LTC5508 300MHz to 7GHz RF Power Detector with Buffered Output in SC70 Package FEATURES DESCRIPTIOU n Temperature Compensated Internal Schottky The LTC®5508 is an RF power detector for RF applications Diode RF Detector operating in the 300MHz to 7GHz range. A temperature n Wide Input Frequency Range: 300MHz to 7GHz compensated Schottky diode peak detector and buffer n Wide Input Power Range: –32dBm to 12dBm amplifier are combined in a small SC70 package. The n Buffered Detector Output supply voltage range is optimized for operation from a n Wide V Range of 2.7V to 6V single lithium-ion cell or 3xNiMH. CC n Low Operating Current: 550m A The RF input voltage is peak detected using an on-chip n Low Shutdown Current: <2m A Schottky diode. The detected voltage is buffered and n SC70 Package supplied to the V pin. A power saving shutdown mode OUT reduces supply current to less than 2m A. APPLICATIOU S The LTC5508 operates with input power levels from –32dBm to 12dBm. n 802.11a, 802.11b, 802.11g, 802.15 n Multimode Mobile Phone Products n Optical Data Links , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Data Modems n Wireless and Cable Infrastructure n RF Power Alarm n Envelope Detector TYPICAL APPLICATIOU Output Voltage vs RF Input Power 10000 VCC = 3.6V TA = 25°C 300MHz to 7GHz RF Power Detector V) m E ( G A 33pF LTC5508 OLT INPURTF 6 RFIN VCC 4 VCC PUT V1000 2GHz 7GHz DISABLE ENABLE 21 GSHNDDN VGONUDT 53 VOUT 100pF 0.1µF V OUTOUT 1GHz 4GHz 6GHz 5508 TA01 100 –32–28–24–20–16–12 –8 –4 0 4 8 12 RF INPUT POWER (dBm) 5508 TA02 5508fa 1

LTC5508 ABSOLUTE WAXIWUW RATIUGS PACKAGE/ORDER IUFORWATIOU (Note 1) ORDER PART V , V to GND.................................... –0.3V to 6.5V CC OUT NUMBER RF Voltage ......................................(V – 1.3V) to 7V IN CC TOP VIEW SHDN Voltage to GND ................ –0.3V to (V + 0.3V) LTC5508ESC6 CC I ...................................................................... 5mA SHDN 1 6 RFIN VOUT GND 2 5 GND Operating Temperature Range (Note 2)..–40(cid:176) C to 85(cid:176) C VOUT 3 4 VCC Maximum Junction Temperature......................... 125(cid:176) C SC6 PART Storage Temperature Range................ –65(cid:176) C to 150(cid:176) C SC6 PACKAGE MARKING 6-LEAD PLASTIC SC70 Lead Temperature (Soldering, 10 sec)................. 300(cid:176) C TJMAX = 125(cid:176)C, q JA = 256(cid:176)C/W LAAD Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25(cid:176) C. V = 3.6V, SHDN = V = HI, SHDN = 0V = LO, RF Input Signal is Off, A CC CC unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Voltage l 2.7 6 V CC I Shutdown Current SHDN = LO l 2 m A VCC I Operating Current SHDN = HI, I = 0mA l 0.55 0.85 mA VCC VOUT V V (No RF Input) R = 2k, SHDN = HI, Enabled 150 250 400 mV OUT OL LOAD SHDN = LOW, Disabled 1 mV V Output Current V = 1.75V, V = 2.7V, D V = 10mV l 1 2 mA OUT OUT CC OUT V Enable Time SHDN = HI, C = 33pF, R = 2k l 8 20 m s OUT LOAD LOAD V Bandwidth C = 33pF, R = 2k (Note 4) 2 MHz OUT LOAD LOAD V Load Capacitance (Note 6) l 33 pF OUT V Slew Rate V = 2V Step, C = 33pF, R = 2k (Note 3) 5 V/m s OUT RFIN LOAD LOAD V Noise V = 3V, Noise BW = 1.5MHz, 50W RF Input Termination 2 mV OUT CC P-P SHDN Voltage, Chip Disabled V = 2.7V to 6V l 0.35 V CC SHDN Voltage, Chip Enabled V = 2.7V to 6V l 1.4 V CC SHDN Input Current SHDN = 3.6V l 24 40 m A RF Input Frequency Range 300 to 7000 MHz IN RF Input Power Range RF Frequency = 300MHz to 7GHz (Note 5, 6) V = 2.7V to 6V –32 to 12 dBm IN CC RF AC Input Resistance F = 1000MHz, Pin = –25dBm 150 W IN RF Input Shunt Capacitance F = 1000MHz, Pin = –25dBm 0.6 pF IN 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(cid:176) C to 85(cid:176) C operating temperature BW = 0.35/rise time. range are assured by design, characterization and correlation with Note 5: RF performance is tested at 1800MHz statistical process controls. Note 6: Guaranteed by design. 5508fa 2

