- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378285 > ADC78H89EVAL (National Semiconductor Corporation) 7-Channel, 500 KSPS, 12-Bit A/D Converter PDF資料下載
參數(shù)資料
| 型號： | ADC78H89EVAL |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 7-Channel, 500 KSPS, 12-Bit A/D Converter |
| 中文描述： | 7通道，500 kSPS的，12位A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 828K |
| 代理商： | ADC78H89EVAL |
Applications Information
(Continued)
TABLE 1. Control Register Bits
Bit 7 (MSB)
DONTC
Bit 6
DONTC
Bit 5
ADD2
Bit 4
ADD1
Bit 3
ADD0
Bit 2
DONTC
Bit 1
DONTC
Bit 0
DONTC
Control Register Bit Descriptions
Bit #:
7, 6, 2, 1, 0
5
4
3
Symbol:
DONTC
ADD2
ADD1
ADD0
Description
Don’t care. The value of this bit does not affect the device.
These three bits determine which input channel will be sampled and
converted on the next falling edge of CS. The mapping between codes and
channels is shown in
Table 2
.
TABLE 2. Input Channel Selection
ADD2
ADD1
ADD0
Input Channel
AIN1 (Default)
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
GND
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
2.0 ADC78H89 OPERATION
The ADC78H89 is a successive-approximation analog-to-
digital converter designed around a charge-redistribution
digital-to-analog converter. Simplified schematics of the
ADC78H89 in both track and hold modes are shown in
Figure 2
and
Figure 3
, respectively. In
Figure 2
, the
ADC78H89 is in track mode: switch SW1 connects the sam-
pling capacitor to one of seven analog input channels
through the multiplexer, and SW2 balances the comparator
inputs. TheADC78H89 is in this state for the first three SCLK
cycles after CS is brought low.
The user does not need to worry about any kind of power-up
delays or dummy conversions with the ADC78H89. The part
is able to acquire input to full resolution in the first conversion
immediately following power-up. The first conversion after
power up will be that of the first channel.
Figure 3
shows the ADC78H89 in hold mode: switch SW1
connects the sampling capacitor to ground, maintaining the
sampled voltage, and switch SW2 unbalances the compara-
tor. The control logic then instructs the charge-redistribution
DAC to add or subtract fixed amounts of charge from the
sampling capacitor until the comparator is balanced. When
the comparator is balanced, the digital word supplied to the
DAC is the digital representation of the analog input voltage.
The ADC78H89 is in this state for the last thirteen SCLK
cycles after CS is brought low.
20061609
FIGURE 2. ADC78H89 in Track Mode
20061610
FIGURE 3. ADC78H89 in Hold Mode
A
www.national.com
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADC78H89 | 7 CHANNEL 500KSPS, 12 BIT A/D CONVERTER |
| ADC78H89CIMT | 7 CHANNEL 500KSPS, 12 BIT A/D CONVERTER |
| ADC78H89CIMTX | 7 CHANNEL 500KSPS, 12 BIT A/D CONVERTER |
| ADC78H90 | 8-Channel, 500 kSPS, 12-Bit A/D Converter |
| ADC78H90CIMT | 8-Channel, 500 kSPS, 12-Bit A/D Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC78H90 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Channel, 500 kSPS, 12-Bit A/D Converter |
| ADC78H90CIMT | 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 |
| ADC78H90CIMT | 制造商:Texas Instruments 功能描述:12BIT ADC 500KSPS POWERWISE TSSOP16 |
| ADC78H90CIMT/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8CH,500KSPS,12B 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 |
| ADC78H90CIMTX | 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)。