DEMO MANUAL DC1805A LTC6362 Driving 18-Bit SAR ADC Description The LTC(R)6362 is a low power, low noise differential op amp with rail-to-rail input and output swing that has been optimized to drive low power SAR ADCs. The amplifier may be configured to buffer a fully differential input signal or convert a single-ended input signal to a differential output signal. The LTC2380/LTC2379/LTC2378/LTC2377/LTC2376 are low power, low noise ADCs with serial outputs that can operate from a single 2.5V supply. The DC1805A demonstrates the DC and AC performance of the LTC6362 driving the LTC2379-18 when used in conjunction with the DC590B QuikEvalTM and DC718 fast DACs data collection boards. Use the DC590B to demonstrate DC performance such as peak-to-peak noise and DC linearity. Use the DC718 if precise sampling rates are required or to demonstrate AC performance such as SNR, THD, SINAD and SFDR. The DC1805A is intended to demonstrate recommended grounding, component placement and selection, routing and bypassing for LTC6362 and the ADC. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval and PScope are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Figure 1. DC1805A Connection Diagram dc1805af 1 DEMO MANUAL DC1805A Description Table 1. DC1805A Assembly Options ASSEMBLY VERSION PART NUMBER MAX CONVERSION RATE NUMBER OF BITS MAX CLK IN FREQUENCY DC1805A-A LTC2380CMS-16 2Msps 16 100MHz DC1805A-B LTC2378CMS-16 1Msps 16 50MHz DC1805A-C LTC2377CMS-16 500ksps 16 25MHz DC1805A-D LTC2376CMS-16 250ksps 16 12.5MHz DC1805A-E LTC2379CMS-18 1.6Msps 18 99.2MHz DC1805A-F LTC2378CMS-18 1Msps 18 62MHz DC1805A-G LTC2377CMS-18 500ksps 18 31MHz DC1805A-H LTC2376CMS-18 250ksps 18 15.5MHz Quick Start Procedure Figure 2. DC1805A Test Diagram dc1805af 2 DEMO MANUAL DC1805A Quick Start Procedure This board is tested by measuring the distortion at the differential output given a -1dBFS, 2kHz single-ended input as shown in Figure 2. For SINAD, THD or SNR testing a low noise, low distortion generator such as Audio Precision SYS-2722, B&K Type 1051 or Stanford Research DS360 should be used. A low jitter RF oscillator such as the Marconi Instruments, Multisource Generator 2026 should be used as the clock source. To test the boards please follow the steps below: 1) Make sure that all the jumpers are set as shown in Figure 2 (DC1805A Test Diagram). 2) Power up the board by applying 9VDC. 3) Apply the clock signal to connector J1. Clock frequency 99.2MHz (to achieve 1.6Msps conversion rate, please refer to the Clock Source section for more detailed information), VIN 3.3VP-P. 4) A single pole lowpass filter should be used for best SNR measurement data. One option is to create an onboard RC low pass filter by populating R5 with 200 and C33 with 0.22F. It is very important to use a very low distortion capacitor. In order to balance both inputs of the LTC6362 populate R12 with a 200 resistor in parallel with a 0.22F capacitor. 