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LTC5508ESC6#TR [Linear]

LTC5508 - 300MHz to 7GHz RF Power Detector with Buffered Output in SC70 Package; Package: SC70; Pins: 6; Temperature Range: -40°C to 85°C;
LTC5508ESC6#TR
型号： LTC5508ESC6#TR
厂家： Linear    Linear
描述：

LTC5508 - 300MHz to 7GHz RF Power Detector with Buffered Output in SC70 Package; Package: SC70; Pins: 6; Temperature Range: -40°C to 85°C

射频和微波 射频检测器 微波检测器
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LTC5508  
300MHz to 7GHz RF Power  
Detector with Buffered Output  
in SC70 Package  
U
FEATURES  
DESCRIPTIO  
The LTC®5508 is an RF power detector for RF applications  
operating in the 300MHz to 7GHz range. A temperature  
compensated Schottky diode peak detector and buffer  
amplifier are combined in a small SC70 package. The  
supply voltage range is optimized for operation from a  
single lithium-ion cell or 3xNiMH.  
■
Temperature Compensated Internal Schottky  
Diode RF Detector  
■
Wide Input Frequency Range: 300MHz to 7GHz  
■
Wide Input Power Range: –32dBm to 12dBm  
■
Buffered Detector Output  
■
Wide VCC Range of 2.7V to 6V  
■
Low Operating Current: 550µA  
The RF input voltage is peak detected using an on-chip  
Schottky diode. The detected voltage is buffered and  
supplied to the VOUT pin. A power saving shutdown mode  
reduces supply current to less than 2µA.  
■
Low Shutdown Current: <2µA  
■
SC70Package  
U
APPLICATIO S  
The LTC5508 operates with input power levels from  
–32dBm to 12dBm.  
■
802.11a, 802.11b, 802.11g, 802.15  
■
Multimode Mobile Phone Products  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Optical Data Links  
Wireless Data Modems  
Wireless and Cable Infrastructure  
RF Power Alarm  
Envelope Detector  
■
■
■
■
U
TYPICAL APPLICATIO  
Output Voltage vs RF Input Power  
10000  
V
A
= 3.6V  
CC  
T
= 25°C  
300MHz to 7GHz RF Power Detector  
33pF  
LTC5508  
1000  
6
2
1
4
5
3
RF  
INPUT  
V
RF  
IN  
CC  
V
CC  
2GHz  
7GHz  
100pF  
0.1µF  
GND  
GND  
1GHz  
6GHz  
4GHz  
V
OUT  
DISABLE ENABLE  
SHDN  
V
OUT  
5508 TA01  
100  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
5508 TA02  
5508fa  
1
LTC5508  
W W  
U W  
U
W
U
ABSOLUTE AXI U RATI GS  
PACKAGE/ORDER I FOR ATIO  
(Note 1)  
ORDER PART  
VCC, VOUT to GND .................................... –0.3V to 6.5V  
RFIN Voltage ......................................(VCC ± 1.3V) to 7V  
SHDN Voltage to GND ................ –0.3V to (VCC + 0.3V)  
IVOUT ...................................................................... 5mA  
Operating Temperature Range (Note 2) .. – 40°C to 85°C  
Maximum Junction Temperature ......................... 125°C  
Storage Temperature Range ................ – 65°C to 150°C  
Lead Temperature (Soldering, 10 sec)................. 300°C  
NUMBER  
TOP VIEW  
LTC5508ESC6  
SHDN 1  
GND 2  
6 RF  
IN  
5 GND  
V
3
4 V  
CC  
OUT  
SC6 PART  
MARKING  
SC6 PACKAGE  
6-LEAD PLASTIC SC70  
TJMAX = 125°C, θJA = 256°C/W  
LAAD  
Consult LTC Marketing for parts specified with wider operating temperature ranges.  
ELECTRICAL CHARACTERISTICS  
The ● denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.6V, SHDN = VCC = HI, SHDN = 0V = LO, RF Input Signal is Off,  
unless otherwise noted.  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
6
UNITS  
V
V
Operating Voltage  
Shutdown Current  
Operating Current  
●
●
●
2.7  
CC  
VCC  
VCC  
I
I
SHDN = LO  
2
µA  
SHDN = HI, I  
= 0mA  
0.55  
0.85  
400  
mA  
VOUT  
V
V
(No RF Input)  
R
= 2k, SHDN = HI, Enabled  
LOAD  
150  
1
250  
1
mV  
mV  
OUT OL  
SHDN = LOW, Disabled  
V
V
V
V
V
V
Output Current  
Enable Time  
Bandwidth  
V
= 1.75V, V = 2.7V, ∆V  
= 10mV  
= 2k  
