- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄376452 > XR8038 (Exar Corporation) Precision Waveform Generator PDF資料下載
參數(shù)資料
| 型號(hào)： | XR8038 |
| 廠商： | Exar Corporation |
| 英文描述： | Precision Waveform Generator |
| 中文描述： | 精密波形發(fā)生器 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大小： | 150K |
| 代理商： | XR8038 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)當(dāng)前第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
XR-8038A
7
Rev. 2.01
10K
40K
7
8
Buffer
Buffer
4
SWITCH S
10
5
C
11
11
I
A
R
A
R
B
R
2
R
1
V
CC
V
EE
V
CC
2I
B
Figure 3. Detailed View of Current Sources I
A
and 2I
B
.
WAVEFORM ADJUSTMENT
The symmetry of all waveforms can be adjusted with the
external timing resistors. Two possible ways to
accomplish this are shown in
Figure 4 Figure 5, and
Figure 6. Best results are obtained by keeping the timing
resistors R
A
and R
B
separate (Figure 4.) R
A
controls the
rising portion of the triangle and sine wave and the “l(fā)ow”
state of the square wave.
The magnitude of the triangle waveform is set at 1/3 V
CC
;
therefore, the duration of the rising proportion of the
triangle is:
t
1
C| V|
I
A
C|
2
3
V
CC
-
1
VCC
5RA
3
V
CC
|
5
A
·C
The duration of the falling portion of the triangle and sine
wave and the ”low” state of the square wave is:
t
2
C| V|
2I
B
-I
A
C|
2
3
V
CC
-
1
2VCC
5RB
-
3
V
CC
|
VCC
5RA
5
3·2R
A
R
B
C
A
-R
B
Thus a 50% duty cycle is achieved when R
A
= R
B
If the duty-cycle is to be varied over a small range about
50%, the connection shown in Figure 5 is slightly more
convenient. If no adjustment of the duty cycle is desired,
pins 4 and 5 can be shorted together, as shown in
Figure 6. This connection, however, carries an inherently
larger variation of the duty cycle.
With two separate timing resistors the frequency is given
by:
f
1
t
1
t
2
1
5
3
·R
A
C 1
RB
2RA–RB
or, if R
A
= R
B
= R
f
0.3
RC
(for Figure 4. )
If a single timing resistor is used (Figure 5and Figure 6),
the frequency is:
f
0.15
RC
The frequency of oscillation is independent of supply
voltage, even though none of the voltages are regulated
inside the integrated circuit. This is due to the fact that
both currents and thresholds are direct, linear function of
the supply voltage and thus their effects cancel.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR-8038ACP | Precision Waveform Generator |
| XR-88C681 | () |
| XR-L567 | Micropower Tone Decoder |
| XR-T3588CP | V.35 Interface Receiver/Transmitter |
| XR-T3589 | V.35 Interface Receiver/Transmitter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR-8038A | 制造商:EXAR 制造商全稱:EXAR 功能描述:Precision Waveform Generator |
| XR-8038ACN | 制造商:EXAR 制造商全稱:EXAR 功能描述:Precision Waveform Generator |
| XR8038ACP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
| XR-8038ACP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Precision Waveform Generator |
| XR8038ACP | 制造商:Exar Corporation 功能描述:IC WAVEFORM GENERATOR 8038 DIP14 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。