SP8603KN View Datasheet(PDF) - Signal Processing Technologies
Part Name
Description
Manufacturer
SP8603KN Datasheet PDF : 11 Pages
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Input Voltage Range Defined As:
Analog Input Connected to Pin
Pin Connected to AGND
One Least Significant Bit (LSB)
INPUT VOLTAGE RANGE AND LSB VALUES
FSR/212
0V to +10V
2
3
10V/212
2.44mV
OUTPUT TRANSITION VALUES
FFEH TO FFFH
7FFH TO 800H
000H to 001H
+ FULL SCALE
Mid Scale
0V
+10V–3/2LSB
+9.963V
4.9988V
1.22mV
Table 2. Input Voltages, Transition Voltages and LSB Values
0V to +5V
3
2
5V/212
1.22mV
+5V–3/2LSB
+4.9982V
2.4994V
0.6mV
connections as shown in Figure 2 should be used.
Calibration Procedure
Apply a precision input voltage source to your
chosen input range (10V range at pin 2 or 5V at
pin 3). Set the A/D to convert continuously.
Monitor the output code. Trim the offset first,
then gain. Use the appropriate input voltages
and output target codes for your chosen input
range as follows. The recommended offset cali-
bration voltage values eliminate interaction be-
tween the offset and gain calibration
+5V Range Offset and Gain
Offset — Apply 0.0006V to the +5V input at pin
3. Adjust the offset potentiometer until the LSB
toggles on and off at code 0000 0000 0000BIN =
000H = 0000DEC.
Gain — Apply 4.9982V to the +5V input at pin
3. Adjust the gain potentiometer until the LSB
toggles on and off at code 1111 1111 1110BIN =
FFEH = 4094DEC.
+10V Range Offset and Gain
Offset — Apply 0.0012V to the +10V input at
pin 2. Adjust the offset potentiometer until the
LSB toggles on and off at code 0000 0000
0000 = 000 = 0000 .
BIN
H
DEC
Gain — Apply 9.9963V to the +10V input at pin
2. Adjust the gain potentiometer until the LSB
toggles on and off at code 1111 1111 1110BIN =
FFEH = 4094DEC.
Layout Considerations
Because of the high resolution and linearity of the
SP86XX Series, system design problems such as
ground path resistance and contact resistance become
very important.
The input resistance of the SP86XX Series is 6.3kΩ
or 4.2KΩ (for the 10V and 5V ranges respectively).
GAIN ADJUST
+10V
Input R2=500Ω
+5V
R1=10KΩ
6.65KΩ
10KΩ
100Ω
–15V
SP86XX
2
3
4
5
6
7
a)
GAIN ADJUST
+5V
Input R2=500Ω
+5V
R1=10KΩ
10KΩ
30.1KΩ 301Ω
–15V
UNIPOLAR ZERO ADJUST
2 SP86XX
3
4
5
6
7
b)
Figure 3. a) 10V Range b) 5V Range — With External Trims
85
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