PSB4860HV4.1 Lantiq, PSB4860HV4.1 Datasheet - Page 59

• Manufacturer Part Number: PSB4860HV4.1
• Manufacturer: Lantiq

Specifications of PSB4860HV4.1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.1.12
The DTMF generator can generate single or dual tones with programmable frequency
and level. This unit is primarily used to generate the common DTMF tones but can also
be used for signalling or other user defined tones. A block diagram is shown in figure 32.
Figure 32 DTMF Generator - Block Diagram
The two frequency generators and level adjustment stages are identical. There are two
modes for programming the generators, cooked mode and raw mode. In cooked mode,
the standard DTMF frequencies are generated by programming a single 4 bit code. In
raw mode, the frequency of each generator can be programmed individually by a
separate register. The unit has two outputs which provide the same signal but with
individually programmable attenuation. Table 30 shows the parameters of this unit.
Table 30
Register # of Bits
DGCTL
DGCTL
DGCTL
DGF1
DGF2
DGL
DGL
DGATT
DGATT
Note: DGF1 and DGF2 are undefined when cooked mode is used and must not be
Data Sheet
written.
1
1
4
15
15
7
7
8
8
DTMF Generator
DTMF Generator Registers
generator
generator
f
f
1
2
Name
EN
MD
DTC
FRQ1
FRQ2
LEV1
LEV2
ATT1
ATT2
lev1
lev2
Comment
Enable for generators
Mode (cooked/raw)
DTMF code (cooked mode)
Frequency of generator 1
Frequency of generator 2
Signal level of generator 1
Signal level of generator 2
Attenuation of S
Attenuation of S
59
9
10
att2
att1
S
S
10
9
PSB 4860
2000-01-14