Data Sheet
Skyworks
Doc. No. 101432B
Proprietary Information and Specifications Are Subject to Change
March 12, 2002
CX42054
1700 2200 MHz High Dynamic Range, Diversity Receiver Front End
Skyworks' CX42054 is an integrated, high-dynamic range, low-noise receiver down
converter for two-channel diversity systems. It includes a Low Noise Amplifier
(LNA) followed by a double-balanced active mixer. The CX42054 has dual Local
Oscillator (LO) inputs, selected using an external switch interface. The internal
attenuator is integrated with the LNA. The attenuator function is also controlled
using an externally controlled CMOS-compatible interface.
Figure 1 shows a functional block diagram for the CX42054. The 24-pin Plastic
Quad Flat Pack (PQFP) device package and pinout are shown in Figure 2.
RF A
LNA
LNA
Attenuator
Attenuator
RF
Balun
RF
Balun
RF B
ATTN CONTROL
LO 1
LO 2
LO SELECT
IR FILTER
IR FILTER
IF A
IF B
C1249
LNA
LNA
Amp
Figure 1. CX42054 Functional Block Diagram
Distinguishing Features
High 3
rd
Order Input Intercept Point (IIP3) mixer
and LNA
Wideband RF input frequency range
(1700 to 2200 MHz)
Single or two-channel applications
Use with LNA-mixer cascaded or mixer-only
Bias-selectable LNA/mixer functions
Integrated solid state attenuator
CMOS-compatible control interfaces
5 V supply operation
20
C to +85
C operating range
Supports frequency hopping applications
Applications
PCS/DCS/UMTS communications
Mobile radio systems
WLL
WLAN
Industrial, Scientific, Medical (ISM) band
Applications
1
24
23
22
21
20
19
7
8
9
10
11
12
2
3
4
5
6
18
17
16
15
14
13
C1250
GND
LO_1
ATTN
LO_SEL
LO_2
VSS
LNA_INB
L_GNDB
L_OUTB
MGNDB
M_INPB
M_INNB
LNA_INA
L_GND
A
L_OUT
A
MGND
A
M_INP
A
M_INNA
IFNA
IFPA
LO_GND
VDD
IFPB
IFNB
Figure 2. CX42054 Pinout 24-Pin PQFP Package
CX42054
Diversity Receiver Front End
2
Skyworks
101432B
Proprietary Information and Specifications Are Subject to Change
March 12, 2002
Technical Description
The CX42054 consists of two identical channels, A and B, that
were specifically designed for diversity in base station
applications.
Each channel consists of a single-ended LNA and a double-
balanced differential mixer. The LNAs share a common CMOS-
compatible attenuator control switch, which bypasses the LNA,
providing 20 dB of attenuation.
Each channel shares two independent LO signals, LO1 and
LO2, that are selected using a common CMOS-compatible
control signal. With this ability, the device can be used in
applications where frequency hopping is required.
The LNAs and mixers are independently biased. This allows
design flexibility with power management functions in base
station receivers.
Electrical and Mechanical Specifications
The signal pin assignments and functions are described in
Table 1. The absolute maximum ratings of the CX42054 are
provided in Table 2. The recommended operating conditions are
specified in Table 3 and electrical specifications are provided in
Table 4. Table 5 provides additional electrical specifications for
cascaded channel performance.
Typical performance characteristics of the CX42054 are
illustrated in Figures 3 through 9.
Table 1. CX42054 Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
GND
Ground
13
IFNB
Channel B negative differential mixer IF output
2
LO_1
Local oscillator 1 input for channels A and B
14
IFPB
Channel B positive differential mixer IF output
3
ATTN
Channels A and B attenuator control
15
VDD
Positive supply voltage
4
LO_SEL
LO_1/LO_2 select control
16
LO_GND
Local oscillator ground
5
LO_2
Local oscillator 2 input for channels A and B
17
IFPA
Channel A positive differential mixer IF output
6
VSS
Negative supply voltage
18
IFNA
Channel A negative differential mixer IF output
7
LNA_INB
Channel B LNA input
19
M_INNA
Channel A negative differential mixer input
8
L_GNDB
Channel B LNA ground
20
M_INPA
Channel A positive differential mixer input
9
L_OUTB
Channel B LNA output
21
MGNDA
Channel A mixer ground
10
MGNDB
Channel B mixer ground
22
L_OUTA
Channel A LNA output
11
M_INPB
Channel B positive differential mixer input
23
L_GNDA
Channel A LNA ground
12
M_INNB
Channel B negative differential mixer input
24
LNA_INA
Channel A LNA input
Diversity Receiver Front End
CX42054
101432B
Skyworks
3
March 12, 2002
Proprietary Information and Specifications Are Subject to Change
Table 2. CX42054 Absolute Maximum Ratings
Parameter Symbol
Min
Typical
Max
Units
Positive DC power supply
VDD
+5.5
V
Negative DC power supply
VSS
6.0
V
Power dissipation
P
D
+2.25
W
Input power
P
IN
+15
dBm
Thermal resistance
R
TH
+25 C/W
Operating temperature
T
OPR
20 +85 C
Storage temperature
T
STG
40 +125 C
Note: No damage to device if only one parameter is applied at a time with other parameters at nominal conditions.
