Features: • Mono ADC:
• Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
• SNR 95dB, THD -85dB ('A'-weighted @ 8 48ks/s)
• Multiple auxiliary analog inputs
• Mic Preamps:
• Differential or single end Microphone Interface- Programmable preamp gain- Psuedo differential inputs with common mode rejection- Programmable ALC / Noise Gate in ADC path
• Low-noise bias supplied for electret microphonesApplication• Digital Still Camera
• General Purpose low power audio ADC
• Games console accessories
• Voice recordersPinout
Specifications
| CONDITION |
MIN |
MAX |
| DBVDD, DCVDD, AVDD, AVDD2 supply voltages |
-0.3V |
+4.2 |
| Voltage range digital inputs |
DGND -0.3V |
DBVDD +0.3V |
| Voltage range analogue inputs |
AGND -0.3V |
AVDD +0.3V |
| Voltage range LACIN, RACIN, LACOUT, RACOUT, MICBIAS |
AGND -0.3V |
MVDD +0.3V |
| Operating temperature range, TA |
-25oC |
+85oC |
| Storage temperature prior to soldering |
30°C max / 85% RH max |
| Storage temperature (TQFP package only) |
-65oC |
+150oC |
DescriptionThe WM8950 is a low power, high quality mono ADC designed for portable applications such as Digital Still Camera, Digital Voice Recorder or games console accessories.
The WM8950 integrates support for a differential or single ended mic. External component requirements are reduced as no separate microphone amplifiers are required.
Advanced Sigma Delta Converters are used along with digital decimation filters to give high quality audio at sample rates from 8 to 48ks/s. Additional digital filtering options are available, to cater for application filtering such as wind noise reduction, noise rejection, plus an advanced mixed signal ALC function with noise gate is provided.
An on-chip PLL of the WM8950 is provided to generate the required Master Clock from an external reference clock. The PLL clock can also be output if required elsewhere in the system.
The WM8950 operates at supply voltages from 2.5 to 3.6V,although the digital supplies can operate at voltages down to 1.71V to save power. Different sections of the chip can also be powered down under software control by way of the selectable two or three wire control interface.
WM8950 is supplied in a very small 4x4mm QFN package,offering high levels of functionality in minimum board area,with high thermal performance.
WM8950 Data Sheet
