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AFE7222IRGCT Datasheet(PDF) 89 Page - Texas Instruments |
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AFE7222IRGCT Datasheet(HTML) 89 Page - Texas Instruments |
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89 / 106 page  CLKINP 5 kW VCM 5 kW 2 pF 20 W 20 W Lpkg ~ 1 nH Cbond ~ 1 pF Lpkg ~ 1 nH Cbond ~ 1 pF Resr ~100 W Resr ~ CLKINN Differential Clock buffer Ceq Ceq Ceq ~ 1 to 3 pF, equivalent input capacitance of differential clock buffer 100 W 12-Bit SAR ADC AUXADC_A AUXADC_B Serializer SDOUT SCLK SCLK MODE_INPUT<1:0> SHIGH BYPASSZ_BUF Input Buffer AFE7222 AFE7225 www.ti.com SLOS711B – NOVEMBER 2011 – REVISED MARCH 2012 Figure 10-14. Input Clock Equivalent Circuit 10.8 Auxiliary ADC The schematic of the Auxiliary ADC is shown below. Figure 10-15. Auxiliary ADC Schematic The Auxiliary ADC comprises a 12-bit SAR ADC with a high impedance input buffer that is bypassed by default (BYPASSZ_BUF=0). The Auxiliary ADC can select its input from 2 external pins called AUXADC_A and AUXADC_B. This selection is done using the bits MODE_INPUT <1:0>. The conversion is started by setting bit CONV_START to 1, and SCLK is used as the conversion clock. The SAR ADC converts the selected input and the 12-bit output is serialized using the SCLK and given out on the SDOUT pin. After setting CONV_START to 1, the Auxiliary ADC can be configured for either a single conversion, multiple conversions or in continuous conversion mode. With the input buffer bypassed, the input range of the Auxiliary ADC is 0-1.5V when RANGE_AUXADC is set to 0. When the Auxiliary ADC is converting, the SAR ADC draws switching current from the input pin if the input buffer is bypassed. This may not be desirable for applications where the voltage being monitored does not have drive capability. With the input buffer introduced in the path of the input, the AUXADC inputs are high impedance and do not draw current. However, the input voltage range (at the AUXADC pins) is slightly reduced to 0.1-1.5V. With RANGE_AUXADC set to 1, the input range is increased to 0-DVDD18 with the buffer bypassed and 0.1-(DVDD18-0.1)V with the buffer enabled. Copyright © 2011–2012, Texas Instruments Incorporated DIGITAL INTERFACE 89 Submit Documentation Feedback Product Folder Link(s): AFE7222 AFE7225 |
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