5) Apply a 2kHz, -1dBFS signal to connector J3. The performance that results from these connections are displayed in Figure 4. DC718 Quick Start Procedure Check to make sure that all switches and jumpers are set as shown in the connection diagram of Figure 1. The default connections configure the ADC to use the onboard reference and regulators to generate the required common mode voltages. The analog input is DC coupled. Connect the DC1805A to a DC718 USB high speed data collection board using connector J4. Then, connect the DC718 to a host PC with a standard USB A/B cable. Apply 9V to the indicated terminals. Then apply a low jitter signal source to J3. Connect a low jitter 100MHz 3.3VP-P sine wave or square wave to connector J1. Note that J1 has a 50 termination resistor to ground. Run the QuikEval-II software (Pscope.exe version K72 or later) supplied with the DC718 or download it from www.linear.com. Complete software documentation is available from the Help menu. Updates can be downloaded from the Tools menu. Check for updates periodically as new features may be added. The PScopeTM software should recognize the DC1805A and configure itself automatically. Click the Collect button (see Figure 4) to begin acquiring data. The Collect button then changes to Pause, which can be clicked to stop data acquisition. DC590B Setup IMPORTANT! To avoid damage to the DC1805A, make sure that VCCIO (JP5) is set to 3.3V before connecting the DC590B to the DC1805A. controller using the supplied 14-conductor ribbon cable. Run the evaluation software supplied with the DC590B or download it from www.linear.com. Connect the DC590B to a host PC with a standard USB A/B cable. Connect the DC1805A to a DC590B USB serial The correct control panel will be loaded automatically. Click the Collect button to begin reading the ADC. dc1805af 3 DEMO MANUAL DC1805A DC1805A Setup DC Power Reference The DC1805A requires 9VDC and draws less than 70mA. Most of the supply current is consumed by the CPLD, regulators and discrete logic on the board. The 9VDC input voltage powers the LTC6362 and the ADC through LT(R)1763 regulators which provide protection against accidental reverse bias. Additional regulators provide power for the CPLD. See Figure 1 for connection details. The default reference is a LTC6655 5V reference. An external reference can be used by removing (U3) and populating (R6) with 0 resistor. If an external reference is used it must settle quickly in the presence of glitches on the REF pin. Clock Source You must provide a low jitter 3.3VP-P maximum sine or square wave to J1. The clock input is AC-coupled so the DC level of the clock signal is not important. A generator like the Marconi Instruments, Multisource Generator 2026, HP8644 or the DC1216A-A is recommended. Even a good generator can start to produce noticeable jitter at low frequencies. Therefore it is recommended for lower sample rates to divide down a higher frequency clock to the desired sample rate. The ratio of clock frequency to conversion rate is 62:1 for 18-bit parts and 50:1 for 16-bit parts. If the clock input is to be driven with logic, it