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PCM1770 Datasheet(PDF) 7 Page - Texas Instruments |
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PCM1770 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 38 page www.ti.com TERMINAL FUNCTIONS (CONTINUED) PCM1770, PCM1771 SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007 PCM1770RGA TERMINAL I/O DESCRIPTION NAME NO. AGND 4 – Analog ground. This is a return for VCC. AIN 10 I Monaural analog signal mixer input. The signal can be mixed with the outputs of the L- and R-channel DACs. BCK 2 I/O Serial bit clock. Clocks the individual bits of the audio data input, DATA. In the slave interface mode, this clock is input from an external device. In the master interface mode, the PCM1770 device generates the BCK output to an external device. DATA 1 I Serial audio data input HGND 5 – Analog ground. This is a return for VHP. HOUTL 9 O L-channel analog signal output of the headphone amplifiers HOUTR 7 O R-channel analog signal output of the headphone amplifiers LRCK 20 I/O Left and right clock. Determines which channel is being input on the audio data input, DATA. The frequency of LRCK must be the same as the audio sampling rate. In the slave interface mode, this clock is input from an external device. In the master interface mode, the PCM1770 device generates the LRCK output to an external device. MC 14 I Mode control port serial bit clock input. Clocks the individual bits of the control data input, MD. MD 13 I Mode control port serial data input. Controls the operation mode on the PCM1770 device. MS 15 I Mode control port select. The control port is active when this terminal is low. NC 8, 17, – No connect 18, 19 PD 3 I Reset input. When low, the PCM1770 device is powered down, and all mode control registers are reset to default settings. SCKI 16 I System clock input VCC 12 – Power supply for all analog circuits except the headphone amplifier. VCOM 6 – Decoupling capacitor connection. An external 10-µF capacitor connected from this terminal to analog ground is required for noise filtering. Voltage level of this terminal is 0.5 VHP nominal. VHP 11 – Analog power supply for the headphone amplifier circuits. The voltage level must be the same as VCC. 7 Submit Documentation Feedback |
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