Comtrue Inc. Overview. Block Diagram. CT7301 EVM - B board APN

Transcription

1 CT70 EVM - B board APN Overview The CT-70 serial chip is a high performance single chip digital audio bridge with sample rate converter. It supports the DSD I/F and DoP on S/PDIF input/output channels. The Hardware and Software control mode are available on this chip. The CT70_EVM_B is a general function audio evaluation system. The S/PDIF, IS, DSD/DOP, SRC, DAC and MCU control are combined on this board. This architecture is simple to verify and apply CT70 family chip to any audio system product. The CT70_EVM_B features: digital audio input port S/PDIF Coaxial/Optical input x, p to 8K /bits IS input x, up to 78K bits DSD input x, up to x,.mhz digital audio output port x S/PDIF output port IS output port DSD output analog audio output port AUX analog output with high performance IS DAC Hardware control mode Power latch configuration Input source select Output Frequency select Software control External IC control path 80 MCU on board (optional) Block Diagram Figure. Block diagram Version //0 Copyright 0 comtrue Inc. All rights reserved.

2 PCB Overview Comtrue Inc. CT70 EVM - B board APN IS Input SPDIF Input Output Freq. Select Switch SPDIF Output AUX output IS output DSD Input On Board MCU I/O DSD Output DC Power In Input Source Select Switch IC Control Select Figure. PCB Overview Version //0 Copyright 0 comtrue Inc. All rights reserved.

3 CT70 EVM - B board APN Board I/O connector, Switch and Jumper The audio signal input / output interface: Function Symbol Description DC In J0 +V and Ground S/PDIF In J, J, S/PDDIF input port set to Optical x S/PDIF In J, J, J,J, J7 S/PDDIF input port set to Coaxial x IS In JP7, JP8 IS Audio input x DSD In JP9 DSD audio input S/PDIF Out J9, J0 S/PDIF output port for Optical or Coaxial x IS Out JP0 IS Audio signal output DSD Out J DSD audio output AUX Out J, J Analog AUX R/L out The function control switch for CT70 Function Symbol Description Input Select SW Hardware mode input source select Output Freq. SW Hardware mode output frequency select IC J External IC control to access CT70 s register The reserve interface for MCU test or verification Function Symbol Description ISP J MCU firmware update port UART J MCU RS communication port GPIO J9 MCU GPIO pin test port GPI SW MCU input detect pin x IC J MCU access CT70 s register Version //0 Copyright 0 comtrue Inc. All rights reserved.

4 CT70 EVM - B board APN External connector setting Power Connector: J0 is the system power input port. The +V and GND pin provides power to this EVM board and the suggestion power supply is large than 00mA. Audio signal connector: To apply to different system application and meet fit the mechanical dimension, the Audio input / output port only reserve pad for users. User can select different type Coaxial / Optical connector depends on their requirement.. The default SPDIF input ports are set to optical ports (J, J) and coaxial ports (J, J and J7). User also can adjust the component to change each port function.. There are IS (JP7, JP8) and DSD (JP9) input port on CT70 EVM-B board. There is no special circuit requirement on these paths and the MCLK clock input is unnecessary for CT70 serial chip.. There is an IS audio DAC embedded on this EVM board. This is the suggestion audio output port and the performance is up to SNR 0 db and THD+N 9dB.. The IS and DSD output are reserved for user to connect to another device to process the audio signal. SPDIF input interface: Each SPDIF input port has reserved the pull high and pull low resistors space for this application. See figure for detail. The V+, S and G pad are used for signal connecting. The input signal connect to S pad and into chip S/PDIF input pin via Ω resistor and 0.uF capacitor and pull high/low resistors RH/RL can be used for circuit matching. VDD VDD V+ S RH 0. uf S/PDIF G Ω RL Figure. General circuit for S/PDIF input port It uses S and G pins only when S/PDIF input port is coaxial type connector. The RH resistor is disconnected and RL suggestion value is 7Ω. Figure. Suggest circuit for Coaxial input port Version //0 Copyright 0 comtrue Inc. All rights reserved.

5 CT70 EVM - B board APN All of these three pins are used when S/PDIF input port is Optical type connector. The recommend RH resistor value is 0Ω to enhance the optical response and the RL is disconnected. Figure. Suggest circuit for Optical input port SPDIF_0 and SPDIF_ are set to Optical type connector and the others are set to Coaxial type connector on this board Figure. PCB components setting for Optical and Coaxial Version //0 Copyright 0 comtrue Inc. All rights reserved.

