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LTC5505-1/LTC5505-2 RF Power Detector with Buffered Output and >40dB Dynamic Range
FEATURES
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DESCRIPTIO
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Internal Schottky Diode RF Detector with Two Input Power Ranges: LTC5505-1, -28dBm to 18dBm LTC5505-2, -32dBm to 12dBm Wide Input Frequency Range: 300MHz to 3GHz (LTC5505-1); 300MHz to 3.5GHz (LTC5505-2) Temperature Compensated Buffered Detector Output Wide VCC Range of 2.7V to 6V 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 3.5GHz 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
R1 100 RF 1 2 DISABLE ENABLE 3 LTC5505-X VCC 5 RFIN GND SHDN VOUT 4 C1 0.3pF
Tx PA MODULE C2 0.1F Li-Ion CELL BAND DIPLEXER
PCS BAND
MOBILE PHONE DSP
VPC
5505 TA01
BSE
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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 (LTC5505-1) (LTC5505-2) 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 300 to 3500 -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 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)
VOUT OUTPUT VOLTAGE (mV)
1000
1000
100 0 6 -30 -24 -18 -12 -6 RF INPUT POWER (dBm)
12
5505 G01
100 -30 -24
VOUT OUTPUT VOLTAGE (mV)
LTC5505-2 Typical Detector Characteristics, 0.85GHz
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)
LTC5505-2 Typical Detector Characteristics, 2.45GHz
10000 VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C 10000
VOUT OUTPUT VOLTAGE (mV)
1000
VOUT OUTPUT VOLTAGE (mV)
100 -32
-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 10000
LTC5505-1 Typical Detector Characteristics, 2.45GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
-18 -12 -6 0 6 RF INPUT POWER (dBm)
12
5505 G02
100 0 6 -30 -24 -18 -12 -6 RF INPUT POWER (dBm)
12
5505 G03
LTC5505-2 Typical Detector Characteristics, 1.85GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
10
5505 G04
100 -32
-26
-20 -14 -8 -2 4 RF INPUT POWER (dBm)
10
5505 G05
LTC5505-2 Typical Detector Characteristics, 3.5GHz
VCC = 2.7V TO 6V 0 SERIES TERMINATION -40C 25C 85C
1000
10
5505 G06
100 -32
-26
-20 -14 -8 -2 4 RF INPUT POWER (dBm)
10
5505 G07
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LTC5505-1/LTC5505-2
PI FU CTIO S
RFIN (Pin 1): RF Input Voltage. Referenced to VCC. An external coupling capacitor to the RF source is required. 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 appropriately with ceramic capacitors.
BLOCK DIAGRA
RFIN 1 30k 100
60A GND 2
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VCC 5
GAIN COMPRESSION
+
BUFFER 4 VOUT
-
SHDN 250 30k
100 28pF
+
RF DET 130mV
-
60A 150k 22k BIAS
3 SHDN
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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 3.5GHz. 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 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 100mV. Below 100mV, the voltage gain from the peak detector to the buffer output is 1.5. Above 200mV, the
Example of LTC5505-X GSM/DCS Power Control Timing Diagram
20s SHDN 2s 28s 543s 28s
VOUT
RF INPUT POWER
5505 TD
t1
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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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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 3.5GHz. 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. The LTC5505-1 and LTC5505-2 can be used for dual band mobile phone transmitter power control (refer to Typical Application schematic on first page). The circuit uses a capacitive tap at the Tx PA outputs. For example, a 0.3pF capacitor (C1) followed by a 100 resistor (R1) forms a coupling circuit with about a 20dB loss at the cellular band and 18dB loss at the PCS band, referenced to the LTC5505-2 IC RF input pin. For improved coupling accuracy, the C1 capacitor should be a high tolerance component (0.05pF.)
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
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TYPICAL APPLICATIO U
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 TA02
Dual Band Mobile Phone Tx Power Control with Directional Coupler
900MHz INPUT 1.8GHz INPUT
DIRECTIONAL COUPLER
DIPLEXER
MOBILE PHONE DSP
VPC
PACKAGE DESCRIPTIO
0.754 0.854 0.127
3.254 0.95 BSC
1.9 BSC RECOMMENDED SOLDER PAD LAYOUT
0.20 BSC 1.00 MAX DATUM `A'
0.35 - 0.50 REF 0.09 - 0.20 (NOTE 3) 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. JEDEC PACKAGE REFERENCE IS MO-193
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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S5 Package 5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
2.90 BSC (NOTE 4) 2.80 BCS 1.50 - 1.75 (NOTE 4) PIN ONE 0.30 - 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 - 0.90 0.01 - 0.10 1.90 BSC
S5 TSOT-23 0801
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LTC5505-1/LTC5505-2
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TM
COMMENTS Up to 16 White LEDs, VIN = 1.6V to 18V, VOUT Max = 34V, IQ = 1.8mA, ISD = <1A, MS10 Monolithic Charger, Thermal Rejection Prevents Overheating, Small Design, Up to 1.5A Charge Current 50mA to 700mA Charge Current, Only Three Components for Complete Solution 95% Efficiency, VIN = 2.7V to 6V, VOUT Min = 0.8V, IQ = 10A, ISD = <1A, MS8 Up to 8 White LEDs, VIN = 1V to 10V, VOUT Max = 34V, IQ = 1.2mA, ISD = <1A, ThinSOT Up to 4 White LEDs, VIN = 2.5V to 10V, VOUT Max = 34V, IQ = 1.9mA, ISD = <1A, ThinSOT, SC70 Up to 6 White LEDs, VIN = 2.7V to 4.5V, IQ = 8mA, ISD = <1A, MS10 Up to 6 White LEDs, VIN = 2.7V to 4.5V, IQ = 6.5mA, ISD = <1A, ThinSOT Up to 6 White LEDs, VIN = 2.7V to 4.5V, IQ = 6.5mA, ISD = <1A, MS10 Up to 8 White LEDs, VIN = 2.7V to 4.5V, IQ = 5mA, ISD = <1A, MS10 95% Efficiency, VIN = 2.7V to 6V, VOUT Min = 0.8V, IQ = 10A, ISD = <1A, MS8 95% Efficiency, VIN = 2.7V to 6V, VOUT Min = 0.8V, IQ = 20A, ISD = <1A, ThinSOT 95% Efficiency, VIN = 2.5V to 5.5V, VOUT Min = 0.6V, IQ = 20A, ISD = <1A, ThinSOT 95% Efficiency, VIN = 2.5V to 5.5V, VOUT Min = 0.8V, IQ = 60A, ISD = <1A, TSSOP-16E 95% Efficiency, VIN = 2.5V to 5.5V, VOUT Min = 0.8V, IQ = 60A, ISD = <1A, MS10 95% Efficiency, VIN = 2.5V to 5.5V, VOUT Min = 2.5V, IQ = 25A, ISD = <1A, MS10 Minimum Heat Dissipation, Current Limit for Safety, Standalone Charger, Monolithic Standalone, Monolithic, 100mA/500mA or Up to 2A from Wall Adapter Replaces Power Supply ORing Diodes, High Efficiency
PowerPath is a trademark of Linear Technology Corporation.
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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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LT/TP 1102 2K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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