DEMO MANUAL DC115 12-BIT RAIL-TO-RAIL CONVERTER LTC1451 (5V) and LTC1453 (3V) D/A Converters U DESCRIPTIO The LTC 1451/LTC1453, respectively, are 5V and 3V 12- GPIO parallel bus to drive the LTC1451/LTC1453. The user bit, rail-to-rail output D/A converters. The LTC1451 draws can also drive the LTC1451/LTC1453 CLK, D and CS/LD IN 2mW and the LTC1453 draws 0.75mW. Both of these inputs directly through connections to the appropriate parts are monotonic over the industrial temperature range, terminals. The outputs of the parallel-to-serial conversion with differential nonlinearity guaranteed to be less than circuitry are brought out to these same terminals for 0.5LSB. The LTC1451 and LTC1453 are complete with a monitoring or driving other serial parts. The rail-to-rail rail-to-rail output buffer amplifier and reference in an SO- voltage output of the LTC1451/LTC1453 is available on a 2 8 package that occupies just 0.1 inch , including a bypass BNC connector and the onboard reference of the LTC1451/ capacitor. The low power supply current and small size LTC1453 is brought out to a terminal. This manual shows makes these circuits ideal for portable battery-powered how to use this demonstration board and includes a timing applications. In addition, these circuits are also used for diagram for driving the part with a 12-bit bus. Additionally, digital calibration, industrial process control and ATE. The a schematic, parts list, drawings and dimensions of all the LTC1451/LTC1453 demonstration board allows the user PC board layers are included. An explanation of the layout to evaluate the LTC1451 and LTC1453 12-bit rail-to-rail strategy is also provided. Gerber files for this circuit D/A converters. In addition, the LTC1451/LTC1453 dem- board are available. Call the LTC factory. onstration board is intended to demonstrate layout and Some key features of this demonstration board include: bypassing techniques required to obtain optimum perfor- 0.5LSB Max Differential Nonlinearity (0.2LSB typ) mance from these parts. The demonstration board is designed to be easy to use and requires only one 7V to 15V Rail-to-Rail Output Capability supply. Since these DACs have a 3-pin serial interface (SPI Convenient 12-Bit Parallel-to-Serial Converter and QSPI compatible), the demonstration board includes parallel-to-serial conversion circuitry. The user can set Separate Prototype Area any 12-bit code by means of dip switches, or connect a , LTC and LT are registered trademarks of Linear Technology Corporation. WUU TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO Differential Nonlinearity vs Input Code Demo Board 0.5 0.0 0.5 4095 0 512 1024 1536 2048 2560 3072 3584 CODE 1451/2/3 TA02 1 DNL ERROR (LSB) DEMO MANUAL DC115 12-BIT RAIL-TO-RAIL CONVERTER U W W PACKAGE AND SCHEMATIC DIAGRAMS 2 TOP VIEW CLK 1 8 V CC D 2 7 V IN OUT LTC1451/LTC1453 CS/LD 3 6 REF D GND 4 5 OUT S8 PACKAGE 8-LEAD PLASTIC SO U1A U2A U2B 7V TO 15V E1 E2 74HC132 74HC04 74HC04 + 1 31 2 34 2 C3, 47F U4 LT1121 3.3V/5V R7 C1 R26 REGULATOR U1B 10 11.8k 120pF 1 8 74HC132 U1C V OUT IN 5 CC 2 7 6 74HC132 C2 4 NC/ADJ NC 10 1 10F 3 6 8 GND NC 9 6 4 5 Q CL U2C NC SHDN 3 U3A 74HC04 CLK 74HC74 5 2 56 Q PR D R28, 5.1k 4 SW1 R1 R13 V CC U7, 74HC165 10k 200k 1 16 DB11 (MSB) DB11 (MSB) 10 J1 SER V CC C4 C5 2 15 DB10 DB10 DB4 11 V OUT A 10F 0.1F 3 14 DB9 DB9 DB5 12 U6, 74HC163 B 4 13 DB8 DB8 DB6 13 3 14 C A QA 1 8 4 13 5 12 DB7 DB7 DB7 14 CLK V B QB CC D 2 7 6 11 DB6 DB6 DB8 3 5 12 D V IN OUT E C QC E3 3 6 6 11 7 10 DB5 DB5 DB9 4 CS/LD REF D QD F 4 5 8 9 DB4 DB4 DB10 5 15 V REF D GND OUT G RCO 7 DB11 (MSB) 6 9 E4 ENP U2F LT1451-3 H QH SW2 7 10 74HC04 QH ENT GND 2 1 16 DB3 DB3 2 13 12 CLK CLK 15 9 2 15 DB2 DB2 INH LOAD 1 3 14 DB1 DB1 1 ANALOG PLANE SH/LD CLR 4 13 DB0 (LSB) DB0 (LSB) 5 12 U8, 74HC165 R12 R24 10 10k 6 11 200k SER 11 7 10 A 12 8 9 SELECT JP3 B 1 2 13 C R25 JUMPER 14 5.1k D JP1 V CC DB0 3 STROBE E JP2 1 2 DB1 4 DB10 HEADER 3X2 F JP4 1 2 3 4 DB2 5 DB8 G 5 6 JUMPER DB3 6 9 DB6 H QH 7 8 7 DB4 QH 9 10 2 DB2 CLK JP5 1 2 11 12 15 DB0 INH 13 14 1 JUMPER SH/LD HEADER 7X2 DB1 DB3 V CC DB5 C6 C7 C8 C9 C10 C11 DB7 0.1F 0.1F 0.1F 0.1F 0.1F 0.1F DB9 BYPASS CAPACITOR FOR U1, U2, U3, U6, U7, U8 115A Schematic DB11 (MSB) Demo Board Schematic 1 2 3 4 5 6