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Final Electrical Specifications
LTC5505-1/LTC5505-2 RF Power Detector with Buffered Output and >40dB Dynamic Range
October 2001
FEATURES
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DESCRIPTIO
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Internal Schottky Diode RF Detector with Two Power Ranges: LTC5505-1, -28dBm to 18dBm LTC5505-2, -32dBm to 12dBm Wide Input Frequency Range: 300MHz to 3GHz Temperature Compensated Buffered Detector Output Wide VCC Range of 2.7V to 6V Allows Direct Connection to Battery Low Operating Current: 0.5mA Low Shutdown Current: <2A Low Profile (1mm) ThinSOTTM Package
The LTC(R)5505-X is an RF power detector for RF applications operating in the 300MHz to 3GHz range. A temperature compensated Schottky diode peak detector and buffer amplifier are combined in a small 5-pin ThinSOT 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 LTC5505-1 operates with input power levels from -28dBm to 18dBm. The LTC5505-2 operates with input power levels from -32dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation
APPLICATIO S
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Multimode Mobile Phone Products PCS Devices Wireless Data Modems Wireless and Cable Infrastructure RF Power Alarm Envelope Detector
TYPICAL APPLICATIO
Dual Band Mobile Phone Tx Power Control
0 TO 20 33pF 1 2 DISABLE ENABLE 3 LTC5505-X VCC 5 RFIN GND SHDN VOUT 4 0.1F Li-Ion BSEL Tx PA MODULE 900MHz OUTPUT 1.8GHz OUTPUT 50
5505 TA01
900MHz INPUT 1.8GHz INPUT
DIRECTIONAL COUPLER
MOBILE PHONE DSP
VPC
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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DIPLEXER
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LTC5505-1/LTC5505-2
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW RFIN 1 GND 2 SHDN 3 4 VOUT 5 VCC
VCC, VOUT to GND .................................... -0.3V to 6.5V RF Voltage LTC5505-1 ................................... (VCC - 2.6V) to 7V LTC5505-2 ................................... (VCC - 1.4V) 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
LTC5505-1ES5 LTC5505-2ES5 S5 PART MARKING LTXV LTRW
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 125C, JA = 250C/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 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 7) 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 0.5 170 1 260 1 2 8 4
0.75 350
20 33
10 1.4 0.35 1.4 24 40
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V V A
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LTC5505-1/LTC5505-2
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 RFIN Input Frequency Range RFIN Input Power Range (LTC5505-1) RF Frequency = 900MHz (Note 5, 6, 7) VCC = 2.7V to 6V RF Frequency = 1800MHz (Note 5, 6, 7)VCC = 2.7V to 6V RF Frequency = 2400MHz (Note 5, 7)VCC = 2.7V to 6V RF Frequency = 2700MHz (Note 5, 7)VCC = 2.7V to 6V RF Frequency = 900MHz (Note 5) RF Frequency = 1800MHz (Note 5) RF Frequency = 2400MHz (Note 5) RF Frequency = 2700MHz (Note 5) F = 850MHz F = 1850MHz F = 850MHz F = 1850MHz CONDITIONS MIN TYP 300 to 3000 -28 to 18 -26 to 18 -24 to 16 -22 to 16 -32 to 12 -32 to 12 -32 to 12 -30 to 12 165 20 2 165 59 1.3 MAX UNITS MHz dBm dBm dBm dBm dBm dBm dBm dBm pF pF
ELECTRICAL CHARACTERISTICS
RFIN Input Power Range (LTC5505-2)
RFIN AC Input Resistance (LTC5505-1) RFIN Input Shunt Capacitance (LTC5505-1) RFIN AC Input Resistance (LTC5505-2) RFIN Input Shunt Capacitance (LTC5505-2)
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, 14dBm, -14dBm (LTC5505-1) 1800MHz, 12dBm, -14dBm (LTC5505-2) Note 6: For input RF power levels >16dBm, VCC minimum is 3V and an RF input series resistor of 20 is required to limit the input current. Note 7: Guaranteed by design.
