DEMO MANUAL DC1646A LTC5564 15GHz RF Power Detector with Comparator Description The demonstration circuit 1646A features the LTC®5564, an UltraFast™ RF peak detector with a built in gain-selectable high speed operational amplifier and comparator. plans. The Demo Circuit Modification page provides the design information required for modifying with this demo circuit 1646A. The 1646A demo circuit includes a simple impedance matching network that provides better than 10dB return loss for working frequencies ranging from 5.2GHz to 6.2GHz and from 14.7GHz to 16.5GHz. The input matching circuit can be easily changed for other working frequency Design files for this circuit board are available at http://www.linear.com/demo PERFORMANCE SUMMARY PARAMETER Supply Voltage Supply Current Amplifier Characteristics VOUT Output Offset Demodulation Bandwidth VOUT Output Voltage Swing Comparator Characteristics VCOMP Low VCOMP High Comparator Response Time Comparator Hysteresis L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C), VCC = VCCRF = VCCA = VCCP = 5V CONDITIONS Supply Voltage = 5V, No RFIN Gain1 Gain2 Gain4 Gain8 Supply Voltage = 3.3V, No RFIN Gain1 Gain2 Gain4 Gain8 Gain1, VOUT = 500mV Gain2, VOUT = 500mV Gain4, VOUT = 500mV Gain8, VOUT = 500mV Supply Voltage = 3V to 5V TYP 44 UNITS V mA 290 295 315 360 mV mV mV mV 280 280 290 315 75 52 35 15 mV mV mV mV MHz MHz MHz MHz V 0.3 Supply Voltage = 5V Supply Voltage = 5V 10dBm RFIN Step to VCOMP 50% RF Characteristics RFIN Frequency Range RFIN AC Input Resistance RFIN Input Shunt Capacitance RFIN Input Power Range MIN 3 MAX 5.5 VCCA – 1.6 0.2 4.8 9 10 0.6 Frequency = 1000MHz, Power Level = 0dBm Frequency = 1000MHz, Power Level = 0dBm V V ns mV 15 GHz 16 Ω pF dBm 135 0.77 –24 Digital I/O LOW = 0.8V (Max), HIGH = VCCA – 0.8V (Min) LEN Comparator Enable Comparator Disable VCCA –0.8 0.8 V V dc1646af 1 DEMO MANUAL DC1646A quick start procedure Operation The demonstration circuit 1646A is preconfigured to work for applications at frequencies of 5.8GHz and 15GHz. It has better than 15dB return loss at these targeted frequencies. The input dynamic range at 5.8GHz is 40dB (from –24dBm to 16dBm) and slightly lower sensitivity at 15GHz. Comparator The high speed comparator compares the external reference voltage on the VREF pin to the internal signal voltage VP from the peak detector and produces the output logic signal VCOMP. VP is the internal comparator positive input as shown in Figure 1 Simplified Block Diagram. The demo board has a typical 10mV hysteresis for its comparator and its response time can be as fast as 9ns (10dBm input power step to VCOMP 50%) through out its supporting frequencies. The, 1646A demo board’s, LEN test point provides latch enable/disable functionality of the comparator. The comparator is always enabling with the pulling down 10k resistor (R8) to ground. Connecting The LEN test point to VCC will place the comparator in the disable mode. The R1 and R2 footprints are optional for configuring DC voltage of the VREF test point. The C1 is the ground coupling