AK4950 Datasheet, PDF (60/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
■ Line Sharing of Mic Input and Stereo Lineout in External Circuit (LIN1/RIN1, LOUT/ROUT pin)
The LIN1 (or RIN1) pin and the LOUT (or ROUT) pin of the AK4950 can share a line in external circuit. When using the
LIN1(or RIN1) pin as ADC input, the LOUT(or ROUT) pin is pulled up (typ. 200kΩ) to typ. 1.35V* by setting PMADC=
LOPS= EXTC bits= “1”. When using the LOUT (or ROUT) pin as DAC output, the LIN1 (or RIN1) pin is pulled up (typ.
100kΩ) to typ. 1.35V* by setting PMADC=LOPS bits = “0” and EXTC bit = “1”.
PMADC bit
LOPS bit
(PMLO bit = “1”)
1
1
EXTC bit
1
LIN1/RIN1 pins
Normal Operation
LOUT/ROUT pins
Pull-up to typ. 1.35V (*)
by 200kΩ (typ)
Figure
Figure 44
1
0
1
Normal Operation
Normal Operation
-
0
1
1
Pull-up to typ. 1.35V (*) Pull-up toR typ. 1.35V (*)
by 100kΩ (typ)
by 200kΩ (typ)
0
0
1
Pull-up to typ. 1.35V (*)
by 100kΩ (typ)
Normal Operation
x
x
0
Can Not Share a Line
Table 45. LIN1/RIN1 and LOUT/ROUT Mode Setting (x: Don’t care)
* When LOVL0 bit = “0”. 1.43V (typ) if the LOVL0 bit = “1”
-
Figure 45
-
1.35V(*)
typ 100kΩ
ADC
AVDD
LIN1(RIN1) pin
1.35V(*)
typ 200kΩ
AVDD
DAC
Line out -amp
LOUT(ROUT) pin
From Jack of Apprication
Figure 44. LIN1/RIN1→ADC path: External Line Share
(PMADC = LOPS = EXTC bits = “1”)
* When LOVL0 bit = “0”. 1.43V (typ) if the LOVL0 bit = “1”
MS1320-E-00
- 60 -
2011/10