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參數(shù)資料
| 型號(hào)： | LTC6903 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1kHz - 68MHz Serial Port Programmable Oscillator |
| 中文描述： | 1kHz時(shí)- 68MHz串行接口可編程振蕩器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 195K |
| 代理商： | LTC6903 |
LTC6903/LTC6904
8
69034fa
Output Control
The CLK and CLK outputs of the LTC6903/LTC6904 are
individually controllable through the serial port as
described in Table 2 below. The low power mode may also
be accessed through these control bits. It is preferred that
unused outputs be disabled in order to reduce power
dissipation and improve accuracy.
Disabling an unused output will improve accuracy of
operation at frequencies above 1MHz. An unused output
running with no load typically degrades frequency accu-
racy up to 0.2% at 68MHz. An unused output running into
a 5pF load typically degrades frequency accuracy up to
0.5% at 68MHz.
Table 2. Output Configuration
CNF1
0
0
1
1
CNF0
0
1
0
1
CLK
ON
OFF
ON
CLK
CLK + 180
°
ON
OFF
Powered-Down*
*Powered-Down: When in this mode, the chip is in a low power state and will require approximately 100
μ
s
to recover. This is not the same effect as the OE pin, which is fast, but uses more power supply current.
Serial Port Bitmap (LTC6903/LTC6904)
(All serial port register bits default LOW at power up)
Table 3
D15
OCT3
D14
OCT2
D6
DAC4
D13
OCT1
D5
DAC3
D12
OCT0
D4
DAC2
D11
DAC9
D3
DAC1
D10
DAC8
D2
DAC0
D9
DAC7
D1
CNF1
D8
DAC6
D0
CNF0
D7
DAC5
D15
D14
D13
D12
D11
D10
D8
D9
D7
D6
D5
D4
D3
D2
D1
D0
SEN
SCK
SDI
6903 TD01
APPLICATIU
W
U
U
Additionally, the LTC6903/LTC6904 is guaranteed to be
monotonic when switching between octaves with the OCT
setting bits. For example, the frequency output with a DAC
setting of “1111111111” and an OCT setting of “1100” will
always be lower than the frequency output with a DAC
setting of “0000000000” and an OCT setting of “1101”.
Linearity at these transition points is typically around
3LSBs.
Output Loading and Accuracy
Improper loading of the outputs of the LTC6903/LTC6904,
especially with poor power supply bypassing, will result in
accuracy problems. At low frequencies, capacitive loading
of the output is not a concern. At frequencies above 1MHz,
attention should be paid to minimize the capacitive load on
the CLK and CLK pins.
The LTC6903/LTC6904 is designed to drive up to 5pF on
each output with no degradation in accuracy. 5pF is
equivalent to one to two HC series logic inputs. A standard
10x oscilloscope probe usually presents between 10pF
and 15pF of capacitive load.
It is strongly suggested that a high speed buffer is used
when driving more than one or two logic inputs, when
driving a line more than 5 centimeters in length, or a
capacitive load greater than 5pF.
Timing Diagram (LTC6903)
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| LTC6903_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1kHz to 68MHz Serial Port Programmable Oscillator |
| LTC6903CMS8 | 功能描述:IC OSC SILICON 68MHZ 8-MSOP RoHS:否 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 |
| LTC6903CMS8#PBF | 功能描述:IC OSC SILICON 68MHZ 8-MSOP 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:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 類型:振蕩器 - 晶體 計(jì)數(shù):- 頻率:- 電源電壓:2.3 V ~ 5.5 V 電流 - 電源:1.07mA 工作溫度:-30°C ~ 80°C 封裝/外殼:SOT-665 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:SS迷你型-5D 安裝類型:表面貼裝 其它名稱:AN8955SSMTXLTR |
| LTC6903CMS8#PBF | 制造商:Linear Technology 功能描述:Programmable Oscillator IC |
| LTC6903CMS8#TR | 功能描述:IC OSC SILICON 68MHZ 8-MSOP RoHS:否 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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