capacitor of the, R1 and R2, voltage divider. VCCRF RFIN VCCA VCCP 250Ω 8pF 80µA 1.2k VP VBIAS LEN + – VCOMP + – VREF VOUTADJ 1.7k 1.6k 200Ω 200Ω + – PROGRAMMABLE FEEDBACK ARRAY VOUT DC1664 F01 PINS 3, 4, EXPOSED PAD PIN 17 G1 Figure 1. Simplified Block Diagram G0 The VCC_COMP (E11) test point is an alternative output of VCOMP (J2 SMA connector). Install a 0Ω resistor or a jumper to R3 will have the comparator Output at VCC-COMP test point. Loading Bypass Capacitors The LTC5564 has been designed to directly drive a capacitive load of 10pF at VOUT. When driving a capacitive load greater than 10pF a series resistance should be added between VOUT and the load to maintain good stability. This resistance should be placed as close to VOUT as possible. The demo board 1646A is loaded with R series = R6 = 0Ω. Refer to Table 2 for typical series resistor (R6) values for various capacitive loads. Table 2. Typical Series Resistor (R6) Values for VOUT Capacitive Loading CLOAD R SERIES(R6) Up to 10pF 0Ω 11pF to 20pF 40Ω 21pF to 100pF 68Ω Greater Than 100pF 100Ω Amplifier The high speed amplifier offers four gain settings and is capable of driving a 1.7mA load with an output swing range of approximately 295mV to VCC – 1.6V. The standard demonstration circuit 1646A has a unity gain. Therefore, the pins G0 and G1 (or the test point Gain0 and Gain1) are pulling down for the logical Low with R10 = R11 = 10k resistors. The pins can be connected to VCC forming the logical High for others gains setting. Refer to Table 3 for gain setting operation. The VOUTADJ pin provides output DC offset adjustment to satisfy various interface requirements. Setting VOUT to 500mV also provides the maximum demodulation bandwidth in each gain mode. The R9, R12 and C13 footprints are provided on the demo board to configure the VOUTADJ DC voltage. The R9 and R12 are forming voltage divider topology and the C13 is the ground coupling capacitor. Refer to the LTC5564 dc1646af 2 DEMO MANUAL DC1646A quick start procedure data sheet for Typical Performance Characteristics curve or Table 3 for the typical VOUTADJ voltage for the desired VOUT DC output offset in each gain setting. The VCC_OUT (E12) test point is an alternative output of VOUT (J3 SMA CONNECTOR). Install a 0Ω resistor or a jumper at R5 will have the VOUT at this VCC_OUT test point. The R7 and C12 footprints are provided for output loading at designed resistance and capacitance. Demonstration circuit 1646A is easy to setup for evaluating the performance of the LTC5564. Refer to Figure 2 for measurement equipment set-up and follow the procedure below: A. Measure Detector Output Power (VOUT): Connect DC power supply’s negative (–) lead to demo board GND test point and positive (+) lead (between 3V to 5.5V) to VCC test point. Connect a DC volt meter to the VOUT port (SMA connector J3) to measure the DC detector output voltage. Connect signal generator’s output to demo board RFIN (SMA connector J1) via coaxial cable. It is common practice to include a 2dB or 3dB attenuation pad to minimize reflections back