TriQuint Semiconductor Inc TQ3631 Datasheet
WIRELESS COMMUNICATIONS DIVISION
Control
Logic
C2
C2
L1
VDD
TQ3631
DATA SHEET
GND
RF
IN
LNA
gnd
GND
RF
OUT
C3
50 ohm
RF Out
Control
Logic
Product Description
The TQ3631 is a 3V, RF LNA IC designed specifically for PCS band CDMA
applications. It’s RF performance meets the requirements of products designed to
the IS-95 specifications. The TQ3631 is designed to be used with the TQ5631
(CDMA mixer) which provides a complete CDMA receiver for 1900MHz phones.
The LNA incorporates on-chip switches which determine high, low and bypass mode
select. When used with the TQ5631 (CDMA RFA/mixer), four gain steps are
available for use which provide low current/high IP3 and gain. The RF output port is
internally matched to 50
of external components. The TQ3631 achieves excellent RF performance with low
current consumption, supporting long standby and talk times in portable applications.
Coupled with the very small SOT23-8 package, the part is ideally suited for PCS
band mobile phones.
Ω
, greatly simplifying the design and minimizing the number
3V PCS Band CDMA
LNA IC
Features
Small size: SOT23-8
Single 3V operation
Low-current operation
Gain Select
High IP3 performance
Few external components
Applications
IS-95 CDMA PCS Mobile Phones
Electrical Specifications
Parameter Min Typ Max Units
Frequency 1960 MHz
Gain 13.0 dB
Noise Figure 1.5 dB
Input 3rd Order Intercept 10.0 dBm
DC supply Current 11.0 mA
Note 1: Test Conditions: Vdd=2.8 V, RF=1960MHz, Tc=25C, CDMA High Gain state.
For additional information and latest specifications, see our website: www.triquint.com 1
1
TQ3631
Data Sheet
Electrical Characteristics
Parameter Conditions Min. Typ/Nom Max. Units
RF Frequency PCS band 1810 1960 1990 MHz
CDMA Mode-High Gain
Gain 12.0 13.0 dB
Noise Figure 1.5 2.2 dB
Input IP3 7.0 10.0 dBm
Input Return Loss (with external matching) 10 dB
Output Return Loss 10 dB
Supply Current 11.0 13.0 mA
CDMA Mode-High Gain-Low Linearity
Gain 10.0 11.5 dB
Noise Figure 1.6 2.8 dB
Input IP3 2.0 5.0 dBm
Input Return Loss (with external matching) 10 dB
Output Return Loss 10 dB
Supply Current 4.5 5.5 mA
Bypass Mode
Gain -2.5 -1.5 dB
Noise Figure 2.0 2.8 dB
Input IP3 30.0 dBm
Input Return Loss (with external matching) 10 dB
Output Return Loss 10 dB
Supply Current 1.0 2.0 mA
Supply Voltage 2.7 2.8 3.3 V
Note 1: Test Conditi ons: Vdd=2.8 V, RF=1960MHz, TC = 25° C, unless otherwise specified.
°
Note 2: Min/Max limits are at +25
C case temperature, unless otherwise specified.
Absolute Maximum Ratings
Parameter Value Units
DC Power Supply 5.0 V
Power Dissipation 500 mW
Operating Temperature -40 to 85 C
Storage Temperature -60 to 150 C
Signal level on inputs/outputs +20 dBm
Voltage to any non supply pin +0.3 V
2 For additional information and latest specifications, see our website: www.triquint.com
Typical Performance
Test Conditions, unless Otherwise Spec ified: Vdd=2.8V, Tc=25C, RF=1960MHz
TQ3631
Data Sheet
CDMA High Gain Mode
Gain v Freq v Temp
15.0
14.5
14.0
13.5
13.0
12.5
Gain (dB)
12.0
11.5
11.0
10.5
-30C
+25C
+85C
10.0
1920 1940 1960 1980 2000
Frequency (MHz)
CDMA High Gain Mode
IIP3 v Freq v Temp
10.0
9.5
9.0
8.5
IIP3 (dBm)
8.0
7.5
-30C
+25C
+85C
7.0
1920 1940 1960 1980 2000
Frequency (MHz)
CDMA High Gain Mode
Idd v Vdd v Temp
13.00
12.00
11.00
10.00
9.00
Idd (mA)
8.00
7.00
6.00
2.5 2.7 2.9 3.1 3.3
Vdd (V)
High Gain/Low Linearity Mode
Gain v Freq v Temp
13.0
12.5
12.0
11.5
11.0
10.5
Gain (dB)
10.0
9.5
9.0
8.5
8.0
1920 1940 1960 1980 2000
Frequency (MHz)
-30C
+25C
+85C
-30C
+25C
+85C
CDMA High Gain Mode
Noise Figure v Freq v Temp
2.00
1.80
1.60
1.40
1.20
1.00
0.80
Noise Figure (dB)
0.60
0.40
0.20
-30C
+25C
+85C
0.00
1920 1940 1960 1980 2000
Frequency (MHz)
For additional information and latest specifications, see our website: www.triquint.com 3
High Gain/Low Linearity Mode
IIP3 v Freq v Temp
5.0
4.8
4.6
4.4
4.2
4.0
3.8
IIP3 (dBm)
3.6
3.4
3.2
-30C
+25C
+85C
3.0
1920 1940 1960 1980 2000
Frequency (MHz)
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