LTC1091/LTC1092 LTC1093/LTC1094 1-, 2-, 6- and 8-Channel, 10-Bit Serial I/O Data Acquisition Systems and-holds. On-chip serial ports allow efficient data trans- FEATURES fer to a wide range of microprocessors and microcontrol- n Programmable Features lers. These circuits can provide a complete data acquisi- Unipolar/Bipolar Conversions tion system in ratiometric applications or can be used with Differential/Single-Ended Multiplexer an external reference in others. Configurations The high impedance analog inputs and the ability to n Sample-and-Holds operate with reduced spans (below 1V full scale) allow n Single Supply 5V, 10V or 5V Operation direct connection to sensors and transducers in many n Direct 3- or 4-Wire Interface to Most MPU Serial applications, eliminating the need for gain stages. Ports and All MPU Parallel I/O Ports n Analog Inputs Common Mode to Supply Rails An efficient serial port communicates without external n Resolution: 10 Bits hardware to most MPU serial ports and all MPU parallel n Total Unadjusted Error (A Grade): 1LSB Over Temp I/O ports allowing eight channels of data to be transmitted n Fast Conversion Time: 20m s over as few as three wires. This, coupled with low power n Low Supply Current consumption, makes remote location possible and facili- LTC1091: 3.5mA Max, 1.5mA Typ tates transmitting data through isolation barriers. LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ Temperature drift of offset, linearity and full-scale error are all extremely low (1ppm/ C typically) allowing all grades to be specified with offset and linearity errors of DESCRIPTIO 0.5LSB maximum over temperature. In addition, the A The LTC 1091/LTC1092/LTC1093/LTC1094 10-bit data grade devices are specified with full-scale error and total acquisition systems are designed to provide complete unadjusted error (including the effects of offset, linearity function, excellent accuracy and ease of use when digitiz- and full-scale errors) of 1LSB maximum over tempera- ing analog data from a wide variety of signal sources and ture. The lower grade has a full-scale specification of transducers. Built around a 10-bit, switched capacitor, 2LSB for applications where full scale is adjustable or successive approximation A/D core, these devices include less critical. software configurable analog multiplexers and bipolar and unipolar conversion modes as well as on-chip sample- , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION 1.25 V = 5V CC 1.00 4.7F 5V 0.75 MPU (e.g., 8051) 1 V 8 CC CS P1.4 (V ) REF 0.50 2 7 ANALOG INPUT 1 CH0 CLK P1.3 0V TO 5V RANGE LTC1091 3 6 ANALOG INPUT 2 CH1 D P1.2 OUT 0.25 0V TO 5V RANGE 1091 TA01 SERIAL DATA LINK 4 5 GND D IN FOR 8051 CODE SEE APPLICATIONS INFORMATION 0 SECTION 0 1 2 3 4 5 REFERENCE VOLTAGE (V) 1091 TA02 1 1 LINEARITY ERROR (LSB = V ) REF 1024 U ULTC1091/LTC1092 LTC1093/LTC1094 ABSOLUTEXAI U RATI GS (Notes 1, 2) Supply Voltage (V ) to GND or V ........................ 12V Power Dissipation............................................. 500mW CC Negative Supply Voltage (V ) .................... 6V to GND Operating Temperature Range Voltage LTC1091/2/3/4AC, LTC1091/2/3/4C..... 40 C to 85 C Analog Reference and LTC1091/2 CS Storage Temperature Range ................ 65 C to 150 C Inputs ................................. (V ) 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec.)................ 300 C CC Digital Inputs (except LTC1091/2 CS) .. 0.3V to 12V Digital Outputs ........................ 0.3V to (V + 0.3V) CC PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART TOP VIEW NUMBER NUMBER CS 1 8 V (V ) CC REF CS 1 8 V CC CH0 2 7 CLK +IN 2 7 CLK LTC1091ACN8 LTC1092ACN8 CH1 3 6 D OUT IN 3 6 D OUT LTC1091CN8 LTC1092CN8 GND 4 5 D IN GND 4 5 V REF N8 PACKAGE N8 PACKAGE 8-LEAD PDIP 8-LEAD PDIP T = 110 C, q = 150 C/W (N) JMAX JA T = 110 C, q = 150 C/W (N) JMAX JA TOP VIEW TOP VIEW LTC1093ACN LTC1094ACN CH0 1 20 DV 1 V CC CH0 16 CC LTC1093CN LTC1094CN CH1 2 19 AV 2 CLK CC CH1 15 LTC1093CSW CH2 3 18 CLK 3 CS CH2 14 CH3 4 17 CS 4 D CH3 13 OUT CH4 5 16 D 5 D OUT CH4 12 IN CH5 6 15 D 6 V IN CH5 11 REF + CH6 7 14 REF 7 AGND COM 10 CH7 8 13 REF 8 V DGND 9 COM 9 12 AGND N PACKAGE SW PACKAGE DGND 10 11 V 16-LEAD PDIP 16-LEAD PLASTIC SO WIDE N PACKAGE T = 110 C, q = 150 C/W (N) JMAX JA 20-LEAD PDIP T = 110 C, q = 130 C/W (SW) JMAX JA T = 110 C, q = 150 C/W (N) JMAX JA Consult factory for Industrial and Military grade parts. PRODUCT GUIDE REDUCED SPAN CONVERSION MODES CAPABILITY 5V PART NUMBER CHANNELS UNIPOLAR BIPOLAR (SEPARATE V ) CAPABILITY REF LTC1091 2 l Pin-for-Pin 10-Bit Upgrade of ADC0832 LTC1092 1ll Pin-for-Pin 10-Bit Upgrade of ADC0831 LTC1093 6 ll l l LTC1094 8 ll l l 2 U WU U W W W