STEVAL-CCA025V1 Class G capless headphone amplifier demonstration board based on the TS4621E Data brief Features ■ Power supply range: 2.3 V to 4.8 V ■ 0.6 mA/channel quiescent current ■ 2.1 mA current consumption with 100 µW/channel (10 dB crest factor) ■ 0.006% typical THD+N at 1 kHz ■ 100 dB typical PSRR at 217 Hz ■ Zero pop and click ■ I2C interface for volume control ■ Digital volume control range: -60 dB to +4 dB ■ 100 dB of SNR A-weighted at G = 0 dB ■ Independent right and left channel enable control ■ Integrated high-efficiency buck converter ■ Low standby current: 5 µA max ■ No output coupling capacitors (thanks to the internal negative supply) ■ Thermal shutdown and short-circuit protection ■ RoHS compliant STEVAL-CCA025V1 Description The STEVAL-CCA025V1 demonstration board is designed to aid in the evaluation of the TS4621E audio differential input stereo headphone amplifier. The TS4621E device is soldered on a four-layer PCB. An on-board RS-232 to I2C interface renders the board easy to control from a personal computer through a serial port. The software provided with the board controls all features of the TS4621E, such as gain, mode, mute, standby and register status. You can also use the connectors on the demonstration board to directly control the features through another I2C interface. September 2011 Doc ID 17667 Rev 2 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic diagrams STEVAL-CCA025V1 1 Schematic diagrams Figure 1. Circuit schematics 6CC #N 6CC)# # & 0OWER ! #N 'ND 5 3W 0OSITIVE (P6DD " SUPPLY #N 'ND # & ! )N, " )N, ( ! !6DD # & ,EVEL DETECTOR # N& ,EFTOUTPUT 2 #-3 # # & # & 3$! 3#, 'ND # )N2 $ $ 3#, )# #N # N& .EGATIVE SUPPLY 06SS $ 3$! * 2 6OUT2 $ ,EVEL DETECTOR )N2 #N 'ND # & 6OUT, ! #N 2IGHTINPUT 'ND 'ND ,EFTINPUT 'ND (06DD , 'ND 2IGHTOUTPUT 'ND 06SS # # # " # 'ND !'ND " 43%?&# 'ND # & 'ND # & 43%MAIN APPLICATION #N 3#, #N 3$! 3#, 3$! 6CC 6CC)# #N 2 + 2 + 6CC)# 2 5! 1 1 2 +0 * '.$ $42 48$ 243 $32 $" 1 'ND 'ND 'ND '.$ 2 + 'ND $ . 5" +0 2 K '.$ 2 + $ . 'ND 5# +0 '.$ 'ND 23TO)#CONVERTER !-6 2/4 Doc ID 17667 Rev 2 STEVAL-CCA025V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 23-Jun-2010 1 Initial release. 22-Sep-2011 2 The device under evaluation has been changed. Updated Figure 1: Circuit schematics. Doc ID 17667 Rev 2 3/4 STEVAL-CCA025V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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