MC44C404 FREESCALE [Freescale Semiconductor, Inc], MC44C404 Datasheet - Page 5

• Manufacturer Part Number: MC44C404
• Description: Stereo Encoder
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Table 7. AC Characteristics
Freescale Semiconductor
DESIGN CONSIDERATIONS
NICAM Stereo Encoder, the user can significantly improve
performance by following the suggestions below.
1.
2.
Input Impedance (A/B Input)
QPSK Audio Output Level
QPSK Output Level
Signal to Noise Ratio
Total Harmonic Distortion
-1 dB Bandwidth
1. Unless other wise noted: DV
1. Unless other wise noted: DV
2. Test conditions, mono, 1 kHz @ 1.5 V
3. Measured in 20 Hz to 13.5 kHz bandwidth
When developing an application using the MC44C404
There must be a notch in the video because video
spectra that fall into the audio range will severely impact
the audio performance.
A band pass filter is required on the QPSK output.
Characteristic
(2),(3)
(2),(3)
(2)
DD
DD
(1)
(Test setup as shown in Figure 3, MC44C404 Typical Application Circuit for B, G and H Systems)
= 1.8 + 0.18 Vdc, OV
= 1.8 + 0.18 Vdc, OV
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SYSTEM APPLICATION NOTES
Symbol
DD
DD
SNR
THD
BW
R
= ADCV
= ADCV
in
DD
DD
= 3.3 + 0.33 Vdc, GND = 0 Vdc, 0 < T
= 3.3 + 0.33 Vdc, GND = 0 Vdc, 0 < T
Modulator Interface
3.
4.
Min
72
20
—
—
—
—
The 4 MHz clock drive to the MC44BS373 must be
filtered and the level set correctly. This can be achieved
by using a Low Pass Filter (LPF), as shown in LPF1 in
Figure 3, MC44C404 Typical Application Circuit for B, G
and H Systems.
To set the application control bits see Table 1, Pin
Descriptions (Listed by Function) and Table 2,
Application Control Bits
0.85
Typ
0.1
22
75
—
—
A
A
< 70°C
< 70°C
14500
Max
2.2
0.3
—
—
—
MC44C404
Units
V
V
KΩ
dB
Hz
%
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