LTC5508 TYPICAL PERFORW AU CE CHARACTERISTICS Typical Detector Characteristics, Typical Detector Characteristics, Typical Detector Characteristics, 300MHz 1000MHz 2000MHz 10000 10000 10000 VCC = 3.6V VCC = 3.6V VCC = 3.6V mV) mV) mV) GE ( GE ( GE ( V OUTPUT VOLTAOUT1000 TA = –4T0A° C= 2T5A° =C 85°C V OUTPUT VOLTAOUT1000 TA = –4T0A° C= 25°C TA = 85°C V OUTPUT VOLTAOUT1000 TA = –4T0A° C= 2T5A° =C 85°C 100 100 100 –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 G01 5508 G02 5508 G03 Typical Detector Characteristics, Typical Detector Characteristics, Typical Detector Characteristics, 3000MHz 4000MHz 5000MHz 10000 10000 10000 VCC = 3.6V VCC = 3.6V VCC = 3.6V V) V) V) m m m E ( E ( E ( G G G A A A T T T L L L VO1000 VO1000 VO1000 T T T U U U OUTP TA = –40°C TA = 85°C OUTP TA = –40°C TA = 85°C OUTP TA = –40°C TA = 85°C V OUT TA = 25°C V OUT TA = 25°C V OUT TA = 25°C 100 100 100 –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 G04 5508 G05 5508 G06 Typical Detector Characteristics, Typical Detector Characteristics, 6000MHz 7000MHz 10000 10000 VCC = 3.6V VCC = 3.6V V) V) m m E ( E ( G G A A T T L L O O V1000 V1000 T T OUTPU TA = –40°C TA = 85°C OUTPU TA = –40°C TA = 85°C UT UT VO TA = 25°C VO TA = 25°C 100 100 –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 G07 5508 G08 5508fa 3

LTC5508 TYPICAL PERFORW AU CE CHARACTERISTICS VOUT Slope vs RF Input Power at VOUT Slope vs RF Input Power at VOUT Slope vs RF Input Power at 300MHz 1000MHz 2000MHz 1000 VCC = 3.6V 1000 VCC = 3.6V 1000 VCC = 3.6V mV/dB) 100 mV/dB) 100 mV/dB) 100 OPE ( OPE ( OPE ( V SLOUT 10 TA = –40°C TA = 25°C V SLOUT 10 TA = –40°C TA = 25°C V SLOUT 10 TA = –40°C TA = 25°C TA = 85°C TA = 85°C TA = 85°C 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 VOUT Slope vs RF Input Power at VOUT Slope vs RF Input Power at 3000MHz 4000MHz 5000MHz 1000 1000 1000 VCC = 3.6V VCC = 3.6V VCC = 3.6V dB) 100 dB) 100 dB) 100 V/ V/ V/ m m m PE ( PE ( PE ( O O O SLUT 10 TA = –40°C SLUT 10 TA = –40°C SLUT 10 TA = –40°C O O O V TA = 25°C V TA = 25°C V TA = 25°C TA = 85°C TA = 85°C TA = 85°C 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 G12 5508 G13 5508 G14 V Slope vs RF Input Power at V Slope vs RF Input Power at OUT OUT 6000MHz 7000MHz 1000 1000 VCC = 3.6V VCC = 3.6V V/dB) 100 V/dB) 100 m m PE ( PE ( O O V SLOUT 10 TA = –40°C TA = 25°C V SLOUT 10 TA = –40°C TA = 25°C TA = 85°C TA = 85°C 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 RF INPUT POWER (dBm) RF INPUT POWER (dBm) 5508 G15 5508 G16 5508fa 4