●
●
2
8
2
mA  
µs  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
CC  
OUT  
SHDN = HI, C  
= 33pF, R  
20  
33  
LOAD  
LOAD  
C
= 33pF, R  
= 2k (Note 4)  
MHz  
pF  
LOAD  
LOAD  
Load Capacitance  
Slew Rate  
(Note 6)  
●
V
V
V
V
= 2V Step, C  
= 33pF, R = 2k (Note 3)  
LOAD  
5
2
V/µs  
RFIN  
LOAD  
Noise  
= 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination  
mV  
P-P  
CC  
CC  
CC  
SHDN Voltage, Chip Disabled  
SHDN Voltage, Chip Enabled  
SHDN Input Current  
= 2.7V to 6V  
= 2.7V to 6V  
●
●
●
0.35  
40  
V
1.4  
V
SHDN = 3.6V  
24  
300 to 7000  
–32 to 12  
150  
µA  
RF Input Frequency Range  
IN  
MHz  
dBm  
Ω
RF Input Power Range  
IN  
RF Frequency = 300MHz to 7GHz (Note 5, 6) V = 2.7V to 6V  
CC  
RF AC Input Resistance  
IN  
F = 1000MHz, Pin = –25dBm  
F = 1000MHz, Pin = –25dBm  
RF Input Shunt Capacitance  
IN  
0.6  
pF  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
Note 3: The rise time at V  
is measured between 0.5V and 1.5V.  
OUT  
of a device may be impaired.  
Note 4: Bandwidth is calculated using the 10% to 90% rise time equation:  
Note 2: Specifications over the –40°C to 85°C operating temperature  
range are assured by design, characterization and correlation with  
statistical process controls.  
BW = 0.35/rise time.  
Note 5: RF performance is tested at 1800MHz  
Note 6: Guaranteed by design.  
5508fa  
2
LTC5508  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Typical Detector Characteristics,  
2000MHz  
Typical Detector Characteristics,  
300MHz  
Typical Detector Characteristics,  
1000MHz  
10000  
1000  
100  
10000  
1000  
100  
10000  
1000  
100  
V
= 3.6V  
V
= 3.6V  
V
= 3.6V  
CC  
CC  
CC  
T
0
= 85°C  
T
= –40°C  
A
T
= –40°C  
A
T
= –40°C  
A
A
T
= 85°C  
T
= 85°C  
A
A
T
= 25°C  
A
T
= 25°C  
T
= 25°C  
A
A
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G01  
5508 G02  
5508 G03  
Typical Detector Characteristics,  
5000MHz  
Typical Detector Characteristics,  
3000MHz  
Typical Detector Characteristics,  
4000MHz  
10000  
1000  
100  
10000  
1000  
100  
10000  
1000  
100  
V
= 3.6V  
V
= 3.6V  
V
= 3.6V  
CC  
CC  
CC  
T
= –40°C  
A
T
= –40°C  
T = –40°C  
A
A
T
= 85°C  
A
T
= 85°C  
A
T
= 85°C  
A
T
= 25°C  
A
T
A
= 25°C  
T
= 25°C  
A
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G06  
5508 G04  
5508 G05  
Typical Detector Characteristics,  
6000MHz  
Typical Detector Characteristics,  
7000MHz  
10000  
1000  
100  
10000  
1000  
100  
V
= 3.6V  
V
= 3.6V  
CC  
CC  
T
= –40°C  
A
T
= –40°C  
A
T
= 85°C  
T
= 85°C  
A
A
T
= 25°C  
A
T
= 25°C  
A
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G08  
5508 G07  
5508fa  
3
LTC5508  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
VOUT Slope vs RF Input Power at  
2000MHz  
VOUT Slope vs RF Input Power at  
300MHz  
VOUT Slope vs RF Input Power at  
1000MHz  
1000  
100  
10  
1000  
100  
10  
1000  
100  
10  
V
= 3.6V  
V
CC  
= 3.6V  
V
= 3.6V  
CC  
CC  
T
= –40°C  
T
= –40°C  
T
= –40°C  
A
A
A
T
= 25°C  
T
= 25°C  
T
= 25°C  
A
A
A
T
= 85°C  
T = 85°C  
A
A
T
= 85°C  
A
1
1
1
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G09  
5508 G10  
5508 G11  
VOUT Slope vs RF Input Power at  
5000MHz  
V
OUT Slope vs RF Input Power at  
VOUT Slope vs RF Input Power at  
4000MHz  
3000MHz  
1000  
100  
10  
1000  
100  
10  
1000  
100  
10  
V
= 3.6V  
V
= 3.6V  
CC  
V
= 3.6V  
CC  
CC  
T
= –40°C  
T
= –40°C  
T = –40°C  
A
A
A
T
= 25°C  
T
= 25°C  
A
A
T
= 25°C  
A
T
= 85°C  
T
= 85°C  
T = 85°C  
A
A
A
1
1
1
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G13  
5508 G14  
5508 G12  
VOUT Slope vs RF Input Power at  
6000MHz  
VOUT Slope vs RF Input Power at  
