DEMOBOARD-U4091BM Atmel, DEMOBOARD-U4091BM Datasheet - Page 28

• Manufacturer Part Number: DEMOBOARD-U4091BM
• Description: BOARD DEMO FOR U4091BM
• Manufacturer: Atmel

Specifications of DEMOBOARD-U4091BM

• Main Purpose: Telecom, Phone IC, Corded
• Embedded: No
• Utilized Ic / Part: U4091BM
• Primary Attributes: DTMF, Speech Circuit, Tone-ringer, Voice Switch
• Secondary Attributes: Serial Bus MCU Interface
• Interface Type: Serial
• Operating Voltage: 12 V
• Operating Temperature Range: - 22 C to + 75 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: U4091BM

Figure 15-2. Audio Frequency Signal Management U4091BM-R
28
Intercom
Answering
Handset
machine
phone
phone
micro-
micro-
U4091BM-R
Line
AMPB
MIC1
MIC2
MIC3
VL
0 dB
0 dB
The 3 programmable parameters are
ST
1. LF (gain at low frequency)
2. P (the pole position of the low-pass)
3. SL (sidetone slope; the pole frequency of the high-pass)
30 dB --> 12 dB
f(P)
STO_DIFF(LF) = (–10 dB – 2 dB + 0.5 dB
LF has 15 programming steps of 0.5 dB
LF(0) provides –2 dB gain, LF(15) provides 5.5 dB gain
The P adjustment has 31 steps. P(0) means the lowpass determined by the external
application (RST, CST). The internally processed low-pass frequency is fixed by the fol-
lowing equation.
The SL has 3 steps. SL(0) is a lower frequency of the high-pass. SL(3) is a higher fre-
quency of the high-pass. SL can be used to influence the suppression at high
frequencies.
-3 dB to -10 dB and 7 dB (NWT)
6 dB steps
balancing
generator
Sidetone
=
DTMF
--------------------------------------------------- -
2
7 dB --> 0 dB and
20 dB (NWT)
7 dB --> -48 dB
CST
1 dB steps
1 dB steps
1
Filter
-->
RST
0 dB
0 dB
Offset
cancel
< -24 dBm/
Offset
cancel
-22 dBm >
DTMF
1.122
P
LRX
DTMF
MIC
AMPB
AGCO
Switching
matrix
AMREC
RXLS
AGCI
EPO
LTX
LF + 9 dB)
26 dB --> -3 dB and
-10 dB (DTMF)
9 dB --> 2 dB
32 dB --> -23dB
cancel
Offset
0 dB
0 dB
-10 dB
1 dB steps
1.5dB steps
1 dB steps
LTX
AGC
6 dB
8 dB
MOD
AMREC
RECO1
RECO2
SAO1
SAO2
VL
Answering
machine
Loud-
speaker
Earpiece
DTMF
< -34 dBm/
-32 dBm >
Line
4872A–CORD–08/05