LTC5508 TYPICAL PERFORW AU CE CHARACTERISTICS RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25(cid:176) C) S11 Forward Reflection FREQUENCY RESISTANCE REACTANCE Impedance (GHz) (W ) (W ) 1.000 129.136 –86.960 1.375 100.771 –92.142 1.750 73.844 –81.141 2.125 60.159 –68.796 2.500 50.135 –58.139 2.875 43.042 –48.927 3.250 37.570 –41.033 3.625 33.924 –33.346 4.000 30.923 –26.405 4.375 28.793 –20.012 4.750 26.992 –14.080 5.125 25.717 –8.323 5.500 24.920 –3.228 5.875 24.318 2.177 6.250 24.549 7.535 6.625 25.273 12.197 7.000 26.337 16.503 1.000GHz-7.000GHz 5508 TA03 RF Input Impedance (Pin = –25dBm, V = 3.6V, T = 25(cid:176) C) S11 Forward Reflection IN CC A Impedance FREQUENCY RESISTANCE REACTANCE (GHz) (W ) (W ) 1.000 114.531 –63.267 1.375 95.061 –71.669 1.750 71.491 –64.607 2.125 59.563 –54.798 2.500 51.714 –46.844 2.875 44.940 –39.753 3.250 39.708 –32.738 3.625 36.151 –26.385 4.000 33.227 –20.478 4.375 31.108 –15.107 4.750 29.514 –9.941 5.125 27.899 –4.793 5.500 27.047 0.266 5.875 26.627 5.250 6.250 26.760 10.267 6.625 27.619 14.616 7.000 28.241 18.523 1.000GHz-7.000GHz 5508 TA04 5508fa 5

LTC5508 PIU FUU CTIOU S SHDN (Pin 1): Shutdown Input. A logic low on the SHDN V (Pin 4): Power Supply Voltage, 2.7V to 6V. V should CC CC pin places the part in shutdown mode. A logic high enables be bypassed appropriately with ceramic capacitors. the part. SHDN has an internal 150k pull down resistor to RF (Pin 6): RF Input Voltage. Referenced to V . A IN CC ensure that the part is in shutdown when no input is coupling capacitor must be used to connect to the RF applied. signal source. The frequency range is 300MHz to 7GHz. GND (Pin 2, 5): Ground. This pin has an internal 250W termination, an internal Schottky diode detector and a peak detector capacitor. V (Pin 3): Detector Output. OUT BLOCK DIAGRAW RFSOURCE 12pF TO 200pF (DEPENDING ON APPLICATION) VCC 4 GAIN + COMPRESSION BUFFER 3 VOUT – SHDN 30k 250Ω 6 RFIN 30k 100Ω 20k 100Ω 28pF + RF DET 130mV 20k – BIAS 60µA 60µA 40k 150k GND 2 GND 5 1 5508 BD SHDN 5508fa 6