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LTC5505-1/LTC5505-2 TYPICAL PERFOR A CE CHARACTERISTICS
LTC5505-1 Typical Detector Characteristics, 0.85GHz
10000 10000 VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
VOUT OUTPUT VOLTAGE (mV)
1000
VOUT OUTPUT VOLTAGE (mV)
100 0 6 -30 -24 -18 -12 -6 RF INPUT POWER (dBm)
LTC5505-1 Typical Detector Characteristics, 2.45GHz
10000 VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C 10000
VOUT OUTPUT VOLTAGE (mV)
1000
100 0 6 -30 -24 -18 -12 -6 RF INPUT POWER (dBm)
VOUT OUTPUT VOLTAGE (mV)
LTC5505-2 Typical Detector Characteristics, 1.85GHz
10000 VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C 10000
VOUT OUTPUT VOLTAGE (mV)
1000
100 -32
VOUT OUTPUT VOLTAGE (mV)
-26
-20 -14 -8 -2 4 RF INPUT POWER (dBm)
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LTC5505-1 Typical Detector Characteristics, 1.85GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
12
5505 G01
100 -30 -24
-18 -12 -6 0 6 RF INPUT POWER (dBm)
12
5505 G02
LTC5505-2 Typical Detector Characteristics, 0.85GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
12
5505 G03
100 -32
-26
-20 -14 -8 -2 4 RF INPUT POWER (dBm)
10
5505 G04
LTC5505-2 Typical Detector Characteristics, 2.45GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
10
5505 G05
100 -32
-26
-20 -14 -8 -2 4 RF INPUT POWER (dBm)
10
5505 G06
LTC5505-1/LTC5505-2
PI FU CTIO S
RFIN (Pin 1): RF Feedback Voltage from the Directional Coupler. Referenced to VCC. A coupling capacitor of 33pF must be used to connect to the ground referenced directional coupler. The frequency range is 300MHz to 3GHz. This pin has an internal 250 termination, an internal Schottky diode detector and peak detector capacitor. (See Note 6 in the Electrical Characteristics.) GND (Pin 2): System Ground. SHDN (Pin 3): 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 the drivers are in a tri-state condition. VOUT (Pin 4): Buffered and Level Shifted Detector Output Voltage. VCC (Pin 5): Power Supply Voltage, 2.7V to 6V. VCC should be bypassed with 0.1F and 100pF ceramic capacitors.
BLOCK DIAGRA
(0 TO 20 FOR LTC5505-1, 0 FOR LTC5505-2) RFSOURCE
33pF VCC 5
RFIN
1 30k 100
60A GND 2
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GAIN COMPRESSION
+
BUFFER 4 VOUT
-
SHDN 250 30k
100 28pF
+
RF DET 130mV
-
60A 150k 22k BIAS
3 SHDN
5505 BD
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LTC5505-1/LTC5505-2
APPLICATIO S I FOR ATIO
Operation The LTC5505-X RF detector integrates several functions to provide RF power detection over frequencies ranging from 300MHz to 3GHz. These functions include an internally compensated buffer amplifier, an RF Schottky diode peak detector and level shift amplifier to convert the RF feedback 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 RF pin input resistance is typically 250 and the frequency range of this pin is 300MHz to 3GHz. 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
Example of LTC5505-X GSM/DCS Power Control Timing Diagram
20s SHDN 2s 28s 543s 28s
VOUT
RF INPUT POWER
5505 TD
t1
t2
t3
t 1: PART COMES OUT OF SHUTDOWN 20s MAXIMUM PRIOR TO BURST. t 2: CIRCUITS POWER UP AND SETTLE. t 3: BASEBAND CONTROLLER STARTS RF POWER RAMP UP AT 22s AFTER SHDN IS ASSERTED HIGH.
