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| 01/23/01 Errata: CS43L42 Revision G CS43L42 Low Voltage, Stereo DAC with Headphone Amp All references to the CS43L42 mentioned below shall be taken to refer to revision G of the CS43L42 product. The hardware revision code can be found in the 10-character field printed below the part number on each chip. The letter which appears as the fifth character from the right is the revision code (e.g. ANALZG0044 is a Revision G part). * For critical applications, the PopGuard Transient Control may not be sufficient in eliminating extraneous audible artifacts on the headphone outputs during power-up. For these applications, an optional external mute can be used to maintain an absolute minimum of extraneous clicks and pops. Please see Figures 1 and 2 for the headphone mute circuit. For the line outputs, please use the optional mute circuit shown in the CDB43L42 schematic. The headphone outputs clip when the value of VA_HP is below VA. It is recommended that these two supplies be tied together. When the Analog Headphone Attenuation Control registers (02h and 03h) are set for attenuation levels greater than -10 dB, the actual attenuation deviates from the register setting by more than 1 dB. * * Cirrus Logic P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.cirrus.com JAN `01 ER481B1 1 The Motorola MOSFETs shown have been tested to work properly, however, an equivalent device may be used. M G S F1 NH 02 EL T 2 2 0 uF 47 u H F rom C S4 3L 43 Pin 10 (H P_ A) Headphones 1k 16 M G S F1 NH 02 EL T 2 2 0 uF 47 u H F rom C S4 3L 43 Pin 14 (H P_ B) 1k 16 M ute C on trol from uC or D SP 1 00 K See attached timing diagram for /RST and the Mute control. Customer will need to generate the mute control from their DSP or micro-controller. Figure 1. Optional Headphone Mute Circuit for Revision G Headphone output at pin of part ~300 msec. /RST ~900 msec. Mute Control from DSP or uC Figure 2. Timing for Headphone Mute Contacting Cirrus Logic Support: For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at: http://www.cirrus.com/corporate/contacts/sales.cfm or email: proaudio@crystal.com 2 ER481B1 |
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