AK4636 Datasheet, PDF (60/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ BEEP input and Generating Circuit
The AK4636 has the BEEP pin (external signal input pin) and BEEP generating circuit.
BEEP Mode can be set by BPM1-0 bits.
BPM1 bit
0
0
1
1
BPM0 bit
BEEP Mode
0
Disable
1
BEEP pin
(Internal Resisitance mode)
0
BEEP pin
(External Resisitance mode)
1
BEEP Generator mode
Table 43. BEEP Mode Settings
(default)
1. BEEP input pin (BPM1-0 bits =“01” or “10”)
When BMP1-0 bits = “01” or “10”, the input signal to BEEP pin is output from the speaker amplifier by setting BEEPS
bits to “1”, and it is output from Mono lineout amplifier by setting BEEPA bit to “1”.
BPM1-0 bits = “10”
R_i can control the BEEP signal gain which is in invert proportional to R_i resister value (Figure 49). The gain setting can
not be made by BPLVL2-0 bits.
BPM1-0 bits = “01”
The BEEP signal gain is controlled by BPLVL2-0 bits (Table 46). R_i is not necessary.
BEEP
Ci
Ri
33kΩ ± 30%
-
+
Figure 49. Block Diagram of BEEP pin (BPM1-0 bits =“10”)
SPKG1-0 bits BEEP → SPP/SPN Gain
00
+10.6dB
01
+12.6dB
10
+14.6dB
11
+16.6dB
Table 44.BEEP → SPK Output Gain
LOVL bit
BEEP → AOUT Gain
0
0dB
1
+3dB
Table 45.BEEP → AOUT Output Gain
MS1012-E-01
- 60 -
2010/08