LTC5508 APPLICATIOUS IUFORWATIOU Operation 60mV. Below 60mV, the voltage gain from the peak detector to the buffer output is 4. Above 120mV, the The LTC5508 RF detector integrates several functions to voltage gain is reduced to 0.85. The compression expands provide RF power detection over frequencies ranging from the low power detector range due to higher gain. 300MHz to 7GHz. These functions include an internally compensated buffer amplifier, an RF Schottky diode peak Modes of Operation detector and level shift amplifier to convert the RF input signal to DC, a delay circuit to avoid voltage transients at MODE SHDN OPERATION VOUT when coming out of shutdown and a gain compres- Shutdown Low Disabled sion circuit to extend the detector dynamic range. Enable High Power Detect Buffer Amplifier Applications The buffer amplifier has a gain of two and is capable of The LTC5508 can be used as a self-standing signal strength driving a 2mA load. The buffer amplifier typically has an measuring receiver for a wide range of input signals from output voltage range of 0.25V to 1.75V. –32dBm to 12dBm for frequencies from 300MHz to 7GHz. RF Detector The LTC5508 can be used as a demodulator for AM and ASK modulated signals with data rates up to 2MHz. The internal RF Schottky diode peak detector and level Depending on specific application needs, the RSSI output shift amplifier converts the RF input signal to a low can be split into two branches, providing AC-coupled data frequency signal. The detector demonstrates excellent (or audio) output and DC-coupled, RSSI output for signal efficiency and linearity over a wide range of input power. The Schottky detector is biased at about 60m A and drives strength measurements and AGC. 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 Gain Compression Methods for RF Power Detectors Replace Directional The gain compression circuit changes the feedback ratio Couplers.” as the RF peak-detected input voltage increases above Demo Board Schematic VCC R3 E4 22k SHDN C1 ENABLE 1 18pF RFIN 2 SHDN RF J1 DISABLE 3 LTC5508 R1 68Ω JP1 R2 GND GND (OPT) 68Ω VCC E2 (OPT) E1 VOUT VOUT VCC VCC E3 C5 C2 C3 E5 GND (OPT) 0.1µF 100pF GND 5508 AI01 5508fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 7 However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LTC5508 PACKAGE DESCRIPTIOU SC6 Package 6-Lead Plastic SC70 (Reference LTC DWG # 05-08-1638) 0.47 0.65 1.80 – 2.20 MAX REF (NOTE 4) 1.16 REF INDEX AREA (NOTE 6) 3.26 MAX2.1 REF 0.96 MIN 1.80 – 2.40 1(.1N5O T–E 1 4.3)5 PIN 1 RECOMMENDED SOLDER PAD LAYOUT 0.15 – 0.30 0.65 BSC PER IPC CALCULATOR 6 PLCS (NOTE 3) 0.10 – 0.40 0.80 – 1.00 NOTE: 0.00 – 0.10 1. DIMENSIONS ARE IN MILLIMETERS REF 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, 0.10 – 0.30 BUT MUST BE LOCATED WITHIN THE INDEX AREA 0.10 – 0.18 SC6 SC70 0802 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70 (NOTE 3) RELATED PARTS PART NUMBER DESCRIPTION COMMENTS RF Power Controllers LTC1757A RF Power Controller Single/Dual Band GSM/DCS/GPRS Mobile Phones LTC1758 RF Power Controller Single/Dual Band GSM/DCS/GPRS Mobile Phones LTC1957 RF Power Controller Single/Dual Band GSM/DCS/GPRS Mobile Phones LTC4400 SOT-23 RF PA Controller Single/Dual Band GSM/DCS/GPRS Phones, 45dB Dynamic Range, 450kHz Loop BW LTC4401 SOT-23 RF PA Controller Single/Dual Band GSM/DCS/GPRS Phones, 45dB Dynamic Range, 250kHz Loop BW LT5500 1.8GHz to 2.7GHz RF Front End Dual LNA gain Setting +13.5dB/–14dB at 2.5GHz, Double-Balanced Mixer, 1.8V £ V £ 5.25V SUPPLY LT5502 400MHz Quadrature Demodulator with RSSI 1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain, 90dB RSSI Range LT5503 1.2GHz to 2.7GHz Direct IQ Modulator and 1.8V to 5.25V Supply, Four-Step RF Power Control, 120MHz Modulation Bandwidth Up Converting Mixer LT5504 800MHz to 2.7GHz RF Measuring Receiver 80dB Dynamic Range, Temperature Compensated, 2.7V to 5.5V Supply LTC5505 300MHz to 3.5GHz RF Power Detector >40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply LT5506 500MHz Quadrature IF Demodulator with VGA 1.8V to 5.25V Supply, 40MHz to 500MHz IF, –4dB to 57dB Linear Power Gain LTC5507 100kHz to 1GHz RF Power Detector 48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply LT5511 High Signal Level Up Converting Mixer RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer LT5512 High Signal Level Down Converting Mixer DC-3GHz, 20dBm IIP3, Integrated LO Buffer 5508fa 8 Linear Technology Corporation LT/TP REV A 0603 1K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com ª LINEAR TECHNOLOGY CORPORATION 2002

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LTC5508ESC6-DUP LTC5508ESC6#TRM LTC5508ESC6#TRMPBF LTC5508ESC6#TRPBF LTC5508ESC6 LTC5508ESC6#TR LTC5508ESC6#PBF