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WM2130IDV Datasheet(PDF) 10 Page - Wolfson Microelectronics plc |
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WM2130IDV Datasheet(HTML) 10 Page - Wolfson Microelectronics plc |
10 / 20 page WM2130 Production Data WOLFSON MICROELECTRONICS LTD PD Rev 1.2 April 2001 10 FULL EXTERNAL REFERENCE MODE (MODE = AGND) When MODE is connected to AGND, the WM2130 operates in full external reference mode. The internal reference buffer is powered down and bypassed, so that the ADC core takes the user- supplied reference voltages at pins REFTS and REFBS (REFTS and REFBS are internally connected to REFTF and REFBF). The mean of REFTF and REFBF must be equal to AVDD/2. Only single-ended input is possible in this mode. REFTS REFBS AIN REFTF REFBF ADC CORE SAMPLE AND HOLD -1/2 +1 -1/2 INTERNAL REFERENCE BUFFER Figure 6 ADC Reference Generation in Full External Mode The full external mode of operation is useful when the application requires more accurate or lower drift reference voltages than the WM2130 can provide, or when devices need to share common reference voltages for best ADC matching. It also offers the possibility of using REFTS and REFBS as sense lines to drive the REFTF and REFBF lines (Kelvin mode) to eliminate any voltage drops from remote references within the system (see Figure 7). In Kelvin configurations, take care when choosing the external op-amps to ensure that they can drive large capacitive loads without oscillating. Although the on-chip reference generator is not used by the WM2130 in full external mode, its output is available on the VREF pin and can be used by other parts of the system. Note that in addition to the internal connections from REFTS to REFTF and REFBS to REFBF, external wire connections must also be made as shown in Figure 8 to minimise resistance (except in Kelvin mode). AVDD/2 AVDD AIN MODE REFSENSE DC SOURCE = AVDD/2 + [(+FS) - (-FS)] * GAIN/2 DC SOURCE = AVDD/2 - [(+FS) - (-FS)] * GAIN/2 REFTF REFBF +FS -FS REFTS REFBS 0.1µF 10µF 0.1µF 0.1µF Figure 7 Full External Reference Mode (Reference Generator Disabled) |
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