WM8961 datasheet(47/116 Pages) WOLFSON

No de pièce	WM8961

Description	Ultra-Low Power Stereo CODEC with 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers

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Fabricant	WOLFSON [Wolfson Microelectronics plc]

Site Internet	http://www.wolfsonmicro.com

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47 / 116 page

WM8961

Pre-Production

w

PP, August 2009, Rev 3.1

47

Note that the register write to CP_DYN_PWR[1:0] must take place before the charge pump is

enabled. See the “Charge Pump” section.

SPEAKER OUTPUTS

The SPK_LP/SPK_LN and SPK_RP/SPK_RN output pins are class D speaker drivers. Each pair is

independently controlled and can drive an 8

Ω BTL speaker. Output PGA volume is relative to AVDD,

while an additional boost stage (set by CLASSD_ACGAIN[2:0] ) is available to accommodate higher

SPKVDD1/SPKVDD2 supply voltages. This allows AVDD to be run at a lower voltage to save power,

while maximum output power can be delivered to the load, utilising the full range of SPKVDD1 and

SPKVDD2 supplies.

The output gain stage automatically centers the analogue output about

SPKVDD/2. This will avoid the analogue output clipping – except in the case of

CLASSD_ACGAIN=12dB. The speaker output stage is illustrated in Figure 20

Figure 20 Speaker Output Stage

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