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MAX2245 데이터시트 PDF




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부품번호 MAX2245 기능
기능 22dBm/20dBm Power Amplifiers
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MAX2245 데이터시트, 핀배열, 회로
19-2204; Rev 2; 8/03
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
General Description
The MAX2244/MAX2245/MAX2246 single-supply, low-
voltage power amplifiers (PAs) are designed for 20dBm
Bluetooth™ Class 1 applications in the 2.4GHz to 2.5GHz
band. The MAX2244/MAX2245 deliver a peak output
power of 22dBm with greater than 20dB output-power
control range. The 22dBm output power compensates for
the filter loss between the PA and the antenna, allowing
20dBm to be delivered to the antenna. The MAX2246 pro-
vides a peak output power of 20dBm for a 30% reduction
in supply current.
The PAs integrate a power detector and closed-loop
power-control circuitry to provide nearly constant output
power over the full range of supply voltage, temperature,
and input power level. The voltage at the analog control
input precisely controls the output power level.
The MAX2244/MAX2245/MAX2246 feature a low-current
shutdown mode through a simple logic input. Internal cir-
cuitry automatically controls the ramp-up/down of the
output power level during turn-on and turn-off to meet
Bluetooth spurious emissions requirements.
The devices operate from a 3V to 3.6V single supply.
The MAX2244/MAX2246 have a power-control voltage
range of 0.5V to 2V, and the MAX2245 has a control
voltage range of 0.9V to 2.2V. The devices are pack-
aged in a miniature ultra chip-scale package (UCSP™),
significantly reducing the required board area.
Applications
Bluetooth Class 1 Radios
802.11 FHSS/HomeRF™ Radios
2.4GHz Cordless Phones
SHUTDOWN
BIAS
VCC1
C2
Features
o 2.4GHz to 2.5GHz Operation
o Accurate Closed-Loop Output Power Control
Over Full Temperature, Supply, and Input Power
Range
o Convenient Analog Power-Control Interface
o 22dBm Peak Output Power (MAX2244/MAX2245)
o 20dBm Peak Output with 30% Reduced Supply
Current (MAX2246)
o Internal Bandwidth-Limited Power Ramping
o 50Integrated Input Match
o 0.5µA Shutdown Supply Current
o Ultra Chip-Scale Package (1.56mm 1.56mm)
Ordering Information
PART
TEMP
RANGE
BUMP
PACKAGE
TOP
MARK
MAX2244EBL-T -40°C to +85°C 9 UCSP*-9
AAP
MAX2245EBL-T -40°C to +85°C 9 UCSP*-9
AAQ
MAX2246EBL-T -40°C to +85°C 9 UCSP*-9
AAY
*UCSP reliability is integrally linked to the user's assembly
methods, circuit board material, and environment. See the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
Pin Configuration appears at end of data sheet.
Functional Diagram
VCC2
A2
RFIN/ B1
SHDN
MATCH
MATCH
MATCH
B3 RFOUT
MAX2244
MAX2245
MAX2246
CONTROL
AMP
POWER
DETECTOR
PC A1
ANALOG
INTERFACE
C3 C1
GND GND
B2
GND
A3
GND
Bluetooth is a trademark of Ericsson Corp.
UCSP is a trademark of Maxim Integrated Products, Inc.
HomeRF is a trademark of The HomeRF Working Group.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.




MAX2245 pdf, 반도체, 판매, 대치품
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
Typical Operating Characteristics
(Typical Application Circuit, VCC = 3V, PRFIN = 2dBm, fRFIN = 2.45GHz, SHDN = VCC, TA = +25°C, unless otherwise noted.)
MAX2244
OUTPUT POWER vs. POWER CONTROL (VPC)
20
TA = +85°C
10
0
TA = +25°C
-10 TA = -40°C
-20
0
0.5 1.0 1.5 2.0 2.5
VPC (V)
MAX2244
OUTPUT POWER vs. FREQUENCY
25
VPC = 2.0V
20
VPC = 1.0V
15
10
VPC = 0.5V
5
MAX2244
OUTPUT POWER vs. POWER CONTROL (VPC)
20
VCC = 4V
10 VCC = 3V
MAX2244 SUPPLY CURRENT
vs. POWER CONTROL (VPC)
200
150 TA = +85°C
0
-10
VCC = 5.0V
-20
0
0.5 1.0 1.5 2.0 2.5
VPC (V)
MAX2244
OUTPUT POWER vs. INPUT POWER
25
VPC = 2V
20
VPC = 1V
15
10
VPC = 0.5V
5
100
TA = +25°C
TA = -40°C
50
0
0 0.5 1.0 1.5 2.0 2.5
VPC (V)
MAX2244
HARMONIC OUTPUT SPECTRUM
VPC = 2V
0dBm
10dB/div
5fO
fO 2fO 3fO 4fO
0
2.40
2.42 2.44 2.46 2.48
FREQUENCY (GHz)
2.50
0
-15
-10 -5
0
INPUT POWER (dBm)
5
0.1
FREQUENCY (GHz)
MAX2244
FSK MODULATED OUTPUT SPECTRUM
VPC = 2V
0dBm
10dB/div
MAX2244
POWER-ON/OFF CHARACTERISTICS
30 MAX2244-46 toc08
PRFOUT
20
5
10
VSHDN
0
-10
4
3
VSHDN (V)
2
-20 1
-30 0
2.45GHz
0.5MHz/div
-40
TIME (2µs/div)
13
4 _______________________________________________________________________________________

