Cirrus-logic CS3308 Manuel d'utilisateur

Copyright © Cirrus Logic, Inc. 2006(All Rights Reserved)http://www.cirrus.com8-Channel Analog Volume ControlFeatures Complete Analog Volume Control–

10 DS702F1CS3308CONTROL PORT SWITCHING CHARACTERISTICS - I²C FORMAT(Inputs: Logic 0 = DGND, Logic 1 = VD, CL=20pF)7. Data must be held for sufficient

DS702F1 11CS3308CONTROL PORT SWITCHING CHARACTERISTICS - SPI™ FORMAT(Inputs: Logic 0 = DGND, Logic 1 = VD, CL=20pF)8. Data must be held for sufficient

12 DS702F1CS33083. TYPICAL CONNECTION DIAGRAM241403130212011REFI1REFI2REFI3REFI4REFI5REFI6REFI7REFI84843383328131813REFO1REFO2REFO3REFO4REFO5REFO6REFO

DS702F1 13CS33084. DETAILED BLOCK DIAGRAMControl Registers8ENOut36574SDA/MOSISCL/CLLKRESETMUTEAD0/CSOUT1+_1470 ~ -96 dB0 ~ +22 dB2RINROUTIN1REFI1Zero

14 DS702F1CS33085. APPLICATIONS5.1 General DescriptionThe CS3308 is an 8-channel digitally controlled analog volume control designed for audio systems

DS702F1 15CS33085.2.2 Analog OutputsThe analog outputs are capable of driving 2kΩ loads to within 1.35 V of the analog supply rails and areshort-circu

16 DS702F1CS33085.3.1 Recommended Power-Up Sequence1. Hold RESET low until the power supplies are stable. In this state, the control port is reset to

DS702F1 17CS33085.4 Volume & Muting Control ArchitectureThe CS3308’s volume and muting control architecture provides the ability to control each c

18 DS702F1CS3308Combining the multiple group addressing capabilities of the CS3308 (as detailed in section 5.8.2 onpage 24) with the internal master c

DS702F1 19CS33085.5 Volume ControlsThe CS3308 provides comprehensive volume control functionality, allowing each channel’s volume to bechanged on an i

2 DS702F1CS3308TABLE OF CONTENTS1. PIN DESCRIPTIONS ...

20 DS702F1CS3308Table 1 shows example volume settings using individual and master volume controls.Refer to Figure 6 on page 18 for a graphical represe

DS702F1 21CS33085.6 Muting ControlsThe CS3308 provides flexible muting capabilities to complement its comprehensive volume control abilities.Each chan

22 DS702F1CS33085.7 Zero-Crossing DetectionThe CS3308 incorporates comprehensive zero-crossing detection features to provide for noise-free leveltrans

DS702F1 23CS33085.8 System Serial Control ConfigurationThe CS3308 includes a comprehensive serial control port which supports both SPI and I²C modes o

24 DS702F1CS33085.8.2 Serial Control within a Multiple-CS3308 SystemThe CS3308 allows both independent and simultaneous control of up to 128 devices o

DS702F1 25CS3308input of device N+1 may be repeated for up to 128 devices per single CS signal. If more than 128 devicesare required in a system, sepa

26 DS702F1CS3308Once this configuration process is complete, every device may be independently controlled with a standardSPI communication cycle using

DS702F1 27CS33085.9 I²C/SPI Serial Control FormatsThe control port is used to access the internal registers of the CS3308. The control port has 2 mode

28 DS702F1CS3308Since the read operation cannot set the MAP, an aborted write operation is used as a preamble. As shownin Figure 13, the write operati

DS702F1 29CS33086. CS3308 REGISTER QUICK REFERENCEThis table shows the register names and their associated default values.Addr Function 7 6 5 4 3 2 1

