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PDF MAX2016 Data sheet ( Hoja de datos )
| Número de pieza | MAX2016 | |
| Descripción | LF-to-2.5GHz Dual Logarithmic Detector/ Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3404; Rev 0; 9/04
EVAALVUAAILTAIOBNLEKIT
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
General Description
The MAX2016 dual logarithmic detector/controller is a
fully integrated system designed for measuring and
comparing power, gain/loss, and voltage standing-wave
ratio (VSWR) of two incoming RF signals. An internal
broadband impedance match on the two differential RF
input ports allows for the simultaneous monitoring of sig-
nals ranging from low frequency to 2.5GHz.
The MAX2016 uses a pair of logarithmic amplifiers to
detect and compare the power levels of two RF input
signals. The device internally subtracts one power level
from the other to provide a DC output voltage that is pro-
portional to the power difference (gain). The MAX2016
can also measure the return loss/VSWR of an RF signal
by monitoring the incident and reflected power levels
associated with any given load. A window detector is
easily implemented by using the on-chip comparators,
OR gate, and 2V reference. This combination of circuitry
provides an automatic indication of when the measured
gain is outside a programmable range. Alarm monitoring
can thus be implemented for detecting high-VSWR
states (such as open or shorted loads).
The MAX2016 operates from a single +2.7V to +5.25V*
power supply and is specified over the extended -40°C
to +85°C temperature range. The MAX2016 is available
in a space-saving, 5mm x 5mm, 28-pin thin QFN.
Applications
Return Loss/VSWR Measurements
Dual-Channel RF Power Measurements
Dual-Channel Precision AGC/RF Power Control
Log Ratio Function for RF Signals
Remote System Monitoring and Diagnostics
Cellular Base Station, Microwave Link, Radar,
and other Military Applications
RF/IF Power Amplifier (PA) Linearization
Typical Application Circuit appears at end of data sheet.
Features
♦ Complete Gain and VSWR Detector/Controller
♦ Dual-Channel RF Power Detector/Controller
♦ Low-Frequency to 2.5GHz Frequency Range
♦ Exceptional Accuracy Over Temperature
♦ High 80dB Dynamic Range
♦ 2.7V to 5.25V Supply Voltage Range*
♦ Internal 2V Reference
♦ Scaling Stable Over Supply and Temperature
Variations
♦ Controller Mode with Error Output
♦ Available in 5mm x 5mm 28-Pin Thin QFN
Package
*See Power-Supply Connection section.
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX2016ETI
-40°C to +85°C
28 Thin QFN-EP*,
bulk
T2855-3
MAX2016ETI-T
-40°C to +85°C
28 Thin QFN-EP*, T2855-3
T/R
MAX2016ETI+D
-40°C to +85°C
28 Thin QFN-EP*,
lead free, bulk
T2855-3
MAX2016ETI+TD
-40°C to +85°C
28 Thin QFN-EP*,
lead free, T/R
T2855-3
*EP = Exposed pad.
+ = Lead free.
D = Dry pack.
Pin Configuration
28 27 26 25 24 23 22
FA1 1
VCC 2
RFINA+ 3
RFINA- 4
GND 5
COUTH 6
CSETH 7
MAX2016
21 FB1
20 VCC
19 RFINB+
18 RFINB-
17 GND
16 COUTL
15 CSETL
8 9 10 11 12 13 14
THIN QFN
________________________________________________________________ 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.
1 page  
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
AC ELECTRICAL CHARACTERISTICS—OUTD (continued)
(Typical Application Circuit, VCC = +2.7V to +3.3V, R1 = R2 = R3 = 0Ω, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VCC = 3.3V, CSETL = CSETH = VCC, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Large-Signal Rise and Fall Time
±1dB Dynamic Range
Slope
OUTD Voltage Deviation
Any 30dB step, no external capacitor on
pins FV1 and FV2
0.1GHz
PRFINB = -32dBm
0.9GHz
PRFINB = -30dBm
1.9GHz
PRFINB = -27dBm
2.17GHz
PRFINB = -25dBm
2.5GHz
PRFINB = -23dBm
fRF = 0.1GHz to 2.5GHz
PRFINA = PRFINB = -30dBm, TA =
-20°C to +85°C
35
80
75
60
55
50
25
±0.25
ns
dB
mV/dB
dB
0.1GHz, PRFINB =
-32dBm
80
±1dB Dynamic Range over
Temperature Relative to Best-Fit
Curve at +25°C
PRFINA is swept ;
TA = -20°C to
+85°C
0.9GHz, PRFINB =
-30dBm
1.9GHz, PRFINB =
-27dBm
2.17GHz, PRFINB =
-25dBm
70
55 dB
50
2.5GHz, PRFINB =
-23dBm
45
Gain Measurement Balance
Channel Isolation
PRFINB = PRFINB = -50dBm to -5dBm, fRF =
1.9GHz
0.9GHz
1.9GHz
2.5GHz
0.2
90
65
55
dB
dB
Note 1: The MAX2016 is tested at TA = +25°C and is guaranteed by design for TA = -40°C to +85°C.
Note 2: Typical minimum and maximum range of the detector at the stated frequency.
Note 3: Dynamic range refers to the range over which the error remains within the ±3dB range.
Note 4: The slope is the variation of the output voltage per change in input power. It is calculated by fitting a root-mean-square
straight line to the data indicated by the RF input power range.
Note 5: The intercept is an extrapolated value that corresponds to the output power for which the output voltage is zero. It is calcu-
lated by fitting a root-mean-square straight line to the data.
_______________________________________________________________________________________ 5
5 Page 
LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
Table 1. Component Values Used in the Typical Application Circuit
DESIGNATION
C1, C2, C8, C9
C3, C6, C10, C13
C4, C7, C11, C14
C5, C12, C15
C18
R1, R2, R3
R6
VALUE
680pF
33pF
0.1µF
Not used
10µF
0Ω
0Ω
37.4Ω
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 VS = 2.7V to 3.6V
±1% resistor (1206) for VS = 4.75V to 5.25V
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 50Ω 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 (R1 = R2 = 0Ω).
The input power level can be determined by the follow-
ing equation:
PRFIN_
=
VOUT _
SLOPE
+ PINT
where PINT 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 =
0Ω). The difference of the input power levels (gain) can
be determined by the following equation:
PRFINA
−
PRFINB
=
(VOUTD − VCENTER)
SLOPE
where VCENTER is the output voltage, typically 1V, when
PRFINA = PRFINB.
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.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX2016.PDF ] | |
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