N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 56

• Manufacturer Part Number: N681622YG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

2.77 dB to +4.08 dB around this ideal setting by programming HB address (0x41). This register can also be used to
disable the Tran hybrid balancing completely. It should also be noted that Tran hybrid Balance adjustments are
independent of any other gain adjustment stages as the level shift occurs on the transmit path before any gain
stages, as can be seen on Figure 3.
The device provides on-chip programmable two-wire impedance settings to meet a wide variety of worldwide two-wire
return loss requirements.
Figure above illustrates the characteristic line impedance model implemented on-chip. Examples of the standard
impedances which the N681386/87 supports are shown below.
Pure Resistive Impedance Settings (for example 600 Ohm and 900 Ohm) can be selected in IM1:ZR1[3:0]. In this
case Complex Impedance Matching should be disabled by setting IMCTRL:IMEN[2] to 1. Register ILIM:ZCPEN[6]
address (0x23) allows magnitude of the AC signal to be increased to compensate for the additional loss at the high
end of the audio frequency range. ILIM:ZCPEN[6] should be enabled for Pure Resistive Impedance Matching cases.
Preliminary Datasheet Rev1.0
12.1.6.1.4.
US PBX, Korea, Taiwan
Standard
Japan CO
Bellcore
CTR21
China CO
China PBX
Japan PBX
Table 24: Examples of Resistive Impedance Matching
Country
Country
IMPEDANCE MATCHING
Figure 19: Characteristic Line Impedance
R1
R1
Page 56 of 164
R1(Ohm)
R1(Ohm)
Requirement Impedance Element
Requirement Impedance Element
600
900
600
900
270
200
200
100
R2
R2
Single Programmable Extended Codec/SLCC
C
C
R2(Ohm)
R2(Ohm)
Open
Open
Open
Open
1000
750
680
560
(Unit)
(Unit)
Zline
Zline
C(Farad)
C(Farad)
Short
Short
150n
100n
100n
100n
2.2u
1u
N681386/87
January 2010