Preliminary Information
MT91600
Component List* for a Typical Application with a Resistive 600Ω Line Impendance -
Refer to
Figure 5 for component designation and recommended configuration
Resistor Values
R1
R3
R5
R7
R9
R11
R13
R15
R17
R19
R21
R23
220Ω 1% (0.15% matched), 1W
43kΩ
220Ω
3kΩ
1kΩ
55kΩ
100kΩ
100kΩ
100kΩ
0Ω
2kΩ
248Ω
Capacitor Values
C1
C3
C5
C7
C9
C11
C13
100nF, 5%
100pF, 5%
3.3nF, 5%
100nF, 20%
100nF, 20%
47pF, 20%
100nF 20%
Diodes and Transistors
D1
D3a/b
Q2
Q4
BAS16 or equivalent
BAV99 dual diode or equivalent
2N2907 or MPSA92 or MMBTA92
2N2907 or MPSA92 or MMBTA92
D2a/b
Q1
Q3
BAV99 dual diode or equivalent
2N2222 or MPSA42 or MMBTA42
2N2222 or MPSA42 or MMBTA42
C2
C4
C6
C8
C10
C12
300nF, 5%
33nF, 20%
1uF, 20%, 16V
0F
100nF, 5%
33nF, 10%
R2
R4
R6
R8
R10
R12
R14
R16
R18
R20
R22
220Ω 1% (0.15% matched), 1W
130kΩ
75kΩ
1kΩ
560kΩ
112kΩ
100kΩ
138kΩ
75kΩ
2kΩ
1kΩ
Note: All resistors are 1/4 W, 1% unless otherwise indicated.
*Assumes Z
o
= Z
NB
= 600Ω, Gain 2 - 4 = -1dB, Gain 4 - 2 = -1dB.
Decoupling capacitors, (1uF, 100V, 20%), can be added to V
DD
, V
EE
, V
BAT
and V
RLY
to provide improved
PSRR performance.
K1
=
Electro-mechanical relay, 5V, DPDT/2 FORM C
PR1
=
This device must always be fitted to ensure damage does not occur from inductive loads.For
simple applications, PR1 can be replaced by a single TVS, such as 1.5KE220C, across tip and ring. For
applications requiring lightning and mains cross protection further circuitry will be required and the following
protection devices are suggested: P2353AA, P2353AB (Teccor), THBT20011, THBT20012, THBT200S (SGS-
Thomson), TISP2290, TSSP8290L (T.I.)
9
MITEL [ MITEL NETWORKS CORPORATION ]
