LTC1199CS8 Linear Technology, LTC1199CS8 Datasheet
LTC1199CS8
Specifications of LTC1199CS8
Available stocks
Related parts for LTC1199CS8
LTC1199CS8 Summary of contents
Page 1
... LTC and LT are registered trademarks of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. 10000 2.7V ...
Page 2
... LTC1197CS8 CC 7 LTC1197IS8 CLK LTC1197LCS8 6 D OUT LTC1197LIS8 5 V REF S8 PACKAGE S8 PART MARKING = 150 C, = 175 C/W 1197 JA 1197I ORDER PART NUMBER TOP VIEW LTC1199CS8 LTC1199IS8 7 CLK LTC1199LCS8 6 D OUT LTC1199LIS8 PACKAGE S8 PART MARKING 1199 = 150 C, = 175 C/W JA 1199I The denotes the specifications which apply over ...
Page 3
RECO E DED OPERATI G CO DITIO S the full operating temperature range, otherwise specifications are at T SYMBOL PARAMETER Operation CC t Setup Time CS Before First CLK suCS (See Figures 1, 2) ...
Page 4
LTC1197/LTC1197L LTC1199/LTC1199L VERTER A D ULTIPLEXER CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are 2.7V 2.5V (LTC1197L REF CLK PARAMETER ...
Page 5
U DIGITAL AND DC ELECTRICAL CHARACTERISTICS over the full operating temperature range, otherwise specifications are at T SYMBOL PARAMETER V High Level Input Voltage IH V Low Level Input Voltage IL I High Level Input Current IH I Low Level ...
Page 6
LTC1197/LTC1197L LTC1199/LTC1199L AC CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are 5V 5V defined in Recommended Operating Conditions, unless otherwise noted. CC ...
Page 7
W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Clock Rate 2. 100 1000 10000 FREQUENCY ...
Page 8
LTC1197/LTC1197L LTC1199/LTC1199L W U TYPICAL PERFOR A CE CHARACTERISTICS LTC1197L Change in Linearity vs Supply Voltage 1 2.5V REF 0 3.5MHz CLK 0.6 0.4 0.2 0 – 0.2 – 0.4 – 0.6 – 0.8 – 1.0 ...
Page 9
W U TYPICAL PERFOR A CE CHARACTERISTICS Linearity vs Temperature 0 REF f = 7.2MHz 0.4 CLK 0.3 0.2 0.1 0 –55 – 30 – 120 TEMPERATURE ( ...
Page 10
LTC1197/LTC1197L LTC1199/LTC1199L CTIO S CS (Pin 1): Chip Select Input. A logic low on this input enables the LTC1197/LTC1197L/LTC1199/LTC1199L. Power shutdown is activated when CS is brought high. + IN, CH0 (Pin 2): Analog Input. ...
Page 11
TEST CIRCUITS Load Circuit for dDO r f TEST POINT 3k D OUT 20pF Voltage Waveforms for D Delay Time, t OUT V IH CLK t dDO t hDO D OUT LTC1197/LTC1197L t ...
Page 12
LTC1197/LTC1197L LTC1199/LTC1199L U U APPLICATIO S I FOR ATIO OVERVIEW The LTC1197/LTC1197L/LTC1199/LTC1199L are 10-bit switched-capacitor A/D converters. These sampling ADCs typically draw 5mA of supply current when sampling up to 500kHz (800 A at 2.7V sampling up to 250kHz). Supply ...
Page 13
U U APPLICATIO S I FOR ATIO CS t suCS CLK ODD/ START SIGN D IN SGL/ DUMMY DIFF HI-Z D OUT t SMPL (1.5 CLKs) *AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED ...
Page 14
LTC1197/LTC1197L LTC1199/LTC1199L U U APPLICATIO S I FOR ATIO Dummy Bit The dummy bit is a placeholder that extends the acquisi- tion time of the ADC. This bit can be either high or low and does not affect the conversion ...