6 SPDIF output interface: CT70 EVM - B board APN The general S/PDIF output circuit is different depends on the connector type. CT70 EVM-B board reserves the necessary resistor and capacitor placement for user to modify their system application as Figure 7. Figure7. General circuit for S/PDIF output port There is a S/PDIF output pin at CT70 serial chip. This EVM board uses this pin to drive coaxial and optical connector at the same time. The default circuit is shows as Figure 8. User also can modify the components to change its function. S/PDIF OUT C R VDD V+ S 0Ω Ω G J9 VDD V+ C R S 0.uF 7Ω R G J0 Figure8. S/PDIF output port Figure9. S/PDIF output -- Left side is used for Optical out and Right side is Coaxial. Version //0 Copyright 0 comtrue Inc. All rights reserved.

7 Function hardware control switch CT70 EVM - B board APN There are two hardware control switch on this EVM board: Input source and Output frequency select on. Each control pin has similar circuit like figure 8. User can use jumper to set the related pin s signal level is high or low to define the selection. The SELx pin is set to high when this pin is shorted; otherwise the level keeps to low. VDD PIN SELx 0KΩ Figure8. Hardware function selection pin circuit Input source select: There are three pins for 8 input port selections. The index of each input source is described at Table. No SEL SEL SEL0 Source Table No SEL SEL SEL0 Source Table SPDIF SPDIF 0 0 SPDIF 0 IS SPDIF 0 IS 0 SPDIF 7 DSD Table. Source select mapping table for hardware control mode The left jumper on PCB is high bit. Short the jumper to set the pin level to high. The setting on Figure 9 is 00 and select input source to SPDIF. Figure9. Hardware Input Source selection Version //0 Copyright 0 comtrue Inc. All rights reserved.

8 Output frequency select: CT70 EVM - B board APN The default SRC mode on this board is set to mode and it can select output frequency from Look Up Table directly. The index and setting of output frequency is described at Table. No Freq Freq Freq Freq0 Output Frequency No Freq Freq Freq Freq0 Output Frequency K K K K K K 0 0 8K 0.8K K 0 0 8K K 0 K (IS port only) 0 0 9K 0 70.K (IS port only) 7 0 8K 78K (IS port only) Table. Output frequency select mapping table for hardware control mode The left jumper on PCB is high bit. Short the jumper to set the pin level to high. The setting on Figure 0 is 00 and select output frequency to 9KHz Figure0. Hardware Output Frequency selection Version //0 Copyright 0 comtrue Inc. All rights reserved.

9 CT70 EVM - B board APN Firmware control MCU: The on system 80 MCU can be used by user to develop their audio system. LED GPO and Jumper level detect GPI pins are reserve for system control. The ISP and UART port also ready for firmware update and communicate with PC command. Advance function: There are two functions are implemented on this EVM board: S/PDIF bit output and DSD/DOP convert to PCM. It use MCU GPI pins to achieve this application. The DSD to PCM function is enabled when P07 is shorted and disabled when it is open. And the SPDIF bit output mode is enabled when P0 is shorted. SPDIF bit DSD/DOP To PCM Figure. Advance function On/Off switch Version //0 Copyright 0 comtrue Inc. All rights reserved.

10 CT70 EVM - B board APN IC control path: The jumper (J) connect MCU s IC pin to CT70 to access register. The default setting of these jumpers is shorted. User can disconnect these jumpers and control CT70 by external controller by IC paths. External IC Access path Figure. IC control path Register Setting: The default control mode of CT70 EVM-B demo board is hardware control mode. There is no SW/FW access requirement. However, some register s default setting value can be changed to enhance the compatibility with the other audio device. Address Bit Value Description 0x0 [7:0] 0x77 SPDIF bandwidth coverage 0x [7:0] 0x88 SPDIF long term jitter coverage 0x [7:0] 0xFF SPDIF cycle to cycle jitter coverage 0xA [] SPDIF signal level detection (VCOM) enhance 0x0 [] Mute out control pin signal inverse 0x0 [] Enable IS bit output 0x0 [] Enable DSD/DOP to PCM convert function Version //0 Copyright 0 comtrue Inc. All rights reserved.

