CONEXANT RF106

RF106 900 MHz Power Amplifier
Product Description
Features
The RF106 is a class AB RF power amplifier for 900 MHz
ISM band applications. It delivers output power
proportional to the input signal power.
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The RF106 power amplifier, combined with Conexant's
RF105 diSSTance™ (digital Spread Spectrum
Technology) transceiver, forms a complete system
solution for a direct conversion 900 MHz diSSTance radio
which is fully compliant with FCC Part 15 regulations in
the ISM band.
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Applications
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The RF106 is operational in the 900 MHz ISM band with
supply voltage ranging from 2.7V to 5V. It is available in a
small 20-pin TSSOP package, shown in Figure 1. Figure 2
shows a block diagram for the RF106.
RFOUT
GND1
MATCH
VCC1
NC
VCC2
NC
VCC3
GND2
ENABLE
1
2
3
4
5
6
7
8
9
10
Class AB-type RF power amplifier
100 mW peak envelope output power
Very fast settling from standby mode to active
mode
Efficient high output power operation
Very few external components required
20-pin TSSOP package
RF106
diSSTance-technology cordless telephone
Direct sequence spread spectrum systems
Frequency hopping spread spectrum systems
Wireless LANs
Wireless modems
Wireless security
Inventory control systems
20
19
18
17
16
15
14
13
12
11
GND9
GND8
GND7
GND6
NC
NC
GND5
GND4
GND3
RFIN
Figure 1. RF106 Pin Signals – 20 Pin TSSOP
RFIN
ENABLE
A1
A2
A3
RFOUT
Bias
Figure 2. RF106 Block Diagram
Data Sheet
2/1/99
Order No. W118
RF106 900 MHz Power Amplifier
Technical Description
The RF106 is a three stage, class AB RF power amplifier
for the 902-928 MHz ISM band. A class AB power
amplifier allows a wide range of output powers without
excessive idle power dissipation. Figure 3 shows a typical
application circuit for the RF106.
A bypassing capacitor of 33pF and a decoupling capacitor
of 1nF for low frequency noise are recommended. Due to
layout variations the value of the capacitor may vary.
General Grounding Requirements
All ground pins should have minimum trace inductance to
ground. If a ground plane cannot be provided right at the
pins, the vias to ground plane should be placed as close
to the pins as possible. There should be one via for each
ground pin, unless otherwise specified. If the ground
plane is at the bottom layer, two vias per pin in parallel
may be required.
Recommendations on Layout and Implementation
Matching
An input matching network and an output matching
network are needed for maximum power transfer. For
greatest efficiency, it is recommended that the input
matching network be determined before the output
matching network. Matching network values are layoutsensitive. If the RF106 is used with Conexant's RF105
transceiver, the input matching network is not required if
the connecting traces are short.
It is important to provide pins 13 and 14 with separate
low-impedance connections to GND, isolated from other
top-layer grounds.
NC pins are not used and should be connected to ac
ground, Vcc or ground, as shown in Figure 3.
Bypassing
ESD Sensitivity
All VCC pins should have proper bypassing. These
decoupling capacitors should be placed very close to the
pins, preferably right at the Vcc pins.
The RF106 is a static-sensitive electronic device. Do not
operate or store near strong electrostatic fields. Take
proper Electrostatic Discharge (ESD) precautions.
Vcc
1nF
Rx
section
90°
phase
shifter
33pF
Matching
network*
22nH
33pF
LPF
470
33pF
Output
matching
network*
10k Ω
Vcc
1.5nH
10 Ω
1nF
1
20
2
19
3
18
4
17
33pF
5
Vcc
10 Ω
1nF
Vcc
6
15
7
14
8
13
9
12
10
11
33pF
10 Ω
1nF
16
RF106
33pF
ENABLE
33pF
Input
matching
network*
RFIN
* Matching network values are layout-dependent.
Figure 3. RF106 Typical Application Circuit
2
Conexant
W118
2/1/98
RF106 900 MHz Power Amplifier
Interface Description
Table 1 describes the pin signals for the RF106.
Table 1. Pin Signal Description
Pin No. Name
Description
1
RFOUT
Power amplifier output
Connect to power supply through an inductor; matching network required before connecting to antenna.
2
GND1
Ground
3
MATCH Interstage matching
Connect to ground through a 1.5 nH (typical) inductor.
4
VCC1
Power supply
5
NC
Not used
Connect to ac ground, Vcc or ground (Figure 3).
6
VCC2
Power supply
Internally connected to middle stage matching network.
7
NC
Not used
Connect to ac ground, Vcc or ground (Figure 3).
