AK5365 Datasheet, PDF (20/41 Pages) Asahi Kasei Microsystems – 24-BIT 96KHZ ADC WITH SELETOR/PGA/ALCl

ASAHI KASEI
[AK5365]
„ Input Attenuator
The input ATTs are constructed by adding the input resistor (Ri) for LIN1-5/RIN1-5 pins and the feedback resistor (Rf)
between LOPIN (ROPIN) pin and LOUT (ROUT) pin (Figure 7). The input voltage range of the IPGAL/IPGAR pin is
typically 0.2 x AVDD (Vrms). If the input voltage of the input selector exceeds 0.2 x AVDD, the input voltage of the
IPGAL/IPGAR pins must be attenuated to 0.2 x AVDD by the input ATTs. Table 9 shows the example of Ri and Rf.
Ri LIN1
LOPIN
Rf
LOUT
IPGAL
Ri LIN2
Ri LIN3
Ri LIN4
Ri LIN5
Pre-Amp
To IPGA
Ri RIN1
Ri RIN2
Ri RIN3
Ri RIN4
Pre-Amp
To IPGA
Ri RIN5
• Example for input range
Input Range
4Vrms
2Vrms
1Vrms
ROPIN ROUT
Rf
Figure 7. Input ATT
IPGAR
Ri [kΩ]
47
47
47
Rf [kΩ]
ATT Gain [dB]
12
−11.86
24
−5.84
47
0
Table 9. Input ATT example
IPGAL/R pin
1.02Vrms
1.02Vrms
1Vrms
MS0164-E-01
- 20 -
2002/08