參數(shù)資料
型號(hào)： LM4040CIM7X-5.0
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Precision Micropower Shunt Voltage Reference
中文描述： 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO5
封裝： SC-70, 5 PIN
文件頁(yè)數(shù)： 25/39頁(yè)
文件大?。?/td> 482K
代理商： LM4040CIM7X-5.0
www.ti.com
APPLICATION INFORMATION
Start-Up Characteristics
1-Hz Rate
V
Z
LM4040
R
S
V
IN
Output Capacitor
The LM4040 does not require an output capacitor across cathode and anode for stability. However, if an output
bypass capacitor is desired, the LM4040 is designed to be stable with all capacitive loads.
SOT-23 Connections
There is a parasitic Schottky diode connected between pins 2 and 3 of the SOT-23 packaged device. Thus, pin 3
of the SOT-23 package must be left floating or connected to pin 2.
Use With ADCs or DACs
The LM4040x-41 is designed to be a cost-effective voltage reference as required in 12-bit data-acquisition
systems. For 12-bit systems operating from 5-V supplies such as the ADS7842 (see
Figure 8
), the LM4040x-41
(4.096 V) permits operation with an LSB of 1 mV.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V
REF
AIN0
AIN1
AIN2
AGND
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DGND
AIN3
V
ANA
2.2
μ
F
A1
A0
CLK
DB0
DB1
DB2
DB3
DB4
V
DIG
BUSY
WR
CS
RD
3.2-MHz Clock
BUSY Output
Write Input
Read Input
5-V Analog Supply
10
μ
F
+
+
+
0.1
μ
F
ADS7842
LM4040A-41
909
0 V to V
REF
5 V
LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
SLOS456I–JANUARY 2005–REVISED DECEMBER 2005
Figure 7. Test Circuit
Figure 8. Data-Acquisition Circuit With LM4040x-41
25
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