Page 15
U U APPLICATIO S I FOR ATIO that convert continuously, the LTC1197/LTC1197L/ LTC1199/LTC1199L will draw their normal operating power continuously. Several things must be taken into account to achieve micropower operation. Shutdown Figures 1 and 2 show the operating sequence ...
Page 16
LTC1197/LTC1197L LTC1199/LTC1199L U U APPLICATIO S I FOR ATIO Mixed Supplies It is possible to have a microprocessor running off a 5V supply and communicate with the ADC operating supplies. The requirement to achieve this is ...
Page 17
U U APPLICATIO S I FOR ATIO CS CLK OUT “+” INPUT “–” INPUT Figure 5. LTC1199/LTC1199L “+” and “–” Input Settling Windows ANALOG INPUTS Because of the capacitive redistribution A/D conversion techniques used, the analog inputs ...
Page 18
LTC1197/LTC1197L LTC1199/LTC1199L U U APPLICATIO S I FOR ATIO conversion result. However critical that the “–” input voltage settles completely during the first CLK cycle of the conversion time and be free of noise. Minimizing R and C2 ...
Page 19
U U APPLICATIO S I FOR ATIO The effective resolution of the LTC1197/LTC1197L can be increased by reducing the input span of the converter. The LTC1197/LTC1197L exhibits good linearity and gain over a wide range of reference voltages (see typical ...
Page 20
LTC1197/LTC1197L LTC1199/LTC1199L U U APPLICATIO S I FOR ATIO Signal-to-Noise Ratio The signal-to-noise ratio (SNR) is the ratio between the RMS amplitude of the fundamental input frequency to the RMS amplitude of all other frequency components at the A/D output. ...
Page 21
U TYPICAL APPLICATIO S MICROPROCESSOR INTERFACES The LTC1197/LTC1197L/LTC1199/LTC1199L can inter- face directly (without external hardware to most popular microprocessor (MPU) synchronous serial formats (see Table 1 MPU without a dedicated serial port is used, then three or four ...
Page 22
LTC1197/LTC1197L LTC1199/LTC1199L U TYPICAL APPLICATIO S START BIT MPU TRANSMIT SGL/ 1 WORD DIFF CS START SGL DIFF CLK D OUT MPU RECEIVED ? ? WORD Hardware and Software Interface to Motorola MC68HC05C4 CS CLK ANALOG LTC1199 INPUTS ...
Page 23
U TYPICAL APPLICATIO S Interfacing to the Parallel Port of the Intel 8051 Family The Intel 8051 has been chosen to demonstrate the interface between the LTC1199 and parallel port micro- processors. Normally, the CS, CLK and D be generated ...
Page 24
LTC1197/LTC1197L LTC1199/LTC1199L U TYPICAL APPLICATIO S A “Quick Look” Circuit for the LTC1197 Users can get a quick look at the function and timing of the LTC1197 by using the following simple circuit (Figure 11 tied to V ...
Page 25
U TYPICAL APPLICATIO S Resistive Touchscreen Interface Figure 13 shows the LTC1199 in a 4-wire resistive touch- screen application. Transistor pairs Q1-Q3, Q2-Q4 apply 5V and ground to the X axis and Y axis, respectively. The LTC1199, with its 2-channel ...
Page 26
LTC1197/LTC1197L LTC1199/LTC1199L U TYPICAL APPLICATIO S Battery Current Monitor The LTC1197L/LTC1199L are ideal for 3V systems. Fig- ure 14 shows a 2. battery current monitor that draws only from the battery it monitors, sampling ...
Page 27
... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...
Page 28
... Unipolar Operation, 5V/3V COMMENTS 0.3% Max, 20ppm/ C Typ Max 0.05% Max, 5ppm/ C Max 0.05% Max, 5ppm/ C Max, SO Package 0.075% Max, 10ppm/ C Max, 130 A Max, SO Package 0.05% Max, 25ppm/ C Max Max, MSOP Package . 11979fa LT/LCG 0301 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 ...