低功耗PCM1770/1771音频DAC芯片：高保真与超省电设计

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PCM1770和PCM1771是两款低功耗的立体声音数字模拟转换器(DAC)芯片，专为现代电子设备设计，特别适用于对功耗、体积和音频质量有高要求的应用。这些单电源（1.6V至3.6V）CMOS集成电路集成了关键的音频功能，如立体声DAC、耳机放大器电路以及支持电路，全部封装在紧凑的TSSOP-16和VQFN-20封装内。这些器件的核心特点是它们的低电压兼容性，能够在2.4V电源下正常工作，这对于便携式音频播放器、移动电话（如PDA）、手机和其他对低电压敏感的应用场景非常适用。它们提供了出色的音频性能，包括动态范围高达98分贝典型值，这确保了音频信号在转换过程中损失极小，达到自然失真(NTHD + Nf)典型值为0.1%和在-20分贝时达到0.04%。对于输出功率，PCM1770和PCM1771在16欧姆负载下的立体声输出功率可以达到13毫瓦，而单声道则可提供26毫瓦，足以驱动大多数标准耳机。它们采用TI公司先进的多级Δ-Σ架构，结合噪声整形技术，提高了音频信号的转换精度，并且还支持软件控制，这意味着用户可以根据需要灵活地调整和管理音频设置。此外，这些芯片的采样频率范围广泛，从5千赫兹到50千赫兹，能够适应不同音频源和系统需求。它们的低功耗特性引人注目，仅在VCC供电状态下，待机状态下功耗仅为6.5毫瓦，这对于电池续航和整体设备效率具有显著贡献。 PCM1770-低功耗立体声音DAC芯片是设计轻巧、便携式音频设备的理想选择，无论是对于追求音质的个人消费者还是需要高效能音频解决方案的制造商，都提供了理想的解决方案。其集成的音频处理能力、低功耗特性和广泛的频率支持，使其成为现代电子产品的必备组件。

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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 V

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 V

OUT

L 9 O L-channel analog signal output of the headphone amplifiers

OUT

R 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

12 – Power supply for all analog circuits except the headphone amplifier.

COM

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 V

nominal.

11 – Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V

Submit Documentation Feedback

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TERMINAL FUNCTIONS (CONTINUED)

PCM1770 , PCM1771

SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007

PCM1771PW

TERMINAL

I/O DESCRIPTION

NAME NO.

AGND 5 – Analog ground. This is a return for V

AIN 10 – Monaural analog signal mixer input. The signal can be mixed with the outputs of the L- and R-channel DACs.

AMIX 14 I Analog mixing control

BCK 3 I Serial bit clock. Clocks the individual bits of the audio data input, DATA.

DATA 2 I Serial audio data input

DEMP 13 I De-emphasis control

FMT 15 I Data format select

HGND 6 – Analog ground. This is a return for V

OUT

L 9 O L-channel analog signal output of the headphone amplifiers

OUT

R 8 O R-channel analog signal output of the headphone amplifiers

LRCK 1 I 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.

PD 4 I Reset input. When low, the PCM1771 device is powered down, and all mode control registers are reset to

default settings.

SCKI 16 I System clock input

12 – Power supply for all analog circuits except the headphone amplifier.

COM

7 – 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 V

nominal.

11 – Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V

PCM1771RGA

TERMINAL

I/O DESCRIPTION

NAME NO.

AGND 4 – Analog ground. This is a return for V

AIN 10 – Monaural analog signal mixer input. The signal can be mixed with the outputs of the L- and R-channel DACs.

AMIX 14 I Analog mixing control

BCK 2 I Serial bit clock. Clocks the individual bits of the audio data input, DATA.

DATA 1 I Serial audio data input

DEMP 13 I De-emphasis control

FMT 15 I Data format select

HGND 5 – Analog ground. This is a return for V

OUT

L 9 O L-channel analog signal output of the headphone amplifiers

OUT

R 7 O R-channel analog signal output of the headphone amplifiers

LRCK 20 I 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.

NC 8, 17, – No connect

18, 19

PD 3 I Reset input. When low, the PCM1771 device is powered down, and all mode control registers are reset to

default settings.

SCKI 16 I System clock input

12 – Power supply for all analog circuits except the headphone amplifier

COM

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 V

nominal.

11 – Analog power supply for the headphone amplifier circuits. The voltage level must be the same as V

Submit Documentation Feedback

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