LTC2499 datasheet(5/34 Pages) LINER

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LTC2499

2499fc

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fEOSC

External Oscillator Frequency Range

(Note 16)

4000

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

60Hz Mode

Simultaneous 50Hz/60Hz Mode

External Oscillator (Note 10)

157.2

131

144.1

160.3

133.6

146.9

41036/fEOSC (in kHz)

163.5

136.3

149.9

tCONV_2

Conversion Time for 2x Speed Mode

50Hz Mode

60Hz Mode

Simultaneous 50Hz/60Hz Mode

External Oscillator (Note 10)

78.7

65.6

72.2

80.3

66.9

73.6

20556/fEOSC (in kHz)

81.9

68.2

75.1

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

fSCL

SCL Clock Frequency

400

kHz

tHD(SDA)

Hold Time (Repeated) Start Condition

0.6

μs

tLOW

Low Period of the SCL Pin

1.3

μs

tHIGH

High Period of the SCL Pin

0.6

μs

tSU(STA)

Set-Up Time for a Repeated Start Condition

0.6

μs

tHD(DAT)

Data Hold Time

0.9

μs

tSU(DAT)

Data Set-Up Time

100

Rise Time for SDA Signals

(Note 14)

20 + 0.1CB

300

Fall Time for SDA Signals

(Note 14)

20 + 0.1CB

300

tSU(STO)

Set-Up Time for Stop Condition

0.6

μs

tBUF

Bus Free Time Between a Second Start Condition

1.3

μs

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)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All voltage values are with respect to GND.

Note 3: Unless otherwise speciﬁed: VCC = 2.7V to 5.5V

VREFCM = VREF/2, FS = 0.5VREF

VIN = IN+ – IN–, VIN(CM) = (IN+ – IN–)/2,

where IN+ and IN– are the selected input channels.

Note 4: Use internal conversion clock or external conversion clock source

with fEOSC = 307.2kHz unless otherwise speciﬁed.

Note 5: Guaranteed by design, not subject to test.

Note 6: Integral nonlinearity is deﬁned as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 7: 50Hz mode (internal oscillator) or fEOSC = 256kHz ±2% (external

oscillator).

Note 8: 60Hz mode (internal oscillator) or fEOSC = 307.2kHz ±2% (external

oscillator).

Note 9: Simultaneous 50Hz/60Hz mode (internal oscillator) or fEOSC =

280kHz ±2% (external oscillator).

Note 10: The external oscillator is connected to the fO pin. The external

oscillator frequency, fEOSC, is expressed in kHz.

Note 11: The converter uses its internal oscillator.

Note 12: The output noise includes the contribution of the internal

calibration operations.

Note 13: Guaranteed by design and test correlation.

Note 14: CB = capacitance of one bus line in pF (10pF ≤ CB ≤ 400pF).

Note 15: All values refer to VIH(MIN) and VIL(MAX) levels.

Note 16: Refer to Applications Information section for Performance vs

Data Rate graphs.

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