5 4 3 2 1 REVISION HISTORY SHDN EN VCC TP6 ECO TP7 REV DESCRIPTION DATE 2 PRODUCTION 03/02/10 APPROVED VCC R61 1K WALTER S. R62 [1] D D R63 [1] R64 1K NOTES: UNLESS OTHERWISE SPECIFIED, [1] DO NOT STUFF. VCC R65 1K C73 0.1uF [1] 10nF 6 VCC C82 C81 0.1uF 1000pF VCC 19 20 VCC GND 21 SHDN EN 23 22 VCM GND VCM DECL2 VCC VCC 17 AIN+ SHT 2 16 C AIN- SHT 2 15 14 13 C80 VCC C83 1000pF 0.1uF 25 C79 0.1uF 18 GND 5 C86 -OUT 12 4 10nF R69 0 -IN -VG 0dB -IN +OUT VREF 1:1 +IN 11 3 +VG C78 GND 10 3 GND 2 4 GND 9 10nF 8 1 2 GND 24 1 7 T1 VCC U9 LTC6412CUF C75 5 J3 C74 C72 1000pF J1 +IN C VCC C71 1000pF DECL1 R67 [1] R66 1K CA1 1uF R70 [1] C84 B B 0.1uF TP10 R71 0 GND C77 0.1uF TP8 R72 100 C87 [1] C88 1uF R75 100 TP9 +VG -VG CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. MI VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. WALTER S. TITLE: SCHEMATIC APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only A DIRECT-TO-DIGITAL IF RECEIVER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 N/A SCALE = NONE IC NO. LTC6412CUF / LTC2261CUJ DEMO CIRCUIT 1600A DATE: Tuesday, March 02, 2010 2 SHEET 1 1 REV. 2 OF 2 5 4 3 2 1 VDD R14 1K TP1 EXT REF C17 VCC C89 [1] VCC R45 D C7 4.7pF 100 U3 FIN1108 3 22 27 46 13 C13 L1 [1] C51 1uF C62 68pF ENABLE R40 49.9 1% 1000pF C63 VCC 22pF R44 0 R16 100 C23 R10 0 C21 1uF 7 C29 C30 C31 C32 C34 C35 C36 8 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 9 PAR/SER VDD R47 0 R48 0 GND R56 OPT 31 33 D10_11- D10_11+ 32 D12_13- 34 OF- D12_13+ 35 36 OF+ VREF VCM 38 39 D6_7- VDD D4_5+ VDD D4_5- 28 24 26 25 24 23 22 21 U2 LTC2261CUJ R22 100 OPT 1 VOUT 0.01uF R52 U5 PCF8574TS/3 0 W 1 OPT R4 OPT R55 OPT VDD VDD VDD SCL SDA 1 2 ENCC60 R53 OPT R57 0 R54 0 R33 1K 0.01uF JP2 PAR U4 LT1763CDE-1.8 TP3 2 PAR/SER EN R35 1K 6 7 9 JP4 1 2 1 CS EN 2 SDI L2 10 11 V+ C24 4.7uF C14 12 1 4 9 1uF GND IN IN NC NC NC NC OUT OUT SENSE GND SHDN GND 3 SER C54 5 C38 3 DIS PAR/SER BEAD 6 C22 12 1 4 9 1uF NC NC NC NC OUT OUT SENSE SHDN GND A0 A1 A2 3 10 11 12 14 16 17 19 20 18 13 8 7 6 5 SCK SDI SD0 CS SCK/SCL MOSI/SDA MISO VOUT R6 EEVCC EESDA EESCL EEGND 10K CS OX40 NC DUTY CYCLE STAB. SDA VCC_IN R29 4.99K 1% VOUT 6 4 7 5 B RN1 1 2 3 4 33 8 7 6 5 10 9 11 12 CS SCK SDI SD0 C52 C53 100pF 100pF FAST DAACS BOARD ID CIRCUITRY VSS C27 0.1uF VCC_IN 1% 1 2 3 4 14 VCC_IN SDA SCL VSS U1 24LC025-I/ST 8 A0 VCC 7 A1 WP 6 A2 