8
VCC3
Power supply
Ground
9
GND2
10
ENABLE Chip enable (active high)
11
RFIN
Power amplifier input
12
GND3
Ground
13
GND4
Ground
14
GND5
Ground
15
NC
Not used
Connect to ac ground, Vcc or ground (Figure 3).
16
NC
Not used
Connect to ac ground, Vcc or ground (Figure 3).
17
GND6
Ground
18
GND7
Ground
19
GND8
Ground
20
GND9
Ground
W118
2/1/99
Conexant
3
RF106 900 MHz Power Amplifier
Specifications
Table 2 lists the absolute maximum ratings for the RF106.
Table 3 gives the electrical specifications for the RF106.
Table 2. Absolute Maximum Ratings
Parameter
Supply voltage (Vcc)
Input voltage range
Min.
(note 1)
GND
(note 1)
Power dissipation @ high output power mode
Max.
Unit
+5
V
VCC
V
400
mW
Ambient operating temperature
–10
+70
°C
Storage temperature
–40
+125
°C
Notes:
1.
Voltages are referenced to GND.
Table 3. RF106 Electrical Specifications (note 1)
Parameter
Min.
Gain variation vs. frequency (902–928 MHz)
Typ.
Max.
Units
±0.15
±0.75
dB
Peak-Envelope output Power (PEP) (note 2)
18
21
22
dBm
RF gain
26
29
30
dB
Total supply current:
Output PEP = 21 dBm
Output PEP = 11 dBm
Output PEP = 1 dBm
Standby (note 5)
95 (note 2)
40 (note 3)
30 (note 4)
<1
IM3: PEP ≤ 21 dBm
–21
mA
mA
mA
µA
–17
Output VSWR for unconditional stability
10:1
RF input return loss (902–928 MHz)
–9.5
RF output-to-input isolation @ 915 MHz
50
RF input impedance
dBc
dB
dB
Ω
50
RFOUT passband 3dB BW around 915 MHz
250
MHz
VIH for ENABLE
1.9
V
VIL for ENABLE
0.8
V
50
60
µA
IIL for ENABLE
–10
–1
0
µA
Power supply for specified performance
3.0
3.6
5.0
V
Power supply range
2.7
3.6
5.0
V
Operating temperature range
–10
25
70
°C
IIH for ENABLE
Notes:
1.
Test conditions: TA = 25 °C, VCC = 3.3V, fREF = 915 MHz
2.
With continuous wave RF input signal of –8 dBm.
3.
With continuous wave RF input signal of –18 dBm.
4.
With continuous wave RF input signal of –28 dBm.
5.
When ENABLE (pin 10) is low.
4
Conexant
W118
2/1/98
RF106 900 MHz Power Amplifier
Device Dimensions
Package dimensions for the RF106 are given in Figure 4.
See detail A
D
E
E1
E1
PIN 1 REF
e
b
SIDE VIEW
TOP VIEW
Millimeters
Dim.
A
A
A2
L
A1
DETAIL A
L1
Max.
1.20 MAX
0.10
Inches*
Min.
Max.
0.0473 MAX
A1
0.05
A2
0.90 NOM
D
6.45
6.55
0.2540 0.2580
E
6.30
6.50
0.2481 0.2560
E1
4.30
4.50
0.1694 0.1772
L
0.50
0.75
0.0020 0.0039
0.0197 0.0295
0.0354 NOM
L1
1.00 REF
0.0394 REF
e
0.65 BSC
0.0256 BSC
b
0.17
0.27
0.0067 0.0106
c
0.13
0.20
0.0051 0.0079
Coplanarity
c
Min.
0.08 MAX
0.003 MAX
Ref: 20-PIN TSSOP (GP00-D296)
*Metric values (millimeters) should be used for PCB
layout. English values (inches) are converted from
metric values and may contain round-off errors.
Figure 4. Package Dimensions – 20-pin TSSOP
Information provided by Conexant Systems, Inc. is believed to be accurate and reliable. However, no responsibility is
assumed by Conexant for its use, nor any infringement of patents or other rights of third parties which may result from its use.
No license is granted by implication or otherwise under any patent rights of Conexant other than for circuitry embodied in
Conexant products. Conexant reserves the right to change circuitry at any time without notice. This document is subject to
change without notice.
Conexant, “What’s Next in Communications Technologies” and diSSTance are trademarks of Conexant Systems, Inc.
Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered
trademarks of their respective companies. All other marks mentioned herein are the property of their respective holders.
©1999, Conexant Systems, Inc.
Printed in U.S.A.
All Rights Reserved
W118
2/1/99
Conexant
5
Further Information:
literature@conexant.com
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www.conexant.com
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