7000MHz  
1000  
1000  
100  
10  
V
= 3.6V  
V
= 3.6V  
CC  
CC  
100  
10  
1
T
= –40°C  
A
T
= –40°C  
A
T
= 25°C  
A
T
= 25°C  
A
T
= 85°C  
T
= 85°C  
A
A
1
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
–32 –28 –24 –20 –16–12 –8 –4  
0
4
8
12  
RF INPUT POWER (dBm)  
RF INPUT POWER (dBm)  
5508 G16  
5508 G15  
5508fa  
4
LTC5508  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25°C)  
S11 Forward Reflection  
Impedance  
FREQUENCY  
(GHz)  
RESISTANCE  
REACTANCE  
(Ω)  
(Ω)  
1.000  
1.375  
1.750  
2.125  
2.500  
2.875  
3.250  
3.625  
4.000  
4.375  
4.750  
5.125  
5.500  
5.875  
6.250  
6.625  
7.000  
129.136  
100.771  
73.844  
60.159  
50.135  
43.042  
37.570  
33.924  
30.923  
28.793  
26.992  
25.717  
24.920  
24.318  
24.549  
25.273  
26.337  
–86.960  
–92.142  
–81.141  
–68.796  
–58.139  
–48.927  
–41.033  
–33.346  
–26.405  
–20.012  
–14.080  
–8.323  
–3.228  
2.177  
7.535  
12.197  
16.503  
5508 TA03  
1.000GHz-7.000GHz  
S11 Forward Reflection  
Impedance  
RFIN Input Impedance (Pin = –25dBm, VCC = 3.6V, TA = 25°C)  
FREQUENCY  
(GHz)  
RESISTANCE  
REACTANCE  
(Ω)  
(Ω)  
1.000  
1.375  
1.750  
2.125  
2.500  
2.875  
3.250  
3.625  
4.000  
4.375  
4.750  
5.125  
5.500  
5.875  
6.250  
6.625  
7.000  
114.531  
95.061  
71.491  
59.563  
51.714  
44.940  
39.708  
36.151  
33.227  
31.108  
29.514  
27.899  
27.047  
26.627  
26.760  
27.619  
28.241  
–63.267  
–71.669  
–64.607  
–54.798  
–46.844  
–39.753  
–32.738  
–26.385  
–20.478  
–15.107  
–9.941  
–4.793  
0.266  
5.250  
10.267  
14.616  
18.523  
1.000GHz-7.000GHz  
5508 TA04  
5508fa  
5
LTC5508  
U
U
U
PI FU CTIO S  
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN  
pinplacesthepartinshutdownmode.Alogichighenables  
the part. SHDN has an internal 150k pull down resistor to  
ensure that the part is in shutdown when no input is  
applied.  
VCC (Pin4):PowerSupplyVoltage, 2.7Vto6V. VCC should  
be bypassed appropriately with ceramic capacitors.  
RFIN (Pin 6): RF Input Voltage. Referenced to VCC. A  
coupling capacitor must be used to connect to the RF  
signal source. The frequency range is 300MHz to 7GHz.  
This pin has an internal 250Ω termination, an internal  
Schottky diode detector and a peak detector capacitor.  
GND (Pin 2, 5): Ground.  
V
OUT (Pin 3): Detector Output.  
W
BLOCK DIAGRA  
RF  
SOURCE  
12pF TO 200pF  
(DEPENDING ON  
APPLICATION)  
V
CC  
4
GAIN  
COMPRESSION  
+
BUFFER  
30k  
V
OUT  
3
–
SHDN  
250Ω  
6
RF  
IN  
100Ω  
100Ω  
30k  
20k  
28pF  
+
130mV  
40k  
RF DET  
20k  
–
BIAS  
60µA  
60µA  
150k  
GND  
GND  
2
5
5508 BD  
1
SHDN  
5508fa  
6
LTC5508  
U
W
U U  
APPLICATIO S I FOR ATIO  
Operation  
60mV. Below 60mV, the voltage gain from the peak  
detector to the buffer output is 4. Above 120mV, the  
voltagegainisreducedto0.85. Thecompressionexpands  
the low power detector range due to higher gain.  
The LTC5508 RF detector integrates several functions to  
provideRFpowerdetectionoverfrequenciesrangingfrom  
300MHz to 7GHz. These functions include an internally  
compensated buffer amplifier, an RF Schottky diode peak  
detector and level shift amplifier to convert the RF input  
signal to DC, a delay circuit to avoid voltage transients at  
Modes of Operation  
MODE  
SHDN  
Low  
OPERATION  
Disabled  
V
OUT when coming out of shutdown and a gain compres-  
Shutdown  
Enable  
sion circuit to extend the detector dynamic range.  
High  
Power Detect  
Buffer Amplifier  
Applications  
The buffer amplifier has a gain of two and is capable of  
driving a 2mA load. The buffer amplifier typically has an  
output voltage range of 0.25V to 1.75V.  
