MXD8646A
X-DPDT Switch for 0.4½3.8G Application
VED
APPRO
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MXD8646A – X-DPDT Switch for 0.4½3.8G Application
General Description
The MXD8646A is a CMOS, Silicon-On-Insulator
(SOI) double-pole, double-throw (DPDT) switch.
The switch provides high linearity performance,
low insertion loss and high isolation.
Switching is controlled by one control voltage,V1.
Depending on the logic voltage level applied to
this pin, the RF1 and RF2 pins connect to one of
the two other RF port pins (RF3 or RF4) through a
low insertion loss path, while maintaining a high
isolation path to the alternate port. No external DC
blocking capacitors are required on the RF path as
long as no DC voltage is applied externally.
The MXD8646A DPDT switch is provided in a
compact Quad Flat No-Lead (QFN) 2 x 2 mm
package. A functional block diagram is shown in
Figure 1. The pin configuration and package are
shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Applications
Simultaneous voice and LTE systems
Diversity antenna switching
Features
Single control voltage input
Broadband frequency range: 0.4 to 3.8 GHz
Low insertion loss: 0.55 dB @ 2.7 GHz
P0.1dB of 36dBm
No DC blocking capacitors required
Positive control voltage range: 1.8 to 3.3 V
Small, QFN (12-pin, 2 x 2 mm) package
Functional Block Diagram and Pin Function
GND
GND
12
RF3
11
10
RF3
RF4
VDD
1
9
RF4
N/C
2
8
N/C
RF2
RF1
V1
3
7
RF1
4
5
6
RF2
GND
GND
Figure 1. Functional Block Diagram
Figure 2. Pin Diagram
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MXD8646A – X-DPDT Switch for 0.4½3.8G Application
Application Circuit
RF3
GND
GND
RF3
VDD
VDD
RF4
RF4
N/C
MXD8646A
N/C
V1
V1
RF1
GND
GND
RF1
RF2
RF2
Figure 3. MXD8646A Evaluation Board Schematic
Table 1. Pin Description
Pin No.
1
2
3
4
5
6
Note:
Bottom
Name
Description
Pin No.
7
8
9
10
11
12
Name
RF1
N/C
RF4
GND
RF3
GND
Description
RF port 1
No connection
RF Port 4
Ground.
RF port 3
Ground.
VDD
DC power supply
N/C
No connection
V1
DC control voltage 1.
GND
Ground.
RF2
RF port 2
GND
Ground.
ground paddles must be connected to ground.
Table 2. Truth Table
V1
1
0
State
Note:
“1” = 1.8 to 3.1 V,“0” = –0.20 to +0.45 V;
Any state other than described in this Table places the switch into an undefined state.
RF3 to RF1,RF4 to RF2
RF3 to RF2, RF4 to RF1
Recommended Operation Range
Table 3.
Parameters
Operation Frequency
Power supply
Switch Control Voltage High
Switch Control Voltage Low
Symbol
f1
V
DD
V
CTL_H
V
CTL_L
Min
0.4
1.8
1.5
-0.2
Typ
-
2.8
1.8
0
Max
3.8
3.3
3.3
0.4
Units
GHz
V
V
V
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MXD8646A – X-DPDT Switch for 0.4½3.8G Application
Specifications
Table 4. Electrical Specifications
Parameter
DC Specifications
Control voltage:
Low
High
Supply voltage
Supply current
Control current
V
CTL_L
V
CTL_H
V
DD
I
DD
I
CTL
0
1.5
1.8
0
1.8
2.8
60
1
0.40
0.45
0.55
0.70
30
26
23
20
20
+36
-40
-40
1
1
10
5
5
0.3
3.3
3.3
85
5
μA
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
μs
μs
μs
V
V
V
V
DD
= 2.8 V
V
CTL
= 1.8 V
0.7 to 1.0 GHz
1.0 to 2.2 GHz
2.5 to 2.7 GHz
3.4 to 3.8 GHz
0.7 to 1.0 GHz
1.0 to 2.2 GHz
2.5 to 2.7 GHz
3.4 to 3.8 GHz
0.7 to 3.0 GHz
0.7 GHz to 3 GHz
Symbol
Min.
Specification
Typical
Max.
Units
Test Condition
RF Specifications
Insertion loss (RF1/RF2
to RF3/RF4)
IL
28
23
20
18
17
Isolation (RF1/RF2 to
RF3/RF4, RF1 to RF2,
RF3 to RF4)
Input return loss
(RF1/RF2 to RF3/RF4)
0.1 dB Compression
Point (RF1/RF2 to
RF3/RF4)
2nd Harmonic
(RF1/RF2 to RF3/RF4)
3rd Harmonic(RF1/RF2
to RF3/RF4)
Switching on time
Switching off time
Startup time
ISO
RL
P
0.1dB
2fo
3fo
fo = 824 to 915 MHz, PIN =
+35 dBm
50% VCTL to 90% RF
50% VCTL to 10% RF
Power off state to any RF
switch state
Absolute Maximum Ratings
Table 5 Maximum ratings
Parameters
Supply voltage
Digital control voltage
RF input power
Operating temperature
Storage temperature
Electrostatic Discharge
Human body model (HBM),
Class 2
Machine Model (MM),
Class B
Charged
device
model
(CDM), Class III
Symbol
V
DD
V
CTL
P
IN
T
OP
T
STG
ESD_HBM
ESD_MM
ESD_CDM
Minimum
+1.8
-0.3
–30
–55
Maximum
+3.6
+3.3
+38
+85
+150
2000
200
500
Units
V
V
dBm
℃
℃
V
Note:
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with
only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed
here may result in permanent damage to the device
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