11 Schematic Main CT70: Comtrue Inc. CT70 EVM - B board APN IS0_SCLK IS0_DATA IS0_LRCK IS_SCLK IS_DATA IS_LRCK SPDIF0 SPDIF SPDIF SPDIF SPDIF IS0_SCLK IS0_DATA IS0_LRCK IS_SCLK IS_DATA IS_LRCK AVDD C 0pF IS_SCLK IS_DATA IS_LRCK POR9 Y.89MHz C7 0pF C 0.uF SPDIF0 SPDIF SPDIF SPDIF SPDIF U IS_0_SCLK IS_0_DATA IS_0_LRCK IS SCLK IS DADA 7 IS LRCK 8 _ 9 DVSS 0 _ XIN XOUT CLKOUT/POR9 CT-70 IS_SCLK IS_DATA IS_LRCK SPDIFN 8 SPDIFP 7 SPDIF/SPDIFN_P SPDIF/SPDIFP_N SCL_CT SDA_CT SPDIF SPDIF0 DVSS _ 0 SPDIF_OUT 9 OUT_FREQ0 8 OUT_FREQ 7 OUT_FREQ IS SCLK/DSD_SCK IS DATA/DSD_RIN IS LRCK/DSD_LIN SCL SDA INT _ DVSS DSD_LOUT/POR_IN8 DSD_ROUT/POR_IN7 DSD_SCKO/POR_IN DSD_MODE/POR_IN OUT_FREQ/ASRC_CLK_IN STATUS_OUT/POR_IN0 IS_MCLK_OUT/POR_IN DVSS _ IS_SCLK_OUT/POR_IN 0 IS_DADA_OUT/POR_IN 9 IS_LRCK_OUT/POR_IN 8 AVDD_ 7 INPUT_SEL INPUT_SEL INPUT_SEL0 POR POR POR7 POR8 SPDIF_OUT R SPDIF_OP DSD_MODE DSD_SCLK DSD_RIN DSD_LIN ASRC_FSIN POR0 POR POR POR POR AVDD OUT_FREQ0 OUT_FREQ OUT_FREQ OUT_FREQ INPUT_SEL INPUT_SEL INPUT_SEL0 SPDIF_OP DAC_MUTE_CT IS_MCLK_OUT IS_SCLK_OUT IS_DATA_OUT IS_LRCK_OUT DAC_MUTE_TC IS_MCLK_OUT IS_SCLK_OUT IS_DATA_OUT IS_LRCK_OUT R.7K IRQ AVDD C C C C C C C7 C8 C9 C0 C C uf uf uf uf 0.uF 0.uF 0.uF 0.uF uf uf 0.uF 0.uF de-couple capcitors near by power pins Version //0 Copyright 0 comtrue Inc. All rights reserved.

12 CT70 EVM - B board APN Hardware Control CT70: POR0_C POR_C POR_C POR_C POR_C POR_C POR_C POR7_C POR8_C POR9_C DAC_MUTE_CT IS_MCLK_OUT IS_SCLK_OUT IS_DATA_OUT IS_LRCK_OUT DSD_MODE DSD_SCLK DSD_RIN DSD_LIN POR9 R R 0K R R R R R7 0K 0K R8 R9 R0 Power On Latch POR0:SPDIF Diff/Single 0 (single) POR:DSD/IS (DSD) POR-:X'tal 00 (.00M) POR-:SRC MODE 0 (mode) POR7:IS LJ/Stand. 0 (stand.) POR9-8:IC ID 00 (x0) R 0K R R7 R8 R9 R0 R R R R 0K 0K 0K 0K 0K 0K H/W configuration (POR setting) SW SW 8 JUMPERX.*x JUMPERX.*x 7 INPUT_SEL0 INPUT_SEL INPUT_SEL OUT_FREQ0 OUT_FREQ OUT_FREQ OUT_FREQ R9 R0 R R R R R 0K 0K 0K 0K 0K 0K 0K INPUT CH SELECT H/W Control Switch OUTPUT FREQ SELECT R9 R0.7K.7K SCL_CT SDA_CT SCL SDA SCL SDA JUMPERX J.*x Version //0 Copyright 0 comtrue Inc. All rights reserved.

13 CT70 EVM - B board APN S/PDIF input/output port: J CON R09 R 0 R0 C7 0.uF SPDIF0 SPDIF0 J CON R 0 R R 7 C9 0.uF SPDIF SPDIF J CON R87 R8 0 R88 C 0.uF SPDIF SPDIF J CON R 0 R7 R 7 C8 0.uF SPDIF SPDIF J7 CON R8 0 R0 C0 R9 7 0.uF SPDIF SPDIF S/PDIF inputs C 0 R R J9 CON SPDIF_OP C 0.uF R99 7 RCA:0.uF+7ohm opt_tx:ohm R0 J0 CON S/PDIF outputs L DV 7uH C0 C C C uf 0uF uf 0uF S/PDIF power Version //0 Copyright 0 comtrue Inc. All rights reserved.

