AK4103A_09 Datasheet, PDF (19/27 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit DIT

[AK4103A]
■ Line Driver
There is an RS422 line driver on chip. The AES3 specification states that the line driver shall have a balanced output
with an internal impedance of 110 ohms ±20% and also requires a balanced output drive capability of 2 to 7 volts peak-
to-peak into 110 ohm load. The internal impedance of the RS422 driver along with a series resistors of 56 ohms realizes
this requirement. For consumer use(S/PDIF), the specifications require an output impedance of 75 ohms ±20% and a
driver level of 0.5±20% volts peak to peak. A combination of 330 ohms in parallel with 100 ohms realizes this
requirement. The outputs can be set to ground by resetting the device or a software mute.
TXP
TXN
56
0.1u
Transformer
XLR Connector
Figure 17. Professional Output Driver Circuit
TXP
TXN
330
100
0.1u
Transformer
RCA Phono
Connector
Figure 18. Consumer Output Driver Circuit
MS0251-E-01
- 19 -
2009/01