參數(shù)資料
型號(hào)： ADC12062CIVF
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： ADC
英文描述： 12-Bit, 1 MHz, 75 mW A/D Converter
中文描述： 2-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 355K
代理商： ADC12062CIVF
Applications Information
(Continued)
TL/H/11490–18
FIGURE 8. Buffering the Input with an LM6361 High Speed Op Amp
Another benefit of using a high speed buffer is improved
THD performance when using the multiplexer of the
ADC12062. The MUX on-resistance is somewhat non-linear
over input voltage, causing the RC time constant formed by
C
IN
, R
MUX
, and R
SW
to vary depending on the input voltage.
This results in increasing THD with increasing frequency.
Inserting the buffer between the MUX OUT and the ADC IN
terminals as shown in Figure 8 will eliminate the loading on
R
MUX
, significantly reducing the THD of the multiplexed sys-
tem.
Correct converter operation will be obtained for input volt-
ages greater than AGND
b
50 mV and less than AV
CC
a
50 mV. Avoid driving the signal source more than 300 mV
higher than AV
CC
, or more than 300 mV below AGND. If an
analog input pin is forced beyond these voltages, the cur-
rent flowing through that pin should be limited to 25 mA or
less to avoid permanent damage to the IC. The sum of all
the overdrive currents into all pins must be less than 50 mA.
When the input signal is expected to extend more than
300 mV beyond the power supply limits for any reason (un-
known/uncontrollable input voltage range, power-on tran-
sients, fault conditions, etc.) some form of input protection,
such as that shown in Figure 9, should be used.
TL/H/11490–19
FIGURE 9. Input Protection
13
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