參數(shù)資料
型號： AS1530-T
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： ADC
英文描述： 12-Bit, 8-Channels ADC 400ksps; Package Type: TSSOP-20
中文描述： 12位，單電源，低功耗，400/300ksps的A / D轉(zhuǎn)換器
封裝： TSSOP-20
文件頁數(shù)： 19/29頁
文件大小： 1087K
代理商： AS1530-T
www.austriamicrosystems.com
Revision 1.02
19 - 29
AS1530/AS1531
Data Sheet
- Detailed Description
Figure 26. Two’s Complement Transfer Function for
RANGE = 1 and MODE = 0
Figure 27. Two’s Complement Transfer Function for
RANGE = 0 and MODE = 0
Power Modes
Power consumption can be reduced by placing the AS1530/AS1531 in reduced power mode or in full power-down
mode between conversions.
The power mode is selected using bits PD1 and PD0 of the 8-bit control byte.
Table 12
lists the three operating modes with the corresponding supply current and active device circuits. For data
rates achievable in full power-down mode see
Full Power-Down Mode on page 20
.
*
Circuit operation between conversions; during conversion all circuits are fully powered up.
The selected power-down mode (as shown in
Table 12
) is initiated after an analog-to-digital conversion is completed.
In all power modes the serial interface remains active, waiting for a new control byte to start conversion (see
Figure 30
on page 21
). Once the conversion is completed, the AS1530/AS1531 goes into the selected power mode until a new
control byte is shifted in. In reduced power mode the AS1530/AS1531 will be able to start conversion immediately
when running at decreased clock rates. In full power down mode wait until the internal reference has stabilized (depen-
dant on the values of the capacitance of REF and REFADJ).
During initialization the AS1530/AS1531 immediately go into normal operation mode and are ready to convert after 4μs
when using an external reference. When using the internal reference, wait until the internal reference has stabilized
(dependant on the values of the capacitance of REF and REFADJ).
Table 12. Software Controlled Power Modes
PD1/PD0
(page 23)
Mode
Total Supply Current
Device Circuits
*
During Conversion
AS1530
2.8mA
After Conversion
AS1530
0.5μA
Input
Comparator
Reference
AS1531
2.2mA
AS1531
0.5μA
00
01
10
11
Full Power-Down Mode
Off
Off
Reduced-Power Mode
2.8mA
2.2mA
0.4mA
0.4mA
Reduced
Power
On
Normal Operation
2.8mA
2.2mA
2.0mA
1.8mA
Full Power
On
011....111
011...110
000...010
000...001
000...000
111...111
111...110
111...101
100...001
100...000
O
-FS
ZS
Input Voltage AIN+ - AIN- (LSB)
+FS - 1LSB
Full Scale = V
REF
-Full Scale = 0
Zero Scale = V
REF
/2
1LSB = V
REF
/4096
011....111
011...110
000...010
000...001
000...000
111...111
111...110
111...101
100...001
100...000
O
-FS
ZS
Input Voltage AIN+ - AIN- (LSB)
+FS - 1LSB
Full Scale = +V
REF
/2
-Full Scale = -V
REF
/2
Zero Scale = 0
1LSB = V
REF
/4096
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