AK4649 Datasheet, PDF (56/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK-AMP

[AK4649]
■ Analog Mixing: Mono Input
When the PMBP bit is set to “1”, the mono input is powered-up. When the BEEPS bit is set to “1”, the input signal from
the MIN pin is output to Speaker-Amp. When the BEEPH bit is set to “1”, the input signal from the MIN pin is output to
a stereo line output amplifier. When BPM bit is set to “0”, the external resister Ri adjusts the signal level of MIN input.
When BPM bit is “0”, the external resister R_i is not needed. BPLVL2-0 bits control the MIN-Amp gain. Table 49, and
Table 50 show the typical gain example at R_i = 33kΩ This gain is in inverse proportion to R_i
BPM bit
BEEP Mode
0
External Resistance Mode
1
Internal Resistance Mode
Table 48. BEEP Mode Setting
(default)
1. External Resistance Mode (BPM bit = “0”)
MIN pin
Ri
BEEPL
LOUT/ROUT pin
MIN-Amp
BEEPS
SPP/SPN pin
Figure 38. Block Diagram of MIN pin (BPM bit =“0”)
LOVL1-0 bits
MIN → LOUT/ROUT
00
0dB
(default)
01
+2dB
10
+4dB
11
+6dB
Table 49.MIN → AOUT Output Gain (typ) at R_i = 33kΩ
SPKG1-0 bits
MIN → SPP/SPN
ALC2 bit = “0”
ALC2 bit = “1”
00
+3.3dB
+5.3dB
01
+5.3dB
+7.3dB
10
+7.3dB
+9.3dB
11
+9.3dB
+11.3dB
Table 50.MIN → SPK Output Gain (typ) at R_i = 33kΩ
(default)
MS1023-E-01
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2010/08