mt9094apr1 Zarlink Semiconductor, mt9094apr1 Datasheet - Page 22

• Manufacturer Part Number: mt9094apr1
• Description: Fully Featured Digital Telephone Circuit With Embedded Dsp For Tone Generation And Hands Free Operation
• Manufacturer: Zarlink Semiconductor

Addresses:
Applications
To maintain a fully differential topology in the transmit path the suggested connection scheme for the transmit
microphones is shown in Figure 7. However, it is possible to use a single-ended arrangement as shown in Figure 8
for the transmit interface. In this case the dynamic range of the MT9094 is reduced by half. In both figures the
output drivers are connected in a fully differential manner.
The MT9094 is a member of the Zarlink family of digital terminal equipment components. There are two
transmission devices which connect directly with the MT9094 to complete an application; the MT8930 (SNIC) and
the MT8971/72 (DSIC/DNIC). An ISDN 4-wire "TE" function is implemented with the MT8930/MT9094 combination.
A 2-wire digital phone for PABX, key-systems and other proprietary applications is implemented with the
MT8971/72/MT9094 combination.
Figures 9 and 10 show the 4-wire and 2-wire applications, respectively.
Tone Ringer Warble Rate-Tone Ringer
The tone ringer will switch between squarewave frequencies at a warble frequency defined by this register. The relationship between the duration
period of each tone and the 8 bit warble coefficient is as follows:
Tone duration (warble frequency) = 500 / COEF
where: Frequency is in Hz, and 0≤COEF <256
Highest frequency possible:
Lowest frequency possible:
Frequency resolution:
27h to 2Dh are transmit and receive gains and coefficients used by the filters in the handsfree decision cir-
cuit.
2Eh to 3Fh are scratch-pad ram locations used by the DSP algorithms as temporary storage during calcula-
tions.
B7
7
B6
6
B5
5
B4
500 Hz
2.0 Hz
non-linear
4
Zarlink Semiconductor Inc.
B3
3
MT9094
22
B2
2
B1
1
ADDRESS = 26h WRITE/READ VERIFY
B0
0
Power Reset Value
0000 0000
Data Sheet