Electronic Components Datasheet Search |
|
WM2130CDT Datasheet(PDF) 9 Page - Wolfson Microelectronics plc |
|
WM2130CDT Datasheet(HTML) 9 Page - Wolfson Microelectronics plc |
9 / 20 page Production Data WM2130 WOLFSON MICROELECTRONICS LTD PD Rev 1.2 April 2001 9 ANALOGUE-TO-DIGITAL CONVERTER Regardless of the reference configuration, VQ is digitised against ADC Reference Voltages REFTF and REFBF, full scale values of VQ being given by: 2 REFBF REFTF V QFS − = + and − − = − 2 REFBF REFTF V QFS Attempts to convert VQ voltages outside the range of VQFS- to VQFS+ are signalled to the application by driving the OVR output pin high. If VQ is less than VQFS-, the ADC output code is 0. If VQ is greater than VQFS+, the output code is 1023. SIGNAL CHAIN SUMMARY Combining the above equations and referring back to the input, the positive and negative full-scale voltages at the AIN pin are: 2 REFBF REFTF V V M INFS − + = + and 2 REFBF REFTF V V M INFS − − = − Therefore the input signal span is given by: REFBF REFTF V V INFS INFS − = − − + In order to match the ADC input range to the input signal amplitude, REFTF and REFBF should be set such that: ) ( − + − = − INFS INFS V V REFBF REFTF ADC REFERENCE MODES The WM2130 supports three basic modes of reference generation, selected by the voltage applied to the MODE pin. These are summarised and explained in Table 1. In differential, Centre Span and Top/Bottom modes, the internally generated ADC references are intened solely for WM2130 internal use and REFTF and REFBF must not be used as voltage references for any other device in the application. MODE PIN MODE FUNCTION COMMENTS AGND Full external REFTS REFTF = REFBS REFBF = On-chip reference generator and reference buffer are not used. AVDD/2 Differential 2 REF V AVDD REFTF + = 2 REF V AVDD REFTF − = VREF can be internally or externally generated. REFTS and REFBS are joined together and connected either to the negative end of the input signal (true differential mode) or to the AIN mid-scale voltage (centre-span mode). AVDD Top/Bottom () 2 REFBS REFTS AVDD REFTF − + = () 2 REFBS REFTS AVDD REFBF − − = On-chip reference generator is not used. Reference buffer centers external reference voltages around AVDD/2. Table 1 WM2130 Reference Generation Modes |
Similar Part No. - WM2130CDT |
|
Similar Description - WM2130CDT |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |