LTC2411/LTC2411-1 TIMING CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperaturerange, otherwise specifications are at TA = 25°C. (Note 3)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS fEOSC External Oscillator Frequency Range l 2.56 500 kHz tHEO External Oscillator High Period l 0.25 390 µs tLEO External Oscillator Low Period l 0.25 390 µs tCONV Conversion Time FO = 0V (LTC2411) l 130.86 133.53 136.20 ms FO = VCC (LTC2411) l 157.03 160.23 163.44 ms FO = 0V (LTC2411-1) l 143.78 146.71 149.64 ms External Oscillator (Note 11) l 20510/fEOSC (in kHz) ms f ISCK Internal SCK Frequency Internal Oscillator (LTC2411) (Note 10) 19.2 kHz Internal Oscillator (LTC2411-1) (Note 10) 17.5 kHz External Oscillator (Notes 10, 11) fEOSC/8 kHz DISCK Internal SCK Duty Cycle (Note 10) l 45 55 % fESCK External SCK Frequency Range (Note 9) l 2000 kHz tLESCK External SCK Low Period (Note 9) l 250 ns tHESCK External SCK High Period (Note 9) l 250 ns tDOUT_ISCK Internal SCK 32-Bit Data Output Time Internal Oscillator (LTC2411) (Notes 10, 12) l 1.64 1.67 1.70 ms Internal Oscillator (LTC2411-1) (Notes 10, 12) l 1.80 1.83 1.86 ms External Oscillator (Notes 10, 11) l 256/fEOSC (in kHz) ms tDOUT_ESCK External SCK 32-Bit Data Output Time (Note 9) l 32/fESCK (in kHz) ms t1 CS ↓ to SDO Low Z l 0 200 ns t2 CS ↑ to SDO High Z l 0 200 ns t3 CS ↓ to SCK ↓ (Note 10) l 0 200 ns t4 CS ↓ to SCK ↑ (Note 9) l 50 ns tKQMAX SCK ↓ to SDO Valid l 220 ns tKQMIN SDO Hold After SCK ↓ (Note 5) l 15 ns t5 SCK Set-Up Before CS ↓ l 50 ns t6 SCK Hold After CS ↓ l 50 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 8: FO = VCC (internal oscillator) or fEOSC = 128000Hz ±2% (external may cause permanent damage to the device. Exposure to any Absolute oscillator). Maximum Rating condition for extended periods may affect device Note 9: The converter is in external SCK mode of operation such that the reliability and lifetime. SCK pin is used as digital input. The frequency of the clock signal driving Note 2: All voltage values are with respect to GND. SCK during the data output is fESCK and is expressed in kHz. Note 3: VCC = 2.7 to 5.5V unless otherwise specified. Note 10: The converter is in internal SCK mode of operation such that the VREF = REF+ – REF–, VREFCM = (REF+ + REF–)/2; SCK pin is used as digital output. In this mode of operation the SCK pin VIN = IN+ – IN–, VINCM = (IN+ + IN–)/2. has a total equivalent load capacitance CLOAD = 20pF. Note 4: FO pin tied to GND or to VCC or to external conversion clock source Note 11: The external oscillator is connected to the FO pin. The external with fEOSC = 153600Hz unless otherwise specified. oscillator frequency, fEOSC, is expressed in kHz. Note 5: Guaranteed by design, not subject to test. Note 12: The converter uses the internal oscillator. Note 6: Integral nonlinearity is defined as the deviation of a code from a FO = 0V or FO = VCC. straight line passing through the actual endpoints of the transfer curve. Note 13: The output noise includes the contribution of the internal The deviation is measured from the center of the quantization band. calibration operations. Note 7: FO = 0V (internal oscillator) or fEOSC = 153600Hz ±2% (external Note 14: Guaranteed by design and test correlation. oscillator). Note 15: FO = 0V (internal oscillator) or fEOSC = 139800Hz ±2% (external oscillator). 2411fa For more information www.linear.com/LTC2411 5
