Advance Information
MT88E45
AC Electrical Characteristics† - FSK Demodulation
Characteristics
Sym
Min
Typ‡
Max
Units
Notes*
-40
-37.78
10.0
-6.45
-4.23
476
dBV
dBm
mVrms
1
2
Accept Signal Level Range
1, 2, 4, 5
-48.24
-50.46
3
dBm
dBV
mVrms
Bell 202 Format Reject Signal Level
Transmission Rate
1, 2, 4, 5
3
4
1188
1200
1212
baud
Mark and Space Frequencies
Bell 202 1 (Mark)
1188
2178
1200
2200
1212
2222
Hz
Hz
Bell 202 0 (Space)
CCITT V.23 1 (Mark)
CCITT V.23 0 (Space)
1280.5 1300
2068.5 2100
1319.5
2131.5
Hz
Hz
5
6
Twist: 20 log (VMARK/VSPACE
)
-6
+10
dB
dB
Signal to Noise Ratio
SNRFSK
20
1,3
† AC Electrical Characteristics are over recommended operating conditions, unless otherwise stated.
‡ Typical figures are nominal values and are for design aid only: not guaranteed and not subject to production testing.
*Notes:
1. Both mark and space have the same amplitude.
2. Tip/Ring signal level. Input op-amp configured to 0dB gain at Vdd=5V+/-10%, -3.5dB at Vdd=3V+/-10%.
3. Band limited random noise (200-3400Hz). Present when FSK signal is present. Note that the BT band is 300-3400Hz, the Bellcore
band is 0-4kHz.
4. dBV - Decibels above or below a reference voltage of 1 Vrms. 0 dBV = 1 Vrms.
5. dBm - Decibels above or below a reference power of 1 mW into 600 ohms. 0 dBm = 0.7746 Vrms.
Electrical Characteristics† - Gain Setting Amplifiers
Characteristics
Input Leakage Current
Sym
Min
Max
Units
Test Conditions
1
2
3
4
5
6
7
8
9
IIN
Rin
1
µA
MΩ
mV
dB
dB
dB
MHz
V
VSS ≤ VIN ≤ VDD
Input Resistance
10
Input Offset Voltage
VOS
PSRR
CMRR
AVOL
fC
25
Power Supply Rejection Ratio
Common Mode Rejection
DC Open Loop Voltage Gain
Unity Gain Bandwidth
30
40
1kHz ripple on VDD
VCMmin ≤ VIN ≤ VCMmax
40
0.3
0.5
V
DD-0.7
50
Output Voltage Swing
VO
Load ≥ 100kΩ
Capacitive Load (GS1,GS2)
CL
pF
10 Resistive Load (GS1,GS2)
RL
100
1.0
kΩ
V
VDD-1.0
11 Common Mode Range Voltage
VCM
† Electrical characteristics are over recommended operating conditions, unless otherwise stated.
17
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