參數資料
型號： ADS8422IBPFBR
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48
封裝： 9 X 9 MM, GREEN, PLASTIC, TQFP-48
文件頁數： 27/28頁
文件大小： 1310K
代理商： ADS8422IBPFBR
www.ti.com
TYPICAL CHARACTERISTICS
68
14024
13025
93
234937
0
50000
100000
150000
200000
250000
FFFD
FFFE
FFFF
0000
0001
Code-Hex
COUNTS
+VA =5V,
+VAREG=3V,
+VBD=3V,
IntREFIN=4.096V,
262144Points,
Sigma=0.325,
78
13793
235679
12575
19
0
50000
100000
150000
200000
250000
FFFD
FFFE
FFFF
0000
0001
Code-Hex
COUNTS
+VA =5V,
+VAREG=3V,
+VBD=3V,
ExtREFIN=4.096V,
262144Points,
Sigma=0.319,
4.094
4.095
4.096
4.097
4.098
-40
-25
-10
5
20
35
50
65
80
T -Free-AirTemperature- C
A
REFOUT-InternalReferenceV
oltage-V
D1
D3
D2
+VA =5V,
+VAREG=3V,
+VBD=3V
SLAS512B – JUNE 2006 – REVISED DECEMBER 2006
TERMINAL FUNCTIONS (continued)
NAME
NO
I/O
DESCRIPTION
DB9
22
O
D9
D1
D9
DB8
23
O
D8
D0 (LSB)
D8
DB7
26
O
D7
All ones
D7
DB6
27
O
D6
All ones
D6
DB5
28
O
D5
All ones
D5
DB4
29
O
D4
All ones
D4
DB3
30
O
D3
All ones
D3
DB2
31
O
D2
All ones
D2
DB1
32
O
D1
All ones
D1
DB0
33
O
D0 (LSB)
All ones
D0 (LSB)
–IN
7
I
Inverting input channel
+IN
6
I
Noninverting input channel
NC
11
–
No connection
Low true signal. A logic low longer than 1.5
s applied to this pin powers down only the analog outputs that include
PD2
37
I
REFOUT and COMMOUT. (NOTE: The combination PD1 = 1, PD2 = 0 is reserved. Do not use this combination.)
REFIN
1
I
Reference input. Add 0.1-
F decoupling capacitor between REFIN and REFM.
REFOUT
2
O
Reference output. Add 1-
F capacitor between the REFOUT pin and REFM pin when internal reference is used.
REFM
47, 48
I
Reference ground
Low true signal. A low pulse applied to this pin resets the ADC; the ongoing conversion is aborted. A low pulse shorter
RESET/PD1
38
I
than 0.5
s only resets, and one longer than 1.5 s resets and also powers down the ADC. Note that analog outputs
REFOUT and COMMOUT can be powered down by PD2, if necessary.
RD
41
I
Synchronization pulse for the parallel output.
+VA
4, 46
–
Analog power supplies, 4.75 V to 5.25 VDC
+VAREG
10
–
Regulator supply, 2.85 V to 5.25 VDC
+VBD
24, 34
–
Digital power supply for bus
INTERNAL REFERENCE VOLTAGE
HISTOGRAM OF 262144
vs
CONVERSIONS OF DC INPUT AT
FREE-AIR TEMPERATURE
CENTER CODE (Internal Reference)
CENTER CODE (External Reference)
(Three Devices Shown)
Figure 1.
Figure 2.
Figure 3.
8
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