ak4537 AKM Semiconductor, Inc., ak4537 Datasheet - Page 29

• Manufacturer Part Number: ak4537
• Description: 16-bit 6 Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
„ De-emphasis Filter
The AK4537 includes the digital de-emphasis filter (tc = 50/15 s) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter (Table 16).
„ Bass Boost Function
The BST1-0 bits control the amount of low frequency boost applied to the DAC output signal (Table 17) . If the BST1-0
bits are set to “10” (MID Level), use a 47 F capacitor for AC-coupling. If the boosted signal exceeds full scale, the analog
output clips to the full scale. Figure 10 shows the boost frequency response at –20dB signal input.
MS0202-E-04
-10
-15
-20
-25
-5
0
0.01
DEM1
BST1
0
0
1
1
0
0
1
1
Figure 23. Boost Frequency (fs=44.1kHz)
Table 17. Low Frequency Boost Control
MIN
Boost Frequency (fs=44.1kHz)
Table 16. De-emphasis Control
DEM0
0
1
0
1
BST0
0.1
0
1
0
1
Frequency [kHz]
- 29 -
MAX
44.1kHz
48kHz
32kHz
Mode
OFF
Mode
MAX
MID
MIN
MID
OFF
1
Default
Default
10
[AK4537]
2005/04