參數(shù)資料
型號(hào)： LTC6905HS5
廠商： LINEAR TECHNOLOGY CORP
元件分類： XO, clock
英文描述： 17MHz to 170MHz Resistor Set SOT-23 Oscillator
中文描述： PLL FREQUENCY SYNTHESIZER, PDSO5
封裝： PLASTIC, SOT-23, 5 PIN
文件頁數(shù)： 5/8頁
文件大?。?/td> 119K
代理商： LTC6905HS5
LTC6905
5
6905fa
BLOCK DIAGRA
THEORY OF OPERATIOU
As shown in the Block Diagram, the LTC6905’s master
oscillator is controlled by the ratio of the voltage between
the V
+
and SET pins and the current entering the SET pin
(I
RES
). The voltage on the SET pin is forced to approxi-
mately 1V below V
+
by the PMOS transistor and its gate
bias voltage.
A resistor R
SET
, connected between the V
+
and SET pins,
“l(fā)ocks together” the voltage (V
+
– V
SET
) and current, I
RES
,
variation. This provides the LTC6905’s high precision. The
master oscillation frequency reduces to:
f
MHz
R
SET
k
MHz
MO
=
+
168 5
10
1 5
.
.
To extend the output frequency range, the master oscilla-
tor signal is divided by 1, 2 or 4 before driving OUT (Pin
5). The LTC6905 is optimized for use with resistors
between 10k and 25k, corresponding to oscillator fre-
quencies between 17.225MHz and 170MHz. The divide-
by value is determined by the state of the DIV input
(Pin 4). Tie DIV to V
+
or drive it to within 0.4V of V
+
to
select
÷
1. This is the highest frequency range, with the
Figure 1. R
SET
vs Output Frequency
master output frequency passed directly to OUT. The DIV
pin may be floated or driven to midsupply to select
÷
2, the
intermediate frequency range. The lowest frequency range,
÷
4, is selected by tying DIV to GND or driving it below
0.5V. Figure 1 shows the relationship between R
SET
,
divider setting and output frequency, including the over-
lapping frequencies.
OUTPUT FREQUENCY (MHz)
10
R
S
)
15
20
÷
4
÷
2
÷
1
6905 F01
10
5
60
110
160
30
25
–
+
–
+
+
1
3
GAIN = 1
V
+
V
BIAS
I
RES
I
RES
R
SET
SET
GND
MASTER OSCILLATOR
PROGRAMMABLE
DIVIDER
(
÷
1, 2 OR 4)
V
RES
= 1V
±
5%
+
– V
SET
)
THREE-STATE
INPUT DETECT
GND
V
+
15
μ
A
6905 BD
15
μ
A
OUT
DIVIDER
SELECT
5
DIV
4
2
f
OSC
= f
MO
N
相關(guān)PDF資料
PDF描述
LTC6905IS5 17MHz to 170MHz Resistor Set SOT-23 Oscillator
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LTC6905CS5 17MHz to 170MHz Resistor Set SOT-23 Oscillator
LTC690 Microprocessor Supervisory Circuits(μP監(jiān)控電路)
LTC6911CMS-1 Dual Matched Amplifiers with Digitally Programmable Gain in MSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC6905HS5#PBF 制造商:Linear Technology 功能描述:SC-Timing, Cut Tape 17MHz to 170MHz Resistor Programmable Oscillator
LTC6905HS5#TRMPBF 功能描述:IC OSC SILICON 170MHZ TSOT23-5 RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝
LTC6905HS5#TRPBF 功能描述:IC OSC SILICON 170MHZ TSOT23-5 RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝
LTC6905HS5-100 制造商:Linear Technology 功能描述:FIXED FREQUENCY SOT-23 OSCILLATOR
LTC6905HS5-100#TRMPBF 功能描述:IC OSC SILICON 100MHZ TSOT23-5 RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝
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