into the signal generator. (Typical 540mV VOUT with 0dBm input power at 5.8GHz) B. Measure Comparator Output (VCOMP): Connect DC power supply’s negative (–) lead to demo board GND test point and positive (+) lead (between 3V to 5.5V) to VCC test point. Connect a DC volt meter (or an oscilloscope) to the VCOMP port (SMA connector J2) to measure the VCOMP switch point voltages. Set VREF to desired reference voltage. (with 10dBm input power at RFIN, the typical VREF tripped point is 1.23V) Increase The RF input power level to the point when the VCOMP output voltage will go to a high level. (typically VCC – 0.2V) Optional measurements can be done by increasing VREF reference level. During the measurements, when VCOMP is HIGH, connect LEN to VCC. Remove the RF input signal and the VCOMP will continue to stay high. Table 3. Gain Mode and Typical VOUTADJ Operation PIN DESCRIPTION REQUIRED VOUTADJ FOR A GIVEN DC OUTPUT OFFSET GAIN1 Minimum Gain Setting (VOUT/RFIN ≈ 1.5dB) VOUTADJ = 0.95 • VOUT – 0.174 VCCA GAIN2 VOUT/RFIN Increased 6dB VOUTADJ = (VOUT – 0.07)/2.10 VCCA GND GAIN4 VOUT/RFIN Increased 12dB VOUTADJ = (VOUT + 0.05)/3.16 VCCA VCCA GAIN8 VOUT/RFIN Increased 18dB VOUTADJ = (VOUT + 0.25)/5.26 G1 G0 GAIN MODE GND GND GND Note: Valid range for VOUT ≈ 0.195V ≤ VOUT ≤ VCC – 1.6 dc1646af 3 DEMO MANUAL DC1646A quick start procedure DC POWER SUPPLY CH2 CH1 GND V+ (3V TO 5.5V) V+ 2dB OR 3dB ATTENUATOR PAD SYNTHESIZED SIGNAL GENERATOR HP83731A DC VOLT METER FREQUENCY = 1GHz TO 15GHz AMPLITUDE = –24dBm TO 16dBm PIN LEN VREF VP GO G1 GAIN MODE GND GND GAIN1 VCC GND GAIN2 GND VCC GAIN4 VCC VCC GAIN8 DC1646 F02 VCOMP VOUT TRANSPARENT VOUT LATCHED VOUT TRANSPARENT LTC5564 COMPARATOR LATCH ENABLE FUNCTION Figure 2. Proper Measurement Equipment Set-Up dc1646af 4 DEMO MANUAL DC1646A quick start procedure Modification of RFIN Port for Other Frequency Ranges VCC C2 1000pF C3 100pF Z2 (OPT) J1 RFIN C7 (OPT) Z1 0.5pF VCOMP C4 10pF 17 16 NC C5 J2 R4 (OPT) 15 VCCRF 14 VREF 13 VCC VCOMP 1 RFIN VCCA 12 2 NC VCCP 11 3 GND VOUT 10 C9 10pF 2.2pF 4 GND NC LEN VOUTADJ GAIN0 5 6 7 9 C10 100pF E12 VCC_OUT C11 1000pF R5 (OPT) R6 VOUT 0 Ohm U1 LTC5564IUD C12 (OPT) J3 R7 (OPT) GAIN1 8 Impedance Matching Circuits Components and Values at Selected Frequency Ranges FREQUENCY RANGE(1) C5 VALUE/PART# (2) Z1 VALUE/PART# (2) Z2 VALUE/PART# (2) 1.6GHz to 3.4GHz 100pF/GJM1555C1H101JZ01 6.8nH/0402CS-6N8XGL No Placement 7GHz to 8.5GHz 0.5pF/GJM1555C1HR50BB01 0.3pF/GJM1555C1HR30BB01 No Placement 8.6GHz to 10.7GHz 0.2pF/GJM1555C1HR20BB01 0.1pF/GJM1555C1HR10BB01 No Placement 11.7GHz to 12.2GHz 10pF/GJM1555C1H100JB01 No Placement 2.2pF/GJM1555C1H2R2CB01 0.5GHz to 1.9GHz and 5.7GHz to 11.3GHz(3) 20pF/GJM1555C1H200JB01 137Ω/RK73H1ETTP1370F 137Ω/RK73H1ETTP1370F 5.2GHz to 6.2GHz and 14.7GHz to 16.5GHz(4) 2.2pF/GJM1555C1H2R2CB01 0.5pF/GJM1555C1HR50BB01 No Placement (1) The impedance matching networks at stated frequency ranges have 10dB or better return loss. (2) Capacitors, inductors and resistors are manufacture by MURATA, COILCRAFT or KOA respectively. (3) Resistive