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100mV. Below 100mV, the voltage gain from the peak detector to the buffer output is 1.5. Above 200mV, the voltage gain is reduced to 0.7. 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 LTC5505-1 and LTC5505-2 can be used as selfstanding signal strength measuring receivers for a wide range of input signals from -32dBm to 18dBm for frequencies from 300MHz to 3GHz. The LTC5505-1 and LTC5505-2 can be used as demodulators for AM and ASK modulated signals with data rates up to 5MHz. 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. For the LTC5505-1, a resistor in the range of 0 to 20 can be placed in series with the RF input to shift the operating range to higher power. A resistor of 20 is required for GSM/DCS mobile phone Tx power control, in conjunction with a dual directional coupler at the Tx PA outputs.
t4
t5
t6
t 4: BASEBAND CONTROLLER COMPLETES RAMP UP. t 5: BASEBAND CONTROLLER STARTS RF POWER RAMP DOWN AT END OF BURST. t 6: LTC5505-X RETURNS TO SHUTDOWN MODE BETWEEN BURSTS
LTC5505-1/LTC5505-2
PACKAGE DESCRIPTIO
2.60 - 3.00 (.102 - .118)
.20 (.008) DATUM `A' A A2
L NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES)
3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEL MO-193 FOR THIN
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S5 Package 5-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1633) (Reference LTC DWG # 05-08-1635)
2.80 - 3.10 (.110 - .118) (NOTE 3) 1.50 - 1.75 (.059 - .069) (NOTE 3) PIN ONE .95 (.037) REF .25 - .50 (.010 - .020) (5PLCS, NOTE 2) .09 - .20 (.004 - .008) (NOTE 2) 1.90 (.074) REF A1
S5 SOT-23 0401
A A1 A2 L
SOT-23 (Original) .90 - 1.45 (.035 - .057) .00 - .15 (.00 - .006) .90 - 1.30 (.035 - .051) .35 - .55 (.014 - .021)
SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 - .10 (.0004 - .004) .80 - .90 (.031 - .035) .30 - .50 REF (.012 - .019 REF)
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LTC5505-1/LTC5505-2
RELATED PARTS
PART NUMBER RF Power Controllers LTC1757A LTC1758 LTC1957 LTC4400 LTC4401 Other Related Parts LTC1503 LTC1555L-1.8 LT 1615 LT1617 LTC1682 LT1761 LTC1878 LTC1928 LT1932 LT1944 LTC1986 LTC3200 LTC3401 LTC3402 LTC3404
(R)
DESCRIPTION RF Power Controller RF Power Controller RF Power Controller SOT-23 RF PA Controller SOT-23 RF PA Controller Inductorless Step-Down DC/DC Converter SIM Power Supply and Level Translator Step-Up DC/DC Converter Inverting DC/DC Converter Low Noise Charge Pump with LDO Low Dropout, Low Noise Linear Regulator Step-Down DC/DC Converter Low Noise Charge Pump White LED Driver Step-Up DC/DC Converter SIM Power Supply Low Noise Charge Pump Step-Up DC/DC Converter Step-Up DC/DC Converter Step-Down DC/DC Converter
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 600kHz, Up to 100mA, 25% Higher Efficiency than Linear Regulator Generates 1.8V, 3V or 5V; >10kV ESD on All SIM Contact Pins ThinSOT, Low 20A Quiescent Current, VIN as Low as 1V, 300mA IOUT ThinSOT, Low 20A Quiescent Current, VIN as Low as 1V, 300mA IOUT 60VRMS Output Noise, Small MSOP Package ThinSOT, 300mV Dropout at 100mA, 20VRMS Output Noise (10Hz to 100kHz) Integrated Synchronous Operation, Up to 95% Efficiency, 1A Switch Current ThinSOT, 90VRMS Output Noise (100kHz BW), IOUT Up to 30mA ThinSOT, 1.2MHz DC/DC Constant-Current LED Driver, Dimming Control Dual Output for LCD Bias, Low Quiescent Current of 20A, 1.2V VIN 15V ThinSOT, 3V and 5V, Ultralow Supply Current of 14A, <0.92cm2 PCB 2MHz Switching Frequency Allows Small Size Capacitors, IOUT Up to 100mA Synchronous Rectification, Up to 97% Efficiency, 1A Switch Current, 3MHz Synchronous Rectification, Up to 97% Efficiency, 2A Switch Current, 3MHz 1.4MHz Synchronous Rectification, 10A Quiescent Current
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
5505i LT/TP 1001 1.5K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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