CMX649 CML Microcircuits, CMX649 Datasheet - Page 45

• Manufacturer Part Number: CMX649
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
7.1.3 Operating Characteristics
The following conditions are assumed unless otherwise specified: V
+85°C, Audio Test Frequency = 820Hz, Xtal/Clock f
level (0 dBm0) = 489mV
Notes:
DC Parameters
Input logic 1
Input logic 0
Output logic 1
Output logic 0
Digital Output Impedance
Analog Input Impedance
Analog Output Impedance
Three State Output Leakage
DAC Full Scale Reference Voltage
Dynamic Values
Encoder Analog Signal Input Sensitivity
Encoder Input to Decoder Output Insertion
Loss
Encoder/Decoder (Full Codec)
2003 CML Microsystems Plc
I
I
I
I
I
I
Logic I/O Pin Input Impedance
Logic Input Pins, Pull-up Resistor
V
V
V
V
Passband Lowest Corner Frequency
Passband Highest Corner Frequency
Stopband Lowest Corner Frequency
Stopband Highest Corner Frequency
Stopband Attenuation
Passband Gain
Passband Ripple
Output Noise (Input Short Circuit)
Perfect Idle Channel Noise (Encode Forced)
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
(powersaved) at V
(powersaved) at V
(low powermode) at V
(low powermode) at V
(XTAL only) at V
= 3.0V
= 5.0V
= 3.0V
= 5.0V
(XTAL only) at V
1. Not including any current drawn from the device by external circuits.
2. Input and output signal levels are independent of supply voltage.
3. Passband and stopband corner frequencies are programmable. Specified values are at
4. dBmOp units imply the use of a psophometrically weighted filter that is commonly used
5. From 400Hz to 3000Hz with a 3.7kHz bandwidth.
6. At V
nominal crystal frequencies of 4.096, 8.192, 12.288, or 16.384Mhz with the master clock
divider configured for a divide by 1, 2, 3, or 4 respectively. For other crystal frequencies
passband and stopband corner frequencies must be scaled accordingly.
in voice communication applications per ITU Recommendation G.223.
order integration only.
DD
=2.7Vm, data rate = 64kbps, 2.9kHz bandwidth, offsets compensated and 1
DD
DD
RMS
DD
DD
= 5.0V
= 3.0V
.
= 3.0V
= 5.0V
DD
DD
= 3.0V
= 5.0V
45
0
= 4.096MHz, Data Rate = 32kbps, Audio reference
Notes
4,6
4,6
1
1
1
1
1
1
2
2
2
2
3
3
3
3
5
80% V
70%V
Min.
-1.5
300
1.0
-37
-37
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
-
-
-
-
-
-
DD
DD
DD
= 2.7V to 5.5V at T
1.235
Typ.
2900
1400
0.34
0.91
200
1.0
1.0
2.0
3.4
6.0
-61
-62
±4
24
40
–
–
–
–
–
–
–
–
–
–
0
0
0
–
30% V
20%V
Max.
10.0
10.0
200
2.0
2.5
3.8
4.9
4.0
4.0
4.0
3.0
AMB
–
–
–
–
–
–
–
–
–
–
–
-
-
-
-
-
-
DD
DD
= -40 to
Units
µA
µA
mA
mA
mA
mA
V
V
V
V
M
k
k
k
µA
V
dB
dB
dB
dB
Hz
Hz
kHz
kHz
dB
dB
dB
dBmOp
dBmOp
CMX649
D/649/2
st