Datasheet LTC2485 (Analog Devices) - 5

LTC2485
Ti Ming characTerisTics 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 ● 10 1000 kHz tHEO External Oscillator High Period ● 0.125 100 µs tLEO External Oscillator Low Period ● 0.125 100 µs tCONV_1 Conversion Time for 1x Speed Mode 50Hz Mode ● 157.2 160.3 163.5 ms 60Hz Mode ● 131.0 133.6 136.3 ms Simultaneous 50Hz/60Hz Mode ● 144.1 146.9 149.9 ms External Oscillator (Note 10) ● 41036/fEOSC ms tCONV_2 Conversion Time for 2x Speed Mode 50Hz Mode ● 78.7 80.3 81.9 ms 60Hz Mode ● 65.6 66.9 68.2 ms Simultaneous 50Hz/60Hz Mode ● 72.2 73.6 75.1 ms External Oscillator (Note 10) ● 20556/fEOSC ms
i2 c TiMing characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 15) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fSCL SCL Clock Frequency ● 0 400 kHz tHD(SDA) Hold Time (Repeated) START Condition ● 0.6 µs tLOW LOW Period of the SCL Clock Pin ● 1.3 µs tHIGH HIGH Period of the SCL Clock Pin ● 0.6 µs tSU(STA) Set-Up Time for a Repeated START Condition ● 0.6 µs tHD(DAT) Data Hold Time ● 0 0.9 µs tSU(DAT) Data Set-Up Time ● 100 ns tr Rise Time for Both SDA and SCL Signals (Note 14) ● 20+0.1CB 300 ns tf Fall Time for Both SDA and SCL Signals (Note 14) ● 20+0.1CB 300 ns tSU(STO) Set-Up Time for STOP Condition ● 0.6 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
50Hz mode (internal oscillator) or fEOSC = 256kHz ±2% (external may cause permanent damage to the device. Exposure to any Absolute oscillator). Maximum Rating condition for extended periods may affect device
Note 8:
60Hz mode (internal oscillator) or fEOSC = 307.2kHz ±2% (external reliability and lifetime. oscillator).
Note 2:
All voltage values are with respect to GND.
Note 9:
Simultaneous 50Hz/60Hz mode (internal oscillator) or fEOSC =
Note 3:
VCC = 2.7V to 5.5V unless otherwise specified. 280kHz ±2% (external oscillator). VREF = REF+ – REF–, VREFCM = (REF+ + REF–)/2, FS = 0.5VREF;
Note 10:
The external oscillator is connected to the CA0/f0 pin. The VIN = IN+ – IN–, VINCM = (IN+ + IN–)/2. external oscillator frequency, fEOSC, is expressed in kHz.
Note 4:
Use internal conversion clock or external conversion clock source
Note 11:
The converter uses the internal oscillator. with fEOSC = 307.2kHz unless otherwise specified.
Note 12:
The output noise includes the contribution of the internal
Note 5:
Guaranteed by design, not subject to test. calibration operations.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
Note 13:
Guaranteed by design and test correlation. straight line passing through the actual endpoints of the transfer curve.
Note 14:
CB = capacitance of one bus line in pF. The deviation is measured from the center of the quantization band.
Note 15:
All values refer to VIH(MIN) and VIL(MAX) levels. 2485fd For more information www.linear.com/LTC2485 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics (Normal Speed) Electrical Characteristics (2x Speed) Converter Characteristics Analog Input and Reference I2C Digital Inputs and Digital Outputs Power Requirements Timing Characteristics I2C Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Applications Information Package Description Revision History Typical Application Related Parts