LTC1297DCN8 Linear Technology, LTC1297DCN8 Datasheet
LTC1297DCN8
Specifications of LTC1297DCN8
Available stocks
Related parts for LTC1297DCN8
LTC1297DCN8 Summary of contents
Page 1
... Because of their accuracy, ease of use and small package size these devices are well suited for digitizing analog signals in remote applications where minimum number of interconnects and power consumption are important. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is trademark of Linear Technology Corporation 5V DO ...
Page 2
... U W ORDER PART NUMBER 8 V LTC1292BIN8 LTC1297BCN8 CC LTC1292CIN8 LTC1297CCN8 7 CLK LTC1292DIN8 LTC1297DCN8 6 D OUT LTC1292BCN8 5 V REF LTC1292CCN8 LTC1292DCN8 =130 C/W (N8) JA LTC1292BCJ8 LTC1297BCJ8 LTC1292CCJ8 LTC1297CCJ8 LTC1292DCJ8 LTC1297DCJ8 =100 C/W (J8) JA OBSOLETE PACKAGE Consider the N8 Package for Alternate Source The denotes the specifications = 25 C ...
Page 3
AC CHARACTERISTICS otherwise specifications are (Note 3) A SYMBOL PARAMETER f Clock Frequency CLK t Analog Input Sample Time SMPL t Conversion Time CONV t Total Cycle Time CYC t Delay Time, CLK to D ...
Page 4
LTC1292/LTC1297 U DIGITAL ELECTRICAL CHARACTERISTICS apply over the full operating temperature range, otherwise specifications are at T SYMBOL PARAMETER CONDITIONS I Positive Supply Current CS High CC CS Low CS High Power Shutdown CLK Off I Reference ...
Page 5
W U TYPICAL PERFOR A LTC1297 Supply Current (Power Shutdown) vs CLK Frequency REF CS HIGH 20 CMOS LOGIC LEVELS 200 400 600 800 1000 CLK FREQUENCY ...
Page 6
LTC1292/LTC1297 W U TYPICAL PERFOR A Maximum Clock Rate vs Source Resistance 1 REF CLK = 1MHz 0 +IN IN 0.6 R SOURCE – –IN 0.4 0.2 0 100 1k 10k ...
Page 7
W BLOCK I D AGRA INPUT SHIFT REGISTER 2 +IN ANALOG 3 INPUT MUX –IN 4 GND TEST CIRCUITS On and Off Channel Leakage Current OFF A POLARITY Load Circuit for t ...
Page 8
LTC1292/LTC1297 TEST CIRCUITS CS CLK D OUT PPLICATI FOR ATIO The LTC1292/LTC1297 are data acquisition components which contain the following functional blocks: 1. 12-Bit Succesive Approximation Capacitive A/D Converter 2. Differential Input 3. Sample-and-Hold ...
Page 9
PPLICATI FOR ATIO CS CLK Hi-Z B11 B10 OUT t t SMPL CONV CS t suCS CLK Hi-Z D B11 B10 B9 B8 OUT t SMPL Microprocessor Interfaces The LTC1292/LTC1297 ...
Page 10
LTC1292/LTC1297 PPLICATI S I FOR ATIO LTC1292 CS CLK ANALOG INPUTS D OUT Figure 2. Hardware and Software Interface to Motorola MC68HC11 Microcontroller MC68HC11 CODE for LTC1292 Interface LABEL MNEMONIC OPERAND COMMENTS LDAA #$50 CONFIGURATION DATA ...
Page 11
PPLICATI FOR ATIO LTC1297 CS CLK ANALOG INPUTS D OUT Figure 4. Hardware and Software Interface to Motorola MC68HC11 Microcontroller MC68HC11 CODE for LTC1297 Interface LABEL MNEMONIC OPERAND COMMENTS LDAA #$50 CONFIGURATION DATA FOR ...
Page 12
LTC1292/LTC1297 PPLICATI S I FOR ATIO LTC1292 LTC1297 ANALOG INPUTS CS CLK D OUT Figure 5. Hardware and Software Interface to Intel 8051 Processor 8051 CODE LABEL MNEMONIC OPERAND COMMENTS MOV P1,#02h BIT 1 PORT 1 ...
Page 13
PPLICATI S I FOR ATIO OUTPUT PORT 2 SERIAL DATA MPU LTC1292 LTC1292 LTC1297 LTC1297 + – + Figure 6. Several LTC1292/LTC1297s Sharing One 2-Wire Serial Interface use a PC ...
Page 14
LTC1292/LTC1297 PPLICATI S I FOR ATIO Source Resistance The analog inputs of the LTC1292/LTC1297 look like a 100pF capacitor ( series with a 500 resistor (R IN (Figures 10a and 10b). C gets switched ...
Page 15
PPLICATI FOR ATIO CS CLK (+) INPUT MUST SETTLE DURING THIS TIME D OUT (+) INPUT (–) INPUT CS CLK D OUT (+) INPUT (–) INPUT Figure 11c. Setup Time ( With ...
Page 16
LTC1292/LTC1297 PPLICATI S I FOR ATIO CS CLK D OUT (+) INPUT (–) INPUT Figure 12. “+” and “–” Input Settling Windows for the LTC1297 “–” input voltage be free of noise and settle completely during ...
Page 17
PPLICATI S I FOR ATIO RC Input Filtering It is possible to filter the inputs with an RC network as shown in Figure 15. For large values of C capacitive input switching currents are averaged into ...
Page 18
LTC1292/LTC1297 PPLICATI S I FOR ATIO switching currents due to the switched-capacitor con- version technique (see Figure 16). During each bit test of the conversion (every CLK cycle) a capacitive current spike will be generated on ...
Page 19
PPLICATI S I FOR ATIO is reduced. The typical performance characteristics curve of Noise Error vs Reference Voltage shows the LSB contribution of this 200 V of noise. For operation with a 5V reference, the 200 ...
Page 20
LTC1292/LTC1297 PPLICATI FOR ATIO 0 –20 –40 –60 –80 –100 –120 –140 FREQUENCY (kHz) Figure 20a 1kHz 58.8kHz, SNR = 73.0dB –20 ...
Page 21
PPLICATI S I FOR ATIO If V and V are not tied together, then V CC REF be turned on first, then this sequence cannot be REF met, connecting a diode from V ...
Page 22
LTC1292/LTC1297 PPLICATI S I FOR ATIO A “Quick Look” Circuit for the LTC1292 Users can get a quick look at the function and timing of the LTC1292 by using the “Quick Look” circuit in Figure 26. ...
Page 23
... TYPE – 500 C TEMPERATURE RANGE 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 5V/DIV ...
Page 24
... MAX (5.080) (0.127) MAX MIN 0.025 0.220 – 0.310 (0.635) (5.588 – 7.874) RAD TYP 0.125 3.175 MIN 0.400* (10.160) MAX 0.255 0.015* (6.477 0.381 1098 12927fb LT/CPI 0202 1.5K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 J8 1298 ...