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Low-Cost, Low-Voltage, PA Power Control
Amplifier for GSM Applications
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 2.7V to 6.5V, SHDN > 2.4V, MAX4473 test circuit, RG1 = RG2 = 1k Ω ±1%, RG3 = 2.5k Ω ±1%, R SENSE = 100 Ω ±1%,
R L = 10k Ω , C L = 300pF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = 6.0V, V PC = 1.0V, T A = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Swing
R L = 10 Ω to V CC / 2
R L = 500 Ω to V CC / 2
0.15
0.5
V CC -
0.15
V CC -
0.5
V
Output Current Limit
Gain-Bandwidth Product
Phase Margin
Slew Rate
V OUT = V CC / 2
R L = 10 Ω , C L = 300pF, f o = 10kHz
R L = 10 Ω , C L = 300pF
Measured from 30% to 70% of V OUT ,
R L = 10 Ω , C L = 300pF
20
2
60
1.8
mA
MHz
degrees
V/μs
Capacitive-Load Stability
Enable/Disable Time
No sustained oscillations (Note 3)
From 50% of SHDN edge to V OUT = 1V, V PC = 2V
0
0.9
300
1.5
pF
μs
GAIN CONTROL BUFFER AND V-TO-I CONVERTER
PC Input Bias Current
GND < V PC < V CC - 0.15V
±0.04
±1
μA
SR3 Output Current Limit
V PC < 2.55V, SR1 = SR2 = V CC
0.750
4
mA
V PC to VRG1 Ratio
PC Input Bandwidth
Measure voltage across RG1,
0.3V < V PC < 2.55V (Note 4)
Bandwidth from V PC to V RG1
0.095
0.1
2
0.105
V/V
MHz
Note 1: Limits over temperature are guaranteed by design.
Note 2: No output phase-reversal for input common-mode voltage range from GND to V CC . Common-mode range limited by voltage
drop across Q1 and RG3.
Note 3: Guaranteed by design.
Note 4: Error dependent on tolerance of RG1, RG2, and RG3. Specified with 0.1% tolerance resistors.
_______________________________________________________________________________________
3
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