WM8986GECOSLASHV datasheet(23/87 Pages) WOLFSON

23 / 87 page

Pre-Production

WM8986

PP, Rev 3.1, February 2007

CLOCKING SCHEMES

WM8986 offers the normal audio DAC clocking scheme operation, where 256fs MCLK is provided to

the DAC. A flexible clock divider allows the 256fs DAC clock to be generated from a range of input

clock frequencies, for example, 256fs, 384fs, 512fs and 768fs.

A PLL is included which may be used to generate these clocks in the event that they are not

available from the system controller. This PLL can accept a range of common input clock

frequencies between 8MHz and 50MHz to generate high quality audio clocks. If this PLL is not

required for generation of these clocks, it can be reconfigured to generate alternative clocks which

may then be output on the GPIO1 pin and used elsewhere in the system; available in 2-wire control

mode only.

POWER CONTROL

The design of the WM8986 has given much attention to power consumption without compromising

performance. The WM8986 operates at low analog and digital supply voltages, and includes the

ability to power off any unused parts of the circuitry under software control. It also includes standby

and power off modes.

INPUT SIGNAL PATH

The WM8986 has a number of flexible analogue inputs. There are two input channels, Left and

Right, each of which consists of an input PGA stage followed by a boost/mix stage which drives into

the output mixers. Each input path has three input pins which can be configured in a variety of ways

to accommodate single-ended, pseudo-differential or dual differential microphones. There are two

auxiliary input pins which can be fed into to the input boost/mix stage as well as driving into the

output path. An additional signal path exists from the output of the boost/mix stage into the output

left/right mixers.

MICROPHONE INPUTS

The WM8986 can accommodate a variety of microphone configurations including single ended and

pseudo-differential inputs. The inputs to the left differential input PGA are LIN and LIP. The inputs to

the right differential input PGA are RIN and RIP.

WM8986GECO/V Datasheet(PDF) 23 Page - Wolfson Microelectronics plc