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參數(shù)資料
| 型號(hào)： | MAX2016ETI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | LF-to-2.5GHz Dual Logarithmic Detector/ Controller for Power, Gain, and VSWR Measurements |
| 中文描述： | DUAL LOG OR ANTILOG AMPLIFIER, 22 MHz BAND WIDTH, QCC28 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD, TQFN-28 |
| 文件頁(yè)數(shù)： | 11/19頁(yè) |
| 文件大?。?/td> | 405K |
| 代理商： | MAX2016ETI |
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M
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
______________________________________________________________________________________
11
The differential RF inputs allow for the measurement of
broadband signals ranging from low frequency to
2.5GHz. For single-ended signals, RFINA- and RFINB-
are AC-coupled to ground. The RF inputs are internally
biased and need to be AC-coupled. Using 680pF
capacitors, as shown in the
Typical Application Circuit
,
results in a 10MHz highpass corner frequency. An
internal 50
resistor between RFINA+ and RFINA- (as
well as RFINB+ and RFINB-) produces a good low-fre-
quency to 3.0GHz match.
SETA, SETB, and SETD Inputs
The SET_ inputs are used for loop control when the
device is in controller mode. Likewise, these same
SET_ inputs are used to set the slope of the output sig-
nal (mV/dB) when the MAX2016 is in detector mode.
The center node of the internal resistor-divider is fed to
the negative input of the power detector’s internal out-
put op amp.
Reference
The MAX2016 has an on-chip 2V voltage reference.
The internal reference output is connected to REF. The
output can be used as a reference voltage source for
the comparators or other components and can source
up to 2mA.
OUTA and OUTB
Each OUT_ is a DC voltage proportional to the RF input
power level. The change of OUT_ with respect to the
power input is approximately 18mV/dB (R
1
= R
2
= 0
).
The input power level can be determined by the follow-
ing equation:
where P
INT
is the extrapolated intercept point of where
the output voltage intersects the horizontal axis.
OUTD
OUTD is a DC voltage proportional to the difference of
the input RF power levels. The change of the OUTD
with respect to the power difference is 25mV/dB (R3 =
0
). The difference of the input power levels (gain) can
be determined by the following equation:
where V
CENTER
is the output voltage, typically 1V, when
P
RFINA
= P
RFINB
.
Applications Information
Monitoring VSWR and Return Loss
The MAX2016 can be used to measure the VSWR of an
RF signal, which is useful for detecting the presence or
absence of a properly loaded termination, such as an
antenna (see Figure 1). The transmitted wave from the
power amplifier is coupled to RFINA and to the anten-
na. The reflected wave from the antenna is connected
to RFINB through a circulator. When the antenna is
missing or damaged, a mismatch in the nominal load
impedance results, leading to an increase in reflected
power and subsequent change in the transmission
line’s VSWR. This increase in reflected power is mani-
fested by a reduction in the voltage at OUTD. An alarm
condition can be set by using the low comparator out-
put (COUTL) as shown in Figure 1. The comparator
automatically senses the change in VSWR, yielding a
logic 0 as it compares OUTD to a low DC voltage at
CSETL. CSETL, in turn, is set by using the internal refer-
ence voltage and an external resistor-divider network.
Figure 1 illustrates a simple level detector. For window-
detector implementation, see the
Comparator/Window
Detector
section.
P
P
V
V
SLOPE
RFINA
RFINB
OUTD
CENTER
=
(
)
P
V
SLOPE
P
RFIN
OUT
INT
_
_
=
+
DESIGNATION
C1, C2, C8, C9
C3, C6, C10, C13
C4, C7, C11, C14
C5, C12, C15
C18
R1, R2, R3
VALUE
680pF
33pF
0.1μF
Not used
10μF
0
0
37.4
DESCRIPTION
Microwave capacitors (0402)
Microwave capacitors (0402)
Microwave capacitors (0603)
Capacitors are optional for frequency compensation
Tantalum capacitor (C case)
Resistors (0402)
Resistor (1206) for V
S
= 2.7V to 3.6V
±1% resistor (1206) for V
S
= 4.75V to 5.25V
R6
Table 1. Component Values Used in the Typical Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2016ETI+ | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
| MAX2016ETI+D | 制造商:Maxim Integrated Products 功能描述:DUAL LOGARITHMIC DETECTOR/CNTRLR 28TQFN EP - Rail/Tube |
| MAX2016ETI+T | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
| MAX2016ETI+TD | 制造商:Maxim Integrated Products 功能描述:DUAL LOGARITHMIC DETECTOR/CNTRLR TQFN EP - Tape and Reel |
| MAX2016ETI-T | 功能描述:射頻檢測(cè)器 LF-2.5GHz Dual Log Detector/Controller RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
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