900MHz Mode operation
13
mA
Control Logic
Input logic high, VIH
Vcc-0.5
Vcc+0.1
V
All logic inputs
Input logic low, VIL
-0.1
0.5
V
All logic inputs
Input high current, IIH
-10
10
A
All logic inputs
Input low current, IIL
-10
10
A
All logic inputs
4
VENUS-L
Preliminary Information
Electrical Characteristics (AC specification)
T
AMB
= -30
C to +70
C, V
CC
= +2.7 to +3.6V. These characteristics are guaranteed by either production test or
design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.
Unless otherwise stated the frequencies used for measurements are to be.
1900MHz Signal Path: RF = 1960MHz, LO = 1749.62MHz, IF = 210.38MHz.
Characteristic
Value
Units
Conditions
Min
Typ
Max
1900MHz Signal Path
Input = RF 1900
Output =CDMA IF and CDMA IFB
Overall Power Gain, RF input to IF
8
9
10
dB
LO= -10dBm from a 50 Ohm source
output
Noise Figure
9
11
dB
Total to IF outputs (SSB).
Input third order intercept point
4
dBm
RF Input impedance
50
Ohm
With simple external matchin
network. Matching network must
include an inductor connected
between the RF 1900 pin and GND.
RF port Return Loss
15
dB
With simple external matching
network. Matching network mus
include an inductor connected
between the RF 1900 pin and GND
RF Frequency
1800
2000
MHz
IF Frequency
50
250
MHz
Input 1dB compression
-10
dBm
Load impedance
1000
Differential.Will require an
external resistor and a simple
external matching network.
5
Preliminary Information
VENUS-L
Electrical Characteristics (AC specification ) Continued
T
AMB
= -30
C to +70
C, V
CC
= +2.7 to +3.6V. These characteristics are guaranteed by either production test or
design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.
Unless otherwise stated the frequencies used for measurements are to be.
900MHz Signal Path: RF = 881.5MHz, LO = 966.88MHz, IF = 85.38MHz.
Characteristic
Value
Units
Conditions
Min
Typ
Max
900MHz Signal Path
Input=RF 900 Output=AMPS IF
and AMPS IFB
Overall Power Gain, RF input to IF
7
8
9
dB
LO= -10dBm from a 50ohm
source
output
Noise Figure
9
11
dB
Total to IF outputs (SSB).
Input third order intercept point
5
dBm
RF Input impedance
50
Ohm
With simple external matching
network. Matching network must
include an inductor connected
between the RF 900 pin and GND.
Return Loss
15
dB
With simple external matching
network. Matching network must
include an inductor connected
between the RF 900 pin and GND
RF Frequency
800
1000
MHz
IF Frequency
50
250
MHz
Input 1dB compression
-8
dBm
Load impedance
850
Differential. Will require an
externa lresistor and a simple
external matching network.
RF LO BUFFERS
LO feedthrough to IF outputs
-30
dBm
LO feedthrough to RF inputs
-40
dBm
LO input level
-10
-5
dBm
LO input impedance
50
With simple external matching
network
LO port Return Loss
15
dB
With simple external matching
network
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