Table 3. CX42054 Recommended Operating Conditions
Parameter Symbol
Min
Typical
Max
Units
Positive DC supply voltage
VDD
+4.75
+5.0
+5.25
V
Negative DC supply voltage
VSS
4.75
5.0
5.25
V
Operating temperature
T
OPR
0 +50 C
CX42054
Diversity Receiver Front End
4
Skyworks
101432B
Proprietary Information and Specifications Are Subject to Change
March 12, 2002
Table 4. CX42054 Electrical Characteristics
(+25
C, Voltage Supply = 5 V, LO = 0 dBm, RF Frequency = 1900 MHz, IF Frequency = 135 MHz, Mixer Bias = 55 mA)
Parameter Test
Condition
Min
Typical
Max
Units
Low Noise Amplifier
Gain
11.0
13.5
dB
Noise Figure (NF)
2.6
3.5
dB
Input IP3
+13
+16
dBm
1 dB compression point
+2.0
+5.0
dBm
RF
RF input frequency
1700
2200
MHz
RF input (Note 1)
RF = 1700 MHz to 2000 MHz
RF = 1900 MHz
1.5:1
1.5:1
2.0:1
2.0:1
VSWR
VSWR
RF output (Note 1)
RF = 1700 MHz to 2000 MHz
1.5:1
2.0:1
VSWR
Mixer (Note 2)
Conversion gain
RF = 1800 to 2000 MHz, LO = 1750 MHz
RF = 1700 to 1900 MHz, LO = 1950 MHz
RF = 1900 MHz, LO = 1765 MHz
RF = 1900 MHz, LO = 2035 MHz
3.0
3.0
3.0
3.0
1.5
2.0
1.0
1.5
dB
dB
dB
dB
Single Side Band NF
RF = 1800 MHz to 2000 MHz, LO = 1750 MHz
RF = 1700 MHz to 1900 MHz, LO = 1950 MHz
13
13
14
15
dB
dB
Input IP3
RF = 1900 MHz, LO= 1765 MHz (mixer bias = 80 mA)
RF = 1900 MHz, LO = 1765 MHz
RF = 1900 MHz, LO = 2035 MHz
+18
+15
+15
+24
+21
+21
dBm
dBm
dBm
RF to IF leakage
RF = 1900 MHz, LO = 1765 MHz
RF = 1900 MHz, LO = 2035 MHz
35
35
dBm
dBm
LO to IF leakage
LO = 1765 MHz
LO = 2035 MHz
45
40
dBm
dBm
1dB compression point
(mixer bias = 80 mA)
1 dB compression point
IF product suppression
+11
+9
+17
+15
70
65
dBm
dBm
dBc
Local Oscillator
LO input frequency
1700
2200
MHz
LO input (Note 1)
1.5:1
2.0:1
VSWR
LO level input
5
0
+5
dBm
Intermediate Frequency
IF output frequency
50
250
MHz
IF output (Note 1)
IF = 50 MHz to 200 MHz
IF = 135 MHz
1.5:1
1.5:1
2.0:1
2.0:1
VSWR
VSWR
Note 1: In a 50
system obtained with external matching components on input/output ports. See Figure 10 and Table 6 for matching network configuration and
element values.
Note 2: Include RF balun and IF transformer losses.
Diversity Receiver Front End
CX42054
101432B
Skyworks
5
March 12, 2002
Proprietary Information and Specifications Are Subject to Change
Table 5. Full Channel Performance
(+ 25
C, Voltage Supply = 5 V, LO = 0 dBm, RF Frequency = 1900 MHz, IF Frequency = 135 MHz)
Parameter Test
Condition
Min
Typical
Max
Units
RF input (Note 1)
1.5:1
VSWR
NF (Note 2)
4.6
7.0
dB
Gain (Note 3)
7
11
dB
Input IP3 (Note 4)
mixer bias = 80 mA
mixer bias = 55 mA
+4
+3
+10
+9
dBm
dBm
1 dB compression point (Note 5)
mixer bias = 80 mA
mixer bias = 55 mA
1
2
+5
+4
dBm
dBm
1/2 IF product suppression
65
55
dBc
Channel A to B isolation
35
40
dB
LO leakage at RF input
35
30
dBm
LO1 to LO2 isolation
30
35
dB
Supply current @ +5.0 V, both channels
Supply current @ 5.0 V, both channels
340
10
360
15
mA
mA
Note 1: In a 50
system obtained with external matching network on LNA and mixer input ports. See Figure 10 and Table 6 for network elements and
frequency ranges.
Note 2: Calculated using the following equation:
-
+
+
=
10
G
10
1
10
Loss
NF
10
10
10
NF
Log
10
NF
LNA
IRfilter
Mixer
LNA
Cascaded
Note 3: Calculated using the following equation:
Mixer
IRfilter
LNA
Cascaded
G
Loss
G
Gain
Conversion
+
-
=
Note 4: Calculated using the following equation:
(
)
-
+
-
-
=
1
10
3
IIP
10
1
10
Loss
G
3
IIP
10
1
Log
10
3
IIP
LNA
IRfilter
LNA
Mixer
Note 5: Calculated using the following equation:
less
is
whichever
P
or
Loss
G
P
P
LNA
dB
IRfilter
LNA
Mixer
dB
system
dB
),
(
))
(
(
,
1
,
1
,
1
-
-
=
PDF 
ZIP