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參數(shù)資料
| 型號： | LTC5583IUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-X, QFN-24 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大小： | 1136K |
| 代理商： | LTC5583IUF#TRPBF |
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LTC5583
18
5583fa
APPLICATIONS INFORMATION
The LTC5583 is a dual-channel true RMS power detector,
capable of measuring two RF signals over the frequency
range from 40MHz to 6GHz, independent of input wave-
forms with different crest factors such as CW, CDMA2K,
WCDMA, LTE and WiMAX signals. Up to 60dB dynamic
range is achieved with very stable output over the full
temperature range from –40°C to 85°C. Input sensitivity
can be as low as –56dBm up to 2.7GHz even with single-
ended 50Ω input termination.
RF Inputs
The differential RF inputs are internally biased at 1.6V.
The differential impedance is about 400Ω. These pins
should be DC blocked when connected to ground or other
matching components.
The LTC5583 can be driven in a single-ended configuration.
The single-ended input impedance vs frequency is given
in Table 1. Figure 4 shows the simplified circuit of this
single-ended configuration for each channel. The DECA
pin can be either left floating or AC-coupled to ground
via an external capacitor. While the RF signal is applied
to the IN+A (or IN–A) pin, the other pin, IN–A (or IN+A),
should be AC-coupled to ground. By simply terminating
the signal side of the inputs with a 75Ω resistor in front
of the AC-blocking capacitor and coupling the other side
to ground using a 1nF capacitor, a broadband 50Ω input
match can be achieved with typical input return loss better
than 14dB from 40MHz to 2.7GHz. At higher RF frequen-
cies, additional matching components may be needed.
Contact LTC Applications for more information.
Table 1. Single-Ended Input Impedance
FREQUENCY
(MHz)
INPUT
IMPEDANCE (Ω)
S11
MAG
ANGLE (°)
40
207.4 – j15.5
0.613
–2.2
100
193.0 – j34.0
0.599
–5.4
200
188.9 – j56.8
0.611
–8.9
400
151.6 – j68.7
0.576
–15.2
600
127.8 – j62.8
0.530
–19.5
800
107.6 – j66.0
0.513
–26.2
1000
96.1 – j61.5
0.485
–30.3
1200
85.6 – j59.2
0.467
–35.4
1400
76.2 – j57.4
0.455
–41.0
1600
67.7 – j55.0
0.445
–47.1
1800
60.4 – j52.0
0.435
–53.5
2000
54.9 – j48.7
0.423
–59.4
2200
50.3 – j45.6
0.414
–65.2
2400
46.5 – j42.7
0.406
–70.8
2600
43.7 – j39.8
0.396
–76.0
2800
41.6 – j37.0
0.384
–80.8
3000
40.2 – j34.5
0.371
–84.9
3200
39.3 – j32.0
0.356
–88.8
3400
37.8 – j30.1
0.350
–93.1
3600
35.6 – j26.4
0.336
–101.5
3800
35.0 – j23.3
0.314
–107.4
4000
34.4 – j19.8
0.291
–115.0
4200
33.6 – j16.7
0.275
–123.2
4400
32.9 – j14.2
0.264
–130.6
4600
31.7 – j11.1
0.260
–141.0
4800
30.5 – j8.0
0.261
–152.0
5000
29.3 – j5.1
0.268
–162.5
5200
28.0 – j2.1
0.283
–173.0
5400
26.7 + j0.5
0.304
178.4
5600
25.4 + j2.7
0.328
171.7
5800
24.2 + j4.8
0.353
165.8
6000
23.1 + j6.6
0.377
161.1
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