MT91L60/61
Advance Information
AC Characteristics† for A/D (Transmit) Path - 0dBm0 = A
- 3.17dB = 1.027Vrms for µ-Law and 0dBm0 = A
Lo3.17
Lo3.14
- 3.14dB =1.067Vrms for A-Law, at the Codec. (V
= 0.4V and VBias=1.5 volts.)
Ref
‡
Characteristics
Sym
Min
Typ
Max
Units
Test Conditions
µ-Law
1
2
Analog input equivalent to
overload decision
ALi3.17
ALi3.14
4.246
4.4
Vp-p
Vp-p
A-Law
Both at Codec
Absolute half-channel gain
Transmit filter gain=0dB
setting.
M ± to Dout
GAX1
GAX2
5.4
14.7
6.0
15.3
6.6
15.9
dB
dB
TxINC = 0*
TxINC = 1*
@1020 Hz
Tolerance at all other transmit
filter settings
-0.2
±0.1
+0.2
dB
(1 to 7dB)
3
4
Gain tracking vs. input level
ITU-T G.714 Method 2
GTX
-0.3
-0.6
-1.6
0.3
0.6
1.6
dB
dB
dB
3 to -40 dBm0
-40 to -50 dBm0
-50 to -55 dBm0
Signal to total Distortion vs. input
level.
ITU-T G.714 Method 2
DQX
35
29
24
dB
dB
dB
0 to -30 dBm0
-40 dBm0
-45 dBm0
5
6
Transmit Idle Channel Noise
NCX
NPX
13
-70.5
16
-69
dBrnC0 µ-Law
dBm0p A-Law
Gain relative to gain at 1020Hz
<50Hz
60Hz
GRX
-25
-30
0.0
0.25
0.25
0.25
0.25
-12.5
-25
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
-45
200Hz
300 - 3000 Hz
3000-3300 Hz
3300 Hz
3400 Hz
4000 Hz
-0.25
-0.9
-0.9
-1.2
-0.2
-0.6
-23
-41
4600 Hz
>4600 Hz
-25
7
8
Absolute Delay
DAX
DDX
360
µs
at frequency of minimum
delay
Group Delay relative to DAX
750
380
130
750
µs
µs
µs
µs
500-600 Hz
600 - 1000 Hz
1000 - 2600 Hz
2600 - 2800 Hz
9
Power Supply Rejection
f=1020 Hz
±100mV peak signal on
VDD
µ-law
PSSR
30
50
dB
† AC Electrical Characteristics are over recommended temperature range & recommended power supply voltages.
‡ Typical figures are at 25 °C and are for design aid only: not guaranteed and not subject to production testing.
* Note: TxINC, refer to Control Register 1, address 00h.
20
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