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PDF STB7720L Data sheet ( Hoja de datos )
| Número de pieza | STB7720L | |
| Descripción | 2.4-2.5 GHz Silicon Linear Power Amplifier IC | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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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
1 page  
Figure 10. Circuit Schematic
Cn1
1
2
3
4
5
CON5
VEpd
Vcnt (2.9V)
Vcc (3.3V)
+ C1
10uF
Vcc (3.3V) Vcc (3.3V)
C3
100nF
C4
10pF
C8
100nF
C9
10pF
RF IN
SMA S1
C2
1.5p Vcnt (2.9V)
VEpd
1
2
3
C5
1nF 4
NC
RFIN
Vcnt
Epd
C6
1nF
C7
1uF
Vcc (3.3V)
L1
NC 12
RFout 11
RFout 10
NC 9
ELISA01
R1
10KOhm
TP1
STB7720L
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Vcc (3.3V)
C10
100nF
C11
10pF
L2
INDUCTOR
C12
8pF
C14 1pF
C13
1.5pF
RF OUT
SMA
S2
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet STB7720L.PDF ] | |
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