Electronic Components Datasheet Search |
|
WM8200-12 Datasheet(PDF) 9 Page - Wolfson Microelectronics plc |
|
WM8200-12 Datasheet(HTML) 9 Page - Wolfson Microelectronics plc |
9 / 15 page WM8200 Product Preview w PP Rev 1.22 March 2002 9 DC CLAMP The WM8200 incorporates a clamp function for restoring the DC reference level of AC coupled input signals. When the clamp input pin is held high the internal clamp amplifier forces the voltage at AINP to equal the clamp reference voltage, setting the DC level at AINP. The clamp reference voltage comes from the on-chip 10-bit Clamp Level DAC by default, however it can be applied to the AINN pin if the CLPSEL register bit is set high. CLAMP AINN - + AINP 10-Bit DAC SW1 Control Register S/H R IN C IN Vclamp Figure 3 Schematic of Clamp Circuitry Figure 4 shows an example of using the clamp to restore the black level of a composite video input AC coupled to AINN. While the clamp pin is held high, the clamp amplifier forces the voltage at AINN to equal the clamp reference voltage, setting the DC voltage at AINN for the video black level. VIDEO AT AINN CLAMP Line sync Black level Figure 4 Example Waveforms for Line-Clamping to a Video Input Black Level If the CLAMP amplifier is not required it can be disabled for power saving purposes by setting the CLPDIS register bit to high. CLAMP DAC OUTPUT VOLTAGE RANGE AND LIMITS Important: When using the internal clamp DAC in Top/Bottom or Centre Span Mode, the user must ensure that the desired DC clamp level at AIN lies within the voltage range REFB to REFT. This is because the clamp DAC voltage is constrained to lie within this range REFB to REFT. Specifically: VDAC = REFB + (REFT – REFB) x (0.006 +0.988 x (DAC_code)/1024) DAC codes can range from 0 to 1023. Figure 5 shows the clamp DAC output voltage versus the DAC code. |
Similar Part No. - WM8200-12 |
|
Similar Description - WM8200-12 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |