XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 72
XE8000EV120
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
XM8000EV120
- Current page: 72 of 108
- Download datasheet (808Kb)
Finally, remember that power reduction is typically traded off with reduced linearity, larger noise and slower maximum
sampling speed.
12.15. Noise
Ideally, a constant input voltage V
code may vary for a fixed input voltage. Thus, a statistical analysis on the output code of 1200 conversions for a constant
input voltage was performed to derive the equivalent noise levels of PGA1, PGA2, and PGA3. The extracted rms output
noise of PGA1, 2, and 3 are given in Table 58: standard output deviation and output rms noise voltage. Figure 37 shows the
distribution for the ADC alone (PGA1, 2, and 3 bypassed). Quantization noise is dominant in this case, and, thus, the ADC
thermal noise is below 16 bits.
The simple noise model of Figure 38 is used to estimate the equivalent input referred rms noise V
in the model of Figure 39. This is given by the relationship:
where V
3 respectively. As shown in this equation, noise can be reduced by increasing OSR and N
averaging effect, but reduces noise).
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
V
N
,
IN
2
N1
=
, V
⎛
⎜ ⎜
⎝
GD
N2
V
Table 58. PGA Noise Measurements (n = 16 bits, OSR = 512, N
N
, and V
1
1
⎞
⎟ ⎟
⎠
2
Figure 37. ADC Noise (PGA1, 2 & 3 Bypassed, OSR = 512, N
+
N3
⎛
⎜ ⎜
⎝
GD
Standard deviation at ADC output (LSB)
are the output rms noise figures of Table 58, GD1, GD2, and GD3 are the PGA gains of stages 1 to
V
1
(
(Eq. 24)
OSR
N
⋅
GD
2
Output RMS noise(uV)
October 2008
2
⋅
IN
N
⎞
⎟ ⎟
⎠
2
should result in a constant output code. However, because of circuit noise, the output
ELCONV
Parameter
+
⎛
⎜ ⎜
⎝
GD
80
60
40
20
0
)
-5
1
⋅
GD
V
-4
Output Code Deviation From Mean Value [LSB]
N
3
2
⋅
-3
GD
-2
3
Page 72
⎞
⎟ ⎟
⎠
2
-1
205 x (V
0
PGA1
0.85
1
High gain acquisition for sensor interface
N1
[
2
)
V
3
340 x (V
2
rms
PGA2
4
1.4
ELCONV
5
]
N2
)
365 x (V
ELCONV
PGA3
= 2, V
1.5
ELCONV
N,IN
N3
= 2)
REF
)
of the acquisition chain
DATASHEET
(increases the ADC
= 5 V)
www.semtech.com
SX8722
Related parts for XE8000EV120
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
EVALUATION BOARD
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
EVALUATION BOARD
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
VOLTAGE SUPPRESSOR, TRANSIENT SEMTECH
Manufacturer:
Semtech
Datasheet:
Part Number:
Description:
HIGH VOLTAGE CAPACITORS MONOLITHIC CERAMIC TYPE
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
EZ1084CM5.0 AMP POSITIVE VOLTAGE REGULATOR
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
3.0 AMP LOW DROPOUT POSITIVE VOLTAGE REGULATORS
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
RailClamp Low Capacitance TVS Diode Array
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet: