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LTC5508 300MHz to 7GHz RF Power Detector with Buffered Output in SC70 Package
FEATURES
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DESCRIPTIO
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: 550A Low Shutdown Current: <2A SC70 Package
The LTC(R)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. 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 2A. The LTC5508 operates with input power levels from -32dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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802.11a, 802.11b, 802.11g, 802.15 Multimode Mobile Phone Products Optical Data Links Wireless Data Modems Wireless and Cable Infrastructure RF Power Alarm Envelope Detector
TYPICAL APPLICATIO
Output Voltage vs RF Input Power
10000 VCC = 3.6V TA = 25C
RF INPUT
33pF 6 2
LTC5508 VCC 4 RFIN GND SHDN GND 5 100pF
VCC 0.1F
VOUT OUTPUT VOLTAGE (mV)
300MHz to 7GHz RF Power Detector
1000 2GHz 1GHz 4GHz 6GHz 7GHz
DISABLE ENABLE
1
VOUT 3 VOUT
5508 TA01
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
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8 12
5508 TA02
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LTC5508
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW SHDN 1 GND 2 VOUT 3 6 RFIN 5 GND 4 VCC
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) .. - 40C to 85C Maximum Junction Temperature ......................... 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
LTC5508ESC6 SC6 PART MARKING LAAD
SC6 PACKAGE 6-LEAD PLASTIC SC70
TJMAX = 125C, JA = 256C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 3.6V, SHDN = VCC = HI, SHDN = 0V = LO, RF Input Signal is Off, unless otherwise noted.
PARAMETER VCC Operating Voltage IVCC Shutdown Current IVCC Operating Current VOUT VOL (No RF Input) VOUT Output Current VOUT Enable Time VOUT Bandwidth VOUT Load Capacitance VOUT Slew Rate VOUT Noise SHDN Voltage, Chip Disabled SHDN Voltage, Chip Enabled SHDN Input Current RFIN Input Frequency Range RFIN Input Power Range RFIN AC Input Resistance RFIN Input Shunt Capacitance RF Frequency = 300MHz to 7GHz (Note 5, 6) VCC = 2.7V to 6V F = 1000MHz, Pin = -25dBm F = 1000MHz, Pin = -25dBm SHDN = LO SHDN = HI, IVOUT = 0mA RLOAD = 2k, SHDN = HI, Enabled SHDN = LOW, Disabled VOUT = 1.75V, VCC = 2.7V, VOUT = 10mV SHDN = HI, CLOAD = 33pF, RLOAD = 2k CLOAD = 33pF, RLOAD = 2k (Note 4) (Note 6) VRFIN = 2V Step, CLOAD = 33pF, RLOAD = 2k (Note 3) VCC = 3V, Noise BW = 1.5MHz, 50 RF Input Termination VCC = 2.7V to 6V VCC = 2.7V to 6V SHDN = 3.6V
q q q q q q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
q q q
TYP
MAX 6 2
UNITS V A mA mV mV mA s MHz pF V/s mVP-P
2.7 0.55 150 1 250 1 2 8 2
0.85 400
20 33
5 2 0.35 1.4 24 300 to 7000 -32 to 12 150 0.6 40
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: The rise time at VOUT is measured between 0.5V and 1.5V. Note 4: Bandwidth is calculated using the 10% to 90% rise time equation: BW = 0.35/rise time. Note 5: RF performance is tested at 1800MHz Note 6: Guaranteed by design.
