STB7720 ST Microelectronics, Inc., STB7720 Datasheet

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STB7720

Manufacturer Part Number
STB7720
Description
2.4-2.5 GHz Silicon Linear Power Amplifier IC
Manufacturer
ST Microelectronics, Inc.
Datasheet
FEATURES SUMMARY
• EXCELLENT LINEARITY EVM 2% @ 19dBm (WITH
• VERY LOW QUIESCENT CURRENT (60mA)
• INTEGRATED LINEAR ANALOG CONTROL FOR
• INTEGRATED AVERAGE CHANNEL POWER
• LEADLESS PACKAGE (3mmx3mm LEAD FREE)
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
Table 2. Absolute Maximum Ratings (T
Table 3. Thermal Data
August 2004
R
802.11g OFDM 54Mb/s MODULATION)
DC CURRENT AND OUTPUT MANAGEMENT
DETECTOR
Symbol
th(j-case)
T
V
P
T
stb
cc
Order Codes
a
in
STB7720
Supply voltage
Storage temperature
Operating Ambient Temperature
Input Power
Thermal Resistance Junction-Case
2.4-2.5 GHz Silicon Linear Power Amplifier IC
Marking
7720
Parameter
amb
= 25
o
C)
Figure 1. Package
QFN16L (3x3)
Package
QFN16L (3x3)
-55 to + 150
-30 + 85
Value
TBD
5.5
10
STB7720L
PRELIMINARY DATA
Tape & Reel
Packaging
REV. 1
o
dBm
Unit
C/W
o
o
V
C
C
1/8

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STB7720 Summary of contents

Page 1

... 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 ...

Page 2

... STB7720L Figure 2. Functional Block Diagram V Supply V Supply Input pre Input pre IN IN Matching Matching Figure 3. Pin Connection TOP VIEW (17 2/8 Detected Power Detected Power Interstage Interstage Interstage Interstage Matching Matching Matching Matching Bias Bias Network Network ...

Page 3

... Measured from Device On signal turn on to the point where RF Pout stabilizes to 0.5dB =3.3V, f=2.45GHz, Vcnt = 2.9V) amd cc Test Conditions dBm out dBm out P = 19dBm, 1st Side Lobe out P = 19dBm, 2nd Side Lobe out Load VSWR 10:1 STB7720L Min. Typ. Max. Unit 2.4 2.45 2.5 GHz 3.0 3.3 3.6 V 125 dBm -/+ 0.5 dB -/+ 0 ...

Page 4

... STB7720L TYPICAL PERFORMANCE Figure 4. Supply Current Vs Output Power 275 250 225 200 175 150 125 100 Pout (dBm) Figure 6. Power Gain Vs Output Power 40 Temp. depend -30 ° =+85 ° Pout (dBm) Figure 8 ...

Page 5

... VEpd Vcc (3.3V) Vcc (3.3V 100nF 100nF C4 C9 10pF 10pF RFIN RFout 3 10 Vcnt RFout C5 1nF 4 9 Epd NC ELISA01 C6 1nF C7 1uF Vcc (3.3V) R1 10KOhm TP1 STB7720L Vcc (3.3V) C10 100nF C11 10pF L2 INDUCTOR RF OUT C12 C13 8pF SMA C14 1pF 1.5pF S2 5/8 ...

Page 6

... STB7720L PACKAGE MECHANICAL Table 6. Mechanical Data - Leadless PACKAGE Exposed Pad (3mm x 3mm) DIM. MIN Figure 11. Package Dimensions 6/8 mm TYP. 0.90 0.02 0.20 REF 0.23 3.00 BSC 1.45 3.00 BSC 1.45 0.50 BSC 0. MAX 1.00 0.05 0.30 1.55 1.55 0.50 ...

Page 7

... REVISION HISTORY Table 7. Revision History Date Revision 2 August 2004 1 First Release Description of Changes STB7720L 7/8 ...

Page 8

... STB7720L Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for 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 or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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