- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44573 > LMP90077MH/NOPB (NATIONAL SEMICONDUCTOR CORP) SPECIALTY ANALOG CIRCUIT, PDSO28 PDF資料下載
參數(shù)資料
| 型號： | LMP90077MH/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | LEAD FREE, PLASTIC, MO-153, TSSOP-28 |
| 文件頁數(shù)： | 15/62頁 |
| 文件大小： | 1721K |
| 代理商： | LMP90077MH/NOPB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當(dāng)前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁
16.1.3 Selectable Gains (FGA & PGA)
LMP900xx provides two types of gain amplifiers: a fixed gain
amplifier (FGA) and a programmable gain amplifier (PGA).
FGA has a fixed gain of 16x or it can be bypassed, while the
PGA has programmable gain settings of 1x, 2x, 4x, or 8x.
Total gain is defined as FGA x PGA. Thus, LMP900xx pro-
vides gain settings of 1x, 2x, 4x, 8x, 16x, 32x, 64x, or 128x
with true continuous background calibration.
The gain is channel specific, which means that one channel
can have one gain, while another channel can have the same
or a different gain.
The gain can be selected by programming the CHx_CONFIG:
GAIN_SEL bits.
16.1.4 Buffer (BUFF)
There is an internal unity gain buffer that can be included or
excluded from the signal path. Including the buffer provides a
high input impedance but increases the power consumption.
When gain
≥ 16, the buffer is automatically included in the
signal path. When gain < 16, including or excluding the buffer
from the signal path can be done by programming the
CHX_CONFIG: BUF_EN bit.
16.1.5 Internal/External CLK Selection
LMP900xx allows two clock options: internal CLK or external
CLK (crystal (XTAL) or clock source).
There is an “External Clock Detection” mode, which detects
the external XTAL if it is connected to XOUT and XIN. When
operating in this mode, the LMP900xx shuts off the internal
clock to reduce power consumption. Below is a flow chart to
help set the appropriate clock registers.
30169778
FIGURE 4. CLK Register Settings
The recommended value for the external CLK is discussed in
the next sections.
16.1.6 Programmable ODRs
If using the internal CLK or external CLK of 3.5717 MHz, then
the output date rates (ODR) can be selected (using the
ODR_SEL bit) as:
1. 13.42/8 = 1.6775 SPS
2. 13.42/4 = 3.355 SPS
3. 13.42/2 = 6.71SPS
4. 13.42 SPS
5. 214.65/8 = 26.83125 SPS
6. 214.65/4 = 53.6625 SPS
7. 214.65/2 = 107.325 SPS
8. 214.65 SPS (default)
If the internal CLK is not being used and the external CLK is
not 3.5717 MHz, then the ODR will be different. If this is the
case, use the equation below to calculate the new ODR val-
ues.
ODR_Base1 = (CLK
EXT) / (266,240)
ODR_Base2 = (CLK
EXT) / (16,640)
ODR1 = (ODR_Base1) / n, where n = 1,2,4,8
ODR2 = (ODR_Base2) / n, where n = 1,2,4,8
For example, a 3.6864 MHz XTAL or external clock has the
following ODR values:
ODR_Base1 = (3.6864 MHz) / (266,240) = 13.85 SPS
ODR_Base2 = (3.6864 MHz) / (16,640) = 221.54 SPS
ODR1 = (13.85 SPS) / n = 13.85, 6.92, 3.46, 1.73 SPS
ODR2 = (221.54 SPS) / n = 221.54, 110.77, 55.38, 27.69 SPS
www.national.com
22
LMP90080/LMP90079/LMP90078/LMP90077
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMP90080MHX/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| LMP90078MH/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| LMP90079MH/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| LMP90079MHE/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| LMP90078MHX/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMP90077MHX/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90078 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sensor AFE System: Multi-Channel, Low-Power 16-Bit |
| LMP90078MH/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90078MHE/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90078MHX/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。