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V V A MHz dBm pF
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LTC5508 TYPICAL PERFOR A CE CHARACTERISTICS
Typical Detector Characteristics, 300MHz
10000 VCC = 3.6V 10000
VOUT OUTPUT VOLTAGE (mV)
VOUT OUTPUT VOLTAGE (mV)
1000 TA = -40C TA = 85C TA = 25C
1000 TA = -40C TA = 25C TA = 85C
VOUT OUTPUT VOLTAGE (mV)
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
Typical Detector Characteristics, 3000MHz
10000 VCC = 3.6V 10000
VOUT OUTPUT VOLTAGE (mV)
VOUT OUTPUT VOLTAGE (mV)
1000 TA = -40C TA = 85C
1000 TA = -40C TA = 85C
VOUT OUTPUT VOLTAGE (mV)
TA = 25C 100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
Typical Detector Characteristics, 6000MHz
10000 VCC = 3.6V
10000
VOUT OUTPUT VOLTAGE (mV)
1000 TA = -40C TA = 85C
VOUT OUTPUT VOLTAGE (mV)
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
UW
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5508 G01
5508 G04
Typical Detector Characteristics, 1000MHz
VCC = 3.6V 10000
Typical Detector Characteristics, 2000MHz
VCC = 3.6V
1000 TA = -40C TA = 85C TA = 25C
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G02
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G03
Typical Detector Characteristics, 4000MHz
VCC = 3.6V 10000
Typical Detector Characteristics, 5000MHz
VCC = 3.6V
1000 TA = -40C TA = 85C
TA = 25C 100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
TA = 25C
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5508 G05
100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G06
Typical Detector Characteristics, 7000MHz
VCC = 3.6V
1000 TA = -40C TA = 85C TA = 25C 100 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
TA = 25C
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5508 G07
8 12
5508 G08
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LTC5508 TYPICAL PERFOR A CE CHARACTERISTICS
VOUT Slope vs RF Input Power at 300MHz
1000 VCC = 3.6V
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
100
VOUT SLOPE (mV/dB)
10 TA = -40C TA = 25C TA = 85C 1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm) 8 12
5508 G09
VOUT Slope vs RF Input Power at 3000MHz
1000 VCC = 3.6V
1000
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
100
VOUT SLOPE (mV/dB)
TA = -40C 10 TA = 25C TA = 85C 1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm) 8 12
5508 G12
VOUT Slope vs RF Input Power at 6000MHz
1000 VCC = 3.6V
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
10
TA = -40C TA = 25C TA = 85C
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
4
UW
VOUT Slope vs RF Input Power at 1000MHz
1000 VCC = 3.6V
1000
VOUT Slope vs RF Input Power at 2000MHz
VCC = 3.6V
100
10
TA = -40C TA = 25C TA = 85C
10
TA = -40C TA = 25C TA = 85C
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G10
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G11
VOUT Slope vs RF Input Power at 4000MHz
VCC = 3.6V 1000
VOUT Slope vs RF Input Power at 5000MHz
VCC = 3.6V
100
10
TA = -40C TA = 25C TA = 85C
10
TA = -40C TA = 25C TA = 85C
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G13
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G14
VOUT Slope vs RF Input Power at 7000MHz
1000 VCC = 3.6V
100
10
TA = -40C TA = 25C TA = 85C
8 12
5508 G15
1 -32 -28 -24 -20 -16 -12 -8 -4 0 4 RF INPUT POWER (dBm)
8 12
5508 G16
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LTC5508 TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 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 RESISTANCE () 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 REACTANCE () -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
RFIN Input Impedance (Pin = -25dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 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 RESISTANCE () 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 REACTANCE () -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
UW
S11 Forward Reflection Impedance
1.000GHz-7.000GHz
5508 TA03
S11 Forward Reflection Impedance
1.000GHz-7.000GHz
5508 TA04
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LTC5508
PI FU CTIO S
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN pin places the part in shutdown mode. A logic high enables the part. SHDN has an internal 150k pull down resistor to ensure that the part is in shutdown when no input is applied. GND (Pin 2, 5): Ground. VOUT (Pin 3): Detector Output. VCC (Pin 4): Power Supply Voltage, 2.7V to 6V. 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 250 termination, an internal Schottky diode detector and a peak detector capacitor.
