SX8723CWLTDT SEMTECH [Semtech Corporation], SX8723CWLTDT Datasheet - Page 34

• Manufacturer Part Number: SX8723CWLTDT
• Description: ZoomingADC for sensing data acquisition
• Manufacturer: SEMTECH [Semtech Corporation]

Revision 1.01
© Semtech
where, from
and:
Table 19. Basic ADC Relationships (example for: VREF = 5V, OSR = 512, n = 16bits)
Table 20. Last forced LSBs in conversion output register for resolution settings smaller than 16bits
1.
ADVANCED COMMUNICATIONS & SENSING
ADC Input Voltage
V
+2.49505 V
+2.49497 V
...
+76.145 μV
0
-76.145 μV
...
-2.49505 V
-2.49513 V
SetOsr[2:0]
IN,ADC
(n<16) (RegACOutMsb[7:0] & RegACOutLsb[7:0])
‘000’
‘001’
‘010’
‘011’
‘100’
‘101’
‘110’
‘111’
Equation 11
SetNelconv = ‘00’
1000000000
10000000
100000
1000
10
-
-
-
% of Full Scale (FS)
+0.5 x FS
...
...
...
0
...
...
...
-0.5 x FS
January 2011
and
Equation
12, the total PGA gain and offset are respectively:
GDoff
SetNelconv = ‘01’
100000000
1000000
10000
100
1
-
-
-
GD
TOT
TOT
=
Equation 20
Equation 21
Page 34
GDoff
=
GD
Output in LSBs
+2
+2
...
+1
0
-1
...
-2
-2
15
15
15
15
-1 = -32’767
3
= -32’768
-1 = 32’767
-2 = 32’766
3
⋅
GD
+
GD
2
ZoomingADC for sensing data acquisition
⋅
3
GD
SetNelconv = ‘10’
10000000
100000
1000
10
-
-
-
-
⋅
GDoff
1
2
Hexadecimal Output Code
7FFF
7FFE
...
0001
0000
FFFF
...
8001
8000
www.semtech.com/products/
SetNelconv = ‘11’
1000000
10000
100
1
-
-
-
-
SX8723C
DATASHEET
1