TheLTC5508canbeusedasaself-standingsignalstrength  
measuring receiver for a wide range of input signals from  
–32dBmto12dBmforfrequenciesfrom300MHzto7GHz.  
RF Detector  
The LTC5508 can be used as a demodulator for AM and  
ASK modulated signals with data rates up to 2MHz.  
Depending on specific application needs, the RSSI output  
can be split into two branches, providing AC-coupled data  
(or audio) output and DC-coupled, RSSI output for signal  
strength measurements and AGC.  
The internal RF Schottky diode peak detector and level  
shift amplifier converts the RF input signal to a low  
frequency signal. The detector demonstrates excellent  
efficiency and linearity over a wide range of input power.  
The Schottky detector is biased at about 60µA and drives  
a peak detector capacitor of 28pF.  
The LTC5508 can be used for RF power detection and  
control. Refer to Application Note 91, “Low Cost Coupling  
Methods for RF Power Detectors Replace Directional  
Couplers.”  
Gain Compression  
The gain compression circuit changes the feedback ratio  
as the RF peak-detected input voltage increases above  
Demo Board Schematic  
V
CC  
R3  
22k  
E4  
SHDN  
C1  
18pF  
RF  
IN  
ENABLE  
1
2
J1  
SHDN  
LTC5508  
RF  
R1  
DISABLE 3  
68Ω  
(OPT)  
JP1  
R2  
GND  
GND  
68Ω  
V
CC  
(OPT)  
E2  
E1  
E5  
V
V
V
CC  
V
OUT  
OUT  
CC  
E3  
C5  
(OPT)  
C2  
0.1µF  
C3  
100pF  
GND  
GND  
5508 AI01  
5508fa  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
7
LTC5508  
U
PACKAGE DESCRIPTIO  
SC6 Package  
6-Lead Plastic SC70  
(Reference LTC DWG # 05-08-1638)  
0.47  
MAX  
0.65  
REF  
1.80 – 2.20  
(NOTE 4)  
1.16 REF  
0.96 MIN  
INDEX AREA  
(NOTE 6)  
1.15 – 1.35  
(NOTE 4)  
1.80 – 2.40  
3.26 MAX 2.1 REF  
PIN 1  
RECOMMENDED SOLDER PAD LAYOUT  
PER IPC CALCULATOR  
0.15 – 0.30  
6 PLCS (NOTE 3)  
0.65 BSC  
0.10 – 0.40  
0.80 – 1.00  
0.00 – 0.10  
REF  
NOTE:  
1. DIMENSIONS ARE IN MILLIMETERS  
2. DRAWING NOT TO SCALE  
1.00 MAX  
3. DIMENSIONS ARE INCLUSIVE OF PLATING  
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR  
5. MOLD FLASH SHALL NOT EXCEED 0.254mm  
6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,  
BUT MUST BE LOCATED WITHIN THE INDEX AREA  
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70  
0.10 – 0.30  
SC6 SC70 0802  
0.10 – 0.18  
(NOTE 3)  
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5508fa  
LT/TP REV A 0603 1K • PRINTED IN USA  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
8
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相关型号：

SI9130DB

 5- and 3.3-V Step-Down Synchronous Converters

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SI9135LG-T1

 SMBus Multi-Output Power-Supply Controller

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SI9135LG-T1-E3

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SI9135_11

 SMBus Multi-Output Power-Supply Controller

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SI9136_11

 Multi-Output Power-Supply Controller

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SI9130CG-T1-E3

 Pin-Programmable Dual Controller - Portable PCs

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SI9130LG-T1-E3

 Pin-Programmable Dual Controller - Portable PCs

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SI9130_11

 Pin-Programmable Dual Controller - Portable PCs

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SI9137

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137DB

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137LG

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9122E

 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

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