LT1630CS8#PBF Linear Technology, LT1630CS8#PBF Datasheet - Page 17

• Manufacturer Part Number: LT1630CS8#PBF
• Description: IC OPAMP R-R IN/OUT DUAL 8-SOIC
• Manufacturer: Linear Technology
• Type: General Purpose Amplifierr

Specifications of LT1630CS8#PBF

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 10 V/µs
• Gain Bandwidth Product: 30MHz
• Current - Input Bias: 550nA
• Voltage - Input Offset: 220µV
• Current - Supply: 4.1mA
• Current - Output / Channel: 70mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 36 V, ±1.35 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rail/rail I/o Type: Rail to Rail Input/Output
• Number Of Elements: 2
• Unity Gain Bandwidth Product: 30MHz
• Common Mode Rejection Ratio: 79dB
• Input Offset Voltage: 525uV
• Input Bias Current: 1uA
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): ±15V
• Voltage Gain In Db: 130.88dB
• Power Supply Rejection Ratio: 87dB
• Power Supply Requirement: Single/Dual
• Shut Down Feature: No
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 36V
• Dual Supply Voltage (min): ±1.35V
• Dual Supply Voltage (max): ±18V
• Technology: BiCOM
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Compliant

Typical applicaTions
Single Supply, 40dB Gain, 350kHz
Instrumentation Amplifier
An instrumentation amplifier with a rail-to-rail output swing,
operating from a 3V supply can be constructed with the
LT1630 as shown in Figure 2. The amplifier has a nominal
gain of 100, which can be adjusted with resistor R5. The
DC output level is set by the difference of the two inputs
multiplied by the gain of 100. Common mode range can
be calculated by the equations shown with Figure 2. For
example, the common mode range is from 0.15V to 2.65V
if the output is set at one half of the 3V supply. The com-
mon mode rejection is greater than 110dB at 100Hz when
trimmed with resistor R1. The amplifier has a bandwidth
of 355kHz as shown in Figure 3.
BW
A
V
Figure 2. Single Supply, 40dB Gain Instrumentation Amplifier
OUT
V
=
=
20k
R1
=
R
R
355
V
4
3
(
IN
V

 
–
kHz
I
N N
1
+
+
–
R
R
2
V
1
IN
+
–10
–20
–30
–40
–50
–60
–70
–
+
–
1/2 LT1630
R
50
40
30
20
10
)
0
3
•
100
R
+
A
5
Figure 3. Frequency Response
R
V
V
2
S

 
COMMON MODE INPUT
=
R2
2k
100
DIFFERENTIAL INPUT
1k
OUT1
FREQUENCY (Hz)
LOWER LIMIT COMMON MODE INPUT VOLTAGE
UPPER LIMIT COMMO O N MODE INPUT VOLTAGE
10k
V
V
WHERE
CML
CMH
432
R5
=
=
R3
2k
V








V IS THE SUPPLY CUR R RENT

 
IN

 
100k
S
V
V
+
A
A
OUT
OUT
V V
V

 

 
R
R
R
R
2
5
2
5
–
+
20k
V
A
1M
R4
1/2 LT1630
+
+
S
V
0 1
(
= 3V
= 100
V
1630/31 F03
.
1630/31 F02
S
V
– 0 0 15




1 0
1 1
10M
.
.
.
V
)




1 0
1 1
.
.
V
OUT
Tunable Q Notch Filter
A single supply, tunable Q notch filter as shown in Figure 4
is built with LT1630 to maximize the output swing. The
filter has a gain of 2, and the notch frequency (f
by the values of R and C. The resistors R10 and R11 set
up the DC level at the output. The Q factor can be adjusted
by varying the value of R8. The higher value of R8 will
decrease Q as depicted in Figure 5, because the output
induces less of feedback to amplifier A2. The value of R7
should be equal or greater than R9 to prevent oscillation.
If R8 is a short and R9 is larger than R7, then the positive
feedback from the output will create phase inversion at the
output of amplifier A2, which will lead to oscillation.
4.7µF
C2
V
R10
IN
10k
5V
–20
–40
2.2µF
R11
10k
40
20
C1
R9
1k
0
0
Figure 4. Tunable Q Notch Filter
Figure 5. Frequency Response
20 40 60
DECREASING R8
R1
500
f
f
O
O
–
1/2 LT1630
+
=
=
98
2
π
1000pF
kHz
1.62k
1
A2
RC
R2
1k
FREQUENCY (kHz)
R
C
INCREASING R8
80 100 120
1000pF
1.62k
LT1630/LT1631
C
R
V
A
O DC
V
(
=
R8
140 160 180 200
5k
)
2 2
=
( )( )
R
5
R5
1k
11
V R
C5
4.7µF
+
+
1/2 LT1630
–
13630/31 F05
R
11
10
A1
R6
5V
1k
=
2 5
.
V
O

) is set
1630/31 F04
R7
1k
16301fa
V
OUT