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參數(shù)資料
| 型號： | ADC12662 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 12-Bit, 1.5 MHz, 200 mW A/D Converter with Input Multiplexer and Sample/Hold |
| 中文描述： | 12位，1.5兆赫，200毫瓦的A / D輸入多路復(fù)用器和轉(zhuǎn)換器采樣/保持 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 495K |
| 代理商： | ADC12662 |
Applications Information
(Continued)
LM6361 driving the ADC IN input of an ADC12662. The
100 pF capacitor at the input of the converter absorbs some
of the high frequency transients generated by the S/H
switching, reducing the op amp transient response require-
ments. The 100 pF capacitor should only be used with high
speed op amps that are unconditionally stable driving ca-
pacitive loads.
Another benefit of using a high speed buffer is improved
THD performance when using the multiplexer of the
ADC12662. 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
, significantly reducing the THD of the multiplexed
system.
Correct converter operation will be obtained for input volt-
ages greater than AGND 50 mV and less than AV
+ 50
mV. Avoid driving the signal source more than 300 mV
higher than AV
, or more than 300 mV below AGND. If an
analog input pin is forced beyond these voltages, the current
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
(unknown/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.
01187619
FIGURE 7. Simplified ADC12662 Input Stage
01187620
FIGURE 8. Buffering the Input with an LM6361 High Speed Op Amp
A
www.national.com
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