WM8985GEFL Wolfson Microelectronics, WM8985GEFL Datasheet - Page 60

• Manufacturer Part Number: WM8985GEFL
• Description: Audio CODECs Multimedia CODEC with Class D HP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8985GEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8985
w
Table 24 DAC Digital Limiter Control
5-BAND GRAPHIC EQUALISER
Table 25 EQ and 3D Enhancement DAC or ADC Path Select
Table 26 EQ Band 1 Control
A 5-band graphic equaliser is provided, which can be applied to the ADC or DAC path, together with
3D enhancement, under control of the EQ3DMODE register bit.
Note: The ADCs and DACs must be disabled before changing the EQ3DMODE bit.
The equaliser consists of low and high frequency shelving filters (Band 1 and 5) and three peak
filters for the centre bands. Each has adjustable cut-off or centre frequency, and 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.
R18 (12h)
EQ Control 1
R18 (12h)
EQ Band 1
Control
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
6:4
8
4:0
6:5
BIT
BIT
BIT
LIMLVL
EQ3DMODE
EQ1G
EQ1C
LABEL
LABEL
LABEL
000
1
01100
(0dB)
01
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
applied to ADC path
1 = Equaliser and 3D Enhancement
applied to DAC path
Band 1 Gain Control. See Table 31 for
details.
Band 1 Cut-off Frequency:
00 = 80Hz
01 = 105Hz
10 = 135Hz
11 = 175Hz
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, Rev 4.6, July 2009
Production Data
60