Global Mixed-mode Technology Inc.
G1201
Rail-to-Rail I/O, 100mA Output Single-Supply Amplifiers
Features
Single-Supply Operation: 2.2 Volts to 6 Volts
High Output Current: ±100mA
Wide Bandwidth: 3.5 MHz
Slew Rate: 6.2 V/µs
No Phase Reversal
Unity Gain Stable
Rail-to-Rail Input and Output
Applications
Multimedia Audio
LCD Driver
ASIC Input or Output Amplifier
Headphone Driver
General Description
The G1201 is dual rail-to-rail input and output single-supply amplifiers featuring 100mA output drive
current. This high output current makes these amplifiers excellent for driving either resistive or capacitive
loads. AC performance is very good with 3.5MHz
bandwidth, 6.2V/µs-slew rate and low distortion. All
are guaranteed to operate from a +3 volt single supply
as well as a +5 volt supply.
The very low input bias currents enable the G1201 to
be used for integrators and diode amplification and
other applications requiring low input bias current. Allowing low current applications to control high current
loads.
Applications include audio amplification for computers,
sound ports, sound cards and set-top boxes. The
G1201 is very stable and capable of driving heavy
capacitive loads.
The ability to swing rail-to-rail at the inputs and outputs
enables designers to buffer CMOS ADC/DACs, ASICs
or other wide output swing devices in single-supply
systems.
Pin Configuration
G1201
V-
1
2
3
4
8Pin SOP
1
OUT A
-IN A
+IN A
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Ver 1.1
Mar 15, 2002
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
G1201 -40°C to +85°C 8 SOP
8
V+
OUT B
7
-IN B
6
5
+IN B
TEL: 886-3-5788833
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Global Mixed-mode Technology Inc.
G1201
Absolute Maximum Ratings
Supply Voltage (VS)…………………..…...…………+7V
Input Voltage ………………….…………...…GND to V
Differential Input Voltage**……………….…………±6V
Storage Temperature Range…….……-65°C to +150°C
Operating Temperature Range….…..…-40°C to +85°C
*
Lead Temperature Range (Soldering,60 sec)…+300°C
S
1
……………………………………………..….150°C/W
θ
JA
θ
JC……………………………………………………………..………………….
1
is specified for the worst case conditions,
θ
JA
device soldered onto a circuit board for surface-mount packages.
43°C/W
is specified for
θ
JA
Junction Temperature Range……...…-65°C to +150°C
*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating
only; the functional operation of the device at these or any other conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
For supplies less than +6V, the differential input voltage is equal to
**
Electrical Characteristics
(VS = +3.0V, VCM = 1.5V, TA=+25°C unless otherwise noted)
±
VS.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Input Characteristics
Offset Voltage VOS 5 15 mV
Input Bias Current IB 50 250 pA
Input Offset Current IOS 25 125 pA
Input Voltage Range VCM 0 3 V
Common-Mode Rejection Ratio CMRR VCM = 0V to 3V 60 dB
Large Signal Voltage Gain AVO RL = 2kΩ
= 0.5V to 2.5V
V
O
Output Characteristics
Output Voltage High VOH IL = 10mA 2.85 2.91 V
Output Voltage Low VOL IL = 10mA 60 100 mV
Output Current I
Power Supply
Power Supply Rejection Ratio PSRR fi= 1k
Supply Current/Amplifier ISY VO = 0V 1.5 2.5 mA
Dynamic Performance
Slew Rate SR RL = 2kΩ 2.8 V/µs
Settling Time ts To 0.1% 2.5 µs
Gain Bandwidth Product GBP 2.2 MHz
Channel Separation CS f = 1kHz
Total Harmonic Distortion THD f = 1kHz
Specifications subject to change without notice.
±100 mA
OUT
V
ripple(PEAK)
R
L
A
V
R
L
V
O(P-)
= 1V
= 32Ω
= -1
=32Ω
=2.45V
80 dB
63 dB
70 dB
50
dB
Ver 1.1
Mar 15, 2002
2
TEL: 886-3-5788833
http://www.gmt.com.tw
Global Mixed-mode Technology Inc.
G1201
Electrical Characteristics
(VS = +5.0V, VCM = 2.5V, TA=+25°C unless otherwise noted)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Input Characteristics
Offset Voltage VOS 5 15 mV
Input Bias Current IB 50 500 pA
Input Offset Current IOS 25 250 pA
Input Voltage Range VCM 0 5 V
Common-Mode Rejection Ratio CMRR VCM = 0V to 5V 40 65 dB
Large Signal Voltage Gain AVO RL = 2kΩ
= 0.5V to 4.5V
V
O
Output Characteristics
Output Voltage High VOH IL = 10mA 4.90 4.94 V
Output Voltage Low VOL IL = 10mA 50 100 mV
Output Current I
Power Supply
Power Supply Rejection Ratio PSRR fi= 1kHz
Supply Current/Amplifier ISY VO = 0V 3.5 6 mA
Dynamic Performance
Slew Rate SR RL = 2kΩ 6.2 V/µs
Full-Power Bandwidth BWp RL = 32Ω
Settling Time ts To 0.1% 1.3
Gain Bandwidth Product GBP 3.5 MHz
Channel Separation CS f = 1kHz, RL = 32Ω 70 dB
Total Harmonic Distortion THD f = 1kHz, AV = -1 RL = 32Ω, V
Specifications subject to change without notice.
±100 mA
OUT
V
ripple(PEAK)
V
O(P-P)
THD = 50dB
= 1V
= 4.2V
= 4.3V 50 dB
O(P-P)
70 90 dB
50 66 dB
30 kHz
s
µ
Caution
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 2000V readily accumulate
on the human body and test equipment and can discharge without detection.
Although the G1201 feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of
functionality.
Applications
Theory of Operation
The G1201 is an all-CMOS, high output current drive,
rail-to-rail input/output operational amplifier. Its high
output current drive and stability with heavy capacitive
loads makes the G1201 an excellent choice as a drive
amplifier.
Short-Circuit Protection
As a result of the design of the output stage for maximum load current capability, the G1201 does not have
any internal short-circuit protection circuitry. Direct
connection of the G1201’s output to the positive supply in single-supply applications will destroy the device.
In those applications where some protection is needed,
but not at the expense of reduced output voltage
headroom, a low value resistor in series with the output, as shown in Figure 1, can be used. The resistor,
connected within the feedback loop of the amplifier,
will have very little effect on the performance of the
amplifier other than limiting the maximum available
output voltage swing.
+5V
V
IN
+
_
20
R
X
Ω
V
OUT
Figure 1. Output Short-Circuit Protection
Ver 1.1
Mar 15, 2002
3
TEL: 886-3-5788833
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Global Mixed-mode Technology Inc.
Input Overvoltage Protection
As with any semiconductor device, whenever the condition exists for the input to exceed either supply voltage, the device’s input overvoltage characteristic must
be considered. When an overvoltage occurs, the amplifier could be damaged depending on the magnitude
of the applied voltage and the magnitude of the fault
current. Although not shown here, when the input
voltage exceeds either supply by more than 0.6V,
pn-junctions internal to the G1201 energize allowing
current to flow from the input to the supplies. the
G1201 does not have any internal current limiting resistors, so fault currents can quickly rise to damaging
levels.
This input current is not inherently damaging to the
device as long a it is limited to 5 mA or less. For the
G1201, once the input voltage exceeds the supply by
more than 0.6V the input current quickly exceeds 5
mA. If this condition continues to exist, an external
series resistor should be added. The size of the resistor is calculated by dividing the maximum overvoltage
by 5 mA. For example, if the input voltage could reach
10V, the external resistor should be (10V/ 5mA) = 2kΩ.
This resistance should be placed in series with either
or both inputs if they are exposed to an overvoltage
condition.
A Single-Supply Headphone Amplifier
Because of its speed and large output drive, the
G1201 make an excellent headphone driver, as illustrated in Figure 2. Its low supply operation and
rail-to-rail inputs and outputs give a maximum signal
swing on a single +5V supply. To ensure maximum
signal swing available to drive the headphone, the
amplifier inputs are biased to V+/2, which in this case
is 2.5V. The 100kΩ resistor to the positive supply is
equally split into two 50 kΩ resistors, with their common point bypassed by 10µF to prevent power supply
noise from contaminating the audio signal.
G1201
The audio signal is then ac-coupled to each input
through a 10µF capacitor. A large value is needed to
ensure that the 20Hz audio information is not blocked.
If the input already has the proper dc bias, the ac coupling and biasing resistors are not required. A 270µF
capacitor is used at the output to couple the amplifier
to the headphone. This value is much larger than that
used for the input because of the low impedance of
the head-phones, which can range from 32Ω to 600Ω.
An additional 16Ω resistor is used in series with the
output capacitor to protect the op amp’s output stage
by limiting capacitor discharge current. When driving a
32Ω load, the circuit exhibits less than 0.3% THD+N at
output drive levels of 4.2 V
P-P
.
+V + 5V
+V + 5V 1µF 0.1 µF
50k
Ω
_
1/2
G1201
+
Ω
_
1/2
G1201
+
270µF
16
Ω
+
270µF
16
Ω
+
50k
50k
LEFT
HEADPHONE
Ω
RIGHT
HEADPHONE
Ω
INPUT
INPUT
50k
10µF
50k
50k
10µF
+
10µF
Ω
+LEFT
100k
+V
Ω
+
10µF
Ω
+RIGHT
100k
Ω
Figure 2. A Single-Supply, Stereo Headphone Driver
Ver 1.1
Mar 15, 2002
4
TEL: 886-3-5788833
http://www.gmt.com.tw
Global Mixed-mode Technology Inc.
