Giantec Semiconductor Inc. is a high-tech company located in Zhangjiang Hi-Tech Park, specializing in R&D, manufacturing and sales of high-performance, high-quality analog and digital integrated circuit products. Its purpose is not only to provide customers with the components they need, but also to provide customers with complete application solutions. Giantec Semiconductor Inc. was formerly the wholly-owned subsidiary of ISSI (Integrated Silicon Solution, Inc.) in the United States, Core Semiconductor (Shanghai) Co., Ltd. Giantec's core team includes managers who have accumulated 10 to 20 years of senior management experience in domestic and foreign integrated circuit design companies, as well as technical experts with more than 10 years of experience in digital and analog product design.
• The GT7359 is a single supply, low power CMOS dual operational amplifier; these amplifiers offer bandwidth of 1MHz, rail-to-rail inputs and outputs, and single-supply operation from 2.2V to 5.5V. Typical low quiescent supply current of 80μA in dual operational amplifiers within one chip and very low input bias current of 10pA make the devices an ideal choice for low offset, low power consumption and high impedance applications such as smoke detectors, photodiode amplifiers, and other sensors.
• The GT7359 is available in SOP8 and MSOP8 packages. The extended temperature range of -40℃ to +125℃ over all supply voltages offers additional design flexibility.
Parameters
• Number of channels: 2
• Shutdown: N
• Input voltage (V): 2.2~5.5
• Bandwidth (MHz): 1
• Slew rate (V/ms): 0.6
• Quiescent current (uA): 80
• Input bias current (pA): 10
• Input offset voltage (max) (mV): 5
• Rail-to-rail input and output: Y/Y
• Package: SOP8, MSOP8
• Production status:
Application
Portable Equipment、Mobile Communications、Smoke Detector、Sensor Interface、Medical Instrumentation、Battery-Powered Instruments、Handheld Test Equipment
its products at any time without notice. Giantec products are not designed, intended, authorized or warranted for use as components in systems
or equipment intended for critical medical or surgical equipment, aerospace or military, or other applications planned to support or sustain life. It is
the customer's obligation to optimize the design in their own products for the best performance and optimization on the functionality and etc.
Giantec assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and prior placing orders for products.
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GT7359
5. Application Information
5.1 Size
GT7359 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. The small
footprints of the GT7359 series packages save space on printed circuit boards and enable the design of smaller electronic
products.
5.2 Power Supply Bypassing and Board Layout
GT7359 series operates from a single 2.2V to 5.5V supply or dual ±
1.1V to ±
2.75V supplies. For best performance, a 0.1μF
ceramic capacitor should be placed close to the V
DD
pin in single supply operation. For dual supply operation, both V
DD
and V
SS
supplies should be bypassed to ground with separate 0.1μF ceramic capacitors.
5.3 Low Supply Current
The low supply current (typical 80μA) of GT7359 series will help to maximize battery life. They are ideal for battery powered
systems
5.4 Operating Voltage
GT7359 series operate under wide input supply voltage (2.2V to 5.5V). In addition, all temperature specifications apply from
-40
C
to +125
C.
Most behavior remains unchanged throughout the full operating voltage range. These guarantees ensure
operation throughout the single Li-Ion battery lifetime
o
o
5.5 Rail-to-Rail Input
The input common-mode range of GT7359 series extends 100mV beyond the supply rails (V
SS
-0.1V to V
DD
+0.1V). This is
achieved by using complementary input stage. For normal operation, inputs should be limited to this range.
5.6 Rail-to-Rail Output
Rail-to-Rail output swing provides maximum possible dynamic range at the output. This is particularly important when
operating in low supply voltages. The output voltage of GT7359 series can typically swing to less than 10mV from supply rail in
light resistive loads (>100kΩ), and 60mV of supply rail in moderate resistive loads (10kΩ).
5.7 Capacitive Load Tolerance
The GT7359 series can directly drive 250pF capacitive load in unity-gain without oscillation. Increasing the gain enhances the
amplifier’s ability to drive greater capacitive loads. In unity-gain configurations, the capacitive load drive can be improved by
inserting an isolation resistor R
ISO
in series with the capacitive load, as shown in
Figure 2
.
