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STMicroelectronics Electronic Components Datasheet

STB7720L Datasheet

2.4-2.5 GHz Silicon Linear Power Amplifier IC

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STB7720L
2.4-2.5 GHz Silicon Linear Power Amplifier IC
FEATURES SUMMARY
EXCELLENT LINEARITY EVM 2% @ 19dBm (WITH
802.11g OFDM 54Mb/s MODULATION)
VERY LOW QUIESCENT CURRENT (60mA)
INTEGRATED LINEAR ANALOG CONTROL FOR
DC CURRENT AND OUTPUT MANAGEMENT
INTEGRATED AVERAGE CHANNEL POWER
DETECTOR
LEADLESS PACKAGE (3mmx3mm LEAD FREE)
Figure 1. Package
PRELIMINARY DATA
QFN16L (3x3)
APPLICATIONS
OPTIMIZED FOR USE IN 802.11 b/g
DESCRIPTION
The STB7720L, manufactured in the third generation of ST proprietary pure Si bipolar process, is a
three-stage linear power amplifier (PA) optimized for 802.11b/g wireless LAN (WLAN) applications in the
2.4GHz ISM band. It features 32dB of power gain and delivers 19dBm of linear output power with an EVM
degradation of only 2% under 802.11g Modulation (54Mbps).
The current consumption is as low as 125mA at 19dBm make the STB7720L a good solution for mobile
applications. It achieves less than -40dBc firstside lobe suppression and less than -52dBc secondside
lobe suppression under 802.11b modulation (11Mbps).
The device embeds a Linear Analog Control for DC current and output management and a Proprietary
Average Channel Power Detector solution. This power detector has 20dB dynamic range with 1 voltage
range and ±0.3dB accuracy under 2:1 load mismatch. It provides a buffered DC voltage proportional to
the average channel output power. Thanks to this solution we save cost and space by removing a coupler,
an op amp (usually required in a power down function) and also an integrator.
The SBT7720 is housed in QFN 3mmx3mm Leadless package.
Table 1. Order Codes
Order Codes
STB7720
Marking
7720
Package
QFN16L (3x3)
Packaging
Tape & Reel
Table 2. Absolute Maximum Ratings (Tamb = 25 oC)
Symbol
Parameter
Vcc Supply voltage
Tstb Storage temperature
Ta Operating Ambient Temperature
Pin Input Power
Table 3. Thermal Data
Rth(j-case)
Thermal Resistance Junction-Case
August 2004
Value
5.5
-55 to + 150
-30 + 85
10
Unit
V
oC
oC
dBm
TBD
REV. 1
oC/W
1/8


STMicroelectronics Electronic Components Datasheet

STB7720L Datasheet

2.4-2.5 GHz Silicon Linear Power Amplifier IC

No Preview Available !

STB7720L
Figure 2. Functional Block Diagram
V Supply
Input pre
IN Matching
Interstage
Mat c hin g
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Detected Power
Power
Detector
Interstage
Matching
Output
Matching
OUT
Bias
Network
Quiescent C urre nt Regulation
Figure 3. Pin Connection
16 15 14
13
1
TOP VIEW
2
3
4 EP (17)
567
8
Table 4. Pin Description
PIN Symbol
Function
1 nc
-
2 RFin
RF input
12
3 Vcnt
Power Control Voltage
4 Epd
Enable Power Detector
11 5 Vcc
Supply Voltage
6 VDET
Power Detector Voltage
10 7 nc
-
8 nc
9
9 nc
-
-
10 RFout
RF output
11 RFout
RF output
12 nc
-
13 nc
-
14 Vcc
Supply Voltage
15 nc
-
16 Vcc
Supply Voltage
EP GND
Ground
2/8


Part Number STB7720L
Description 2.4-2.5 GHz Silicon Linear Power Amplifier IC
Maker ST Microelectronics
Total Page 8 Pages
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