is recommended that the 50 terminator (R1) be removed. Slow rising edges may compromise the SNR of the converter in the presence of high amplitude higher frequency input signals. R17 1k R15 1k AIN+ R26 1k LTC6362 R27 1k LTC6362 drives the analog input of the LTC2379-18 on the DC1805A as shown in Figure 3. This circuit converts a single-ended input signal to a differential output signal applied at the ADC inputs. Please refer to the LTC6362 data sheet for various configurations of the LTC6362 interface to the SAR ADC. AC-coupling the input may degrade the distortion performance of the ADC due to nonlinearity of the coupling capacitor. Component Selection When driving a low noise, low distortion ADC such as the LTC2379-18 with the LTC6362, component selection is important so as to not degrade performance. Resistors should have low values to minimize noise and distortion. Metal film resistors are recommended to reduce distortion caused by self heating. To further reduce distortion, NPO or silver mica capacitors should be used because of their low voltage coefficients. C27 NPO 3900pF R18 35.7 + - Analog Input R28 35.7 R19 0 0402 + C26 NPO 3900pF R19 0 0402 C29 NPO 3900pF LTC2379-18 - DC1805A F03 Figure 3. LTC6362 Ground Referenced Single-Ended to Differential Converter dc1805af 4 DEMO MANUAL DC1805A DC1805A Setup Jumpers JP1 - Sets the DC bias for VOCM of the LTC6362 to be internally biased or externally driven. The voltage on this pin sets the output common mode voltage level. VREF /2 is the default setting. JP2 - Toggles the LTC6362 On and Off. Part On (5V) is the default setting. JP4 - Ties the WP pin to VCC or GND. WP is the hardware write-protect pin. If tied to VCC, hardware write protection is enabled. If WP is tied to GND, the hardware writeprotection is disabled. JP5 - VCCIO sets the output levels at J3 to either 3.3V or 2.5V. Use 3.3V to interface to the DC718 which is the default setting. JP3 - In the REF position the Digital Gain Compression is off and the analog input range at ADC inputs is 0V to VREF. In the GND position Digital Gain Compression is turned on and the analog input range at ADC inputs is 0.1VREF to 0.9VREF. Figure 4. PScope Screenshot dc1805af 5 DEMO MANUAL DC1805A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 14 C1, C2, C3, C4, C6, C7, C8, C10, C15, C16, C18, C20, C21, C28 Capacitor, X7R, 0.1F, 25V, 10%, 0603 AVX, 06033C104KAT2A 2 5 C22, C35, C38, C41, C44 Capacitor, X7R, 1F, 16V, 10%, 0603 AVX, 0603YC105KAT2A 3 1 C9 Capacitor, X5R, 47F 6.3V, 20%, 0805 Taiyo Yuden, JMK212BJ476MG-T 4 7 C5, C11, C17, C37, C40, C43, C46 Capacitor, X5R, 10F 6.3V, 20%, 0603 TDK, C1608X5R0J106MT 5 1 C12 Capacitor, X7R, 4.7F 10V, 10%, 0805 AVX, 0805ZC475KAT2A 6 1 C19 Capacitor, X7R, 0.1F, 25V, 5%, 0805 AVX, 08053C104JAT2A 7 1 C24 Capacitor, X7R, 0.01F, 16V,10%, 0402 AVX, 0402YC103KAT2A 8 0 C13, C14, C23, C25, C30, C31, C32, C33 Capacitor, 0603 OPT 9 3 C26, C27, C29 Capacitor, Ceramic 3900pF, 100V NPO,1206 AVX, 12061A392JAT2A 10 1 C34 Capacitor, X5R, 22F 16V, 20%, 1210 Taiyo