Features: • Audio Performance− 102dB SNR ('A' weighted @ 48kHz)− -90dB THD
• ADC Sampling Frequency: 32kHz 96kHz
• Four stereo ADC inputs with analogue gain adjust from+24dB to 21dB in 0.5dB steps
• Digital gain adjust from -21.5dB to -103dB.
• Programmable Automatic Level Control (ALC) or Limiter onADC input
• 3-Wire SPI Compatible or 2-wire Serial Control Interface
• Master or Slave Clocking Mode
• Programmable Audio Data Interface Modes− I2S, Left, Right Justified or DSP− 16/20/24/32 bit Word Lengths
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation
• 5V tolerant digital inputsApplication• Surround Sound AV Processors and Hi-Fi systems
• Automotive AudioPinout
Specifications
| CONDITION |
MIN |
MAX |
| Digital supply voltage |
-0.3V |
+3.63V |
| Analogue supply voltage |
-0.3V |
+7V |
| Voltage range digital inputs (DI, CL, CE and MODE) |
DGND -0.3V |
+7V |
| Voltage range digital inputs (MCLK, ADCLRC and BCLK) |
DGND -0.3V |
DVDD + 0.3V |
| Voltage range digital inputs |
DGND -0.3V |
VDD +0.3V |
| Master Clock Frequency |
|
37MHz |
| Operating temperature range, TA |
-25oC |
+85oC |
| Storage temperature (TQFP package only) |
-65oC |
+150oC |
DescriptionThe WM8775 is a high performance, stereo audio ADCwith a 4 channel input mixer. The WM8775 is ideal fordigitising multiple analogue sources for surround soundprocessing applications for home hi-fi, automotive andother audio visual equipment.
A stereo 24-bit multi-bit sigma delta ADC is used with afour stereo channel input selector. Each channel hasprogrammable gain control. Digital audio output wordlengths from 16-32 bits and sampling rates from 32kHzto 96kHz are supported.
The audio data interface supports I2S, left justified, rightjustified and DSP digital audio formats.
The WM8775 is controlled via a 2 or 3 wire serial interface.The interface provides access to all features includingchannel selection, volume controls, mutes, de-emphasisand power management facilities.
The WM8775 is available in a 28-pin SSOP package. TheWM8775 is software compatible with the WM8776.
WM8775 Data Sheet