-
V
IN
+
R
ISO
V
OUT
C
L
Figure 2. Indirectly Driving a Capacitive Load Using Isolation Resistor
The bigger the R
ISO
resistor value, the more stable V
OUT
will be. However, if there is a resistive load R
L
in parallel with the
capacitive load, a voltage divider (proportional to R
ISO
/R
L
) is formed, this will result in a gain error.
The circuit in
Figure 3
is an improvement to the one in
Figure 2
. R
F
provides the DC accuracy by feed-forward the V
IN
to R
L
. C
F
and R
ISO
serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the
amplifier’s inverting input, thereby preserving the phase margin in the overall feedback loop. Capacitive drive can be increased
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GT7359
by increasing the value of C
F
. This in turn will slow down the pulse response.
C
F
R
F
-
V
IN
+
R
ISO
V
OUT
C
L
R
L
Figure 3. Indirectly Driving a Capacitive Load with DC Accuracy
5.8 Differential amplifier
The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the two inputs. It is useful
as a computational amplifier in making a differential to single-end conversion or in rejecting a common mode signal.
Figure 4.
shown the differential amplifier using GT7359.
R
2
R
1
V
IN
R
3
V
IP
R
4
V
REF
+
-
V
OUT
Figure 4. Differential Amplifier
R
V
OUT
½
(
R
13
R
24
)
R
14
V
IN
R R
R
2
R
V
IP
(
R
13
R
24
)
R
13
V
REF
R
1
R R
If the resistor ratios are equal (i.e. R
1
=R
3
and R
2
=R
4
), then
V
OUT
½
R
2
R
1
(
V
IP
V
IN
)
V
REF
5.9 Instrumentation Amplifier
The input impedance of the previous differential amplifier is set by the resistors R1, R2, R3, and R4. To maintain the high input
impedance, one can use a voltage follower in front of each input as shown in the following two instrumentation amplifiers.
5.10 Three-Op-Amp Instrumentation Amplifier
The dual GT7359 can be used to build a three-op-amp instrumentation amplifier as shown in
Figure 5
.
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GT7359
R
2
-
V
IM
+
R
1
-
V
OUT
+
V
IP
+
-
R
3
R
4
V
REF
Figure 5. Three-Op-Amp Instrumentation Amplifier
The amplifier in
Figure 5
is a high input impedance differential amplifier with gain of R
2
/R
1
. The two differential voltage followers
assure the high input impedance of the amplifier.
V
o
½
(1
R
4
R
3
)(
V
IP
V
IN
)
5.11 Two-Op-Amp Instrumentation Amplifier
GT7359 can also be used to make a high input impedance two-op-amp instrumentation amplifier as shown in
Figure 6
.
R
2
R
1
-
V
IM
+
R
3
R
4
-
V
OUT
+
V
IP
Figure 6. Two-Op-Amp Instrumentation Amplifier
Where R
1
=R
3
and R
2
=R
4
. If all resistors are equal, then
V
o
=2(V
IP
-V
IN
)
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GT7359
5.12 Single-Supply Inverting Amplifier
The inverting amplifier is shown in Figure 6. The capacitor C
1
is used to block the DC signal going into the AC signal source V
IN
.
The value of R
1
and C
1
set the cut-off frequency to ƒ
C
=1/(2πR
1
C
1
). The DC gain is defined by V
OUT
=-(R
2
/R
1
)V
IN
R
2
C
1
V
IN
R
3
V
IP
R
4
+
R
1
-
V
OUT
Figure 7. Single Supply Inverting Amplifier
5.13 Low Pass Active Filter
The low pass active filter is shown in
Figure 8
. The DC gain is defined by –R
2
/R
1
. The filter has a -20dB/decade roll-off after
its corner frequency ƒ
C
=1/(2πR
3
C
1
).
C
1
R
2
R
1
V
IN
-
V
OUT
+
R
3
Figure 8. Low Pass Active Filter
5.14 Sallen-Key 2
nd
Order Active Low-Pass Filter
GT7359 can be used to form a 2
V
OUT
is given by
nd
order Sallen-Key active low-pass filter as shown in
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