ADS6142-HT datasheet(45/49 Pages) TI1

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ADS6142-HT

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SLWS234

– DECEMBER 2011

DEFINITION OF SPECIFICATIONS

Analog Bandwidth

The analog input frequency at which the power of the fundamental is reduced by 3 dB with respect to the low

frequency value.

Aperture Delay

The delay in time between the rising edge of the input sampling clock and the actual time at which the sampling

occurs.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Clock Pulse Width/Duty Cycle

The duty cycle of a clock signal is the ratio of the time the clock signal remains at a logic high (clock pulse width)

to the period of the clock signal. Duty cycle is typically expressed as a percentage. A perfect differential

sine-wave clock results in a 50% duty cycle.

Maximum Conversion Rate

The maximum sampling rate at which certified operation is given. All parametric testing is performed at this

sampling rate unless otherwise noted.

Minimum Conversion Rate

The minimum sampling rate at which the ADC functions.

Differential Nonlinearity (DNL)

An ideal ADC exhibits code transitions at analog input values spaced exactly 1 LSB apart. The DNL is the

deviation of any single step from this ideal value, measured in units of LSBs.

Integral Nonlinearity (INL)

The INL is the deviation of the ADC

’s transfer function from a best fit line determined by a least squares curve fit

of that transfer function, measured in units of LSBs.

Gain Error

The gain error is the deviation of the ADC

’s actual input full-scale range from its ideal value. The gain error is

given as a percentage of the ideal input full-scale range.

Offset Error

The offset error is the difference, given in number of LSBs, between the ADC

’s actual average idle channel

output code and the ideal average idle channel output code. This quantity is often mapped into mV.

Temperature Drift

The temperature drift coefficient (with respect to gain error and offset error) specifies the change per degree

Celsius of the parameter from TMIN to TMAX. It is calculated by dividing the maximum deviation of the parameter

across the TMIN to TMAX range by the difference TMAX–TMIN.

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