AS1545_1 AMSCO [austriamicrosystems AG], AS1545_1 Datasheet - Page 24

• Manufacturer Part Number: AS1545_1
• Description: Dual, 12-Bit, 1MSPS, SAR ADC
• Manufacturer: AMSCO [austriamicrosystems AG]

AS1545
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 42. Straight Binary Transfer Function for
Figure 44. Two’s Complement Transfer Function for
Digital Inputs
V
The AS1545 also has a V
to easily interface to both 3V and 5V processors. For example, if the AS1545 was operated with a V
V
Therefore, the AS1545 could be used with the 2 × V
to 3V digital parts.
www.austriamicrosystems.com
DRIVE
DRIVE
11....101
00...010
00...001
00...000
00...011
11...110
11...111
011....111
000...010
000...001
000...000
100...001
100...000
011...110
111...101
111...110
111...111
pin could be powered from a 3V supply, allowing a large dynamic range with low voltage digital processors.
Functionality
Single-Ended, RANGE = 0
0
Differential, RANGE = 0
Full Scale = V
Zero Scale = 0
1LSB = V
1
Full Scale = V
Zero Scale = -V
1LSB = V
-FS
2
REF
/4096
3
REF
Input Voltage V
REF
/4096
Input Voltage V
DRIVE
REF
REF
/2
/2
feature to control the voltage at which the serial interface operates and allows the ADC
ZS
INx
Full Scale
Transition
(LSB)
INx
(FS)
(LSB)
FS - 3/2LSB
+FS - 1LSB
REF
Revision 1.01
input range, with a V
Figure 43. Straight Binary Transfer Function for
Figure 45. Two’s Complement Transfer Function for
11....101
00...011
00...010
00...001
00...000
11...110
11...111
011....111
000...010
000...001
000...000
100...001
100...000
011...110
111...101
111...110
111...111
0
Single-Ended, RANGE = 1
Differential, RANGE = 1
Full Scale = +2V
Zero Scale = 0
1LSB = V
Full Scale = +V
Zero Scale = -V
1LSB = V
-FS
1
DD
2
REF
of 5V while still being able to interface
Input Voltage V
REF
/4096
Input Voltage V
3
/4096
REF
REF
REF
INx
ZS
INx
- V
Full Scale
Transition
INy
- V
(FS)
INy
DD
(LSB)
(LSB)
FS - 3/2LSB
of 5V, the
+FS - 1LSB
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