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| 型号： | ADS6242IRGZTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC48 |
| 封装： | 7 X 7 MM, GREEN, PLASTIC, QFN-48 |
| 文件页数： | 62/76页 |
| 文件大小： | 3497K |
| 代理商： | ADS6242IRGZTG4 |
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PSRR + 20Log10 D
Vout
DVsup
, expressed in dBc
(7)
CMRR + 20Log10 D
Vout
DVcm_in
, expressed in dBc
(8)
SLAS542A – MAY 2007 – REVISED JULY 2007
Spurious-Free Dynamic Range (SFDR) – The ratio of the power of the fundamental to the highest other
spectral component (either spur or harmonic). SFDR is typically given in units of dBc (dB to carrier).
Two-Tone Intermodulation Distortion – IMD3 is the ratio of the power of the fundamental (at frequencies f1
and f2) to the power of the worst spectral component at either frequency 2f1–f2 or 2f2–f1. IMD3 is either given in
units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to
full scale) when the power of the fundamental is extrapolated to the converter’s full-scale range.
DC Power Supply Rejection Ratio (DC PSRR) – The DC PSSR is the ratio of the change in offset error to a
change in analog supply voltage. The DC PSRR is typically given in units of mV/V.
AC Power Supply Rejection Ratio (AC PSRR) – AC PSRR is the measure of rejection of variations in the
supply voltage by the ADC. If
ΔVsup is the change in supply voltage and ΔVout is the resultant change of the
ADC output code (referred to the input), then
Voltage Overload Recovery – The number of clock cycles taken to recover to less than 1% error after an
overload on the analog inputs. This is tested by separately applying a sine wave signal with 6dB positive and
negative overload. The deviation of the first few samples after the overload (from their expected values) is noted.
Common Mode Rejection Ratio (CMRR) – CMRR is the measure of rejection of variations in the analog input
common-mode by the ADC. If
ΔVcm_in is the change in the common-mode voltage of the input pins and ΔVout
is the resultant change of the ADC output code (referred to the input), then
Cross-Talk (only for multi-channel ADC)– This is a measure of the internal coupling of a signal from adjacent
channel into the channel of interest. It is specified separately for coupling from the immediate neighbouring
channel (near-channel) and for coupling from channel across the package (far-channel). It is usually measured
by applying a full-scale signal in the adjacent channel. Cross-talk is the ratio of the power of the coupling signal
(as measured at the output of the channel of interest) to the power of the signal applied at the adjacent channel
input. It is typically expressed in dBc.
Copyright 2007, Texas Instruments Incorporated
65
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