XE8805 SEMTECH [Semtech Corporation], XE8805 Datasheet - Page 91

• Manufacturer Part Number: XE8805
• Description: Data Acquisition MCU
• Manufacturer: SEMTECH [Semtech Corporation]

in two's complement (see Sections 16.4 and 16.7 for details). The output code OUT
≅ -V
relationship:
where GD
© Semtech 2006
REF
/2 to +V
V
OUT
FS
IN
TOT
,
ADC
2 /
ADC
is the total PGA gain, and GDoff
=
REF
≅
GD
/2 respectively. As will be shown in section 16.6, V
V
V
TOT
REF
IN
,
ADC
⋅
2 /
V
Inputs
AC_A
AC_R
IN
RegACCfg5
RegACCfg4
RegACCfg3
RegACCfg2
RegACCfg1
RegACCfg0
Figure 16-2. ZoomingADC™ detailed functional block diagram
−
GDoff
0
1
2
3
4
5
6
7
0
1
2
3
TOT
⋅
V
V
5
IN
REF
Power Saving Modes
PGA Enabling
Conversion Start
Nbr of Elementary Cycles
Over-Sampling Ratio
Continuous vs. On-Request
V
f
S
REF
(V)
PGA1
TOT
GD1
2
is the total PGA offset.
OFF2
PGA2
GD2
4
16-5
7
OFF3
7
PGA3
GD3
ADC Busy Flag
Default Settings
Sampling Frequency f
RegACOutMSB
RegACOutLSB
IN,ADC
(Eq. 1)
(Eq. 2)
Acquisition Chain
Register Bank
is related to input voltage V
V
IN,ADC
ADC
ADC
f
S
is -FS/2 to +FS/2 for V
8
8
S
XE8805/05A
www.semtech.com
IN
by the
IN,ADC