ADS-117MC Murata Power Solutions Inc, ADS-117MC Datasheet - Page 4

• Manufacturer Part Number: ADS-117MC
• Description: Analog To Digital Converter
• Manufacturer: Murata Power Solutions Inc

1. Connect the converter per Figure 3, Figure 4, and Table 1 for the ap-
2. Zero Adjustments
3. Full-Scale Adjustment
4. To confi rm proper operation of the device, vary the precision reference
CALIBRATION PROCEDURE
Apply a precision voltage reference source between the amplifi er’s
For bipolar operation, adjust the potentiometer such that the code fl ick-
Set the output of the voltage reference used in step 2 to the value
propriate input range. Apply a pulse of 150 nanoseconds to the START
CONVERT input (pin 16) at a rate of 250kHz. This rate is chosen to
reduce fl icker if LED’s are used on the outputs for calibration purposes.
analog input and ground. Adjust the output of the reference source per
Table 2. For unipolar, adjust the zero trimming potentiometer so that
the output code fl ickers equally between 0000 0000 0000 and 0000
0000 0001 with the pin 18 tied high (straight binary) or between 1111
1111 1111 and 1111 1111 1110 with the pin 18 tied low (complemen-
tary binary).
ers equally between 1000 0000 0000 and 1000 0000 0001 with pin 18
tied high (offset binary) or between 0111 1111 1111 and 0111 1111
1110 with pin 18 tied low (complementary offset binary).
shown in Table 1. Adjust the gain trimming potentiometer so that the
output code fl ickers equally between 1111 1111 1110 and 1111 1111
1111 for pin 18 tied high or between 0000 0000 0001 and 0000 0000
0000 for pin 18 tied low.
voltage source to obtain the output coding listed in Table 3.
+15V
–15V
+5V
4.7μF
4.7μF
4.7μF
0.1μF
OPERATION
UNIPOLAR
+
+
+
0.1μF
0.1μF
4.7μF
0.1μF
www.murata-ps.com
+
NOTE:
20
24
23
22
21 +10V REF.
13
14
Figure 3. ADS-117 Connection Diagram
BIPOLAR INPUT
For unipolar operation, ground pin 20.
For bipolar operation, connect pin 20 to pin 21.
Always bypass pin 21 as shown for both unipolar
and bipolar operation.
ADS-117
COMP BIN
12-Bit, 2MHz, Low-Power Sampling A/D Converters
0 to +2.5V, ±1.25V
INPUT RANGE
0 to 5V, ±2.5V
INPUT RANGE
0 +10V, ±5
0 to +10V
Table 1. Input Connections (using external calibration)
18
±5V
SIGNAL
INPUT
Technical enquiries email: [e-mail], tel:
Figure 4. Optional Calibration Circuit
Table 2. Zero and Gain Adjustments
12
11
10
15
17
16
19
9
8
7
6
5
4
3
2
1
+5V
5kΩ
R1
ADJUST
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
EOC
ENABLE (1-12)
START CONVERT
ANALOG INPUT
➀
➀
For values of R1 and R2 refer to Table 1.
GAIN
50Ω
5kΩ
ZERO ADJUST
R1
2
2
2
+1/2 LSB
+1.22mV
+1.22mV
OFFSET
ADJUST
ZERO/
+15V
R2
10kΩ
R2
14
2
6
–15V
➀
MDA_ADS-117.B01 Page 4 of 6
ADS-117
GAIN ADJUST
To Pin19
of ADS-117
+9.9963V
+4.9963V
RANGE
[phone]
UNIT
kΩ
kΩ
kΩ