Features: • AV receiver on-a-chip with 8 DACs and 2 ADCs
• Integrated S/PDIF/IEC60958/AES3 transceiver
• Analogue Bass Management and stereo mixdown support
• Analogue tone controls for front 3 channels
• Master volume control on each DAC channel with gain rangeof +20dB to -100dB in 1dB steps
• Audio Performance− 108dB SNR ('A' weighted @ 48kHz) DAC− 102dB SNR ('A' weighted @ 48kHz) ADC− 110dB SNR ('A' weighted) Analogue volume control
• DAC Sampling Frequency: 8KHz 192kHz
• ADC Sampling Frequency: 8KHz 192kHz
• 3-Wire SPI or 2-wire MPU Serial Control Interface withreadback.
• Master or Slave Clocking Mode
• Programmable Format Audio Data Interface Modes
• Four Independent stereo DAC outputs with independentdigital volume controls
• Integrated Stereo headphone amplifier with source select
• 5.1 channel analogue input prior to the tone controls, bassmanagement and stereo mixdown functions.
• Six stereo input ADC mux with analogue gain adjust from+24dB to 21dB in 0.5dB steps
• 5V Analogue, 2.7V to 3.6V Digital supply OperationApplication• Surround Sound AV Processors and Hi-Fi systemsPinout
Specifications
| CONDITION |
MIN |
MAX |
| Digital supply voltage |
-0.3V |
+3.63V |
| Analogue supply voltage |
-0.3V |
+7V |
| Voltage range digital inputs (DI, CL, CE an MODE) |
DGND -0.3V |
+7V |
| Voltage range digital inputs (MCLK, DIN, ADCLRC, DACLRC,ADCBCLK and DACBCLK) |
DGND -0.3V |
DVDD + 0.3V |
| Voltage range digital inputs |
AGND -0.3V |
AVDD +0.3V |
| Master Clock Frequency |
|
37MHz |
| Operating temperature range, TA |
-25°C |
+85°C |
| Storage temperature |
-65°C |
+150°C |
DescriptionThe WM8777 is a high performance, multi-channel audio codec.The WM8777 is ideal for surround sound processing applicationsfor home hi-fi, automotive and other audio visual equipment. AS/PDIF transceiver with 4-channel input mux is included. Analoguedomain bass management processing, and front channel analoguetone control facilities are provided.
A stereo 24-bit multi-bit sigma delta ADC is used with a six stereochannel input selector. Each channel has analogue domain muteand programmable gain control. Sampling rates from 8kHz to192kHz are supported.
Four stereo 24-bit multi-bit sigma delta DACs of the WM8777 are provided, whichmay be used to support up to 7.1 channel operation. If preferred,5.1 operation may be chosen, with the spare stereo DAC used tosupport an Aux remote room. Sampling rates from 8kHz to 192kHzare supported. Each DAC channel has independent digital volumeand mute control. A set of input multiplexors allows switching of anexternal 5.1 analogue input, or bypass channel stereo analogueinput into the signal path. The front channel analogue signals maybe looped out of the chip prior to each master volume control, andexternal filtering applied in order to select treble and bass filtercharacteristics. Adjustment of tone controls is then achieved usingon-chip gain adjust amplifiersaddressed via the control interface.Analogue bass management support is provided, plus analoguestereo mixdown options.
The WM8777 is controlled via a serial interface giving access to allfeatures including channel selection, volume controls, tonecontrols, mutes, de-emphasis and power management facilities.The device is available in a 100-pin LQFP package.
WM8777 Data Sheet
