Datasheet LTC2492 (Analog Devices) - 5

LTC2492
Digi Tal inpuTs anD DigiTal ouTpuTs The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tCONV_1 Conversion Time for 1x Speed Mode 50Hz Mode l 157.2 160.3 163.5 ms 60Hz Mode l 131 133.6 136.3 ms Simultaneous 50/60Hz Mode l 144.1 146.9 149.9 ms External Oscillator 41036/fEOSC (in kHz) ms tCONV_2 Conversion Time for 2x Speed Mode 50Hz Mode l 78.7 80.3 81.9 ms 60Hz Mode l 65.6 66.9 68.2 ms Simultaneous 50/60Hz Mode l 72.2 73.6 75.1 ms External Oscillator 20556/fEOSC (in kHz) ms fISCK Internal SCK Frequency Internal Oscillator (Notes 10, 17) 38.4 kHz External Oscillator (Notes 10, 11, 15) fEOSC/8 kHz DISCK Internal SCK Duty Cycle (Notes 10, 17) l 45 55 % fESCK External SCK Frequency Range (Notes 10, 11, 15) l 4000 kHz tLESCK External SCK Low Period (Notes 10, 11, 15) l 125 ns tHESCK External SCK High Period (Notes 10, 11, 15) l 125 ns tDOUT_ISCK Internal SCK 32-Bit Data Output Time Internal Oscillator (Notes 10, 17) l 0.81 0.83 0.85 ms External Oscillator (Notes 10, 11, 15) 256/fEOSC (in kHz) ms tDOUT_ESCK External SCK 32-Bit Data Output Time (Notes 10, 11, 15) 32/fESCK (in kHz) ms t1 CS↓ to SDO Low l 0 200 ns t2 CS↑ to SDO Hi-Z l 0 200 ns t3 CS↓ to SCK↓ Internal SCK Mode l 0 200 ns t4 CS↓ to SCK↑ External SCK Mode l 50 ns tKQMAX SCK↓ to SDO Valid l 200 ns tKQMIN SDO Hold After SCK↓ (Note 5) l 15 ns t5 SCK Set Up Before CS↓ l 50 ns t7 SDI Set Up Before SCK↑ (Note 5) l 100 ns t8 SDI Hold After SCK↑ (Note 5) l 100 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings may
Note 9:
Simultaneous 50Hz/60Hz mode (internal oscillator) or cause permanent damage to the device. Exposure to any Absolute Maximum fEOSC = 280kHz ±2% (external oscillator). Rating condition for extended periods may affect device reliability and lifetime.
Note 10:
The SCK can be configured in external SCK mode or internal SCK
Note 2:
All voltage values are with respect to GND. mode. In external SCK mode, the SCK pin is used as a digital input and the
Note 3:
Unless otherwise specified: driving clock is fESCK. In the internal SCK mode, the SCK pin is used as a V digital output and the output clock signal during the data output is f CC = 2.7V to 5.5V ISCK. V
Note 11:
The external oscillator is connected to the f REFCM = VREF/2, FS = 0.5VREF O pin. The external oscillator frequency, f V EOSC, is expressed in kHz. IN = IN+ – IN–, VIN(CM) = (IN+ – IN–)/2, where IN+ and IN– are the selected input channels.
Note 12:
The converter uses its internal oscillator.
Note 4:
Use internal conversion clock or external conversion clock source
Note 13:
The output noise includes the contribution of the internal with f calibration operations. EOSC = 307.2kHz unless other wise specified.
Note 5:
Guaranteed by design, not subject to test.
Note 14:
Guaranteed by design and test correlation.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
Note 15:
The converter is in external SCK mode of operation such that the straight line passing through the actual endpoints of the transfer curve. SCK pin is used as a digital input. The frequency of the clock signal driving The deviation is measured from the center of the quantization band. SCK during the data output is fESCK and is expressed in Hz.
Note 7:
50Hz mode (internal oscillator) or f
Note 16:
Refer to Applications Information section for performance vs EOSC = 256kHz ±2% (external oscillator). data rate graphs.
Note 8:
60Hz mode (internal oscillator) or f
Note 17:
The converter in internal SCK mode of operation such that the EOSC = 307.2kHz ±2% (external oscillator). SCK pin is used as a digital output.
Note 18:
For VCC < 3V, VIH is 2.5V for pin fO. 2492fe For more information www.linear.com/LTC2492 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics (Normal Speed) Pin Configuration Electrical Characteristics (2x Speed) Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Digital Inputs and Digital Outputs Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Timing Diagrams Applications Information Package Description Revision History Typical Application Related Parts