Texas Instruments PCM186x Audio ADCs with Universal Front End

Texas Instruments PCM186x Audio ADCs with Universal Front End help designers integrate European Ecodesign in high-performance end products. By eliminating the need for a 5V supply or an external programmable-gain amplifier, PCM186x Audio ADCs enable designers to develop smaller, smarter products. The PCM186x family's highly flexible front end supports input levels from small-mV microphone inputs to 2.1V_RMS line inputs without external resistor dividers. Using a single 3.3V power supply, PCM186x integrates many system-level functions that assist or replace some DSP functions. An integrated bandgap voltage reference provides excellent PSRR, so that a dedicated analog 3.3V rail may not be required. Available in 2- and 4-channel versions, these 110dB audio ADCs from Texas Instruments are ideal for home theater and TV, BLUETOOTH^® speakers, and microphone array processors.

Features

Universal analog mic input, 2.1V_RMS full scale
- 8 analog inputs with MUX and PGA
- Analog pre-mix function before PGA/MUX
- Single-ended, Pseudo-differential or differential inputs with mic bias
- 4x digital microphone inputs
Up to 4 mono ADC channels (PCM1865)
Hardware control (PCM1861)
I²C or SPI control (PCM1863/5)
H/W programmable gain amplifier
- Fixed mic pre-gain select: 20dB, 32dB (analog)
S/W programmable gain amplifier
Integrated high-performance audio PLL

Single 3.3V supply for analog and digital
- Additional 1.8V core and interface for lower power consumption
Power dissipation at 3.3V: <85mW (PCM1861/3), <145mW (PCM1865)
'EnergySense' audio content detector - for auto system wakeup and sleep
Master or slave audio interface:
Mixer functionality:
- Digital mixer to mix ADC outputs and I²S synchronous inputs
- Zero crossing PGA gain changes
Automatic PGA clipping suppression control