AK5367 Datasheet, PDF (19/28 Pages) Asahi Kasei Microsystems – 96kHz 24-Bit ΔΣ ADC with 0V Bias Selector

[AK5367]
■ Pre-Amp and Input Attenuator
The input ATTs are constructed by adding the input resistor (Ri) for LIN1-4/RIN1-4 pins and the feedback resistor (Rf)
between LOPIN/ROPIN pin and LOUT/ROUT pin (Figure 13). The input voltage range of the LISEL/RISEL pin is
typically 0.6 x AVDD (Vpp). If the input voltage of the input selector exceeds typ. 0.6 x AVDD, the input voltage of the
LISEL/RISEL pins must be attenuated to 0.6 x AVDD by the input ATTs. Table 5 shows the example of Ri and Rf.
Rf
C1=10μF
Ri LIN1
LOPIN LOUT
LISEL
Ri LIN2
Ri LIN3
Ri LIN4
Pre-Amp
ADC
Ri RIN1
Ri RIN2
Ri RIN3
Ri RIN4
Pre-Amp
ADC
ROPIN ROUT
RISEL
Rf _C1=10μF
Figure 13. Pre-Amp and Input ATT
• Example for input range
Input Range
4Vrms
2Vrms
1Vrms
Ri [kΩ]
47
47
47
Rf [kΩ]
ATT Gain [dB]
12
−11.86
24
−5.84
47
0
Table 5. Input ATT example
LISEL/RISEL pin
1.02Vrms
1.02Vrms
1Vrms
Note: The value of Ri is over 10kΩ.
MS0694-E-00
- 19 -
2007/12