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| 型號： | ZXCD1000EQ16TC |
| 英文描述： | Consumer IC |
| 中文描述： | 消費性IC |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 1756K |
| 代理商： | ZXCD1000EQ16TC |
5
Audio A/B
Triangle A/B
PWM Comparator
O/P
Audio A/B
Triangle A/B
Comparator O/P
(Duty Cycle = 50%)
O/P
Audio A/B
Triangle A/B
Comparator O/P
(Duty Cycle = 75%)
Audio A/B
Triangle A/B
Comparator O/P
(Duty Cycle = 25%)
Figure 3c.
Figure 3b.
Figure 3d.
Figures 3a,3b,3c and 3d
The audio input Pulse Width Modulates the comparator output.
ISSUE 1 -MARCH 2001
ZXCD1000
Figure 3a.
With no audio input signal applied, the AudioA/B
inputs are biased at the mid-point of the triangular
wave, and the duty cycle at the output of the
comparatorsisnominally50%. As theAudioA/Bsignal
ascends towards the peak level, the crossing points
with the (higher frequency) triangular wave also
ascend. The comparator monitoring these signals
exhibits a corresponding increase in output duty cycle.
Similarly, as the AudioA/B signal descends, the duty
cycleiscorrespondinglyreduced. Thustheaudioinput
Pulse Width Modulates the comparator outputs. This
principle is illustrated in Figures 3a, b, c and d. The
comparator outputs are buffered and used to drive the
OutAandOutBoutputs.Theseinturndrivethespeaker
load(withtheaudioinformationcontainedinthePWM
signal) via the off chip output bridge and single stage
L-C filter network.
The ramp amplitude is approximately 1V. The AudioA,
AudioB, TriangleA and TriangleB inputs are internally
biased to a DC voltage of approximately VCC/5. The
mid - point DC level of the OscA and OscB triangular
outputs is around 2V. The triangular wave at the Cosc
pin traverses between about 2.7Vand 3.8V and the dist
pin exhibits a roughly square wave from about 1.4V to
2V. (The above voltages may vary in practice and are
included for guidance only).
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