Input Common Mode Voltage Range Figure
Test Condition
TA = 25°C, AV=1
：：：：
G1201
V+ = 5V, V- = 0V, RL = 2K
V+ = 5V, V- = 0V, RL = 250
ΩΩΩΩ
ΩΩΩΩ
V+ = 3V, V- = 0V, RL = 2K
V+ = 3V, V- = 0V, RL = 250
ΩΩΩΩ
ΩΩΩΩ
Ver 1.1
Mar 15, 2002
5
TEL: 886-3-5788833
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Global Mixed-mode Technology Inc.
Output Swing Range Voltage Figure
G1201
Test Condition
V+ = 2.5V , V- = - 2.5V , RL=2k
V+ = 2.5V , V- = - 2.5V , RL=250
TA=25°C, AV= -1
：：：：
ΩΩΩΩ
ΩΩΩΩ
V+ = 1.5V , V- = - 1.5V , RL=2k
V+ = 1.5V , V- = - 1.5V , RL=250
ΩΩΩΩ
ΩΩΩΩ
V+ = 2.5V , V- = - 2.5V , RL=32
V+ = 2.5V , V- = - 2.5V , RL=16
ΩΩΩΩ
ΩΩΩΩ
V+ = 1.5V , V- = - 1.5V , RL=32
V+ = 1.5V , V- = - 1.5V , RL=16
ΩΩΩΩ
ΩΩΩΩ
Ver 1.1
Mar 15, 2002
6
TEL: 886-3-5788833
http://www.gmt.com.tw
y
pp
y
j
Global Mixed-mode Technology Inc.
Large Signal Transient Response Figure
Test Condition
TA=25°C, AV=1 , RL = 2k
：：：：
ΩΩΩΩ
G1201
V+ = 2.5V, V- = -2.5V
SR (rising) = 2.5V/408ns = 6.14V/µs
V+ = 1.5V, V- = -1.5V
V+ = 2.5V, V- = -2.5V
SR (falling) = 2.5V/327ns = 7.65 V/µs
V+ = 1.5V, V- = -1.5V
SR (rising) = 1.5V/522ns = 2.87 V/µs
Test Condition: TA=25°C, V+ = 2.5V, V- = -2.5V
Open-Loop Gain & Phase vs. Frequency
100.0
80.0
60.0
40.0
Gain - dB
20.0
0.0
0.1 1 10 100 1000 10000
Frequency - kHZ
-50
-70
-90
-110
-130
-150
SR (falling) = 1.5V/434ns = 3.45 V/µs
Test Condition: TA=25°C, V+ = 2.5V, V- = -2.5V
Power Supply Ripple Rejection vs. Frequenc
65.0
55.0
45.0
ection - dB
Re
35.0
l
Phase - degree
25.0
15.0
Power Su
5.0
0.1 1 10 100
Frequency - kHZ
PSRR +
PSRR -
1000
Ver 1.1
Mar 15, 2002
7
TEL: 886-3-5788833
http://www.gmt.com.tw
Global Mixed-mode Technology Inc.
Package Information
7
°
(4X)
E
H
D
A2
A
G1201
C
L
θ
y
Note:
1. Package body sizes exclude mold flash and gate burrs
2. Dimension L is measured in gage plane
3. Tolerance 0.10mm unless otherwise specified
4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact.
SYMBOL
A 1.35 1.60 1.75 0.053 0.063 0.069
A1 0.10 ----- 0.25 0.004 ----- 0.010
A2 ----- 1.45 ----- ----- 0.057 -----
B 0.33 ----- 0.51 0.013 ----- 0.020
C 0.19 ----- 0.25 0.007 ----- 0.010
D 4.80 ----- 5.00 0.189 ----- 0.197
E 3.80 ----- 4.00 0.150 ----- 0.157
e ----- 1.27 ----- ----- 0.050 -----
H 5.80 ----- 6.20 0.228 ----- 0.244
L 0.40 ----- 1.27 0.016 ----- 0.050
y ----- ----- 0.10 ----- ----- 0.004
θ
MIN. NOM. MAX. MIN. NOM. MAX.
0º ----- 8º 0º ----- 8º
DIMENSION IN MM DIMENSION IN INCH
e
B
A1
Taping Specification
Feed Direction
Feed Direction
Typical SOP Package Orientation
Typical SOP Package Orientation
GMT Inc. d oes not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver 1.1
Mar 15, 2002
8
TEL: 886-3-5788833
http://www.gmt.com.tw
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