MH88422(1995) データシートの表示（PDF） - Mitel Networks
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MH88422 Datasheet PDF : 12 Pages
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Preliminary Information
MH88422
TIP
D1
14
13
11
C2 10
TIP
RLS
TF
TXIN
MH88422
6 R3
VX
VR
RVLC
7 100k
R5
4
R4
Audio Output
Audio Input
Ring Voltage & Loop
Current Detect Output
RING
9 RING
VDD
3
LC
AGND
Loop Control Input
RECEIVE GAIN:
Audio input to Tip-Ring
=20log(47k/(R5+47K))+3.5dB
= -6.5dB
TRANSMIT GAIN:
Tip-Ring to Audio Output
=20log(R4(R3+R4))-0.4dB
= -6.4dB
Note:
The VX output gain has been reduced by 6dB
(to -6.4dB) and the VR input gain has been
reduced by 9.9dB (to -6.4dB) in this example.
1
2
+
C1
+5V
1) C1: 10µF, 6V Tantalum
2) C2: 0.1µF, 250V (Typical Value)
3) D1: 180VDC Foldback Diode, e.g. TISP4180, TISP5180
4) VX and VR are biased at 2.5V, therefore, coupling capacitors
may be required depending on application.
5) (R3+R4) should be > 2kΩ to prevent overload.
Figure 5 - Typical Application Circuit for Gain Adjustment
TIP
D1
14
TIP
13 RLS
MH88422
6
VX
11
TF
C2 10
TXIN
7
VR
4
RVLC
10µF
Audio Output
Audio Input
10µF
Ring Voltage & Loop
Current Detect Output
RING
Meter
Pulse
Detector
Meter
Pulse
Filter
9
RING VDD
1
+5V
3
LC
AGND
2
+
Loop Control Input
C1
1) C1: 10µF, 6V Tantalum
2) C2: 0.1µF, 250V (Typical Value)
3) D1:180VDC Foldback Diode,
e.g. TISP4180, TISP5180.
Note:
Meter pulses at high frequency (16kHz or 12kHz) and high level (10V RMS) are used in some countries.
The VX amplifier has a low pass filter which attenuates by typically 15dB at 16kHz (For the -1 variant).
If this proves insufficient for specific applications, an LC reject filter is recommended.
Figure 6 - Typical Application Circuit with Meter Pulse Filter and Coupling Capacitor
2-29
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