AK5730 Datasheet, PDF (31/50 Pages) Asahi Kasei Microsystems – 4-Channel Differential Audio ADC for Line & Mic Inputs

[AK5730]
(D) Internal unbalanced sources mode (LIN*1-0 bits = “11”)
Max. unbalanced input voltage < 2V RMS
A digital gain correction of 9.5dB can be applied to unbalanced inputs. Unbalanced input should be possible on either
positive and negative inputs. In this mode, No diagnosis is performed for internal connections.
(E) VBATM pin
The input voltage of the VBATM pin should be adjusted with external resistors as below.
The input voltage range is 0 to AVDD. When the input is AVDD voltage (=3.3V typ.), the SAR outputs Full-scale
data(typ.)
ex.) AVDD=3.3V
R1=2 MΩ, R2=360kΩ
When Battery voltage is 21.6V, the voltage at VBATM pin becomes 3.3V and the SAR outputs Full-scale data.
Battery = 21.6V → Full-scale
Battery
R1
VBATM
R2
Figure 31. VBATM pin
Rev 0.8
- 31 -
2013/06