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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： | 41/76页 |
| 文件大小： | 3497K |
| 代理商： | ADS6242IRGZTG4 |
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www.ti.com
S0165-04
VCM
REFM
REFP
INTREF
EXTREF
4kW
1kW
Internal
Reference
ADS6xxx
Internal Reference
External Reference
Fullscale differential input pp + (Voltage forced on VCM)
1.33
(2)
COARSE GAIN AND PROGRAMMABLE FINE GAIN
SLAS542A – MAY 2007 – REVISED JULY 2007
Figure 88. Reference Section
When the device is in internal reference mode, the REFP and REFM voltages are generated internally.
Common-mode voltage (1.5 V nominal) is output on VCM pin, which can be used to externally bias the analog
input pins.
When the device is in external reference mode, the VCM acts as a reference input pin. The voltage forced on the
VCM pin is buffered and gained by 1.33 internally, generating the REFP and REFM voltages. The differential
input voltage corresponding to full-scale is given by Equation 2.
In this mode, the range of voltage applied on VCM should be 1.45 V to 1.55 V. The 1.5-V common-mode voltage
to bias the input pins has to be generated externally.
ADS624X includes gain settings that can be used to get improved SFDR performance (compared to 0 dB gain
mode). The gain settings are 3.5 dB coarse gain and programmable fine gain from 0 dB to 6 dB. For each gain
setting, the analog input full-scale range scales proportionally, as shown in Table 22.
The coarse gain is a fixed setting of 3.5 dB and is designed to improve SFDR with little degradation in SNR. The
fine gain is programmable in 1 dB steps from 0 to 6 dB. With fine gain also, SFDR improvement is achieved, but
at the expense of SNR (there is about 1dB SNR degradation for every 1dB of fine gain).
46
Copyright 2007, Texas Instruments Incorporated
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