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0.1GHz to 3GHz, 75dB Logarithmic
Detector/Controller
Detailed Description
The MAX2015 is a successive detection logarithmic
amplifier designed for use in RF power measurement
and AGC applications with a 0.1GHz to 3GHz
frequency range from a single 2.7V to 3.6V power
supply. It is pin compatible with other leading logarith-
mic amplifiers.
The MAX2015 provides for improved performance with a
high 75dB dynamic range at 100MHz, and exceptional
accuracy over the extended temperature range and sup-
ply voltage range.
RF Input
The MAX2015 differential RF input (INHI, INLO) allows
for broadband signals between 100MHz and 3GHz. For
single-ended signals, AC-couple INLO to ground. The
RF inputs are internally biased and need to be AC-cou-
pled using 680pF capacitors as shown in Figure 1 and
Figure 2. An internal 50 ? resistor between INHI and
INLO provides a good 50MHz to 3.0GHz match.
SET Input
Applications Information
Detector (RSSI) Mode
In detector mode, the MAX2015 acts like an RSSI,
which provides an output voltage proportional to the
input power. This is accomplished by providing a feed-
back path from OUT to SET (R1 = 0 ? ; see Figure 1).
By connecting SET directly to OUT, the op amp gain is
set to 2V/V due to two internal 20k ? feedback resistors.
This provides a detector slope of approximately
18mV/dB with a 0.5V to 1.8V output range.
Controller Mode
The MAX2015 can also be used as a detector/controller
within an AGC loop. Figure 3 depicts one scenario
where the MAX2015 is employed as the controller for a
variable-gain PA. As shown in the figure, the MAX2015
monitors the output of the PA through a directional cou-
pler. An internal integrator (Figure 2) compares the
V S
The SET input is used for loop control when in controller
mode or to set the slope of the output signal (mV/dB)
when in detector mode. The internal input structure of
SET is two series 20k ? resistors connected to ground.
R4
C6
C5
1
V CC
The center node of the resistors is fed to the negative
input of the internal output op amp.
Power-Supply Connections
RFIN
C1
2
DETECTORS
INHI
20k ?
OUT 8
SET 7
OUT
The MAX2015 requires power-supply bypass capacitors
R1
connected close to each V CC pin. At each V CC pin,
connect a 0.1μF capacitor (C4, C6) and a 100pF capac-
C2
3
INLO
20k ?
GND
6
itor (C3, C5) with the 100pF capacitor being closest to
the pin.
For power-supply voltages (V S ) between 2.7V and 3.6V,
set R4 = 0 ? (see the typical applications circuits).
C4
C3
4
V CC
MAX2015
PWDN
5
For power-supply voltages (V S ) between 4.75V and
5.25V, set R4 = 75 ? ±1% (100ppm/°C max) and PWDN
must be connected to GND.
Power-Down Mode
Figure 1. Detector-Mode (RSSI) Typical Application Circuit
Table 1. Suggested Components of
The MAX2015 can be powered down by driving PWDN
with logic high (logic high = V CC ). In power-down
mode, the supply current is reduced to a typical value
Typical Applications Circuits
DESIGNATION VALUE
TYPE
of 1μA. For normal operation, drive PWDN with a logic
low. It is recommended when using power-down that
an RF signal not be applied before the power-down
signal is low.
C1, C2
C3, C5
C4, C6
R1*
R4**
680pF
100pF
0.1μF
0 ?
0 ?
0603 ceramic capacitors
0603 ceramic capacitors
0603 ceramic capacitors
0603 resistor
0603 resistor
* RSSI mode only.
** V S = 2.7V to 3.6V.
8
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