XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 67

• Manufacturer Part Number: XE8000EV120
• Description: BOARD EVAL FOR SX8722I070TRLF
• Manufacturer: Semtech
• Series: ZoomingADC™r

Specifications of XE8000EV120

• Number Of Adc's: 1
• Number Of Bits: 16
• Data Interface: I²C
• Inputs Per Adc: 7 Single or 4 Differential
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: SX8722
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XM8000EV120; XM8000EV120

12.8.7. Output Code Format
The ADC output code is a 16-bit word in two's complement format (see Table 55). For input voltages outside the range, the
output code is saturated to the closest full-scale value (i.e. 0x7FFF or 0x8000). For resolutions smaller than 16 bits, the non-
significant bits are forced to the values shown in Table 56. The output code, expressed in LSBs, corresponds to:
Recalling equation Eq. 9, this can be rewritten as:
where, from Eq. 10 and Eq. 11, the total PGA gain and offset are respectively:
and:
ACS - Revision 4.2
©2008 Semtech Corp.
OUT
ADVANCED COMMUNICATIONS & SENSING
ADC
GDoff
OUT
=
2
16
GD
ADC Input Voltage
ADC
TOT
⋅
V
TOT
V
+2.49505 V
+2.49497 V
+76.145 μ V
REF
-76.145 μ V
IN
=
=
V
GDoff
IN,ADC
=
2
⋅
16
...
...
(Eq. 17)
0
⎛
⎜ ⎜
⎝
GD
GD
⋅
V
V
3
IN
3
TOT
(Eq. 18)
⋅
REF
,
GD
+
ADC
GD
−
October 2008
2
⋅
GDoff
⋅
OSR
3
GD
% of Full Scale (FS)
⋅
OSR
GDoff
1
+
TOT
+0.5 x FS
1
2
⋅
...
...
...
...
...
0
V
V
REF
IN
⎞
⎟ ⎟
⎠
⋅
OSR 1
[
[
[
LSB
OSR
V V ⁄
V V ⁄
Page 67
]
+
]
]
Output in LSBs
+2
+2
[
15
15
LSB
-1 = 32’767
-2 = 32’767
High gain acquisition for sensor interface
+1
-1
]
...
...
0
Output Code in Hex
7FFE
7FFF
8FFF
0001
0000
...
...
DATASHEET
www.semtech.com
SX8722