DS702F1 3CS33087.4.2 MUTE Input Polarity (Bit 4) ... 337

30 DS702F1CS330810h Master 1 MaskM1_Ch8M M1_Ch7M M1_Ch6M M1_Ch5M M1_Ch4M M1_Ch3M M1_Ch2M M1_Ch1Mpage 36 111 1 111111h Master 1 Vol-umeM1_Vol7 M1_Vol6

DS702F1 31CS33087. CS3308 REGISTER DESCRIPTIONSNotes:1. When addressing the CS3308 with the Individual Chip Address, all registers are read/write in I

32 DS702F1CS33087.2 ¼ dB Control - Address 09h7.2.1 ¼ dB Control (Bit 0 - 7)Default = 0Function:When set, ¼ dB of gain will be added to each bit’s res

DS702F1 33CS33087.3 Mute Control - Address 0Ah7.3.1 Mute Channel X (Bit 0 - 7)Default = 0Function:Each bit controls the individual mute state of its r

34 DS702F1CS33087.4.3 Channel B = Channel A (Bit 0 - 3)Default = 0Function:When this bit is set, Channel A and Channel B volume levels and muting cond

DS702F1 35CS33087.5.2 Zero-Crossing Mode (Bits 1:0)Default = 01Function:These bits control the Zero-Crossing detection mode as shown in Table 9. Refer

36 DS702F1CS33087.8 Freeze Control - Address 0Fh7.8.1 Freeze (Bit 7)Default = 0Function:When the Freeze bit is set, the Freeze function allows modific

DS702F1 37CS33087.11 Master 1 Control - Address 12h7.11.1 Master 1 Mute (Bit 1)Default = 0Function:This bit controls the Master 1 mute state. When set

38 DS702F1CS3308In the equation above, “Desired Volume Setting in dB” is determined by rounding the desired ¼ dBresolution volume setting down to ½ dB

DS702F1 39CS3308as dictated by the ZCMode[1:0] and TimeOut[2:0] bits in the Device Config 2 register (see “DeviceConfiguration 2 - Address 0Ch” on pag

4 DS702F1CS3308LIST OF FIGURESFigure 1.Control Port Timing - I²C Format...

40 DS702F1CS33087.18 Group 2 Chip Address 19h7.18.1 Group 2 Chip Address (Bits 7:1)SPI Mode Default = 1000000bI²C Mode Default = See Table 4 on page 2

DS702F1 41CS33087.20 Individual Chip Address 1Bh7.20.1 Individual Chip Address (Bits 7:1)SPI Mode Default = 1000000bI²C Mode Default = See Table 4 on

42 DS702F1CS33088. PARAMETER DEFINITIONSDynamic RangeFull-scale (RMS) signal to broadband noise ratio. The broadband noise is measured over the specif

DS702F1 43CS33089. PACKAGE DIMENSIONS10.THERMAL CHARACTERISTICS AND SPECIFICATIONS 1. θJA is specified according to JEDEC specifications for multi-la

44 DS702F1CS330811.ORDERING INFORMATION12.REVISION HISTORYProduct Description Package Pb-Free Grade Temp Range Container Order #CS33088-ChannelAnalog

DS702F1 5CS33081. PIN DESCRIPTIONSPin Name # Pin DescriptionIN1IN2IN3IN4IN5IN6IN7IN8142393229221912Analog Inputs (Input) - The full-scale level is spe

6 DS702F1CS3308OUT1OUT2OUT3OUT4OUT5OUT6OUT7OUT84744373427241714Analog Outputs (Output) - The full-scale output level is specified in the Analog Charac

DS702F1 7CS33082. CHARACTERISTICS AND SPECIFICATIONSAll Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditi

8 DS702F1CS3308ANALOG CHARACTERISTICS(Test conditions (unless otherwise specified): RS=0; RL=2kΩ; CL= 20 pF; 10 Hz to 20 kHz Measurement Band-width)3.

DS702F1 9CS3308DIGITAL INTERFACE CHARACTERISTICSMUTE SWITCHING CHARACTERISTICS(Inputs: Logic 0 = DGND, Logic 1 = VD)6. The MUTE active state (low/high