SCL 5 A3 SDA R25 4.99K SCL SCL SDA R26 4.99K 1% SDA SHDN BEAD VCC L9 R8 6.81K 1% VIN U8 LT1763CDE 2 3 10 11 5 C68 6 0.01uF C55 CUSTOMER NOTICE BEAD 1uF 22uF 12 1 4 9 IN IN NC NC NC NC OUT OUT SENSE BYP 7 8 SHDN GND 2 3 R58 10K 1% 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. R59 5.49k 1% 5 6 C69 C70 0.01uF 22uF 4 APPROVALS PCB DES. APP ENG. TECHNOLOGY MI DIRECT-TO-DIGITAL IF RECEIVER SIZE 3 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only WALTER S. TITLE: SCHEMATIC 7 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 VSS SCL VOUT C39 BYP 8 C 7 R7 10K 1% IN IN OXA2 C37 0.1uF U6 LT1763CDE 10 11 SCL SDA NC NC P0 P1 P2 P3 P4 P5 P6 P7 NC NC 33 OXA0 22uF L3 A DIS INT RN2 1 2 3 4 BEAD L4 0.01uF BYP 8 TP5 2 3 VCC_IN VSS SCL SDA 1 2 3 8 13 TP2 JP3 1 VDD OVDD VIN 4V - 6V R34 1K 2 4 3 8 VUNREG 5V 15 J9 U7 24LC32A-I/ST 8 A0 VCC 7 A1 WP 6 A2 SCL 5 A3 SDA J8 2 0.01uF 5 C59 C58 C3 1 2 3 4 R24 100K VDD 1 R1 301 1% 0 W C56 0.1uF ENABLE GND 2 D1 HSMS-2822 OPT 2 3 1 C1 B 1 R51 OPT 2 2 OPT R23 100 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 SD0 ENC+ 2 SDI C2 0.01uF 1 R2 301 1% SCK T3 WBC4-1WL CS R50 36nH OUT1OUT1+ OUT2+ OUT2OUT3OUT3+ OUR4+ OUT4OUT5OUT5+ OUT6+ OUT6OUT7OUT7+ OUT8+ OUT8- R49 R5 OPT 1 L6 VBB OVDD C57 J7 IN1IN1+ IN2+ IN2IN3IN3+ IN4+ IN4IN5IN5+ IN6+ IN6IN7IN7+ IN8+ IN8- +D12/D13 -D12/D13 +D10/D11 -D10/D11 +D8/D9 -D8/D9 +CLK -CLK +D6/D7 -D6/D7 +D4/D5 -D4/D5 +D2/D3 -D2/D3 +D0/D1 -D0/D0 27 1 TP4 C61 0.01uF PAR/SER 41 BEAD D6_7+ GND R46 OPT 2 L5 10 VDD OGND REFL R30 100 EN12 EN34 EN56 EN78 EN 45 44 43 42 41 40 39 38 35 34 33 32 31 30 29 28 EDGE-CON-100 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 GND GND GND C28 REFL R21 100 29 P1 1 2 23 36 37 6 OVDD D2_3+ C20 CLKOUT- REFH D2_3- VOUT REFH R20 100 30 20 5 0.1uF CLKOUT+ D0_1+ C GND 19 4 18 C15 D0_1- 3 0.1uF D8_9- 17 1000pF D8_9+ AIN- SDO 0.1uF 2 C67 SDI 1000pF C66 16 0.1uF C65 SCK 0.1uF C64 15 0.1uF C33 14 0.1uF C19 ENC+ C18 AIN+ 12 1 VDD VCC 11 VDD 37 VDD 40 C90 [1] 4 5 6 7 8 9 10 11 14 15 16 17 18 19 20 21 R19 100 1uF SENSE VCC C12 4.7pF CS L8 47nH ENC- AIN- C26 R18 100 13 SHT 1 12 25 26 47 48 R39 49.9 1% C6 0.1uF 1 2 VC1 VC2 VC3 VC4 VC5 C9 68pF AIN+ VOUT R17 VE1 VE2 VE3 VE4 VE5 SHT 1 C10 22pF 2 L7 47nH R9 0 1 D 1uF 0 N/A SCALE = NONE IC NO. LTC6412CUF / LTC2261CUJ DEMO CIRCUIT 1600A DATE: Tuesday, March 02, 2010 SHEET 2 1 REV. 2 OF 2 A