14 CT70 EVM - B board APN IS / DSD input/output port: JP7 IS_0_SCLK IS_0_DATA IS_0_LRCK R9 R9 R9 C IS0_SCLK IS0_DATA IS0_LRCK IS0_SCLK IS0_DATA IS0_LRCK HEADER JP8 IS SCLK IS DATA IS LRCK R97 R98 R00 IS_SCLK IS_DATA IS_LRCK IS_SCLK IS_DATA IS_LRCK C8 HEADER JP9 DSD_SCLK DSD_RIN DSD_LIN R0 R0 R0 IS_SCLK IS_DATA IS_LRCK IS_SCLK IS_DATA IS_LRCK C0 HEADER IS/DSD inputs JP0 J IS_MCLK_OUT IS_SCLK_OUT IS_DATA_OUT IS_LRCK_OUT DSD_MODE IS_MCLK_OUT DSD_SCLK DSD_RIN DSD_LIN 7 HEADER HEADER 7.0*xN IS/DSD outputs Version //0 Copyright 0 comtrue Inc. All rights reserved.

15 CT70 EVM - B board APN MCU block: MVDD P0 IR P0 PWR P0 TXD P0 RXD R 0K R 0K U C80F8x_QFN0 SDA SCL MVDD R8 R C 0.uF P0 P00 CCK CD P0 P0. P0. P0. P0. P0./AGND P0.0/VREF GND VDD RST#/CCK CD/P.0 P. P. P. P P0. P0.7 P.0 P. GND P. P0 P07 P P P P P MCU_MUTE R78 R79 R9 70 R70 70 R7 70 R7 70 R7 70 P0 P LED_0 LED_ LED_ LED_ LED_ MCU_MUTE MGND P P P P D LED D LED D LED D LED D LED MVDD MGND MVDD J CCK CD MGND R7 C K MGND MVDD J ISP SW JUMPERX P0 P0 P0 P *x TXD RXD R8 0K R 0K R7 0K R8 0K MGND UART P0 P P P P P P P0 MGND J9 CON0 MGND Version //0 Copyright 0 comtrue Inc. All rights reserved.

16 CT70 EVM - B board APN DAC block: This schematic designs according to TI s reference circuit. It is suitable for PCM/PCM0 serial DAC chip. AV_A C 0uF U AV_D DV J CON J CON 0.uF080 00V C0.nF C.nF C 0.uF/080 C C8 R9 70 R0 70 C C7 0.uF/0.uF/080.uF/080 AV_A 0.uF/ CPVDD CPGND VNEG CAPP CAPM OUTL OUTR AVDD AGND VCOM SDA SCL 8 DGND 7 LDOO XSMT ADR LRCK DIN BCK SCK 0 GPIO MODE MODE ADR GPIO GPIO GPIO C C7 0.uF/080 0.uF/080 R7 0 IS_LRCK_OUT IS_DATA_OUT IS_SCLK_OUT IS_MCLK_OUT R 0 R 0 R 0 DAC_MUTE AV_D R.K R8 0K D7 N8 C9 0.uF DAC_MUTE XSMT: Hi/Unmute Low/Mute SCL SDA SCL SDA R8 SCL_DAC R9 SDA_DAC PCM R7 DAC_MUTE C DAC_MUTE_TC R7 70 DAC_MUTE_Q B Q0 MCU_MUTE R77 MMBT90 E AV AV_D L 7uH AV_A L 7uH C8 uf C uf C uf Version //0 Copyright 0 comtrue Inc. All rights reserved.

17 CT70 EVM - B board APN Power block: DC IN V J0 CON DV L 7uH C 7uF/V U7 VIN A0K-A ADJ/GND VO VO C uf DV L8 7uH C 7uF/V C 0uF U8 VIN A0K-A ADJ/GND VO VO C 0uF AVDD D LED R07 70 C 0uF U9 VIN A0K-A ADJ/GND DV VO VO L9 7uH/ AV C 0uF C uf L 7uH MVDD C9 uf Version //0 Copyright 0 comtrue Inc. All rights reserved.