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參數(shù)資料
| 型號： | XR-2207 |
| 廠商： | Exar Corporation |
| 英文描述： | Voltage-Controlled Oscillator |
| 中文描述： | 壓控振蕩器 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 248K |
| 代理商： | XR-2207 |
XR-2207
17
Rev. 2.02
Figure 19. Output Waveforms
C. Frequency Shift Keyed Outputs
B. Pulse and Sawtooth Outputs
A. Squarewave and Triangle Outputs
On-Off Keying
The XR-2207 can be keyed on and off by simply activating
an open circuited timing pin. Under certain conditions, the
circuit may exhibit very low frequency (<1Hz) residual
oscillations in the “off” state due to internal bias currents. If
this effect is undesirable, it can be eliminated by
connecting a 10M
resistor from pin 3 to V
CC
.
Two-Channel FSK Generator (Modem Transmitter)
The multi-level frequency shift-keying capability of
XR-2207 makes it ideally suited for two-channel FSK
generation. A recommended circuit connection for this
application is shown in Figure 20
For two-channel FSK generation, the “mark” and “space”
frequencies of the respective channels are determined by
the timing resistor pairs (R
1
, R
2
) and (R
3
, R
4
). Pin 8 is the
“channel-select” control in accord with Figure 11 For a
“high” logic level at pin 8, the timing resistors R
1
and R
2
are activated. Similarly, for a “l(fā)ow” logic level, timing
resistors R
3
and R
4
are enabled.
The “high” and “l(fā)ow” logic levels at pin 9 determine the
respective high and low frequencies within the selected
FSK channel. When only a single FSK channel is used,
the remaining channel can be deactivated by connecting
pin 8 to either V
CC
or ground. In this case, the unused
timing resistors can also be omitted from the circuit.
The low and high frequencies, f
1
and f
2
, for a given FSK
channel can be fine tuned using potentiometers
connected in series with respective timing resistors. In
fine tuning the frequencies, f
1
should be set first with the
logic level at pin 9 in a “l(fā)ow” level.
Typical frequency drift of the circuit for 0
°
C to 75
°
C
operation is
0.2%. Since the frequency stability is
directly related to the external timing components, care
must be taken to use timing components with low
temperature coefficients.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR-2207CP | Voltage-Controlled Oscillator |
| XR-2207D | Voltage-Controlled Oscillator |
| XR-2207M | Voltage-Controlled Oscillator |
| XR-2207ID | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PTB; No. of Contacts:18; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Thru-Bulkhead Receptacle |
| XR-2208 | OPERATIONAL MULTIPLIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR2207CN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Waveform Generator/Support |
| XR-2207CP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR-2207D | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR-2207ID | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR-2207M | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
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