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參數(shù)資料
| 型號： | AS1545-BQFT |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | ADC |
| 英文描述： | Dual 12-bit, 12-CH, 1Msps; Package Type: TQFN(5x5)-32 |
| 封裝： | TQFN(5x5)-32 |
| 文件頁數(shù)： | 21/34頁 |
| 文件大?。?/td> | 1587K |
| 代理商： | AS1545-BQFT |
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Revision 1.01
21 - 34
AS1545
Datasheet - Detailed Description
Single-Ended Mode
The AS1545 consists of 12 single-ended analog input channels with range that can be programmed to be either 0 to
V
REF
or 0 to 2 × V
REF
.
Note:
In applications where the signal source has high impedance, it is recommended to buffer the analog input
before applying it to the ADC.
If the sampling analog input is bipolar, the internal reference of the ADC can be used to externally bias up this signal to
make it correctly formatted for the ADC.
Figure 36
shows the connecting diagram when operating the ADC in single-
ended mode.
Figure 36. Single-Ended Mode Connection Diagram
Figure 37. Definition of Single-Ended Input
Fully Differential Mode
The AS1545 consists of six differential analog input pairs.
Figure 38
defines the fully differential analog input of the
AS1545. The amplitude of the differential signal is the difference between the signals applied to the AIN+ and AIN- pins
in each differential pair (AIN+ - AIN-). These pins should be simultaneously driven by two signals each of amplitude
V
REF
/2 (or V
REF
, depending on the range required) that are 180o out of phase. If RANGE = 1 is selected the amplitude
of the differential signal is ±V
REF
regardless of the common mode (CM).
The common mode is the average of the two signals and is therefore the voltage on which the two inputs are centered.
(V
IN
+ + V
IN
-)/2
Althought fully differential operation with phase between inputs of 180° is recommanded, non true differential signals
can also be applied.
(EQ 1)
Note:
It is important to note that the absolute voltage of the analog inputs goes from AGND to V
DD
.
+
-
+
-
V
IN
R
3R
R
R
REFA/
REFB
AIN0 to BIN5
-1.25V
0V
+1.25V
0V
+2.5V
10nF
4.7μF
10
Ω
0 < AIN < VDD
RANGE = 0
0 < AIN < VDD
RANGE = 1
VIN
VIN
t
t
VREF
2VREF
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