Yuden, EMK325BJ226MM-T 11 4 C36, C39, C42, C45 Capacitor, X7R, 0.01F, 16V,10%,0603 AVX, 0603YC103KAT 12 8 C47, C48, C49, C50, C51, C52, C53, C54 Capacitor, X7R, 0.1F, 16V,10%, 0402 TDK, C1005X7R1C104KT 13 5 E1, E2, E3, E4, E5, E6, E7, E8, E9 TP, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0 14 3 J1, J2, J3 Connector, BNC-5PINS Connex, 112404 15 1 J4 Connector, 40 Pins SMT, CON-EDGE40-100 Samtec, TSW-120-07-L-D 16 1 J5 Header, 2x7, 0.079" Molex, 87831-1420 17 1 J6 Header, 2x5, 0.100", HD2X5-100 Samtec, TSW-105-07-L-D 18 5 JP1-JP5 Jumper, 1x3, 0.100", HD1X3-100 Samtec, TSW-103-07-L-S 19 1 R1 Resistor, Chip 49.9, 1%, 1206 NIC, NRC12F49R9TRF 20 11 R2, R3, R13, R14, R15, R17, R20, R21, R26, R27, R30 Resistor, Chip 1k, 1%, 0603 NIC, NRC06F1001TRF 21 5 R4, R7, R8, R9, R44 Resistor, Chip 33, 1%, 0603 NIC, NRC06F33R0TRF 22 4 R5, R10, R12, R23 Resistor, Chip 0, 1%, 0603 NIC, NRC06F0000TRF 23 0 R6, R11, R16, R24, R25 Resistor, 0603 OPT 24 2 R18, R28 Resistor, Chip 35.7, 1%, 0603 Vishay, CRCW060335R7FKEA 25 2 R19, R29 Resistor, Chip 0, 1/16W, 1%, 0402 NIC, C04F0000TRF 26 1 R22 Resistor, Chip 2k, 1%, 0603 NIC, NRC06F2001TRF 27 3 R31, R32, R33 Resistor, Chip 4.99k, 1%, 0603 NIC, NRC06F4991TRF 28 1 R34 Resistor, Chip 10k, 1%, 0402 NIC, NRC04F1002TRF 29 4 R36, R37, R38, R40 Resistor, Chip 1k, 1%, 0402 NIC, NRC04F1001TRF 30 1 R39 Resistor, Chip 10k, 1%, 0603 NIC, NRC06F1002TRF 31 1 R41 Resistor, Chip 2.80k, 1%, 0603 NIC, NRC06F2801TRF 32 1 R42 Resistor, Chip 1.69k, 1%, 0603 NIC, NRC06F1691TRF 33 1 R43 Resistor, Chip 1.54k, 1%, 0603 NIC, NRC06F1541TRF 34 2 U1, U6 IC., Tinylogic UHS Inverter, SC70-5 Fairchild, NC7SZ04P5X 35 2 U2, U5 IC., Tinylogic ULP-A Unbuffered Inverter, SC70-5 Fairchild, NC7SVU04P5X 36 1 U3 IC., LTC6655CHMS8-5, MS8 Linear Technology, LTC6655CHMS8-5#PBF 37 1 U4 IC., Single D Flip Flop, US8 ON Semiconductor, NL17SZ74 (USG) 38 1 U7 IC., Single SPST Bus Switch, SC70-5 Fairchild, NC7SZ66P5X 39 1 U9 IC., LTC6362CMS8, MS8 Linear Technology, LTC6362CMS8 40 1 U10 IC., Serial EEPROM, TSSOP Microchip, 24LC024-I/ST dc1805af 6 DEMO MANUAL DC1805A parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 41 1 U11 IC., LT1763CS8-1.8, SO8 Linear Technology, LT1763CS8-1.8#PBF 42 1 U12 IC., LT1763CS8, SO8 Linear Technology, LT1763CS8#PBF 43 1 U13 IC., MAX II Family, TQFP100 Altera, EPM240GT100C5N 44 1 U14 IC., LT1763CS8-2.5, SO8 Linear Technology, LT1763CS8-2.5#PBF 45 1 U15 IC., LT1763CS8-5, SO8 Linear Technology, LT1763CS8-5#PBF 46 4 MH1-MH4 Stand-Off, Nylon (Snap On), 0.375" Tall Keystone, 8832 (Snap On) 47 5 Shunts as Shown on Assembly Drawing (JP1-JP5) Shunt, .100" Center Samtec, SNT-100-BK-G 48 2 Stencil for Top and Bottom Stencil #DC1805A-2 DC1805A-A 1 1 DC1805A-A General BOM 2 1 U8 IC., LTC2380CMS-16, MS16 Linear Technology, LTC2380CMS-16 3 0 R35 (OPT) Resistor, Chip 300, 1%, 0402 OPT DC1805A-B 1 1 DC1805A-B General BOM 2 1 U8 IC., LTC2378CMS-16, MS16 Linear Technology, LTC2378CMS-16 3 0 R35 (OPT) Resistor, Chip 300, 1%, 0402 OPT DC1805A-C General BOM DC1805A-C 1 1 2 1 U8 IC., LTC2377CMS-16, MS16 