AK7712A-VT Datasheet, PDF (83/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
[AK7712A-VT]
Accordingly, in the case that power supply voltage of periphery analog circuit is ±15V, then it is needed to protect
the analog input pin from the signal which is more than maximum absolute rating.
Fig.47 Example of Input Buffer Circuit(Differential Input)
Fig.48 Example of Input Buffer Circuit(Single-end Input)
It is also available to input analog signal to AK7712A with single-end. In that case, input the analog signal(in case of
usingthe inner standard voltage, the full-scale is 4.0Vp-p) to AIN-input, and input the bias to AIN+input. But, at using
single-end input type, 2nd harmonic distortion is pretty big, then the features of S/N+D will be worse than at using
differential input (Fig.48).
4. Analog Output
The analog output is single-end type, the output range is 2.9Vpp(typ) and centered on VCOM voltage. outband
noise(shaping noise), which is generated by built-in ∆Σ modulator, is reduced by built-in switched capacitor
filter(SCF) and continuous filter(CTF). Accordingly, it is not needed to add external filter in usual use. The input code
format is 2's complement, and the output is positive full-scale at 7FFFH(@16-bit), the negative full-scale at
8000H(@16-bit) and ideally VCOM voltage at 0000H(@16-bit).
0180-E-02
- 83 -
1997/12