DEMO MANUAL DC045 Micropower A/D Demo Board DEMO MANUAL DC045 LTC1298 Micropower 12-Bit A/D Converter Demo Board U DESCRIPTIO The LTC 1298 is a micropower, 11.1ksps, two-channel This manual shows how to use the demo board. It includes sampling 12-bit A/D converter that draws only 1.25mW timing diagrams, power supply requirements, and analog from a single 5V supply. The LTC1298 demo board pro- input range information. Additionally, a schematic, parts vides the user with a stable and consistent platform on list, drawings, and dimensions of all the PC board layers which to evaluate the LTC1298 A/D converter. In addition, are included. Finally, an explanation of the layout and the LTC1298 demo board illustrates the layout and by- bypass strategies used in this board allows anyone de- passing techniques required to obtain optimum perfor- signing a PC board to achieve maximum performance mance from this part. The LTC1298 demo board is de- from the device. signed to be easy to use and requires only a 7V to 15V supply, a clock signal, and an analog input signal. As FEATURES shown in the Board Photo, the LTC1298 is a very space n Proven Power 12-Bit ADC Surface Mount Layout efficient solution for A/D users. By combining a mi- n On-Chip Two-Channel Mulitplexer cropower 12-bit A/D, sample-and-hold, two-channel mul- 2 n Actual ADC Footprint Only 0.1 Inch Including tiplexer, serial port, and auto shutdown circuit into a single Bypass Capacitors 8-pin SOIC package, all the data acquisition circuitry n 71dB SINAD, 84dB THD and 0.25LSB DNL including the bypass caps occupy an area of only 0.1 n Gerber Files for This Circuit Board Are Available. square inch. Call the LTC Factory. , LTC and LT are registered trademarks of Linear Technology Corporation. W U U TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO Supply Current vs Sample Rate 1000 T = 25C A V = V = 5V CC REF f = 200kHz CLK 100 LTC1298 LTC1286 10 1 0.1k 1k 10k 100k SAMPLE FREQUENCY (Hz) LT1286/98 G03 DC045 BP01 1 SUPPLY CURRENT (A)DEMO MANUAL DC045 W W SCHEMATIC DIAGRAM 2 TOP VIEW CS/SHDN 1 8 V (V ) CC REF CH0 2 7 CLK LTC1298 5V CH1 3 6 D OUT 5V GND 4 D GND 5 IN 15 9 1O E1 A RC0 SER 1 11 N8 PACKAGE B A R15 R14 R13 2 12 8-LEAD PLASTIC DIP 22k 22k 22k C B 3 13 S1 D C AGND CONNECTED TO GND 4 14 1 6 E D SGL/DIFF ONLY IN ONE PLACE 5 3 2 5 F E ODD/SIGN 6 4 3 4 U1 U2 G F MSBF 7 74HC592 74HC165 5 JP3 H G U5A J1 6 1 2 H 74HC14 12 CLK INPUT 3 4 C CLKEN 12 11 5 6 C CLK 14 9 2 C QH CLK 7 8 LOAD R18 10 7 15 U5E U5F C 9 10 QH INH CLR 51 R16 13 1 74HC14 74HC14 11 12 R SH/LD CLK 1k 11 10 13 12 RDY LED 13 14 R1 ENABLE 620 U5B U5C U5D D0 C10 R17 74HC14 74HC14 74HC14 15pF D1 10k U7 43 65 98 5V JP1 74HC595 D2 14 15 C11 SER QA D3 1 47pF QB D4 11 2 SR QC CLK 3 D5 QD 10 4 D6 SR QE CLR 5 QF D7 12 6 R QG CLK D8 7 QH V U3 CC 13 9 D9 GND QH LTC1298 D B C A JP2 D10 1 8 CS V CC 2 7 CLK D11 CH0 E3 CH0 CLK D 14 15 3 6 OUT SER QA CH1 E4 CH1 D R12 OUT D 1 4 5 IN 620 AGND E5 GND D QB IN 2 11 CS SR QC CLK 3 QD 10 4 DC045 SD SR QE U6 CLR 5V JP4 5 LT 1121CST-5 QF 5 12 6 7V TO 1 3 R E2 V V QG IN OUT CLK 15V 4 7 QH 3 13 2 9 GND GND QH 2 U8 U4 1 V V CC 5V CC 74HC595 LT1021 2 6 V V IN OUT + C1 + C7 C2 C3 C4 C5 C6 C12 C9 C8 4 5 47F 10F GND TRIM 0.1F 0.1F 0.1F 0.1F 1F 1F 1F 0.1F 10V 10V