LTC1294CCSW Linear Technology, LTC1294CCSW Datasheet
LTC1294CCSW
Specifications of LTC1294CCSW
Related parts for LTC1294CCSW
LTC1294CCSW Summary of contents
Page 1
... The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing up to eight channels of data to be transmitted over as few as three wires. LTCMOS trademark of Linear Technology Corporation U 12-Bit Data Acquisition System with Power Shutdown R B 5.1k ...
Page 2
... CH2 CH3 LTC1293CCSW CH4 LTC1293DCSW CH5 COM DGND N PACKAGE, 16-LEAD PDIP T JMAX CH0 CH1 CH2 LTC1294BCSW CH3 LTC1294CCSW CH4 LTC1294DCSW CH5 CH6 CH7 COM DGND N PACKAGE, 20-LEAD PDIP T JMAX J PACKAGE, 20-LEAD CERDIP T JMAX OBSOLETE PACKAGE Consider the N Package for Alternate Source ...
Page 3
VERTER A D ULTIPLEXER CHARACTERISTICS PARAMETER CONDITIONS Offset Error (Note 4) Linearity Error (INL) (Notes 4, 5) Gain Error (Note 4) Minimum Resolution for which No Missing Codes are Guaranteed Analog and REF Input Range (Note ...
Page 4
LTC1293/LTC1294/LTC1296 U DIGITAL A D ELECTRICAL C DC SYMBOL PARAMETER V High Level Input Voltage IH V Low Level Input Voltage IL I High Level Input Current IH I Low Level Input Current IL V High Level Output Voltage OH ...
Page 5
W U TYPICAL PERFOR A Supply Current vs Supply Voltage 10 CLK = 1MHz T = 25° SUPPLY VOLTAGE (V) LTC1293 G01 Change in Linearity vs Reference Voltage 1.25 1.00 0.75 0.50 ...
Page 6
LTC1293/LTC1294/LTC1296 W U TYPICAL PERFOR A D Delay Time vs Temperature OUT 250 200 MSB FIRST DATA 150 100 LSB FIRST DATA 50 0 – – 100 125 AMBIENT TEMPERATURE (°C) LTC1293 ...
Page 7
CTIO S LTC1293 # PIN FUNCTION DESCRIPTION 1 – 6 CH0 – CH5 Analog Inputs The analog inputs must be free of noise with respect to AGND. 7 COM Common The common pin defines the ...
Page 8
LTC1293/LTC1294/LTC1296 W BLOCK I D AGRA (Pin numbers refer to LTC1294 INPUT 15 D SHIFT IN REGISTER 1 CH0 2 CH1 3 CH2 4 ANALOG CH3 INPUT MUX 5 CH4 6 CH5 7 CH6 ...
Page 9
TEST CIRCUITS START 1 CLK D OUT Voltage Waveform for t CS 0.8V t SSO dis 2.4V SSO Voltage Waveform for for t CLK 0.8V t SSO en SSO 0.8V Voltage Waveform for D Delay Time, t ...
Page 10
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO A The LTC 1293/4 data acquisition component which contains the following functional blocks: 1. 12-bit successive approximation capacitive A/D converter 2. Analog multiplexer (MUX) 3. Sample and hold (S/H) ...
Page 11
PPLICATI S I FOR ATIO Table 1a. LTC1294/6 Multiplexer Channel Selection MUX ADDRESS DIFFERENTIAL CHANNEL SELECTION SGL/ ODD SELECT DIFF SIGN – ...
Page 12
LTC1293/LTC1294/LTC1296 PPLICATI FOR ATIO OUTPUT CODE • • • 0 ...
Page 13
PPLICATI S I FOR ATIO Example 2: The same conditions as Example 1 except COM = 1V. The resulting input span is 1V ≤ ≥ 4V the resulting word is all ...