Linear Technology, LTC2377CMS-16 3 0 R35 (OPT) Resistor, Chip 300, 1%, 0402 OPT DC1805A-D 1 1 DC1805A-D General BOM 2 1 U8 IC., LTC2376CMS-16, MS16 Linear Technology, LTC2376CMS-16 3 0 R35 (OPT) Resistor, Chip 300, 1%, 0402 OPT DC1805A-E 1 1 DC1805A-E General BOM 2 1 U8 IC., LTC2379CMS-18, MS16 Linear Technology, LTC2379CMS-18 3 1 R35 Resistor, Chip 300, 1%, 0402 NIC, NRC04F3000TRF DC1805A-F 1 1 DC1805A-F General BOM 2 1 U8 IC., LTC2378CMS-18, MS16 Linear Technology, LTC2378CMS-18 3 1 R35 Resistor, Chip 300, 1%, 0402 NIC, NRC04F3000TRF DC1805A-G 1 1 DC1805A-G General BOM 2 1 U8 IC., LTC2377CMS-18, MS16 Linear Technology, LTC2377CMS-18 3 1 R35 Resistor, Chip 300, 1%, 0402 NIC, NRC04F3000TRF DC1805A-H General BOM DC1805A-H 1 1 2 1 U8 IC., LTC2376CMS-18, MS16 Linear Technology, LTC2376CMS-18 3 1 R35 Resistor, Chip 300, 1%, 0402 NIC, NRC04F3000TRF dc1805af 7 A B C D AIN+ EXT VOCM AIN- CLK 100MHz Max 3.3Vpp J3 BNC R1 49.9 1206 R24 OPT R23 0 E2 JP1 R11 OPT R10 0 BNC EXT VCM BNC C22 1uF E9 J2 J1 5 C31 OPT C13 OPT C14 OPT R2 1k R5 0 R3 1k 2 5 3 R25 OPT C33 OPT R16 OPT 4 C32 OPT 6.3V C23 OPT 6.3V R12 0 R26 1K R15 1K R14 1K R13 1K U1 NC7SZ04P5X C2 0.1uF 2 5 +3.3V 3 JP2 C15 0.1uF U9 LTC6362CMS8 SHDN PWR ON 4 +5V U2 NC7SVU04P5X C3 0.1uF 33 R4 7 C1 0.1uF 8 IN+ 4 R17 1k CLK +5V 4.7uF 0805 C12 0.1uF C16 0.01uF 0402 C24 R27 1k IN- C30 OPT C25 OPT R28 35.7 R18 35.7 C26 3900pF NP0 1206 9V-10V C4 0.1uF C29 3900pF NPO 1206 C27 3900pF NPO 1206 4 3 2 1 GND C18 0.1uF R6 OPT E1 -H 3 SDO BUSY RD 14 11 12 SDO R20 1k SCK 13 REF GND C8 0.1uF CNV SDO 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. RD BUSY 2 J5 DC590 7 8 2 4 6 8 10 12 14 4 U6 NC7SZ04P5X DC590_DETECT +3.3V TO CPLD HD2X7-079-MOLEX 1 3 5 7 9 11 13 4 1 R9 33 PR VCC SCK CNV 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE 9V-10V OE A 0.1uF 0805 C19 CLR GND 2 C28 0.1uF R8 33 SCALE = NONE NC ERJON Q. PCB DES. APP ENG. APPROVALS CNV SCK R22 2k R21 1k C6 0.1uF C20 0.1uF 2 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. B 6 4 U4 NL17SZ74 +3.3V +3.3V U7 NC7SZ66P5X NOTE: UNLESS OTHERWISE SPECIFIED LTC2376CMS-18 18 18 0.5 0.25 18 1.0 LTC2378CMS-18 -F LTC2377CMS-18 18 1.6 LTC2379CMS-18 16 0.25 LTC2376CMS-16 BITS 16 16 16 R30 1k ROL/SDI BUSY -D -E -G SCK SDO 9 JP3 REF CNV C9 47uF 6.3V 0805 MSPS 2.0 1.0 LTC2377CMS-16 0.5 U8 IN- IN+ C10 0.1uF C5 10uf LTC2380CMS-16 LTC2378CMS-16 5 4 * U8 LTC23XXCMS C11 10uF 6.3V 5 -A -B -C R29 0 0402 R19 0 0402 C17 10uF 6.3V +3.3V GND 6 7 8 EXT REF ASSY * +2.5V GND GND VOUT_S VIN VOUT_F SHDN U3 LTC6655CHMS8-5 33 R7 1 Q 3 +3.3V VDD GND 3 8 REF/SEL 2 D CP Q 5 3 OVDD GND 6 2 GND 10 15 GND 16 6 1 SHDN VOCM 7 REF CHAIN 1 5 VCC GND 3 5 2 VV+ 3 OUTOUT+ 4 5 3 +3.3V 4 8 VCC VSS 4 31 29 27 25 23 21 19 17 15 13 11 9 7 DB3 DB4 DB5 DB6 DB7 DB8 DB9 DB10 DB11 DB12 DB13 DB14 DB15 3 2 1 6 5 7 DATE: N/A SIZE 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 R33 4.99k 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 DATE 10-14-11 10-14-11 IC NO. 1 LTC6362CMS8 DC1805A SHEET 1 OF 2 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PROG