WM8986GECO/V Wolfson Microelectronics, WM8986GECO/V Datasheet - Page 35

• Manufacturer Part Number: WM8986GECO/V
• Description: Audio Amplifiers Class D Headphone DAC + Line Out
• Manufacturer: Wolfson Microelectronics

Specifications of WM8986GECO/V

• Product: Class-D
• Output Power: 40 mW
• Thd Plus Noise: - 86 dB
• Operating Supply Voltage: 1.71 V to 3.6 V, 2.5 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 16 Ohms
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.71 V, 2.5 V
• Output Type: Differential
• Package / Case: QFN-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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Table 13 DAC Digital Limiter Control
5-BAND GRAPHIC EQUALISER
A 5-band graphic equaliser is provided, which can be applied to the DAC path, together with 3D
enhancement, under control of the EQ3DEN register bit.
Table 14 EQ and 3D Enhancement enable
Note: The DACs must be disabled before changing the EQ3DEN bit.
A 5-band graphic equaliser consists of low and high frequency shelving filters (Band 1 and 5) and
three peak filters for the centre bands.
selectable boost (+/- 12dB in 1dB steps). The peak filters have selectable bandwidth.
To enable the use of the 5-band equaliser the device must be in 128fs mode by setting M128ENB to
1 in register R7 bit 8. Refer to the Low Power section under Power Management below for more
details.
Table 15 EQ Band 1 Control
Table 16 EQ Band 2 Control
R18 (12h)
EQ Control 1
R18 (12h)
EQ Band 1
Control
R19 (13h)
EQ Band 2
Control
REGISTER
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
ADDRESS
6:4
8
4:0
6:5
4:0
6:5
8
BIT
BIT
BIT
BIT
LIMLVL
EQ3DEN
EQ1G
EQ1C
EQ2G
EQ2C
EQ2BW
LABEL
LABEL
LABEL
LABEL
000
1
01100
(0dB)
01
01100
(0dB)
01
0
Each has adjustable cut-off or centre frequency, and
DEFAULT
DEFAULT
DEFAULT
DEFAULT
Programmable signal threshold level
(determines level at which the limiter
starts to operate)
000 = -1dB
001 = -2dB
010 = -3dB
011 = -4dB
100 = -5dB
101 to 111 = -6dB
0 = Equaliser and 3D Enhancement
disabled
1 = Equaliser and 3D Enhancement
enabled
Band 1 Gain Control. See Table 20 for
details.
Band 1 Cut-off Frequency:
00 = 80Hz
01 = 105Hz
10 = 135Hz
11 = 175Hz
Band 2 Gain Control. See Table 20 for
details.
Band 2 Centre Frequency:
00 = 230Hz
01 = 300Hz
10 = 385Hz
11 = 500Hz
Band 2 Bandwidth Control
0 = narrow bandwidth
1 = wide bandwidth
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, Rev 4.1, June 2009
WM8986
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