SX8722I070LF SEMTECH [Semtech Corporation], SX8722I070LF Datasheet - Page 68

• Manufacturer Part Number: SX8722I070LF
• Description: High gain acquisition for sensor interface
• Manufacturer: SEMTECH [Semtech Corporation]

The equivalent LSB size at the input of the PGA chain is:
Notice that the input voltage V
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
Table 56. Last forced LSBs in conversion output registers for resolution settings smaller than 16 bits (n < 16)
SET_OSR[2:0]
V
IN
000
001
010
100
101
011
110
111
,
ADC
LSB
ADC Input Voltage
Table 55. Basic ADC Relationships (example for: V
≤
=
1
2
+2.49505 V
+2.49513 V
2
V
⋅
1
(
IN,ADC
n
V
(Eq. 20)
⋅
(Eq. 19)
REFP
GD
V
SET_NELC = 00
REF
TOT
−
V
IN,ADC
REFN
⋅
October 2008
OSR
1000000000
OSR
)
of the ADC must satisfy the condition:
10000000
% of Full Scale (FS)
⋅
(CxDataOutMsb[7:0] & CxDataOutLsb[7:0])
OSR
100000
+
OSR
1
1000
-0.5 x FS
10
+
-
-
-
...
1
SET_NELC = 01
[
V V ⁄
V [ ]
Page 68
]
100000000
1000000
Output in LSBs
-2
-2
10000
15
15
100
-1 = -32’767
High gain acquisition for sensor interface
= -32’768
1
-
-
-
REF
= 5V, OSR = 512, n = 16 bits)
SET_NELC = 10
10000000
Output Code in Hex
100000
1000
10
8001
8000
-
-
-
-
SET_NELC = 11
DATASHEET
www.semtech.com
SX8722
1000000
10000
100
1
-
-
-
-