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參數(shù)資料
| 型號(hào)： | LTC6905MPS5#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, PDSO5 |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 166K |
| 代理商： | LTC6905MPS5#TRM |
LTC6905
10
6905fd
ALTERNATIVE METHODS OF SETTING THE OUTPUT
FREQUENCY OF THE LTC6905
The LTC6905 may be programmed by any method that
sources a current into the SET pin (Pin 3). The accuracy
of the programming is best with a simple resistor because
the LTC6905 takes into account both the voltage at the SET
pin and the current into the SET pin when generating the
output frequency. Since the voltage at the SET pin can
vary by as much as 5%, setting the frequency using a
current rather than a resistor will result in as much as 5%
additional inaccuracy in the output frequency.
APPLICATIONS INFORMATION
Figure 3 shows a method to control the frequency of the
LTC6905 using a current source. RSET, in this case, sets a
maximum frequency according to the regular expression
for fOSC. The current source will subtract current from the
SET pin to lower the frequency.
Figure 4 shows a method for controlling the frequency
of the LTC6905 using a voltage source. In this case, RSET
sets a constant current into the SET pin, and RCNTRL will
subtract from this current in order to change the frequency.
Increasing VCNTRL will increase the output frequency.
f
N
MHz
k
VV
R
I
OSC
SET
CNTRL
=
Ω
+
1
168 5
10
.
–
+
+
VV
MHz
SET
–
.
15
ICNTRL Frequency ≤ 100kHz
Example (Figure 3): VSET = (V+ – 1V), RSET = 10k, N = 1
fOSC = [168.5MHz (1 – 10kΩ ICNTRL) + 1.5MHz
f
N
MHz
k
VV
R
VV
OSC
SET
CNTR
=
Ω
+
1
168 5
10
.
–
L
CNTRL
SET
R
VV
MHz
+
+ –
.
15
VCNTRL Frequency ≤ 100kHz
Example (Figure 4): VSET = (V+ – 1V), RSET = 10k, RCNTRL = 33.2k,
N = 1, V+ = 3V
fMHz
k
VV
k
OSC
CNTRL
=
Ω
ΩΩ
168 5
10
1
10
2
33 2
.
–
.
+
15
.MHz
V+
1
2
3
5
fOSC
69.8MHz TO 170MHz
V+
0.1μF
ICNTRL
0μA TO 60μA
RSET
10k
6905 F03
4
GND
V+
N = 1
LTC6905
SET
OUT
DIV
Figure 3. Current Controlled Oscillator
V+
1
2
3
5
V+ = 3V
0.1μF
RSET
10k
VCNTRL
0V TO 2V
6905 F04
4
GND
V+
N = 1
LTC6905
SET
OUT
DIV
+
–
RCNTRL
33.2k
fOSC
69.8MHz TO 170MHz
Figure 4. Voltage Controlled Oscillator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6905-XXX | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Fixed Frequency SOT-23 Oscillator |
| LTC6906 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| LTC6906CS6 | 制造商:Linear Technology 功能描述:MICROPOWER, 10KHZ TO 1MHZRESISTOR SET OSCILLATORIN SOT-23 |
| LTC6906CS6#PBF | 制造商:Linear Technology 功能描述:MICROPOWER, 10KHZ TO 1MHZRESISTOR SET OSCILLATORIN SOT-23 制造商:Linear Technology 功能描述:IC PROG OSC 1MHZ 5.5V TSOT-23-6 制造商:Linear Technology 功能描述:IC, PROG OSC, 1MHZ, 5.5V, TSOT-23-6 制造商:Linear Technology 功能描述:IC, PROG OSC, 1MHZ, 5.5V, TSOT-23-6; Operating Mode:-; Frequency:1MHz; Supply Voltage Min:2.25V; Supply Voltage Max:5.5V; Digital IC Case Style:TSOT-23; No. of Pins:6; Clock External Input:-; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC6906CS6#TR | 制造商:Linear Technology 功能描述:MICROPOWER, 10KHZ TO 1MHZRESISTOR SET OSCILLATORIN SOT-23 制造商:Linear Technology 功能描述:Silicon Oscillator 6-Pin TSOT-23 T/R |
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