Datasheet LTC2495 (Analog Devices) - 5

LTC2495
Digital 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
fEOSC External Oscillator Frequency Range (Note 16) l 10 1000 kHz tHEO External Oscillator High Period l 0.125 100 µs tLEO External Oscillator Low Period l 0.125 100 µs 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 50Hz/60Hz Mode l 144.1 146.9 149.9 ms External Oscillator (Note 10) 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 50Hz/60Hz Mode l 72.2 73.6 75.1 ms External Oscillator (Note 10) 20556/fEOSC (in kHz) ms
i2c tiMing characteristics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3, 15) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fSCL SCL Clock Frequency l 0 400 kHz tHD(SDA) Hold Time (Repeated) START Condition l 0.6 µs tLOW LOW Period of the SCL Pin l 1.3 µs tHIGH HIGH Period of the SCL Pin l 0.6 µs tSU(STA) Set-Up Time for a Repeated START Condition l 0.6 µs tHD(DAT) Data Hold Time l 0 0.9 µs tSU(DAT) Data Set-Up Time l 100 ns tr Rise Time for SDA Signals (Note 14) l 20 + 0.1CB 300 ns tf Fall Time for SDA Signals (Note 14) l 20 + 0.1CB 300 ns tSU(STO) Set-Up Time for STOP Condition l 0.6 µs tBUF Bus Free Time Between a Second START Condition l 1.3 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
50Hz mode (internal oscillator) or fEOSC = 256kHz ±2% (external oscillator). may cause permanent damage to the device. Exposure to any Absolute
Note 8:
60Hz mode (internal oscillator) or fEOSC = 307.2kHz ±2% (external oscillator). Maximum Rating condition for extended periods may affect device
Note 9:
Simultaneous 50Hz/60Hz mode (internal oscillator) or f reliability and lifetime. EOSC = 280kHz ±2% (external oscillator).
Note 2:
All voltage values are with respect to GND.
Note 10:
The external oscillator is connected to the fO pin. The external
Note 3:
Unless otherwise specified: VCC = 2.7V to 5.5V oscillator frequency, fEOSC, is expressed in kHz. VREFCM = VREF/2, FS = 0.5VREF/Gain
Note 11:
The converter uses its internal oscillator. VIN = IN+ – IN–, VIN(CM) = (IN+ – IN–)/2,
Note 12:
The output noise includes the contribution of the internal where IN+ and IN– are the selected input channels. calibration operations.
Note 4:
Use internal conversion clock or external conversion clock source
Note 13:
Guaranteed by design and test correlation. with fEOSC = 307.2kHz unless otherwise specified.
Note 14:
CB = capacitance of one bus line in pF (10pF ≤ CB ≤ 400pF).
Note 5:
Guaranteed by design, not subject to test.
Note 15:
All values refer to VIH(MIN) and VIL(MAX) levels.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
Note 16:
Refer to Applications Information section for Performance vs straight line passing through the actual endpoints of the transfer curve. Data Rate graphs. The deviation is measured from the center of the quantization band. 2495fe For more information www.linear.com/LTC2495 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics (Normal Speed) Electrical Characteristics (2x Speed) Converter Characteristics Analog Input and Reference I2C Inputs And Digital Outputs Power Requirements Digital Inputs And Digital Outputs I2C Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Applications Information Package Description Revision History Related Parts