XE8801AMI000WP Semtech, XE8801AMI000WP Datasheet - Page 111

• Manufacturer Part Number: XE8801AMI000WP
• Description: SENSING MACHINE WITH 16 + 10 BIT
• Manufacturer: Semtech

Specifications of XE8801AMI000WP

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (22 kB)
• Controller Series: XE8000
• Ram Size: 512 x 8
• Interface: UART, USRT
• Number Of I /o: 24
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: Die
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Other names: Q2722595

Figure 16-19 shows gain error drift vs. temperature for different PGA gains. The curves are expressed in % of Full-
Scale Range (FSR) normalized to 25°C.
Offset error is defined as the output code error for a zero volt input (ideally, output code = 0). The offset of the ADC
and the PGA1 stage are completely suppressed if N
The measured offset drift vs. temperature curves for different PGA gains are depicted in Figure 16-20. The output
offset error, expressed in LSB for 16-bit setting, is normalized to 25°C. Notice that if the ADC is used alone, the
output offset error is below ±1 LSB and has no drift.
16.8.6
Figure 16-21 plots the variation of quiescent current consumption with supply voltage V
between the 3 PGA stages and the ADC (see Table 16-28). As shown in Figure 16-22, if lower sampling frequency is
used, the quiescent current consumption can be lowered by reducing the bias currents of the PGAs and the ADC
with registers IB_AMP_PGA [1:0] and IB_AMP_ADC [1:0]. (In Figure 16-22, IB_AMP_PGA/ADC[1:0] = '11',
'10', '00' for f
Quiescent current consumption vs. temperature is depicted in Figure 16-23, showing a relative increase of nearly
40% between -45 and +85°C. Figure 16-24 shows the variation of quiescent current consumption for different
© Semtech 2005
Power Consumption
S
= 500, 250, 62.5kHz respectively.)
Figure 16-20 Offset error vs. temperature for different PGA gains
Figure 16-19 Gain error vs. temperature for different PGA gains
-0.1
-0.2
-0.3
-0.4
100
0.2
0.1
0.0
-20
-40
80
60
40
20
0
-50
-50
NORMALIZED TO 25°C
-25
NORMALIZED TO 25°C
-25
ELCONV
Temperature [°C]
Temperature [°C]
0
0
16-26
> 1.
25
25
50
50
75
75
1
5
20
100
1
5
20
100
100
100
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