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參數資料
| 型號： | MC34016 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Cordless Universal Telephone Interface |
| 中文描述： | 通用無繩電話接口 |
| 文件頁數： | 7/16頁 |
| 文件大小： | 315K |
| 代理商： | MC34016 |
MC34016
7
MOTOROLA ANALOG IC DEVICE DATA
With the component values of the typical application, the
inductor has a value of about 2.4 H and RDC1 equals 470 k
.
In the audio range of 300–3400 Hz, these components form
a fairly large parallel impedance to RSET and CSET.
Therefore, the set impedance is mainly determined by the
passive network RSET and CSET. In the typical application,
RSET is 600
,
but it can easily be replaced by a complex
network to obtain a complex set impedance.
Active Set Impedance
An active set impedance can be obtained by placing a
resistor between pin LAI and SRF (RSRF) as shown in
Figure 11. By doing so, the MC34016 itself generates the ac
set impedance and RSET and CSET can be omitted. An
equivalent network now equals:
RDC1
CM
RDC1 x CM x RS
RS
((RDC1 + RSRF) x RS/RSRF) – RS
RSRF
Ignoring the effect of the inductor and the parallel path
RDC1 + RSRF again for audio frequencies, the set
impedance is now determined by:
RS
RSRF
ZSET
x (RDC1
RSRF)
With RS = 50
and RDC1 = 470 k
, RSRF should be 43 k
to obtain a 600
set impedance. To obtain a complex set
impedance, RDC1 can be made complex. In such case, the
dc mask can be adjusted with the dc value of RDC1 and the
set impedance can be adjusted with the ac value of RDC1. An
application with an active set impedance is interesting,
particularly in countries like France, where with the dc current
regulation mask, rather high line voltages can be reached.
With a passive set impedance, this would result in a high cost
for capacitor CSET.
TRANSMIT CHANNEL
Inputs
The inputs Tx1 and Tx2 are designed to handle large signal
levels of up to +3.0 dBm. The input impedance for both Tx1
and Tx2 equals 30 k
. The inputs are designed for
symmetrical as well as asymmetrical use. In asymmetrical
drive, one input can be tied to Gnd via an external capacitor.
Gain
The gain from inputs Tx1 and Tx2 to the line is dependent
on the set impedance, the line load impedance and dc slope
resistor RS in the following way:
ATX
1
6 x RS
x
ZSETx Zline
ZSET
Zline
With ZSET = 600
, Zline = 600
and RS = 50
the gain
equals 0 dB. By setting Bit 4 of Register 2 to 1, the gain is
raised by 6.0 dB.
Outputs
In order to transmit signals to the line, the output stage of
the MC34016 (line driver) modulates the zener previously
described. To guarantee stability of the output stage
capacitor CSTB of 100 pF is required
SIDETONE
The MC34016 is equipped with a double Wheatstone
bridge architecture to optimize sidetone. One sidetone
network is used for short lines and one for long lines.
Switchover between both networks is dependent on line
current and is described in the automatic gain control section.
Different sidetone equations apply depending on whether a
passive or an active set impedance is set.
Sidetone Cancellation with Passive Set Impedance
In a passive set impedance application, the set impedance
is a part of the equations for optimum sidetone. For short
lines optimum cancellation occurs if:
RHS2
RS
with:
Zlineshort = impedance of a short telephone line
and for long lines:
RHL2
RS
with:
Zlinelong= impedance of a long telephone line
ZHS1
x
ZSETx Zlineshort
ZSET
Zlineshort
ZHL1
x
ZSETx Zlinelong
ZSET
Zlinelong
Sidetone Cancellation with Active Set Impedance
In the active set impedance application, the set impedance
does not appear in the equations for optimum sidetone
cancellation as it does in the passive application. For short
lines, optimum cancellation occurs if:
RHS2
RS
and for long lines:
RHL2
RS
ZHS1
x Zlineshort
ZHL1
x Zlinelong
RECEIVE CHANNEL
Inputs
The inputs HYS and HYL have an input resistance of 30 k
and can handle signals up to 800 mVpp. This corresponds to a
signal at the telephone line of about 8.0 dBm in the typical
application. The switchover from HYS to HYL is dependent on
line current and described in the automatic gain control
section.
Gain
The overall gain from the line to the outputs Rx1 and Rx2
for short lines and passive impedance equals:
ARX
7.6 x
R14
′
R14
′
ZHYS
For active impedance it follows:
ARX
7.6 x
R14
′
R14
′
ZHYS
x
1
R1 x ZHYS
R14 x ZSET
In these relations, R14
′
is the resistor R14 in parallel with
the input impedance at HYS of 30 k
. The gain for long
lines can be derived by replacing ZHYS and R14 by ZHYL
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