5 4 3 2 1 ECO REV __ CLK 33 OHM U2 NC7SVU04P5X +9V/+10V R45OPT C68 15pF COG R44 0 OHM 0 - VREF R55 0 OHM C70 OPT 2 J2 BNC AC C64OPT 6 5 R47 OPT R58 OPT 7 U18B LT6203MS8 R39 0 OHM R40 OPT R36 OPT R52 0 OHM 5 + 6 - 5 0402 0 OHM R4 C551.0uF 25V R500 OHM V- C581.0uF 25V Q 3 5 4 2 CNVST_33 33 OHM U4 NC7SVU04P5X C570.1uF 25V C44 1.0uF 25V C13 +3.3V 0.1uF JP6 FS VREF 2 U6 NC7SZ66P5X 0.8VREF 3 SCK SDO BUSY RDL/SDI 9 2 13 14 5 +3.3V VCC CNV CNV C R85 33 11 B SCK SDO 12 C15 0.1uF A 1 OE 4 4 2 J3-2 R13 1K C16 0.1uF GND BUSY U9 NC7SZ04P5X R17 2K 3 TP5 RDL R7 1K DC590_DETECT B NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. MSPS BIT LTC2378CMS-20 U1 1 20 -B LTC2377CMS-20 0.5 20 -C LTC2376CMS-20 0.25 20 V+ GND C420.1uF 25V C48 0.1uF 25V C19 0.1uF 25V C17 1.0uF 25V GND C40 1.0uF 25V C47 0.1uF 25V TP7 TP6 TP4 CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 Q R15 7 BYPASS CAPS FOR U10 V+ A C49 1.0uF 25V IN- * C56 0.1uF C12 0.1uF R51 10 OHMS GND 5 PR 8 C4 0.1uF R8 33 OHM 7 8 U1 LTC237XCMS-20 R9 0 OHM 0402 IN+ 4 * ASSY -A BYPASS CAPS FOR U18 C43 0.1uF 25V C73 6800pF 1206 NPO C10 0.1uF 7 C66 OPT V- C71 6800pF 1206 NPO U10B LT6203MS8 C75 OPT C62 10uF 6.3V C72 3300pF 1206 NPO C39 OPT R56 OPT C9 10uF 6.3V REF REF/DGCL R48 10 OHMS 15 - C65OPT DC C69 10uF 6.3V 2 C20 47uF 10V 1210 X7R CHAIN C63 R38 249 1 VCC CLR VREF +2.5V 1 R46 0 OHM OPT C59 10uF 6.3V D C7 0.1uF OVDD 4 3 R34 499 E5 B 3 + R49 OPT R33 499 C74 1.0uF 25V JP8 COUPLING C76 OPT 3 V- C61 OPT EXT EXT_CM R57 OPT VR41 0 OHM 2 CP C3 0.1uF 1 R18 249 VREF/2 1 1 C8 1.0uF C6 10uF 6.3V 2 - U18A LT6203MS8 E3 VDD + 2 JP4 CM V- C77 V- 0.1uF 25V AIN- 5 GND GND GND GND 3 R88 1 OHM 1 6 C46 2.2uF 10V +3.3V U10A LT6203MS8 V+ V+ 8 - U5 LT6202CS5 2 R87 499 6 GND VREF C60 10uF 6.3V 5 4 C78 4.7uF 6.3V GND GND LTC6655-5.0 +3.3V 7 3 6 16 10 R54 OPT V+ V+ OUTS 0 OHM OPT 3 + GND 4 2 +3.3V R37 0 OHM VREF R86 499 OUTF 8 10uF 6.3V C67 OPT C45 0.1uF 25V GND R30 R35 C 4 VIN 4 0 - VREF 2 R53 DC C18 + AC 0 OHM 3 SHDN 8 1 - J4 BNC AIN+ 0.1uF 1 U15 1 2 JP7 COUPLING D +3.3V 5 4 C11 3 07-16-12 3 NC7SZ04P5X U3 NL17SZ74 R3 2 DATE G.HOOVER 5 5 4 APPROVED 3 R6 1K R5 49.9 1206 U8 DESCRIPTION PRODUCTION 2 R1 33 OHM C2 0.1uF 3 5 2 3 CLK IN 100MHz MAX 3.3VPP +3.3V C1 0.1uF R2 1K C5 0.1uF J1 BNC D +3.3V 1 +3.3V REVISION HISTORY 3 2 APPROVALS PCB DES. M.HAWKINS APP ENG. G. HOOVER TECHNOLOGY TITLE: SCHEMATIC SIZE N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: LOW NOISE, HIGH SPEED 20-BIT SAR ADC IC NO. REV. LTC237XCMS-20 FAMILY DEMO CIRCUIT 1925A 07-16-2012 1 2 SHEET 1 OF 2 A 4 IO17 IO18 IO19 IO20 IO21 IO33 DB18 IO34 DB19 8 IO35 15 IO36 CNVST_33 16 IO37 17 IO38 18 IO39 19 IO40 20 IO41 21 IO42 IO47 IO48 EPM240GT100C5N IO49 IO50 IO54 30 33 SDO R14 33 SCK RDL BUSY 37 IO61 SCK IO66 38 40 41 42 47 69 IO69 48 49 50 R60 10K 0402 C DB0 R72 33 73 IO73 R73 33 DB1 IO92 IO95 DB2 75 IO75 R61 33 IO96 R67 33 DB19 DB9 92 95 R75 33 96 R76 33 DB10 CLKOUT DB12 100 IO100 DB13 DB13 R77 33 DB14 