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MAX2245 전자부품, 판매, 대치품
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
PIN
A1
A2
A3, B2, C1, C3
B1
B3
C2
NAME
PC
VCC2
GND
RFIN/SHDN
RFOUT
VCC1
Pin Description
DESCRIPTION
Power-Control Voltage Input. Adjust PC between 0.5V and 2V (MAX2244/MAX2246) or 0.9V to
2.2V (MAX2245) to adjust output power. Drive PC below 0.3V to shut down the control loop
and put the device in standby mode.
DC Supply-Voltage Connection for the 2nd Stage
Ground Connection. Connect to the PC board ground plane. Provide inductance connection
as low as is practical to the ground plane.
RF Input and Digital Shutdown Control Input. RF path internally DC-blocked and matched to
50. Digital shutdown path is connected to the bias circuitry through a resistor.
PA Open-Collector Output. Requires external pullup inductance for VCC bias and external
matching network for optimum output power and efficiency.
DC Supply-Voltage Connection for the 1st Stage, Bias, and Control Circuitry
Detailed Description
The MAX2244/MAX2245/MAX2246 are nonlinear PAs
guaranteed to operate over a 2.4GHz to 2.5GHz fre-
quency range from a 3V to 3.6V single supply. The
MAX2244/MAX2245 provide 22dBm output power, and
the MAX2246 provides 20dBm output power at the
highest power setting. The signal path consists of three
amplifier stages: an input amplifier stage with
adjustable gain, and two fixed-gain amplifier stages.
The PAs have a dual-function input (RFIN/SHDN) for
the RF input signal and shutdown control. The shut-
down function is controlled with CMOS level signals,
with a logic low putting the PA into low-current shut-
down. The RF input is internally matched to 50, elimi-
nating the need for external matching.
The MAX2244/MAX2245/MAX2246 have interstage
matching to optimize output power and efficiency. The last
amplifier stage is open collector using an external pullup
inductor or RF choke. The output match for the PAs also
acts as a lowpass filter that attenuates harmonics.
These PAs provide closed-loop power control to pro-
vide a stable output power with variations in tempera-
ture, VCC, and RF input power. The control amplifier
varies the gain of the first stage to equalize the power-
control voltage and the internal power-detector output.
The MAX2244/MAX2246 have a 0.5V to 2V power-con-
trol voltage range, and the MAX2245 has a 0.9V to 2.2V
power-control voltage range.
The internal bias circuit provides separate bias volt-
ages and currents to the amplifier stages. An internal
lowpass RC filter isolates the bias currents, preventing
them from being corrupted by the RF signals. The bias
circuit design also ensures the stability of the PA when
connected to high VSWR loads over all power levels.
Applications Information
Power-Supply Connections
The MAX2244/MAX2245/MAX2246 are designed to oper-
ate from a single, positive supply voltage (VCC) with three
connections made to VCC: VCC1, VCC2, and RFOUT bias.
Join the VCC traces together using a star layout, which
reduces crosstalk and promotes stable operation. At the
common point of the star, connect 10µF and 10nF de-
coupling capacitors to ground to reduce noise and handle
current transients. Additionally, each leg requires a high-
frequency bypass capacitor and a 1nF power-supply
decoupling capacitor near the IC.
High-frequency bypass capacitors are required close
to the IC. For VCC1, connect a capacitor approximately
1mm from the VCC1 pad. The distance of the capacitor
from the pad affects the impedance at VCC1, which
affects output power of the first stage. For optimal out-
put power from stage 1, VCC1 requires 0.3nH to 0.4nH
inductance.
The output power of the second stage is affected by the
impedance presented to VCC2, which is controlled by
the distance between the VCC2 pad and its bypass
capacitor. For optimal electrical distance, see Figure 1
and Table 1.
RFOUT must be pulled up to VCC through an inductor
or an inductive transmission line. If using a transmission
line, a high-frequency bypass capacitor from VCC to
ground is necessary to terminate the transmission line
and set its electrical length. The inductance formed by
the length of the transmission line is part of the output-
matching network, and therefore is critical. See the
Output Matching section for more information on
RFOUT requirements.
_______________________________________________________________________________________ 7

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