BLOCK DIAGRA
RFSOURCE
12pF TO 200pF (DEPENDING ON APPLICATION)
RFIN
6 30k 100
GND 2 GND 5 1 SHDN
5508 BD
6
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VCC 4
GAIN COMPRESSION
+
BUFFER 3 VOUT
-
SHDN 250 30k
20k 28pF 20k
100
+
RF DET 130mV
-
40k 150k BIAS
60A
60A
5508fa
LTC5508
APPLICATIO S I FOR ATIO
Operation The LTC5508 RF detector integrates several functions to provide RF power detection over frequencies ranging from 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 VOUT when coming out of shutdown and a gain compression circuit to extend the detector dynamic range. Buffer Amplifier 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. RF Detector 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 60A and drives a peak detector capacitor of 28pF. Gain Compression The gain compression circuit changes the feedback ratio as the RF peak-detected input voltage increases above
VCC R3 22k C1 18pF SHDN RF LTC5508 JP1 VOUT GND E2 E3 R2 68 (OPT) C5 (OPT) GND VOUT GND VCC C2 0.1F C3 100pF E5 GND
5508 AI01
E4 SHDN ENABLE 1 2 DISABLE 3
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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60mV. Below 60mV, the voltage gain from the peak detector to the buffer output is 4. Above 120mV, the voltage gain is reduced to 0.85. The compression expands the low power detector range due to higher gain. Modes of Operation
MODE Shutdown Enable SHDN Low High OPERATION Disabled Power Detect
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Applications The LTC5508 can be used as a self-standing signal strength measuring receiver for a wide range of input signals from -32dBm to 12dBm for frequencies from 300MHz to 7GHz. 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 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."
Demo Board Schematic
RFIN J1 R1 68 (OPT)
VCC
E1 VCC
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LTC5508
PACKAGE DESCRIPTIO
0.47 MAX
0.65 REF
1.16 REF
3.26 MAX 2.1 REF
0.96 MIN
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.10 - 0.40
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 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
RELATED PARTS
PART NUMBER LTC1757A LTC1758 LTC1957 LTC4400 LTC4401 LT5500 LT5502 LT5503 LT5504 LTC5505 LT5506 LTC5507 LT5511 LT5512 DESCRIPTION RF Power Controller RF Power Controller RF Power Controller SOT-23 RF PA Controller SOT-23 RF PA Controller 1.8GHz to 2.7GHz RF Front End 400MHz Quadrature Demodulator with RSSI 1.2GHz to 2.7GHz Direct IQ Modulator and Up Converting Mixer 800MHz to 2.7GHz RF Measuring Receiver 300MHz to 3.5GHz RF Power Detector 500MHz Quadrature IF Demodulator with VGA 100kHz to 1GHz RF Power Detector High Signal Level Up Converting Mixer High Signal Level Down Converting Mixer COMMENTS Single/Dual Band GSM/DCS/GPRS Mobile Phones Single/Dual Band GSM/DCS/GPRS Mobile Phones Single/Dual Band GSM/DCS/GPRS Mobile Phones Single/Dual Band GSM/DCS/GPRS Phones, 45dB Dynamic Range, 450kHz Loop BW Single/Dual Band GSM/DCS/GPRS Phones, 45dB Dynamic Range, 250kHz Loop BW Dual LNA gain Setting +13.5dB/-14dB at 2.5GHz, Double-Balanced Mixer, 1.8V VSUPPLY 5.25V 1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain, 90dB RSSI Range 1.8V to 5.25V Supply, Four-Step RF Power Control, 120MHz Modulation Bandwidth 80dB Dynamic Range, Temperature Compensated, 2.7V to 5.5V Supply >40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply 1.8V to 5.25V Supply, 40MHz to 500MHz IF, -4dB to 57dB Linear Power Gain 48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer DC-3GHz, 20dBm IIP3, Integrated LO Buffer
5508fa LT/TP REV A 0603 1K * PRINTED IN USA
RF Power Controllers
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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SC6 Package 6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
1.80 - 2.20 (NOTE 4) 1.80 - 2.40 1.15 - 1.35 (NOTE 4) INDEX AREA (NOTE 6) PIN 1 0.65 BSC 0.15 - 0.30 6 PLCS (NOTE 3) 0.80 - 1.00 0.00 - 0.10 REF 1.00 MAX 0.10 - 0.30 0.10 - 0.18 (NOTE 3)
SC6 SC70 0802
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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