AD8250-EVALZ Analog Devices Inc, AD8250-EVALZ Datasheet - Page 21

• Manufacturer Part Number: AD8250-EVALZ
• Description: BOARD EVALUATION AD8250
• Manufacturer: Analog Devices Inc
• Series: iCMOS®r

Specifications of AD8250-EVALZ

• Channels Per Ic: 1 - Single
• Amplifier Type: Instrumentation
• Output Type: Single-Ended
• Slew Rate: 25 V/µs
• -3db Bandwidth: 10MHz
• Current - Output / Channel: 37mA
• Operating Temperature: -40°C ~ 85°C
• Current - Supply (main Ic): 4.1mA
• Voltage - Supply, Single/dual (±): 10 V ~ 30 V, ±5 V ~ 15 V
• Board Type: Fully Populated
• Utilized Ic / Part: AD8250
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DATA ACQUISITION
The AD8250 makes an excellent instrumentation amplifier for
use in data acquisition systems. Its wide bandwidth, low distortion,
low settling time, and low noise enable it to condition signals in
front of a variety of 16-bit ADCs.
Figure 59 shows a schematic of the AD825x data acquisition
demonstration board. The quick slew rate of the AD8250 allows
it to condition rapidly changing signals from the multiplexed
inputs. An FPGA controls the AD7612, AD8250, and ADG1209.
In addition, mechanical switches and jumpers allow users to pin
strap the gains when in transparent gain mode.
This system achieved −111 dB of THD at 1 kHz and a signal-to-
noise ratio of 91 dB during testing, as shown in Figure 58.
+CH1
+CH2
+CH3
+CH4
–CH4
–CH3
–CH2
–CH1
806Ω
806Ω
806Ω
806Ω
806Ω
806Ω
806Ω
806Ω
0.1µF
0.1µF
10
11
12
4
5
6
7
S1A EN
S2A
S3A
S4A
ADG1209
S4B
S3B
S2B
S1B
+12V
–12V
V
V
14
DD
SS
3
Figure 59. Schematic of ADG1209, AD8250, and AD7612 in the AD825x DAQ Demo Board
A1
16
2
GND
JMP
DA
DB
A0
1
15
JMP
8
9
+12V
+5V
0Ω
0Ω
+5V
R8
2kΩ
DGND
10µF
+
DGND
DGND
2kΩ
0Ω
0Ω
GND
C
D
10µF
+
–12V
C
C
+IN
–IN
0.1µF
Rev. B | Page 21 of 24
DGND
10
1
C3
DGND
+
–
2
AD8250
+12V –12V
+V
8
WR
S
6
–V
3
A1
S
5
A0
REF
4
C4
0.1µF
JMP
9
Figure 58. FFT of the AD825x DAQ Demo Board Using the AD8250,
JMP
+5V
–100
–110
–120
–130
–140
7
–10
–20
–30
–40
–50
–60
–70
–80
–90
DGND
OUT
2kΩ
0
0
+5V
0Ω 49.9Ω
DGND
2kΩ
5
10
JMP
–V
+IN
1nF
15
S
FREQUENCY (kHz)
1 kHz Signal
20
AD7612
ADR435
25
EPF6010ATC144-3
30
ALTERA
35
40
AD8250
45
50