“The charge pump output capacitors (C_CP_BULK) must be placed within 2 mm of the CP_OUTP and CP_OUTN pins. Use X7R dielectric, 10 µF, rated for 6.3V.” Failure to follow this causes ripple directly injected into the audio path, manifesting as high-frequency whine.
| Parameter | Symbol | Condition | Min | Typ | Max | Unit | |-----------|--------|-----------|-----|-----|-----|------| | | AVDD | – | 1.7 | 1.8 | 1.9 | V | | Digital Supply | DVDD | – | 1.14 | 1.2 | 1.26 | V | | Quiescent Current (playback) | I_AVDD | 16Ω load, 1mW | – | 12 | 18 | mA | | DAC Dynamic Range | DNR | A-weighted, -60dBFS | 121 | 122 | – | dB | | THD+N | – | 1 kHz, 0 dBFS, 32Ω | – | -105 | -100 | dB | | Channel Separation | Crosstalk | 1 kHz | 110 | 120 | – | dB | | Output Power (32Ω) | P_OUT | THD+N < 1% | – | 30 | 35 | mW | | Output Power (600Ω) | P_OUT (line) | THD+N < 0.01% | – | 2.5 | – | Vrms | | ADC Dynamic Range | – | Mic input, gain = 0 dB | – | 98 | – | dB | wcd9341 datasheet
To achieve the performance listed in the WCD9341 datasheet, follow these layout rules: “The charge pump output capacitors (C_CP_BULK) must be