Os motores de busca de Datasheet de Componentes eletrônicos |
|
AD1855JRSRL Folha de dados(PDF) 8 Page - Analog Devices |
|
AD1855JRSRL Folha de dados(HTML) 8 Page - Analog Devices |
8 / 15 page AD1855 REV. B –8– Serial Control Port The AD1855 serial control port is SPI compatible. SPI (Serial Peripheral Interface) is an industry standard serial port protocol. The write-only serial control port gives the user access to: select input mode, soft power-down control, soft de-emphasis, channel- specific attenuation and mute (both channels at once). The AD1855 serial control port consists of three signals, control clock CCLK (Pin 4), control data CDATA (Pin 5), and control latch CLATCH (Pin 3). The control data input must be valid on the control clock rising edge, and the control clock must make a LO to HI transition when there is valid data. The con- trol latch must make a LO to HI transition after the LSB has been clocked into the AD1855, while the control clock is inac- tive. The timing relation between these signals is shown in Fig- ure 6. The control bits are assigned as in Table III. Digital Timing Min Unit tCCH CCLK HI Pulsewidth 40 (Burst Mode) ns tCD CCLK LO Pulsewidth 40 (Burst Mode) ns tCCP CCLK Period 80 (Burst Mode) ns tCCSU CCLK Setup Time 100 ns tCSU CDATA Setup Time 10 ns tCHD CDATA Hold Time 10 ns tCLL CLATCH LO Pulsewidth 10 ns tCLH CLATCH HI Pulsewidth 130 ns tCLSU CLATCH HI Setup 130 ns Table III. Serial Control Bit Definitions MSB LSB Data 15 Data 14 Data 13 Data 12 Data 11 Data 10 Data 9 Data 8 Data 7 Data 6 Data 5 Data 4 Data 3 Data 2 Data 1 Data 0 IDPM1 IDPM0 Soft Soft 1/Mute 1/Right Volume Volume Volume Volume Volume Volume Volume Volume Volume Volume Input Input Power- De- 0/Normal 0/Left Control Control Control Control Control Control Control Control Control Control Mode1 Mode0 Down Emphasis (Nonmute) Data Data Data Data Data Data Data Data Data Data Select Select tCLL tCLSU tCCH tCSU tCCL tCHD D15 D14 CDATA CCLK CLATCH D0 tCLH tCCSU tCCP Figure 6. Serial Control Port Timing The serial control port is byte oriented. The data is MSB first, and is unsigned. There is one control register for the left chan- nel or the right channel, as distinguished by bit Data 10. For power-up and reset, the default settings are: Data 11 the Mute control bit, reset default state is LO, which is the normal (nonmuted) setting. Data 10 is LO, the Volume 9 through Vol- ume 0 control bits have a reset default value of 11 1111 1111, which is an attenuation of 0.0 dB (i.e., full scale, no attenua- tion). The intent with these reset defaults is to enable AD1855 applications without requiring the use of the serial control port. For those users who do not use the serial control port, it is still possible to mute the AD1855 output by using the MUTE (Pin 23) signal. Note that the serial control port timing is asynchronous to the serial data port timing. Changes made to the attenuator level will be updated on the next edge of the L/ RCLK after the CLATCH write pulse as shown in Figure 7. Mute The AD1855 offers two methods of muting the analog output. By asserting the MUTE (Pin 23) signal HI, both the left and right channel are muted. As an alternative, the user can assert the mute bit in the serial control register (Data 11) HI. The AD1855 has been designed to minimize pops and clicks when muting and unmuting the device. |
Nº de peça semelhante - AD1855JRSRL |
|
Descrição semelhante - AD1855JRSRL |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |