SLAS831D March 2014 – March 2018 PCM1860 , PCM1861 , PCM1862 , PCM1863 , PCM1864 , PCM1865
PRODUCTION DATA.
The PCM186x powers the device using the pins shown in Figure 68.
The PCM186x uses a combination of 3.3-V functional blocks and 1.8-V functional blocks to achieve high analog performance, combined with high levels of digital integration. As such, the device has three internal power rails. AVDD provides the analog circuits with a clean 3.3-V rail. DVDD is used for 3.3-V digital clock circuits. Externally, AVDD and DVDD can be connected together without significant impact to performance. The final rail, IOVDD, is used for driving the input/output digital circuitry.
The PCM186x integrates an on-chip LDO to convert an external 3.3 V to the 1.8 V required by the digital core. The LDO input is derived from IOVDD. Power-supply pin descriptions are listed in Table 24.
NAME | DESCRIPTION |
---|---|
AVDD | Analog voltage supply (3.3 V) that powers the ADC, PGA, reference, and secondary ADC. |
DVDD | Digital voltage supply (3.3 V) that is used for the PLL and the oscillator circuit. |
IOVDD | Input/output pin voltage. Also used as a source for the internal LDO for the digital circuit. |
LDO | Output from the on-chip LDO that is used with a 0.1-µF decoupling capacitor. Can be driven (used as power input) with a 1.8-V supply to bypass the on-chip LDO for lower power consumption. |
AGND | Analog ground |
DGND | Digital ground |