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参数资料
| 型号： | LM12438CIWMX |
| 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： | SOP-28 |
| 文件页数： | 16/80页 |
| 文件大小： | 1552K |
| 代理商： | LM12438CIWMX |
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50 Pin Descriptions
TABLE I LM12 L 438 Pin Description
Pin Number
Pin Name
Description
PLCC
SO
Pkg
1
7
DGND
Digital ground This is the device’s digital supply ground connection It should be connected
through a low resistance and low inductance ground return to the system power supply
2
8
IN0
These are the eight analog inputs to the multiplexer For each conversion to be performed the
3
9
IN1
active channels are selected according to the instruction RAM programming Any individual
4
10
IN2
channel can be selected for a single-ended conversion referenced to AGND or any pair of
5
11
IN3
channels whether adjacent or non adjacent can be selected as a fully differential input pairs
6
12
IN4
7
13
IN5
8
14
IN6
9
15
IN7
10
16
VREFa
Positive reference input The operating voltage range for this input is 1V s VREFa s VAa (See
Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be by passed to AGND
at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The capacitors
should be placed as close to the part as possible
11
17
VREFb
Negative reference input The operating voltage range for this input is 0 V s VREFb s VREFa
b
1V (See
Figures 3 and 4 ) In order to achieve 12-bit performance this pin should be bypassed
to AGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic) capacitor The
capacitors should be placed as close to the part as possible
12
18
AGND
Analog ground This is the device’s analog supply ground connection It should be connected
through a low resistance and low inductance ground return to the system power supply
13
19
VAa
Analog supply This is the supply connection for the analog circuitry The device operating supply
voltage range is a30V to a55V Accuracy is guaranteed only if the VAa and VDa are
connected to the same potential In order to achieve 12-bit performance this pin should be
bypassed to AGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic)
capacitor The capacitors should be placed as close to the part as possible
14
20
DGND
Digital ground See above definition
15
21
VDa
Digital supply This is the supply connection for the analog circuitry The device operating supply
16
22
voltage range is a30V to a55V The device accuracy is guaranteed only if the VAa and VDa
are connected to the same potential In order to achieve 12-bit performance this pin should be
by passed to DGND at least with a parallel combination of a 10 mF and a 01 mF (ceramic)
capacitor The capacitors should be placed as close to the part as possible
17
23
P5
P1 – P5 are the multi-function serial interface input or output pins that have different assignments
depending on the selected mode
Serial interface input
Standard
SCLK
8051
TXD
I2C
SCL
TMS320
DR
18
24
P4
Serial interface inputoutput
Standard
DO
8051
RXD
I2C
SDA
TMS320
DR
19
25
P3
Serial interface input
Standard
DI
8051
CS
I2C
SAD2
TMS320
DX
23
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