 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CS5394-KS Datasheet(PDF) 11 Page - Cirrus Logic |
|
||||||||||||||||||||||||||||||
CS5394-KS Datasheet(HTML) 11 Page - Cirrus Logic |
|
|
11 / 22 page  CS5394 DS258PP4 11 full scale. Input signals can be AC or DC coupled. The VCOM output is available to filter the internal common mode and it is recommended that this out- put be used to bias the analog input buffer to mini- mize distortion. However, this pin is not intended to supply significant amounts of current and is sus- ceptable to noise coupling into the sampling cir- cuits. Please refer to the CDB5394 for a suggested implementation. The CS5394 samples the analog inputs at 64 × Fs, 3.072 MHz for a 48 kHz sample-rate. The digital filter rejects all noise above 26.6 kHz except for frequencies at 3.072 MHz ±22.1 kHz (and multi- ples of 3.072 MHz). Most audio signals do not have significant energy at 3.072 MHz. Nevertheless, a 39 Ω resistor in series with each analog input and a 3.9 nF capacitor across the inputs will attenuate any noise energy at 3.072 MHz, in addition to provid- ing the optimum source impedance for the modula- tors. The use of capacitors which have a large voltage coefficient must be avoided since these will degrade signal linearity. NPO and COG capacitors are recommended. If active circuitry precedes the ADC, it is recommended that the above RC filter is placed between the active circuitry and the AINR and AINL pins. The above example frequencies scale linearly with sample rate. The on-chip voltage reference is available at VREF for the purpose of decoupling only. The circuit traces attached to this pin must be minimal in length and no load current may be taken from VREF. The recommended decoupling scheme, Figure 1, is a 100 µF electrolytic capacitor and a 0.1 µF ceramic capacitor connected from VREF to AGND. The decoupling capacitors, particularly the 0.1 µF, must be positioned to minimize the electri- cal path from VREF and pin 3, AGND, on the printed circuit board. High Pass Filter The CS5394 includes a high pass filter after the decimator to remove the indeterminate DC offsets introduced by the analog buffer stage and the CS5394 analog modulator. The first-order high pass filter are detailed in the Digital Filter specifi- cations table. The filter response scales linearly with sample rate. Power-up and Calibration Reliable power-up can be accomplished by with- holding the MCLKA/D until the 5 Volt power and configuration pins are stable. It is also recommend- ed that the MCLKA/D be removed if the supplies drop below 4.75 Volt to prevent power glitch relat- ed issues. The delta-sigma modulators settle in a matter of microseconds after the analog section is powered, either through the application of power or by exit- ing the power-down mode. However, the voltage reference will take much longer to reach a final val- ue due to the presence of external capacitance on the VREF pin. A calibration of the tri-level delta-sigma modulator should always be initiated following power-up and after allowing sufficient time for the voltage on the external VREF capacitor to settle. This is required to minimize noise and distortion. Calibration is ac- tivated on a rising edge applied to the CAL pin and requires 4100 LRCK cycles. It is also advised that the CS5394 be calibrated after the device has reached thermal equilibrium to maximize perfor- mance. +3.5 V +2.5 V +1.5 V +3.5 V +2.5 V +1.5 V CS5394 AIN+ AIN- Full Scale Input level= (AIN+) - (AIN-)= 4.0 Vpp Figure 4. Full Scale Input Voltage |
Similar Part No. - CS5394-KS |
|
Similar Description - CS5394-KS |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
