Preliminary Information
AC Electrical Characteristics
†
- MH88422 All Variants
Characteristics
1
2
3
4
Input Impedance VR
Output Impedance at VX
Receive Gain (VR to 2-Wire)
Frequency Response Gain
(relative to Gain @ 1kHz)
All Variants
5
Signal Output Overload Level
at 2-Wire
at Vx
Total Harmonic Distortion
BD-1 Variant at 2-Wire
All other Variants at 2-Wire
All Variants
at VX
Power Supply Rejection Ratio
BD-1 Variant at 2-Wire
at VX
All other Variants
8
Transhybrid Loss
at 2-Wire
at VX
THL
THD
1.2
1.2
1.2
PSRR
18
18
12
12
6
40
40
20
20
20
dB
dB
dB
dB
dB
2.0
2.5
2.0
%
%
%
-1
-1
+2.0
+2.0
0
0
+3.0
+3.0
+1
+1
dB
dB
dBm
dBm
2.5
Sym
Min
Typ
‡
47k
10
3.5
4.6
Max
Units
Ω
Ω
MH88422
Test Conditions
dB
Test circuit as Fig 6
Input 0.5V at 1kHz
300Hz
3400Hz
THD < 5% @ 1kHz
I
Loop
= 20 to 40mA
Input -3.5dBm at 1kHz
6
7
Ripple 0.1Vrms 1kHz
on V
DD
† Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal +5V and are for design aid only.
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
Note 2: dBm is referenced to 600Ω unless otherwise stated.
Test circuit as Fig 6
Input -3.5dBm,
300-3400Hz at V
R
2-19
MITEL [ MITEL NETWORKS CORPORATION ]
