DEMO MANUAL DC043 Micropower A/D Demo Board DEMO MANUAL DC043 LTC1286 Micropower 12-Bit A/D Converter Demo Board U DESCRIPTIO The LTC 1286 is a micropower, 12.5ksps, sampling analog input range information. Additionally, a schematic, 12-bit A/D converter which draws only 1.25mW from a parts list, drawings and dimensions of all the PC board single 5V supply. The LTC1286 demo board provides the layers are included. An explanation of the layout and user with a way to evaluate the LTC1286 A/D converter. In bypass strategies used in this board is also included so addition, the LTC1286 demo board is intended to illustrate that anyone designing a PC board using the LTC1286 will the layout and bypassing techniques required to obtain be able to get the maximum performance from the device. optimum performance from this part. The LTC1286 demo board is designed 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 LTC1286 is a very space n efficient solution for A/D users. By combining a mi- Proven Power 12-Bit ADC Surface Mount Layout 2 n cropower 12-bit A/D, sample-and-hold, serial port and Actual ADC Footprint Only 0.1 Inch Including Bypass Capacitors auto shutdown circuit into a single 8-pin SOIC package, all n the data acquisition circuitry including the bypass caps 71dB SINAD, 84dB THD and 0.25LSB DNL n can be placed into an area of only 0.1 square inch. Gerber Files for This Circuit Board Are Available. Call the LTC Factory. This manual shows how to use the demo board. Included , LTC and LT are registered trademarks of Linear Technology Corporation. are timing diagrams, power supply requirements and 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 RATE (kHz) LT1286/98 G03 DC043 BP01 Actual Size 1 SUPPLY CURRENT (A)+ + DEMO MANUAL DC043 W W SCHEMATIC DIAGRAM 2 TOP VIEW V 1 8 V REF CC 2 CLK +IN 7 LTC1286 IN 3 6 D OUT 3 14 GND 4 5 CS/SHDN A QA 4 13 B QB N8 PACKAGE 5 12 U5C U5D C QC 8-LEAD PLASTIC DIP R15 6 11 74HC14 74HC14 7V + D QD 1k V 5V 15 56 98 RDY TO RCO 7 15V C10 ENP J2 10 15pF DATA DISPLAY ENT U5A U5B 2 R1 TO R12 D1 TO D12 CLK 74HC14 74HC14 GND 9 620 LED 12 34 DATA J3 LOAD 1 CLR R1 AGND DGND D0 U4 D1 74HC161 D2 JP6 U2 D3 16-PIN HEADER 74HC595 14 15 U5F U5E CLK SER QA 1 D0 1 74HC14 74HC14 INPUT QB 2 D1 CLK IN 13 12 11 10 2 J1 11 SRCLK QC BNC 3 3 D2 QD R14 10 4 D4 51 5V SRCLR QE 4 D3 5 V D5 CC QF JP7 5 D4 6 12 D6 RCLK QG 7 JP2 JP3 JP4 6 D5 QH D7 2 2 2 13 9 C11 7 D6 GND QH U1 0.1F ANALOG LTC1286 SERIAL 8 D7 INPUT 1 8 I/O V V REF CC 1 1 1 9 D8 +IN 2 7 1 D8 14 15 E1 +IN CLK SER QA IN 3 6 2 10 D9 1 E2 IN D D9 OUT QB 4 5 3 11 2 GND CS/SHDN 11 D10 D10 SRCLK QC 3 12 D11 74HC595 QD JP5 D11 LTC1286 10 4 3-PIN SRCLR QE 12-BIT MICROPOWER SERIAL ADC 13 RDY R12 5 HEADER QF 12 6 14 DATA RCLK QG 7 15 GND QH 13 9 JP1 GND QH 16 GND LED ENABLE U3 + + U7 V U6 V CC V 5V 5V 74HC595 LT1021D-5 LT1121-5 2 6 1 3 V V V OUT IN OUT IN 1 8 NC NC NOTE: UNLESS OTHERWISE SPECIFIED 3 7 C8 C5 NC NC C9 C7 C1 C2 C3 C4 1. ALL RESISTANCES IN OHMS, 1/8W, 5%. 10F 47F 0.1F 0.1F 0.1F 0.1F 0.1F 0.1F 2. ALL CAPACITANCES IN F, 20%. GND TRIM TAB GND 25V 16V 3. ALL 74HCXXX CONNECTED TO 5V and DGND. 4 5 4 2 U2 TO U5 74HCXXX BYPASS CAPACITORS DC043 SD