Electronic Components Datasheet Search |
|
PCM1803DBR Datasheet(PDF) 11 Page - Texas Instruments |
|
|
PCM1803DBR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 20 page www.ti.com DEVICE INFORMATION SYSTEM CLOCK SCKI 0.8 V SCKI 2.0 V t(SCKL) t(SCKH) T0005-07 POWER-ON RESET SEQUENCE PCM1803 SLES125 – NOVEMBER 2004 The PCM1803 supports 256 fS, 384 fS, 512 fS, and 768 fS as the system clock, where fS is the audio sampling frequency. The system clock must be supplied on SCKI (pin 15). The PCM1803 has a system clock-detection circuit that automatically senses if the system clock is operating at 256 fS, 384 fS, 512 fS, or 768 fS in slave mode. In master mode, the system clock frequency must be selected by MODE0 (pin 19) and MODE1 (pin 20), and 768 fS is not available. The system clock is divided automatically into 128 fS and 64 fS, and these frequencies are used to operate the digital filter and the delta-sigma modulator. Table 1 shows the relationship of typical sampling frequency and system clock frequency, and Figure 17 shows system clock timing. Table 1. Sampling Frequency and System Clock Frequency SAMPLING FREQUENCY (kHz) SYSTEM CLOCK FREQUENCY (MHz) 256 fS 384 fS 512 fS 768 fS(1) 32 8.1920 12.2880 16.3840 24.5760 44.1 11.2896 16.9344 22.5792 33.8688 48 12.2880 18.4320 24.5760 36.8640 64 16.3840 24.5760 32.7680 49.1520 88.2 22.5792 33.8688 45.1584 – 96 24.5760 36.8640 49.1520 – (1) Slave mode only. SYMBOL PARAMETER MIN MAX UNIT t(SCKH) System clock pulse duration, HIGH 8 ns t(SCKL) System clock pulse duration, LOW 8 ns Figure 17. System Clock Timing The PCM1803 has an internal power-on reset circuit, and initialization (reset) is performed automatically at the time when power-supply voltage (VDD) exceeds 2.2 V (typical). While VDD < 2.2 V (typical) and for 1024 system clock cycles after VDD > 2.2 V (typical), the PCM1803 stays in the reset state and the digital output is forced to zero. The digital output becomes valid when a time period of 4480/fS has elapsed following release from the reset state. Figure 18 illustrates the internal power-on reset timing and the digital output for power-on reset. 11 |
Similar Part No. - PCM1803DBR |
|
Similar Description - PCM1803DBR |
|
|
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 |