Delta Modulation CODEC
12
MX629
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
= 5.0V at T = 25°C, Audio Test Frequency = 820Hz Xtal/Clock f = 1.024MHz
3-bit Compand Algorithm, Sample Clock Rate = 32kbps, Audio level 0dB ref (0 dBm0) = 489mV
V
DD
AMB
0
.
RMS
Notes
Min.
Typ.
Max.
Units
Static Values
Supply Voltage
1
4.5
5.0
5.5
400
5.5
V
mA
ꢄA
V
Supply Current (Enabled)
Supply Current (Powersave)
Input logic ‘1’
8
8
3.5
4.0
Input Logic ‘0’
1.5
1.0
V
Output Logic ‘1’
V
Output Logic ‘0’
V
Digital input Impedance
Logic I/O pins
1.0
10
1
Mꢂ
kꢂ
kꢂ
kꢂ
ꢂ
Logic Input pins, Pullup Resistor
Digital output impedance
Analog Input Impedance
Analog Output Impedance
Three State Output Leakage
Insertion Loss
2
300
4
4
7
800
4
-4
-2
ꢄA
dB
3
2
1,9
Dynamic Values
Encoder
Analog signal Input levels
Principal Integrator Frequency
Encoder Passband
Compand Time Constant
Decoder
5, 9
-35
12
dBmO
Hz
127
159
3400
5.0
212
Hz
4.0
6.0
ms
Analog Signal Output Levels
Decoder Passband
Encoder Decoder (Full Codec)
5, 9
-35
12
dBmO
Hz
300
3400
Compression Ration
(Cd = 0.3 to Cd = 0.0)
16:1
Passband
300
4.2
3400
Hz
Stopband
KHz
Stopband Attenuation
4200Hz to 6000Hz
>6000Hz
25
dB
dB
60
0
Passband Gain
dB
Passband Ripple
300Hz – 1400Hz
1400Hz – 2600Hz
2600Hz –3400Hz
Output Noise (Input Short Circuit)
Perfect Idle Channel Noise
(Encode Forced)
-3
-1
-1
-2
3
1
1
3
dB
dB
dB
dB
9
9
-55
-57
dBmO
dBmO
ꢀ1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480190.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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CMLMICRO [ CML MICROCIRCUITS ]