WP R32 4.99k 3201S-40G1 1 3 TECHNOLOGY JP4 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 DB16 DB17 CNVST_33 ERJON Q. APPROVED LTC6362 DRIVING 18 - BIT SAR ADC TITLE: SCHEMATIC A2 A1 A0 SCL SDA WP 33 DB2 R31 4.99k 35 5 37 39 J4 FROM CPLD DB17 DB16 2 C7 0.1uF PRODUCTION FAB DB1 CLKOUT U10 24LC024-I/ST C21 0.1uF +3.3V 1 DESCRIPTION REVISION HISTORY DB0 NC7SVU04P5X U5 2 - 4 REV ECO 5 8 3 5 A B C D DEMO MANUAL DC1805A Schematic Diagram dc1805af 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. A B C D IO21 IO20 IO19 IO18 IO17 IO16 IO15 IO8 IO7 IO6 IO5 IO4 IO3 IO2 IO1 21 20 19 18 17 16 15 8 7 7 5 3 1 8 6 4 2 C48 0.1uF JP2X5/100 9 10 JTAG J6 5 C50 0.1uF IO50 IO49 IO48 IO47 IO42 IO41 IO40 IO39 IO38 IO37 IO36 IO35 IO34 IO33 IO30 IO29 50 49 48 47 42 41 40 39 38 37 36 35 34 33 30 29 28 27 26 C51 0.1uF 0402 X 8 PLCS C49 0.1uF IO21 R40 1k 0402 DB15 CLKOUT 5 R39 10k DB14 4 CNVST_33 DB13 3 6 IO27 DB12 2 IO28 IO26 DB11 U13B EPM240T 1 C47 0.1uF +3.3V +3.3V U13A EPM240T R35 300 0402 R34 10k 0402 +3.3V C52 0.1uF C53 0.1uF 1K R38 +1.8V 1K R37 R36 1K 13 63 9 31 45 59 80 94 C54 0.1uF CLK IO38 BUSY SCK 12 CNTRL TDO TCK TDI TMS DEV_CLRN DEV_OE GCLK3 GCLK2 GCLK1 POWER VCCINT VCCINT VCCIO1 VCCIO1 VCCIO1 VCCIO2 VCCIO2 VCCIO2 U13F EPM240T 25 24 23 22 44 43 64 62 14 GCLK0 U13E EPM240T IO75 IO74 IO73 IO72 IO71 IO70 IO69 IO68 IO67 IO66 IO61 IO58 IO57 SCK RD IO56 IO55 IO54 IO53 IO52 IO51 SDO 0402 X 3 PLCS 33 R44 DC590_DETECT U13C EPM240T 75 74 73 72 71 70 69 68 67 66 61 58 57 56 55 54 53 52 51 4 GND GND GND GND GND GND GND GND 4 10 11 32 46 60 93 65 79 IO96 DB2 IO100 IO99 IO98 IO97 IO95 DB1 DB0 IO92 IO91 IO90 IO89 IO88 IO87 IO86 IO85 IO84 IO83 IO82 IO81 IO78 IO77 IO76 DB17 DB16 IO68 IO56 U13D EPM240T 100 99 98 97 96 95 92 91 90 89 88 87 86 85 84 83 82 81 78 77 76 DB10 DB9 DB8 DB7 IO86 DB6 DB5 DB4 DB3 GND 9V-10V 3 3 E4 E3 9V-10V C34 22uF 16V 1210 5 8 5 8 5 8 SHDN IN LT1763CS8-5 U15 SHDN IN LT1763CS8-2.5 U14 SHDN IN U12 LT1763CS8 SHDN 1 4 2 BYP SEN OUT BYP SEN OUT BYP SEN OUT BYP SEN OUT 1 4 2 1 4 2 1 4 2 2 SCALE = NONE ERJON Q. NC APPROVALS C45 0.01uF C42 0.01uF C39 0.01uF C36 0.01uF THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE 5 IN U11 LT1763CS8-1.8 2 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. C44 1uF 16V 9V-10V C41 1uF 16V 9V-10V C38 1uF 16V 9V-10V C35 1uF 16V 8 GND GND GND 3 6 7 GND GND GND 3 6 7 GND GND GND 3 6 7 GND GND GND 3 6 7 5 DATE: N/A SIZE 6-1-11 IC NO. R41 2.80k C46 10uF 6.3V E8 E7 +3.3 V +5 V +2.5 V E6 +1.8 V 1 LTC6362CMS8 DC1805A SHEET 2 OF 2 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only +5V E5 C40 10uF 6.3V C43 10uF 6.3V C37 10uF 6.3V +3.3V +2.5V R43 1.54k R42 1.69k +1.8V LTC6362 DRIVING 18 - BIT SAR ADC TECHNOLOGY JP5 TITLE: SCHEMATIC +3.3V VCCIO +2.5V 1 A B C D DEMO MANUAL DC1805A Schematic Diagram dc1805af 9 DEMO MANUAL DC1805A 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 (c) 2004, Linear Technology Corporation dc1805af 10 Linear Technology Corporation LT 0412 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2012