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PDF LTC5582 Data sheet ( Hoja de datos )
| Número de pieza | LTC5582 | |
| Descripción | 40MHz to 10GHz RMS Power Detector | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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1. LTC5582  Hay una vista previa y un enlace de descarga de LTC5582 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LTC5582www.DataSheet4U.com
40MHz to 10GHz
RMS Power Detector with
57dB Dynamic Range
Features
n Frequency Range: 40MHz to 10GHz
n Linear Dynamic Range: Up to 57dB
n Accurate RMS Power Measurement of High Crest
Factor Modulated Waveforms
n Exceptional Accuracy Over Temperature: ±0.5dB (Typ)
n Low Linearity Error within Dynamic Range
n Single-Ended or Differential RF Inputs
n Fast Response Time: 90ns Rise Time
n Low Supply Current: 41.6mA at 3.3V (Typ)
n Small 3mm × 3mm DFN10
Applications
n RMS Power Measurement
n PA Power Control
n Receive and Transmit Gain Control
n LTE, WiMAX, W-CDMA, CDMA2K, TD-SCDMA,
EDGE Basestations
n Point-to-Point Microwave Links
n RF Instrumentation
Description
The LTC®5582 is a 40MHz to 10GHz RMS responding power
detector. It is capable of accurate power measurement
of an AC signal with wide dynamic range, from –60dBm
to 2dBm depending on frequency. The power of the AC
signal in an equivalent decibel-scaled value is precisely
converted into DC voltage on a linear scale, independent of
the crest factor of the input signal waveforms. The LTC5582
is suitable for precision RF power measurement and level
control for a wide variety of RF standards, including LTE,
WiMAX, W-CDMA, CDMA2000, TD-SCDMA, and EDGE.
The DC output is buffered with a low output impedance
amplifier capable of driving a high capacitance load. Con-
sult factory for more information. The part is packaged in
a 10-lead 3mm × 3mm DFN. It is pin-to-pin compatible
with the LT5570.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7262661, 7317357, 7622981.
Typical Application
40MHz to 6GHz RMS Power Detector
1µF 1nF
270pF 68Ω
1nF
VCC FLTR
IN+ EN
LTC5582
DEC RT1
IN– RT2
GND
OUT
5582 TA01a
3.3V
100nF
ENABLE
VOUT
Linearity Error vs RF Input Power
2140MHz Modulated Waveforms
3 TA = 25°C
2
1
0
–1
–2
–3
–65
4-CARRIER WCDMA
CW
3-CARRIER CDMA2K
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 TAO1b
5582f
1 page  
LTC5582www.DataSheet4U.com
Typical Performance Characteristics
noted. Test circuits shown in Figure 1.
VCC = 3.3V, EN = 3.3V, TA = 25°C unless otherwise
Output Voltage, Linearity Error vs
RF Input Power, 450MHz
2.8 Rt1 = 12k
Rt2 = 2k
2.4
3
2
Output Voltage Temperature
Variation from 25°C, 450MHz
3 Rt1 = 12k
Rt2 = 2k
2
Linear Error vs RF Input Power,
Modulated Waveforms, 450MHz
3 TA = 25°C
2
2.0 1 1
1
TA = 85°C
1.6 0 0
0
TA = –40°C
1.2 –1 –1
–1
0.8
0.4
–65
TA = 85°C
TA = 25°C
TA = –40°C
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–2
–3
–5 5
5582 G03
–2
–3
–65
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G04
–2
–3
–65
4-CARRIER WCDMA
CW
3-CARRIER CDMA2K
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G05
Output Voltage, Linearity Error vs
RF Input Power, 880MHz
2.8 Rt1 = 12k 3
Rt2 = 2k
2.4 2
2.0 1
1.6 0
1.2 –1
0.8
0.4
–65
TA = 85°C
TA = 25°C
TA = –40°C
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–2
–3
–5 5
5582 G06
Output Voltage Temperature
Variation from 25°C, 880MHz
3 Rt1 = 12k
