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MAX2091
50MHz to 500MHz Analog VGA, 1735MHz to 1935MHz
Upconverting Mixer with Image Filtering, Threshold
Alarm Circuit, and Error Amplifier for Level Control
2.5dB PAD
IF_IN
-25dBm
TO +5dBm
38dB
MAX2091
LO
40dB
MAX2092
ALARM
RF_OUT
-20.5dBm
TO +5dBm
IF
ALARM
OUT
THRESHOLDS
RF
ALARM
OUT
IF PLVLSET
(ANALOG CONTROL)
INPUT FROM
EXTERNAL
ALARM
THRESHOLD
RF PLVLSET
(ANALOG CONTROL)
INPUT
FROM EXTERNAL
DETECTOR
Figure 1. Cascaded IF-RF Lineup Using the MAX2091 and MAX2092
DETECTOR
Closed-ALC Mode Operation
Closed-ALC mode operation consists of setting CTRL1
= CTRL2 = logic 1. The voltage on PLVLSET is set
externally to provide -3dBm at RF_OUT for IF_IN power
between -25dBm and +5dBm. For other input power
ranges, PLVLSET can be externally driven to any DC
value between 0 and 2.5V, such that the desired output
power is present at RF_OUT (see the Typical Application
Circuit ). An error amplifier compares the external detec-
tor’s voltage to that of PLVLSET, and drives the IF attenu-
ator in servo fashion until the error amplifier’s differential
input error voltage is near zero. The servo loop acts to
maintain the input power level to the mixer as the power
level at IF_IN changes. Ideally, a detector with an output
voltage range of 0.1V to 2.4V DC is recommended, but
the MAX2091 can operate with any detector whose out-
put ranges from 0 to 2.5V DC (with the coupling network
at IF_OUT already taken into account).
When used in conjunction with the MAX2092 RF VGA, a
nominal RF signal level of approximately -3dBm output
from the MAX2091 is recommended. With this specific
level setting, the complete MAX2091 and MAX2092 cas-
cade can yield a constant RF output power of at least
-20.5dBm to +5dBm over an IF input power range of
-25dBm to +5dBm. See Figure 1 for details. Contact
the factory for additional details surrounding Maxim’s
MAX2091 and MAX2092 reference design.
C ontrol Inputs
The MAX2091 has four control inputs: CTRL1, CTRL2,
ALM_THRES, and PLVLSET. VCC must be present
before voltages are applied to these pins. In cases where
this is not possible, a 200 I resistor must be included in
series with the control inputs to limit on-chip ESD diode
conduction. CTRL1 and CTRL2 are 3V logic controls and
cannot be driven from 5V logic. In the case where no
logic control is available and a logic-high is required, a
voltage-divider can be used from the 5V VCC supply to
produce the 3V logic-high.
VGA Output Pad
As shown in Figure 1 and the Typical Application Circuit ,
provisions have been made to allow for the placement of
a Tee attenuator between the VGA output and the mixer
input. A default value of 2.5dB is used within the applica-
tion circuit, although any desired value can be chosen.
Alternatively, the attenuator can be replaced by a sim-
ple equalizer circuit if additional frequency gain-slope
correction is desired over wider bands of operation.
25
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MAX2092ETP+T 功能描述:射频放大器 700-2700Mhz VGA Power Detector RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX209C/D 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装:
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