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參數(shù)資料
| 型號： | Q67220-H1059 |
| 廠商： | SIEMENS AG |
| 英文描述： | ISDN DC Converter Circuit IDCC |
| 中文描述： | 綜合業(yè)務(wù)數(shù)字網(wǎng)DC轉(zhuǎn)換器電路IDCC |
| 文件頁數(shù)： | 18/25頁 |
| 文件大小： | 145K |
| 代理商： | Q67220-H1059 |
PEB 2023
PEF 2023
Functional Description
Semiconductor Group
18
08.97
Voltage Reference
The reference regulator of the PEB/F 2023 is based on a temperature compensated
bandgap. This circuitry is fully active at supply voltages (pin V
EXT
) above 6 volts and
provides up to 0.5mA of load current to external circuitry at 4 volts. This reference has to
be buffered by an external capacitor (C
min
= 1
μ
F).
Sawtooth Oscillator
The oscilator frequency is programmed by the two components R
1
and C
1
(see figure 4,
5 or 6). The oscillator timing capacitor C
1
is charged by V
REF
through R
1
and discharged
by an internal 10k
discharge-resistor. The rise-time of the sawtooth oscillator can be
programmed with R
1
and C
1
. The internal discharge-resistor and C
1
define the fall-time.
At the beginning of the discharge period a positive synchronization pulse is generated at
pin SYNC. Otherwise the PEB/F 2023 can be synchronized via pin SYNC to an external
logic clock by programming the oscillator to free run at a frequency 10% lower than the
synchronization frequency. The PEB/F 2023 is synchronized by the rising edge of the
sync. signal. So multiple devices can be synchronized together by programming one
master unit for the desired frequency (only one possible interfering frequency).
Note that the frequency of the output driver is half the oscillator frequency. The switching
frequency as a function of R
1
and C
1
is shown in
figure 9
.
Figure 9
Switching Frequency
0
50
100
150
200
250
300
350
10
20
30
40
50
60
70
80
90
100
R [ kOHM ]
f
10 pF
22 pF
68 pF
100 pF
220 pF
470 pF
1 nF
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