参数资料
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: 37/76页
文件大小: 3497K
代理商: ADS6242IRGZTG4
www.ti.com
fIN Input Frequency MHz
6
5
4
3
2
1
0
1
0
100
200
300
400
500
600
700
Magnitude
dB
G073
Drive Circuit Requirements
SLAS542A – MAY 2007 – REVISED JULY 2007
Figure 83. Analog Input Bandwidth (represented by magnitude of TF_ADC, see Figure 85 )
For optimum performance, the analog inputs must be driven differentially. This improves the common-mode
noise immunity and even order harmonic rejection.
A 5-
resistor in series with each input pin is recommended to damp out ringing caused by the package
parasitics. It is also necessary to present low impedance (< 50
) for the common mode switching currents. For
example, this is achieved by using two resistors from each input terminated to the common mode voltage (VCM).
In addition to the above, the drive circuit may have to be designed to provide a low insertion loss over the
desired frequency range and matched impedance to the source. While doing this, the ADC input impedance has
to be taken into account. Figure 84 shows that the impedance (Zin, looking into the ADC input pins) decreases at
high input frequencies. The smith chart shows that the input impedance is capacitive and can be approximated
by a series R-C upto 500 MHz.
42
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS6245 ADS6244 ADS6243 ADS6242
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