DC1528A Quick Start Guide Datasheet by Analog Devices Inc.

View All Related Products | Download PDF Datasheet
DEMO CIRCUIT 1528A ‘ ' I I “D QUICK START GUIDE TECHNOLOGY LTC5582 40 MHz ’ro 1OGHZ RMS Power De’reC’ror wi’rh éOdB Dynamic Range
LTC5582
1
DESCRIPTION
Demonstration circuit
1528A
is a Mean-Squared Power
Detector featuring the LTC
®
5582 IC.
The LTC5582 is a wide dynamic range Mean Squared
RF Power Detector, operational from 40MHz to 6GHz.
The input dynamic range with ±1dB nonlinearity is
60dB depending on frequency(from –58dBm to
+2dBm, single-ended 50 input). The detector output
voltage slope is normally 30mV/dB, and the typical
output variation over temperature is ±0.5dB at
2140MHz.
The DC1528A Demo Circuit is optimized for wide fre-
quency range of 40MHz to 5.5GHz. However, input
match can be optimized above 6GHz with simple ex-
ternal matching. Operating above 6GHz is possible
with reduced performance. Contact applications for
more information.
Design files for this demo board are available. Call
the LTC factory.
Typical Performance Summary (V
CC
= 3.3V, EN = 3.3V, T
A
= 25°C, unless otherwise noted. Test circuit shown in Figure 1.)
PARAMETER CONDITION VALUE
Supply Voltage 3.1V to 3.5V
Supply Current 41.6mA
Shutdown Current EN = Low 0.1µA
EN Voltage Low, Chip Disabled
HIGH, Chip Enabled
0.4V max
1V min
EN Input Current V
EN
= 0V
V
EN
= 3.3V
0µA
125µA
Output DC Voltage No Input Signal Present 0.69V
Rise Time 0.8V to 2.4V, C3 = 8nF, F
RF
= 100 MHz 90nS
Fall Time 2.4V to 0.8V, C3 = 8nF, F
RF
= 100 MHz 5uS
Input Frequency Range Operation over wider frequency range with reduced performance 40MHz to 10GHz
f = 2140MHz
RF Input Power Range CW; Single-Ended, 50Ω -56dB to 1dB
Linear Dynamic Range ±1 dB linearity error 57 dB
Slope 29.5mV/dB
Logarithmic Intercept -85dBm
Output Variation vs Temperature Normalized to Output at 25°, P
IN
= -47 to +0dBm ±0.5 dB
Deviation from CW Response 12 dB peak-to-average ratio (4 carrier WCDMA) 0.1 dB
f = 5800MHz
RF Input Power Range CW; Single-Ended, 50Ω -46dB to 3dB
Linear Dynamic Range ±1 dB linearity error 49dB
Slope 30.9mV/dB
DEMO
CIRCUIT
1528
QUICK START GUIDE
LTC
5582
40 MHz to 10GHz RMS Power Detec
tor
with 60dB Dynamic Range
LTC5582 m mum: xmmnm m | , :u mum: mm mm mmmni ,x: , m an s m ua/nlv |.n977 cm mama 1 2.1mm m > , , , - - an 521 as mm m mix mm m min mm mum mwm m1: mmm chunm 2 L7LJIJEۤP
LTC5582
2
Logarithmic Intercept -74.7
Output Variation vs Temperature Normalized to Output at 25°C, P
IN
= -46 to +2dBm ±1 dB
Deviation from CW Response 12dB Peak to Average Ratio(WiMAX OFDM) 0.2dB
QUICK START PROCEDURE
Demonstration circuit
1528
A is easy to set up to evalu-
ate the performance of the LTC5582.
Care should be
taken during
V
CC
power up, to ensure the supply voltage
transient does not exceed the absolute maximum.
Refer to
Figure 2
for measurement equipment setup
and follow the procedure below:
1. Connect voltmeter’s negative (-) lead to demo
board GND test point (TP2).
2. Connect voltmeter’s positive (+) lead to the
demo board VOUT test point (TP6).
3. Connect DC power supply’s negative (-) output
to demo board GND test point (TP2).
4. Connect DC power supply’s positive (+) output
(3.15V to 3.5V) to demo board V
CC
test point
(TP1).
5. Connect signal generator’s output to demo
board RFIN port (SMA connector J1) via coaxial
cable. An optional 3dB attenuator may be in-
serted to improve input match, the power range
will be shifted higher by 3dB.
6. Using a jumper cable, connect demo board V
CC
test point (TP1) to EN1 test point (TP3). Now
the detector is enabled (on) and is ready for
measurement.
7.
Apply RF input signal at RFIN and measure the
output DC voltage.
APPLICATION NOTES:
Absolute maximum ratings
Supply voltage…………………………….…3.8V
Enable voltage……………..…-0.3V to
V
CC
+0.3V
Input signal Power(Single-ended, 50
)…..18dBm
Input signal Power(Differential, 50
)……..24dBm
Operating Temperature Range….…-40°C to 85°C
NOTE.
For digitally modulated signals, an oscilloscope can be
used to observe the AC components of the output.
Figure 1. Standard demo board RF input return loss
LTC5582 Signal |—%‘I Eeneratnr :I—1 '— LJ MB PAD (Outlonul) —I——C + no : Pmr - - Supply . l—C . _ I _ O J —'C 4. DE Vnh . Meter .1: - Frequency(MHz) R6,RT1|kQ) R5,RT2(I
LTC5582
3
Figure2
Proper Equipment Measurement Set-Up
Temperature compensation
R5 and R6 are optional external resistors used for tem-
perature compensation. Short them to ground will dis-
able the compensation circuitry. R6 controls the 1
st
order compensation, and R5 controls the 2
nd
order
temperature compensation. Standard demo board is
optimized for the best temperature performance at
2140MHz.
Frequency(MHz)
R6,RT1(k)
R5,RT2(k)
450
12
2
800
12.4
1.4
880
12
2
2000
0
2
2140
0
2
2600
0
1.6
2700
0
1.6
3000
0
1.6
3600
0
1.6
5800
0
3
7000
10
1.43
8000
10
1.43
Table 1. Suggested R5, R6 values for optimal tempera-
ture performance at various frequencies.
‘LTC5582 “AW AH“- L7 LJU
LTC5582
4
R3 100k 1%
3.3V
TP2
GND 1
C1
1uF
R1
1.5
VCC
J1
RFIN
3.3V
U1 LTC5582IDD
VCC
1
IN+
2
DEC
3
IN-
4
GND
5OUT 6
RT2 7
RT1 8
EN 9
FLTR 10
GND
11
C2
1nF
C10
OPT
TP3
EN
1
TP1
3.1V - 3.5V
1
C5
0.4pF
C3
100nF
C9
100pF
R5
2k
R6
0
3.3V
TP6
VOUT
1
C8
1nF
R4
68.1
1%
C4
270pF

Products related to this Datasheet

EVAL BOARD FOR LTC5582IDD