4.096V
REF3040
+5V
0.1µF
+
R9
150kΩ
R1
6.04kΩ
R5
+5V
0.1µF
31.6kΩ
D1
R2
2.94kΩ
R2
549Ω
–
–
+
+
VO
OPA335
R6
K-Type
200Ω
Thermocouple
40.7µV/°C
Zero Adj.
R4
6.04kΩ
R3
60.4Ω
FIGURE 3. Temperature Measurement Circuit.
IIN
R1
IIN
R1
+5V
+2.5V
Photodiode
Photodiode
OPA343
OPA343
–2.5V
C1
C1
1MΩ
1MΩ
+5V
+2.5V
R2
R2
OPA335
NOTE: (1) Optional pull-down
resistor to allow below
ground output swing.
OPA335
40kΩ(1)
C2
C2
–2.5V
–5V
a. Split Supply.
b. Single Supply.
FIGURE 4. Auto-Zeroed Transimpedance Amplifier.
VEX = +2.5V
VEX
R1 = 105Ω
R1
R2
Select R1 so bridge
output ≤ VCMmax
@ VS = 2.7V,
CMmax = 1.2V
.
+5V
+2.7V
R
R
R
R
V
300Ω
VOUT
OPA335
Bridge
VOUT
OPA335
R1
R2
VREF
VREF
a. 5V Supply Bridge Amplifier.
b. 2.7V Supply Bridge Amplifier.
FIGURE 5. Single Op Amp Bridge Amplifier Circuits.
OPA334, OPA2334, OPA335, OPA2335
9
SBOS245D
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