DB11 R78 33 DB9 DB15 DB7 R59 1K 0402 64 10 9 (NC) 43 8 7 (NC) 44 6 5 22 4 3 23 2 1 24 25 GCLK1 C31 0.1uF 0402 C32 0.1uF 0402 C33 0.1uF 0402 A C34 0.1uF 0402 C35 0.1uF 0402 C36 0.1uF 0402 C37 0.1uF 0402 C38 0.1uF 0402 DB2 DB0 DEV_CLRN +9V/+10V 5 SHDN R81 4.99K 8 TP1 5 +9V/+10V GND GND GND GND GND GND GND GND 10 11 32 46 60 93 65 79 4 TP2 5 6 TP3 7 8 9 10 11 12 13 14 SCK U7 4 BYP CNV CNV 24LC024-I /ST JP3 VCCI0 C26 10uF 6.3V +2.5V +3.3V R27 2.8K +2.5V OUT SEN SHDN BYP 1 2 R19 1K C30 0.01uF 25V SCL SDA WP A2 A1 A0 3 2 1 WP 2 JP1 EEPROM -9V / -10V E8 2 PROG C54 1.0uF 25V J3 4 OUT IN SEN SHDN BYP E4 1 2 4 R42 5.62K JP2 V+ C50 0.01uF 25V R23 6.49K V+ C52 10uF 25V 0805 8V 2 R43 1K B 5V 3 1 IN OUT SHDN GND ADJ 5 R28 2K JP5 V- 4 -3.6V V2 GND R29 1K CUSTOMER NOTICE 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. 3 +2.5V U17 LT1964ES5-SD -9V/-10V THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 E2 V+ U16 LT1763CS8 6 5 7 DC590 PCB MTG. HOLES C C29 10uF 6.3V EPM240GT100C5N MH3 MH4 +3.3V 2 R26 1.54K IN R12 4.99K 3 VCCINT VCCINT VCCIO1 VCCIO1 VCCIO1 VCCIO2 VCCIO2 VCCIO2 3 R11 4.99K D 4 R25 1.69K C27 0.01uF 25V C28 1.0uF 25V 5 R10 4.99K +1.8V C24 10uF 6.3V E1 U14 LT1763CS8-2.5 J3-2 2 BYP 2 SEN C51 1.0uF 25V 1 SHDN C23 0.01uF 25V 1 OUT +9V/+10V TDO C14 0.1uF SEN 2 +3.3V TCK SCK IN E10 1 +3.3V IN 8 MH1 MH2 5 5 C25 1.0uF 25V TDI +9V/+10V OUT C22 1.0uF 25V U13 LT1763CS8 8 TMS U11F 13 63 9 31 45 59 80 94 DB4 C21 22uF 25V 1210 E7 GND EDGE-CON-100 R80 2K 0603 SDO +3.3V DB6 DEV_OE EPM240GT100C5N +1.8V DB8 GCLK3 R24 1K B DB1 GCLK2 DB10 8 +1.8V 8 62 DB3 DB12 VCC J5 JTAG 14 1K 0402 GCLK0 DB14 VSS R22 R21 10K U11E DB5 4 +3.3V R20 1K 0402 12 CLK CLK2 DB15 99 IO99 DB16 E6 +9V/+10V DB11 EPM240GT100C5N +3.3V 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 DB18 DB17 R68 33 R74 33 98 IO98 EPM240GT100C5N 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 DB8 97 IO97 DB3 R66 33 91 IO91 74 IO74 90 IO90 72 IO72 R16 300 0402 EPM240GT100C5N 71 IO71 +3.3V R71 33 DB7 89 IO89 70 IO70 88 IO88 68 R65 33 87 IO87 67 IO68 86 IO86 66 DB6 85 IO85 61 IO67 39 84 IO84 58 IO58 36 R64 33 83 IO83 57 IO57 82 IO82 56 IO56 81 IO81 55 IO55 34 35 54 DB5 U12 LT1763CS8-1.8 +9V/+10V 1 IO16 7 R83 33 DB17 29 IO78 R63 33 3 IO15 R82 33 IO30 IO53 78 1 IO8 6 IO29 DB16 53 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 77 IO77 3 IO7 R70 33 28 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 1 IO6 R69 33 5 52 IO52 DB4 3 IO5 4 IO28 CLKOUT 27 P1 R62 33 GND GND GND D R79 33 CLK2 IO27 76 IO76 3 6 7 IO4 3 CLKOUT TP8 51 IO51 GND GND GND IO3 R84 33 DC590_DETECT GND GND GND IO2 2 26 3 6 7 IO1 IO26 U11D 1 1 1 3 6 7 U11C U11A 2 GND GND GND U11B 3 3 6 7 5 2 APPROVALS PCB DES. M.HAWKINS APP ENG. G. HOOVER TECHNOLOGY E9 V- C53 10uF 25V 0805 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC LOW NOISE, HIGH SPEED 20-BIT SAR ADC IC NO. REV. SIZE LTC237XCMS-20 FAMILY N/A SCALE = NONE DATE: DEMO CIRCUIT 1925A 07-16-2012 1 2 SHEET 2 OF 2 A