Page 14
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO Example: Differential Inputs (CH4 CS CLK START SEL1 UNI ODD/ MSBF SEL1/ SEL0 DIFF SIGN HI-Z D OUT *STOPPING THE CLOCK WILL HELP REDUCE POWER CONSUMPTION. CS ...
Page 15
PPLICATI S I FOR ATIO Motorola SPI (MC68HC11) The MC68HC11 has been chosen as an example of an MPU with a dedicated serial port. This MPU transfers data MSB- first and in 8-bit increments. The D ...
Page 16
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO MC68HC11 CODE LABEL MNEMONIC OPERAND COMMENTS LDAA #$50 CONFIGURATION DATA FOR SPCR STAA $1028 LOAD DATA INTO SPCR ($1028) LDAA #$1B CONFIG. DATA FOR PORT D DDR STAA $1009 LOAD ...
Page 17
PPLICATI S I FOR ATIO 8051 CODE LABEL MNEMONIC OPERAND COMMENTS SETB P1.4 CS GOES HIGH CONT MOV A,#87H DIN WORD FOR LTC1294 CLR P1.4 CS GOES LOW MOV R4,#08H LOAD COUNTER LOOP1 RLC A ROTATE ...
Page 18
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO LTC1294. Figure 4 shows an example of an ideal LTC1293/ 4/6 ground plane design for a two sided board. Of course this much ground plane will not always be possible, ...
Page 19
PPLICATI FOR ATIO Source Resistance The analog inputs of the LTC1293/4/6 look like a 100pF capacitor ( series with a 500Ω resistor (R IN gets switched between (+) and (–) inputs once ...
Page 20
LTC1293/LTC1294/LTC1296 PPLICATI FOR ATIO within the minimum settling windows of 2.5µs (“+” input) and 1µs(“–” input) that occurs at the maximum clock rate of 1MHz. Figures 9 and 10 show examples of adequate and ...
Page 21
PPLICATI FOR ATIO Usually V will not be significant. For a 60Hz signal ERROR on the “–” input to generate a 0.25LSB error (300µV) with the converter running at CLK = 1MHz, its peak ...
Page 22
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO a 1.25 reference. If this offset is unacceptable, it can be corrected digitally by the receiving system or by offsetting the “–” input to the LTC1293/4/6. Noise with Reduced V ...
Page 23
PPLICATI FOR ATIO 0 –20 –40 –60 –80 –100 –120 –140 FREQUENCY (kHz) Figure 16a. LTC1294 FFT Plot f = 1kHz 45.4kHz SNR = 72.7dB with ...
Page 24
LTC1293/LTC1294/LTC1296 PPLICATI S I FOR ATIO This means four channels can handle 7mA of input current each. Reducing CLK frequency from a maximum of 1MHz (See typical performance characteristics curves Maxi- mum CLK Frequency vs Source ...
Page 25
PPLICATI S I FOR ATIO A “Quick Look” Circuit for the LTC1294/6 Users can get a quick look at the function and timing of the LTC1294/6 by using the following simple circuit (Figure 23 ...
Page 26
LTC1293/LTC1294/LTC1296 O U TYPICAL A PPLICATI Micropower, 5000V Opto-Isolated, Multichannel,12-Bit Data Acquisition System is Accessed Once Every Two Seconds LT1027 10µF* CH0 DV CC CH1 AV CC CH2 CLK 8 CH3 CS ANALOG INPUTS CH4 D OUT 0–5V RANGE LTC1294 ...
Page 27
... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC1293/LTC1294/LTC1296 U Dimensions in inches (millimeters) unless otherwise noted ...
Page 28
... SEE NOTE (10.008 – 10.643 JMAX 110°C LT/GP 0392 10K REV 0 © LINEAR TECHNOLOGY CORPORATION 1992 0.394 – 0.419 SOL16 12/91 θ JA 150°C/W 0.394 – 0.419 SOL20 12/91 θ JA 150°C/W 129346fs ...