采用麦克风偏置、ALC、音效和陷波滤波器的 90dB SNR 低功耗立体声音频 ADC
| Number of ADC channels | 2 |
| Analog inputs | 2 |
| Digital audio interface | DSP, I2S, L, R |
| Control interface | I2C, SPI |
| Sampling rate (Max) (kHz) | 50 |
| ADC SNR (Typ) (dB) | 90 |
| Rating | Catalog |
| | |
- Analog Front End:
- Stereo Single End Input With MUX
- Mono Differential Input
- Stereo Programmable Gain Amplifier
- Microphone Boost Amplifier and Bias
- Analog Performances Dynamic Range: 90 dB
- 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
- Low Power Dissipation:
- 13 mW in Record, 1.8/2.4 V, 48 kHz, Stereo
- 5.3 mW in Record, 1.8/2.4 V, 8 kHz, Mono
- 3.3 μW in All Power Down
- Sampling Frequency: 5 kHz to 50 kHz
- Auto Level Control for Recording
- Operation by 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 Soft Mute
- Power Up/Down Control for Each Module
- 30-dB to -12-dB Gain for Analog Inputs
- 0/12/20-dB Boost for Microphone Input
- Parameter Settings for ALC
- Three-Band Tone Control and 3D Sound
- High-Pass Filter and Two-Stage Notch Filter
- Pop Noise Reduction Circuit
- Package:
- 24-QFN (4 mm × 5 mm)
- 24-DSBGA (2.49 mm × 3.49 mm)
- Operation Temperature Range: -40°C to 85°C
- APPLICATIONS
- Portable Audio Player, Cellular Phone
- Video Camcorder, Movie Digital Still Camera
- PMP/DMB, Voice Recorder
The PCM1870 is a low-power stereo ADC designed for portable digital audio applications, with line-input amplifier, boost amplifier, microphone bias, programmable gain control, sound effects, and auto level control (ALC). It is available in 24-QFN (4-mm × 5-mm) and 24-DSBGA (2.49-mm × 3.49-mm) packages to save footprint. The PCM1870 accepts right-justified, left-justified, I2S, and DSP formats, providing easy interfacing to audio DSP and encoder chips. Sampling rates up to 50 kHz are supported. The user-programmable functions are accessible through a 2- or 3-wire serial control port.
