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ADC12QS065 Datasheet(PDF) 11 Page - Texas Instruments

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Part # ADC12QS065
Description  Quad 12-Bit 65 MSPS A/D Converter with LVDS Serialized Outputs
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADC12QS065 Datasheet(HTML) 11 Page - Texas Instruments

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VD+
VD-
VOS
GND
VOD = | VD+ - VD- |
VOD
ADC12QS065
www.ti.com
SNOSAD6H – JULY 2005 – REVISED MARCH 2007
Specification Definitions
APERTURE DELAY is the time after the rising edge of the clock to when the input signal is acquired or held for
conversion.
APERTURE JITTER (APERTURE UNCERTAINTY) is the variation in aperture delay from sample to sample.
Aperture jitter manifests itself as noise in the output.
CLOCK DUTY CYCLE is the ratio of the time during one cycle that a repetitive digital waveform is high to the
total time of one period. The specification here refers to the ADC clock input signal.
COMMON MODE VOLTAGE (VCM) is the common d.c. voltage applied to both input terminals of the ADC.
CONVERSION LATENCY is the number of clock cycles between initiation of conversion and when that data is
presented to the output driver stage. Data for any given sample is available at the output pins the Pipeline Delay
plus the Output Delay after the sample is taken. New data is available at every clock cycle, but the data lags the
conversion by the pipeline delay.
CROSSTALK is coupling of energy from one channel into the other channel.
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1
LSB.
EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE BITS) is another method of specifying Signal-to-Noise
and Distortion or SINAD. ENOB is defined as (SINAD - 1.76) / 6.02 and says that the converter is equivalent to a
perfect ADC of this (ENOB) number of bits.
FULL POWER BANDWIDTH is a measure of the frequency at which the reconstructed output fundamental
drops 3 dB below its low frequency value for a full scale input.
GAIN ERROR is the deviation from the ideal slope of the transfer function. It can be calculated as:
Gain Error = Positive Full Scale Error
− Negative Full Scale Error
(1)
Gain Error can also be separated into Positive Gain Error and Negative Gain Error, which are:
PGE = Positive Full Scale Error
− Offset Error
(2)
NGE = Offset Error
− Negative Full Scale Error
(3)
GAIN ERROR MATCHING is the difference in gain errors between the two converters divided by the average
gain of the converters.
INTEGRAL NON LINEARITY (INL) is a measure of the deviation of each individual code from a line drawn from
negative full scale (½ LSB below the first code transition) through positive full scale (½ LSB above the last code
transition). The deviation of any given code from this straight line is measured from the center of that code value.
INTERMODULATION DISTORTION (IMD) is the creation of additional spectral components as a result of two
sinusoidal frequencies being applied to the ADC input at the same time. It is defined as the ratio of the power in
the intermodulation products to the total power in the original frequencies. IMD is usually expressed in dBFS.
LSB (LEAST SIGNIFICANT BIT) is the bit that has the smallest value or weight of all bits. This value is VREF/2
n,
where “n” is the ADC resolution in bits, which is 12 in the case of the ADC12QS065.
LVDS Differential Output Voltage (VOD) is the absolute value of the difference between the differential output
pair voltages (VD+ and VD-), each measured with respect to ground.
(4)
LVDS Output Offset Voltage (VOS) is the midpoint between the differential output pair voltages.
MISSING CODES are those output codes that will never appear at the ADC outputs. The ADC12QS065 is
guaranteed not to have any missing codes.
Copyright © 2005–2007, Texas Instruments Incorporated
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