N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 100

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

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Addr.
0x30
Location
ADC output is the signal from ADC coming to DTMF decode. Therefore, the ADC Select bit select either the ADC or
PCM input to the DTMF decode. When DTMFTC[3:0] bits are set to larger values, DTMF detector needs more time
to decode the DTMF signal but the numerical precision is greater.
Bit
6
7
Preliminary Datasheet Rev1.0
DTMFC1
Name
14.6. DTMF DETECTION REGISTER
14.6.1. DTMF CONTROL 1
ADC Output Select
DTMF Enable
Bit Description
DTMFEN
D7
DTMFTC3
0
0
0
0
0
0
0
0
1
1
Time constant used for DTMF frequency estimation
DTMFFDEV[5]
ADCOSEL
ADCOSEL
DTMFEN
DTMFTC2
Bit Name
D6
0
0
1
1
0
0
0
0
1
1
1
1
0
0
DTMF Frequency Deviation
Page 100 of 164
D5
DTMFFDEV
ADC output comes from ADC.
(Receive path)
Disabled
DTMFTC1
DTMFFDEV[4]
0
0
1
1
0
0
1
1
0
0
0
1
0
1
D4
Single Programmable Extended Codec/SLCC
DTMFTC0
0
0
1
0
1
0
1
0
1
0
1
D3
Deviation
(%)
1.5
2.5
3.0
3.5
Bit Value
Constant
D2
Time
DTMFTC
ADC output comes from PCM.
(Transmit path)
Enabled
0
1
2
3
4
5
6
7
8
9
N681386/87
D1
January 2010
1
D0
Default
0x00