DEMO MANUAL DC178 HIGH SPEED ADC LTC1418 (200ksps) 14-Bit A/D Converter Demo Board U DESCRIPTIO The LTC 1418 is a 4s, 200ksps sampling A/D converter analog input range information. Additionally, a schematic, that draws 15mW. The LTC1418 demo board provides the parts list, drawings and dimensions of all the PC board user with a way to evaluate the LTC1418 A/D converter. layers are included. An explanation of the layout and The LTC1418 is equipped to handle serial or parallel data bypass strategies used in this board is also included, so transfer. The demo board allows the user to select the that anyone designing a PC board using the LTC1418 will desired interface. In addition, the LTC1418 demo board is be able to get the maximum performance from the device. intended to illustrate the layout and bypassing techniques The LTC1418 and its demo board are intended for, but not required to obtain optimum performance from this part. limited to, signal acquisition and processing, high resolu- The LTC1418 demo board is designed to be easy to use tion and industrial data acquisition applications and bat- and requires only 7V to 15V supplies, a conversion- tery-powered equipment, especially those that benefit start signal and an analog input signal (single-ended or from a 2.048V input range. Gerber files for this circuit differential). As shown in the Board Photo, the LTC1418 is board are available. Call the LTC factory. a very space-efficient solution for A/D users. Combining a Some key features of this demo board include: 14-bit A/D, sample-and-hold and reference in a single SO Proven 200ksps 14-bit ADC surface mount layout package allows all the data acquisition circuitry, including 2 Actual ADC footprint is only 0.22 inch including the bypass capacitors, to be placed in an area of only 2 bypass capacitors 0.22 inch when operating on split supplies and only 2 81.5dB SINAD and 94dB THD with a 100kHz full- 0.2 inch with single-supply operation. scale sine wave input This manual shows how to use the demo board. Included are timing diagrams, power supply requirements and , LTC and LT are registered trademarks of Linear Technology Corporation. WUU TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO 4096 Point FFT of LTC1418 Demo Board 0 f = 200kHz SAMPLE f = 97.509765kHz IN 20 SFDR = 94.29 SINAD = 81.4 40 60 80 100 120 010 203054007600 8090 100 FREQUENCY (kHz) 1418 F02b 1 AMPLITUDE (dB)+ DEMO MANUAL DC178 HIGH SPEED ADC U W W PACKAGE AND SCHEMATIC DIAGRAMS 2 LTC1418 Demonstration Board Features Analog Input Signal Buffer, 200ksps Parallel and Serial Data Output 14-Bit ADC, Data Latches and LED Binary Data Display. Latched Conversion Data is Available on the 18-Pin Header, J6 V CC R14 J1 J3 V V U1 V CC LOGIC SS 20 7V TO 7V TO U2 LT1121-5 LT1175-5 0.125W 15V 15V 1 3 2 3 +V IN V V V V IN OUT IN IN V OUT 4 D 00:13 C12 C14 C7 C15 GND TABGND TAB GND C1 R0, 1k 0.1F 0.1F 0.1F 0.1F C2 + C10 D14 + D00 D0 D15 24 22F D00 1 22F 10F SS12 SS12 10V R1 10V D01 D1 10V D01 R2 D02 D2 D02 R3 D03 D3 D03 U5 J2 R4 C4 74HC574 D04 D4 V GND CC D04 0.1F 1 0E R5 D05 D5 B 00:13 11 D05 AGND DGND R6 V B00 2 19 D00 JP3 D06 D6 OUT Q0 D0 D06 B01 3 18 D01 R7 R15 Q1 D1 D07 D7 U3 J4 JP2 + D07 B02 4 17 D02 75 V D2 Q2 LT1363 + 7 R8 A 2 D08 D8 B03 5 16 D03 D08 6 D3 Q3 6 3 B04 15 D04 R9 + D09 D9 D4 Q4 8 R17 D09 1 7 B05 14 D05 4 10k D5 Q5 R10 D10 V D10 8 B13 13 D13 D10 D6 Q6 R11 9 12 D11 D11 C11 C3 U4 D7 Q7 D11 2200pF V SS LTC1418ACG R12 0.1F D12 D12 R18 U6 JP4 R16 D12 1 6 B13 + 10k A D13 74HC574 R13 75 IN D13 D13 2 7 B12 1 D13 A A D12 IN 0E 3 8 B11 11 J5 V D11 REF LED 9 B10 4 D00 B12 2 19 D12 C8 C13 REFCOMP D10 J6-13 D00 D0 Q0 JP1 25 10 B09 1F 10F B11 3 18 D11 D01 D9 CS D1 Q1 J6-14 D01 16V 16V 24 11 B08 TOP VIEW B10 4 17 D10 D8 D02 CONVST D2 Q2 J6-11 D02 23 12 B07 B09 5 16 D09 + D7 D03 RD A 1 28 V D3 Q3 IN DD J6-12 D03 22 13 B06 B08 6 15 D08 D6 SHDN D04 D4 Q4 A 2 27 V IN SS J6-9 D04 J7 21 15 B05 B07 7 14 D07 SER/PAR D5 1 23 4 D5 Q5 D05 3 26 BUSY U7A V CLK U7B 28 16 B04 J6-10 D05 REF B06 8 13 D06 V (EXTCLKIN) D4 DD D6 Q6 D06 4 R19 26 17 B03 REFCOMP 25 CS HC14 HC14 J6-7 D06 9 12 BUSY (SCLK) D3 D7 Q7 51 D07 27 18 B02 AGND 5 24 CONVST J6-8 D07 V (CLKOUT) D2 SS 5 19 B01 V D08 LOGIC (D D13 6 23 RD AGND ) D1 J6-5 D08 OUT 14 20 B00 D09 14 (EXT/INT) D0 DGND J6-6 D09 7 LTC1418ACG 22 SHDN D12 V CC D13 D10 J6-3 D10 D11 8 21 SER/PAR V SS U7 D11 J6-4 D11 HC14 D10 9 20 D0 V CC 1 DUAL D12 11 10 GND J6-1 D12 JP6 V U7E D9 10 19 D1/(D ) 2 LOGIC OUT D13 SUPPLY SELECT 7 J6-2 D13 C9 C5 11 18 D2 HC14 D8 3 SINGLE D13 R23 R21 10F 10F R22 J6-15 D13 D7 12 17 D3 16V 16V 100k 1k 1M 13 12 98 RDY U7D J6-16 RDY (PARALLEL) V U7F LOGIC D6 13 16 D4 DGND JP5C BUSY C6 J6-17 BUSY HC14 HC14 SHDN DGND 14 15 D5 15pF V J6-18 DGND V LOGIC LOGIC 74HC244 JP5B SW PACKAGE 74HC244 B00 EXT/INT 18 2 CS HEADER 28-LEAD PLASTIC SO U8A J8-5 11 9 R20 74HC244 18-PIN U8E 10k D JP5A B01 OUT 17 3 DC178 SCHEMATIC 74HC244 J8-4 SER/PAR U8H 74HC244 16 4 132 U8B LTC1418ACG B02 CLKOUT 15 5 J8-3 U8G 74HC244 74HC244 JP7 7 13 B03 SCLK 14 6 U8F U8C J8-1 74HC244 20 B04 EXTCLKIN 12 8 516 J8-2 U8D U7C EN1 U8 HC14 19 74HC244 NOTES: UNLESS OTHERWISE SPECIFIED EN2 J8-6 1. ALL RESISTOR VALUES IN OHMS, 1/10W, 5% HEADER 10 2. ALL CAPACITOR VALUES IN F, 25V, 20% AND IN pF, 50V, 10% DGND 6-PIN