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参数资料
| 型号： | LM9823CCWM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | 0.300 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 19/22页 |
| 文件大小： | 238K |
| 代理商： | LM9823CCWM/NOPB |
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www.national.com
Note 7: Two diodes clamp the OS analog inputs to AGND and VA as shown below. This input protection, in combination with the external clamp capacitor and the output
impedance of the sensor, prevents damage to the LM9823 from transients during power-up.
Note 8: To guarantee accuracy, it is required that VA and VD be connected to clean, low noise power supplies, with separate bypass capacitors at each supply pin. When
both VA and VD are operated at 5.0V, they must be powered by the same regulator, with separate power planes or traces and separate bypass capacitors at each supply pin.
Note 9: Typicals are at TJ=TA=25°C, fMCLK = 12MHz, and represent most likely parametric norm.
Note 10: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 11: Full channel integral non-linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that best fits the actual transfer
function of the AFE.
Note 12: The sensor’s maximum peak differential signal range is defined as the peak sensor output voltage for a white (full scale) image, with respect to the dark reference
level.
Note 13:
PGA Gain Error is the maximum difference between the measured gain for any PGA code and the ideal gain calculated by using the formula
where
.
Note 14: Full Channel INL and DNL are tested with CDS disabled, negative signal polarity, DOE = 0, and a single OS input with a gain register setting of 1 (000001b) and
an offset register setting of 0 (000000b).
Note 15: The digital supply current (ID) does not include the load, data and switching frequency dependent current required to drive the digital output bus on pins (D7 - D0).
The current required to switch the digital data bus can be calculated from: ISW = 2*ND*PSW*CL*VD/tMCLK where ND is total number of data pins, PSW is the probability of
each data bit switching, CL is the capacitive loading on each data pin, VD is the digital supply voltage and tMCLK is the period of the MCLK input. For most applications, ND
is 8, PSW is ≈ 0.5, and VD is 5V, and the switching current can be calculated from: ISW = 40*CL/tMCLK. (With VD at 3.3V, the equation becomes: ISW = 26.4*CL/tMCLK.) For
example, if the capacitive load on each digital output pin (D7 - D0) is 20pF and the period of tMCLK is 1/12MHz or 83ns, then the digital switching current would be 9.6mA.
The calculated digital switching current will be drawn through the VD pin and should be considered as part of the total power budget for the LM9823.
Note 16: All specifications quoted in LSBs are based on 12 bit resolution.
OS Input
AGND
VA
TO INTERNAL
CIRCUITRY
VWHITE
VREF
VRFT
CCD Output Signal
CIS Output Signal
VWHITE
Black Level
Gain
PGA
V
----
G
0
X
PGA code
32
---------------------------
+
=X
G
31
G
0
–
()32
31
------
=
AC Electrical Characteristics (Continued)
LM
9823
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM9823CCWMX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM9823 3 Channel 48-Bit Color Scanner Analog Front End |
| LM9830 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM9830 36-Bit Color Document Scanner |
| LM9830VJD | 功能描述:视频模拟/数字化转换器集成电路 RoHS:否 制造商:Texas Instruments 输入信号类型:Differential 转换器数量:1 ADC 输入端数量:4 转换速率:3 Gbps 分辨率:8 bit 结构: 输入电压:3.3 V 接口类型:SPI 信噪比: 电压参考: 电源电压-最大:3.45 V 电源电压-最小:3.15 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:TCSP-48 封装:Reel |
| LM9830VJD/NOPB | 功能描述:视频模拟/数字化转换器集成电路 RoHS:否 制造商:Texas Instruments 输入信号类型:Differential 转换器数量:1 ADC 输入端数量:4 转换速率:3 Gbps 分辨率:8 bit 结构: 输入电压:3.3 V 接口类型:SPI 信噪比: 电压参考: 电源电压-最大:3.45 V 电源电压-最小:3.15 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:TCSP-48 封装:Reel |
| LM9830VJDX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM9830 36-Bit Color Document Scanner |
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