SBAS520C February 2011 – June 2017 ADS4122 , ADS4125 , ADS4142 , ADS4145
PRODUCTION DATA.
This delay is different across channels. The maximum variation is specified as aperture delay variation (channel-to-channel).
Duty cycle is typically expressed as a percentage. A perfect differential sine-wave clock results in a 50% duty cycle.
All parametric testing is performed at this sampling rate unless otherwise noted.
An ideal ADC exhibits code transitions at analog input values spaced exactly 1 LSB apart.
The gain error is given as a percentage of the ideal input full-scale range. Gain error has two components: error as a result of reference inaccuracy and error as a result of the channel. Both errors are specified independently as EGREF and EGCHAN.
To a first-order approximation, the total gain error is ETOTAL ~ EGREF + EGCHAN.
For example, if ETOTAL = ±0.5%, the full-scale input varies from (1 – 0.5/100) × FSideal to (1 + 0.5/100) × FSideal.
This quantity is often mapped into millivolts.
It is calculated by dividing the maximum deviation of the parameter across the TMIN to TMAX range by the difference TMAX – TMIN.
SNR 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 full-scale range.
SINAD 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 full-scale range.
THD is typically given in units of dBc (dB to carrier).
SFDR is typically given in units of dBc (dB to carrier).
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 full-scale range.
The dc PSRR is typically given in units of mV/V.
If ΔVSUP is the change in supply voltage and ΔVOUT is the resultant change of the ADC output code (referred to the input), then:
This is tested by separately applying a sine wave signal with 6-dB positive and negative overload. The deviation of the first few samples after the overload (from the expected values) is noted.
If ΔVCM_IN is the change in the common-mode voltage of the input pins and ΔVOUT is the resulting change of the ADC output code (referred to the input), then:
It is usually measured by applying a full-scale signal in the adjacent channel. Crosstalk 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.
For Related documentation, see the following:
The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to order now.
PARTS | PRODUCT FOLDER | ORDER NOW | TECHNICAL DOCUMENTS | TOOLS & SOFTWARE | SUPPORT & COMMUNITY |
---|---|---|---|---|---|
ADS4122 | Click here | Click here | Click here | Click here | Click here |
ADS4125 | Click here | Click here | Click here | Click here | Click here |
ADS4142 | Click here | Click here | Click here | Click here | Click here |
ADS4145 | Click here | Click here | Click here | Click here | Click here |
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.