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參數資料
| 型號： | ADC12138CIN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP28 |
| 封裝： | DIP-28 |
| 文件頁數： | 36/41頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | ADC12138CIN |
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Application Hints
(Continued)
The assignment of the RS232 port is shown below
B7
X
X
B6
X
X
B5
X
X
B4
CTS
0
B3
X
X
B2
X
X
B1
X
RTS
B0
X
DTR
COM1
Input Address
Output Address
3FE
3FC
A sample program, written in Microsoft QuickBasic, is shown
on the next page. The program prompts for data mode select
instruction to be sent to the A/D. This can be found from the
Mode Programming table shown earlier. The data should be
entered in “1”s and “0”s as shown in the table with DI0 first.
Next the program prompts for the number of SCLKs required
for the programmed mode select instruction. For instance, to
send all “0”s to the A/D, selects CH0 as the +input, CH1 as
the input, 12-bit conversion, and 13-bit MSB first data out-
put format (if the sign bit was not turned off by a previous in-
struction). This would require 13 SCLK periods since the out-
put data format is 13 bits. The part powers up with No Auto
Cal, No Auto Zero, 10 CCLK Acquisition Time, 12-bit conver-
sion, data out with sign, power up, 12- or 13-bit MSB First,
and user mode. Auto Cal, Auto Zero, Power Up and Power
Down instructions do not change these default settings.
Since there is no CS signal to synchronize the serial inter-
face the following power up sequence should be followed:
1.
Run the program
2.
Prior to responding to the prompt apply the power to the
ADC12138
3.
Respond to the program prompts
It is recommended that the first instruction issued to the
ADC12138 be Auto Cal (see Section 1.1).
Code Listing:
’variables DOL=Data Out word length, DI=Data string for A/D DI input,
’
DO=A/D result string
’SET CS# HIGH
OUT <&>H3FC, (<&>H2 OR INP (<&>H3FC)
HIGH
OUT <&>H3FC, (<&>HFE AND INP(<&>H3FC)
OUT <&>H3FC, (<&>HFD AND INP (<&>H3FC)
OUT <&>H3FC, (<&>HEF AND INP(<&>H3FC))
10
LINE INPUT <&ldquo>DI data for ADC12138 (see Mode Table on data sheet)<&rdquo>; DI$
INPUT <&ldquo>ADC12138 output word length (12,13,16 or 17)<&rdquo>; DOL
20
’SET CS# HIGH
OUT <&>H3FC, (<&>H2 OR INP (<&>H3FC)
HIGH
OUT <&>H3FC, (<&>HFE AND INP(<&>H3FC)
OUT <&>H3FC, (<&>HFD AND INP (<&>H3FC)
’set RTS
’SET DTR LOW
’SET RTS LOW
’set B4 low
’set RTS
’SET DTR LOW
’SET RTS LOW
DS012079-46
Note:
V
A+
, V
D+
, and V
REF+
on the ADC12138 each have 0.01 μF and 0.1 μF chip caps, and 10 μF tantalum caps. All logic devices are bypassed with 0.1 μF
caps.
A
www.national.com
36
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| ADC12138CIN | 制造商:Texas Instruments 功能描述:IC 12BIT ADC 12138 DIP28 |
| ADC12138CIN/NOPB | 功能描述:IC ADC 12BIT SELF-CALIB 28-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| ADC12138CIWM | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC12138CIWM/NOPB | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC12138CIWMX | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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