XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 102

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The equivalent LSB size at the input of the PGA chain is:
Notice that the input voltage V
to remain within the ADC input range.
16.7.8
During low-speed operation, the bias current in the PGAs and ADC can be programmed to save power using the
control words IB_AMP_PGA[1:0] and IB_AMP_ADC[1:0] (see Table 16-26). If the system is idle, the PGAs and
ADC can even be disabled, thus, reducing power consumption to its minimum. This can considerably improve
battery lifetime.
16.8 Specifications and Measured Curves
This section presents measurement results for the acquisition chain. A summary table with circuit specifications and
measured curves are given.
16.8.1
Unless otherwise specified, the measurement conditions are the following:
© Semtech 2005
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LSB
V
IN
Power Saving Modes
Default Settings
,
ADC
=
2
1
≤
Temperature T
V
RC frequency f
Offsets GDOff
Power operation: normal (IB_AMP_ADC[1:0] = IB_AMP_PGA[1:0] = '11')
Resolution:
n
DD
⋅
1
2
Table 16-26. ADC & PGA power saving modes and maximum sampling frequency
GD
V
⋅
= +5V, GND = 0V, V
(
REF
V
TOT
REFP
IB_AMP_ADC
⋅
OSR
−
[1:0]
OSR
V
00
01
10
11
x
REFN
IN,ADC
2
A
+
RC
= GDOff
for n = 12 bits: OSR = 32 and N
for n = 16 bits: OSR = 512 and N
1
= +25°C
)
= 2MHz, sampling frequency f
⋅
OSR
of the ADC must satisfy the condition:
OSR
IB_AMP_PGA
(V)
3
+
REF
= 0
[1:0]
1
00
01
10
11
x
= +5V, V
(V)
Current
1/4⋅I
1/2⋅I
3/4⋅I
IN
ADC
Bias
I
ADC
x
= 0V
16-17
ADC
ADC
ADC
1/4⋅I
1/2⋅I
3/4⋅I
Current
PGA
Bias
I
ELCONV
S
PGA
x
ELCONV
= 500kHz
PGA
PGA
PGA
= 4
= 2
Max. f
(Eq. 19)
(Eq. 20)
[kHz]
62.5
62.5
125
250
500
125
250
500
S
XE8801A – SX8801R
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