具有耳机放大器的 93dB SNR 低功耗立体声 DAC（软件控制）
| Number of DAC channels (#) | 2 |
| Analog inputs | 0 |
| Analog outputs | 2 |
| DAC SNR (Typ) (dB) | 93 |
| Sampling rate (Max) (kHz) | 50 |
| Control interface | SPI, I2C |
| Resolution (Bits) | 16 |
| Architecture | Delta-Sigma |
- Analog Front End:
- Stereo Single-Ended Input
- Microphone Amplifier (12 dB, 20 dB)
- Analog Back End:
- Stereo/Mono Line Output With Volume
- Stereo/Mono Headphone Amplifier With Volume
- Analog Performance:
- Dynamic Range: 93 dB
- 40-mW + 40-mW Headphone Output at RL = 16
- Power Supply Voltage
- 1.71 V to 3.6 V for Digital I/O Section
- 1.71 V to 3.6 V for Digital Core Section
- 2.4 V to 3.6 V for Analog Section
- 2.4 V to 3.6 V for Power Amplifier Section
- Low Power Dissipation:
- 6.4 mW in Playback, 1.8 V/2.4 V, 44.1 kHz
- 3.3 μW in Power Down
- Sampling Frequency: 5 kHz to 50 kHz
- Operation From a Single Clock Input Without PLL
- System Clock:
- Common-Audio Clock (256 fS/384 fS), 12/24, 13/26, 13.5/27, 19.2/38.4, 19.68/39.36 MHz
- 2 (I2C?) or 3 (SPI) Wire Serial Control
- Programmable Function by Register Control:
- Digital Attenuation: 0 dB to -62 dB
- Digital Gain of DAC: 0, 6, 12, 18 dB
- Power Up/Down Control for Each Module
- 6-dB to -70-dB Gain for Analog Outputs
- 0/12/20 dB for Microphone Input
- 0-dB to -21-dB Gain for Analog Mixing
- Three-Band Tone Control and 3D Sound
- Analog Mixing Control
- Pop-Noise Reduction Circuit
- Short Protection Circuit
- Package: 4-mm × 4-mm QFN Package
- Operation Temperature Range: -40°C to 85°C
- APPLICATIONS
- Portable Audio Player, Cellular Phone
- Video Camcorder, Digital Still Camera
- PMP/DMB/PND
I2C is a trademark of Philips Electronics.
The PCM1774 is a low-power stereo DAC designed for portable digital audio applications. The device integrates headphone amplifier, line amplifier, line input, boost amplifier, programmable gain control, analog mixing, and sound effects. It is available in a small-footprint, 4-mm × 4-mm QFN package. The PCM1774 supports right-justified, left-justified, I2S, and DSP formats, providing easy interfacing to audio DSP and decoder/encoder chips. Sampling rates up to 50 kHz are supported. The user-programmable functions are accessible through a two- or three-wire serial control port.