Rt2 = 2k
2
1
TA = 85°C
0
TA = –40°C
–1
–2
–3
–65
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G07
Linear Error vs RF Input Power,
Modulated Waveforms, 880MHz
3 TA = 25°C
2
1
0
–1
–2
–3
–65
4-CARRIER WCDMA
CW
3-CARRIER CDMA2K
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G08
Output Voltage, Linearity Error vs
RF Input Power, 2140MHz
2.8 Rt1 = 0
3
Rt2 = 2k
2.4 2
2.0 1
1.6 0
1.2 –1
0.8
0.4
–65
TA = 85°C
TA = 25°C
TA = –40°C
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–2
–3
–5 5
5582 G09
Output Voltage Temperature
Variation from 25°C, 2140MHz
3 Rt1 = 0
Rt2 = 2k
2
1
TA = 85°C
0 TA = –40°C
–1
–2
–3
–65
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G10
Linear Error vs RF Input Power,
Modulated Waveforms, 2140MHz
3 TA = 25°C
2
1
0
–1
–2
–3
–65
4-CARRIER WCDMA
CW
3-CARRIER CDMA2K
–55 –45 –35 –25 –15
RF INPUT POWER (dBm)
–5 5
5582 G11
5582f
5 Page 
LTC5582www.DataSheet4U.com
Applications Information
while the overall dynamic range remains the same. At
high frequency, additional LC elements may be needed
for the input impedance matching due to the parasitics
of the transformer and PCB traces.
J1
RF INPUT
LTC5582
2 IN+
3 DEC
T1
1:8
4 IN–
VCC
200Ω
50pF
200Ω
RF INPUT
MATCHING NETWORK
CS1
6.8pF
CS2
6.8pF
LM
66nH
TO IN+
TO IN–
5582 F05
Figure 5. Single-Ended-to-Differential Conversion
0
–5
–10
Figure 4. Differential Input Configuration
5582 F04
Due to the high input impedance of the LTC5582, a narrow
band L-C matching network can be also used to convert a
single-ended input to differential signal as shown in Figure
5. By this means, the sensitivity and overall linear dynamic
range of the detector will be very similar to the one using 1:8
RF input balun. The conversion gain is strongly dependent
on the loss (or Q) of the matching network, particularly at
high frequency. The lower the Q, the lower the conversion
gain. However, the matching bandwidth is correspondingly
wider. The following formulas are provided to calculate the
input matching network for single-ended-to-differential
conversion at low RF frequency (i.e., below 1GHz).
CS1 = CS2 = πfc
1 2.25 • 109
50RIN = fc
(pF)
LM =
50RIN
2πfc
=
2.25 • 1010
fc
(nH)
where RIN is the differential input resistance (400Ω) and
fc is the center RF operating frequency.
As an example, Figure 6 shows that good input return
loss is achieved from 300MHz to 400MHz when Cs1= Cs2
= 6.8pF and LM = 66nH. Figure 7 show the sensitivity is
also improved by 8dB at 350MHz while the dynamic range
remains the same.
–15
–20
–25
–30
0
100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
5582 F06
Figure 6. RF Input Return Loss
2.8
2.4 SINGLE-ENDED-TO-
DIFFERENTIAL INPUTS
2.0
1.6
SINGLE-ENDED
1.2
0.8
0.4
–75 –65 –55 –45 –35 –25 –15 –5 5
RF INPUT POWER (dBm)
5582 F07
Figure 7. Output Voltage vs RF Input Power
Although these equations give a good starting point,
it is usually necessary to adjust the component values
after building and testing the circuit. As the RF operating
frequency increases, the real values of CS1, CS2, LM will
deviate from the above equations due to parasitics of the
components, device and PCB layout.
For a 50Ω input termination, the approximate RF input
power range of the LTC5582 is from –60dBm to 2dBm,
5582f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC5582.PDF ] | |
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