matching has wider frequency ranges at the expense of degraded sensitivity by 6dB to 8dB. (4) Default DC1646A demo board frequencies ranges. dc1646af 5 DEMO MANUAL DC1646A parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 3 C1, C3, C10 CAP, NPO 100pF 25V 10% 0402 AVX 04023A101KAT2A 2 2 C2, C11 CAP, X7R 1000pF 50V 10% 0402 AVX 04025C102KAT2A 3 2 C4, C9 CAP, NPO 10pF 25V 10% 0402 AVX 04023A100KAT2A 4 1 C5 CAP, C0G 2.2pF 50V ±0.25pF 0402 MURATA GJM1555C1H2R2CB01D 5 0 C7, C13 (OPT) CAP, 0402 6 0 C12 (OPT) CAP, 0603 7 1 C14 CAP, TANT 2.2µF 20V 20% 3216 AVX TPSA225M020R3000 8 9 E1, E2, E5, E7, E8, E9, E10, E11, E12 TURRET, TESTPOINT 0.063” MILL MAX 2308-2-00-80-00-00-07-0 E. F. JOHNSON 142-0701-851 9 3 J1, J2, J3 CONN, SMA 50Ω 10 0 R1 to R5, R7, R9, R12 (OPT) RES, 0603 11 1 R6 RES/JUMPER, CHIP 0Ω 1/16W 1A 0603 VISHAY CRCW06030000Z0EA 12 3 R8, R10, R11 RES, CHIP 10K 0.06W 5% 0603 VISHAY CRCW060310K0JNEA 13 1 U1 I.C., PRECISION RF PWR DET QFN(16)(UD)3mm × 3mm LINEAR TECHNOLOGY CORP LTC5564IUD 14 1 Z1 CAP, C0G 0.50pF 50V ±0.1pF 0402 MURATA GJM1555C1HR50BB01D Z2 (OPT) RES, 0402 15 0 16 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1646A 17 1 STENCIL STENCIL 1646A dc1646af 6 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. 1 2 3 4 E8 E2 E1 J1 + VCC C14 2.2uF C7 (OPT) Z1 0.5pF Z2 (OPT) 2.2pF C5 B A B 0402CS-6N8XGL GJM1555C1HR50BB01 GJM1555C1HR30BB01 GJM1555C1HR10BB01 NO PLACEMENT GJM1555C1HR50BB01 6.8nH 0.5pF 0.3pF 0.1pF 0.5pF GJM1555C1H101JZ01 GJM1555C1H2R2CB01 GJM1555C1HR50BB01 GJM1555C1HR20BB01 GJM1555C1H100JB01 GJM1555C1H2R2CB01 100pF 2.2pF 0.5pF 0.2pF 10pF 2.2pF Z1 MANUFACTURE # VALUE C5 MANUFACTURE # VALUE NOTE: CAPACITORS ARE MANUFACTURED BY MURATA; INDUCTORS ARE MANUFACTURED BY COILCRAFT. 1.7GHz to 3.1GHz 5.1 to 6.1 GHz 7.0 to 8.5 GHz 8.3 to 10.2 GHz 11.9 to 12.2 GHz 14.9 to 16.5 GHz FREQUENCY RANGE 2.2pF VALUE R8 10K C2 1000pF LTC5564 MATCHING CIRCUITS COMPONENTS AND VALUES. LEN GND VCC RFIN A Z2 R12 (OPT) R9 (OPT) VCC 5 LEN GND 14 VREF 6 NO PLACEMENT NO PLACEMENT NO PLACEMENT NO PLACEMENT GJM1555C1H2R2CB01 NO PLACEMENT C13 (OPT) 7 13 R11 10K 9 C10 100pF C THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. John C. APP ENG. D SCALE = NONE RB DATE: N/A SIZE GAIN0 GAIN1 GND VOUT Monday, January 10, 2011 E SHEET 1 4 OF 1 REV. LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 E 15GHz RF DETECTOR TECHNOLOGY E9 E7 E5 J3 LTC5564IUD DEMO CIRCUIT 1646A IC NO. VCOMP E12 VCC_OUT J2 E11 VCC_COMP E10 VREF TITLE: SCHEMATIC R7 (OPT) R5 (OPT) APPROVALS C12 (OPT) 0 Ohm R6 D PCB DES. C11 1000pF VCC U1 LTC5564IUD C9 10pF CUSTOMER NOTICE 10 11 R4 (OPT) LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 8 GAIN1 NC VOUT VCCP VCCA 12 R3 (OPT) R2 (OPT) VCOMP R10 10K VOUTADJ GAIN0 MANUFACTURE # 4 3 GND 2 NC 15 VCCRF C4 10pF 16 NC 1 RFIN 17 C3 100pF VCC C1 100pF R1 (OPT) VCC C 1 2 3 4 DEMO MANUAL DC1646A Schematic Diagram dc1646af 7 DEMO MANUAL DC1646A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1646af 8 Linear Technology Corporation LT 0311 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2011