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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/s No Phase Reversal Unity Gain Stable Rail-to-Rail Input and Output
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/s-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.
Applications
Multimedia Audio LCD Driver ASIC Input or Output Amplifier Headphone Driver
Ordering Information
ORDER ORDER NUMBER NUMBER (Pb free)
G1201P1U G1201P1Uf Note: P1: SOP-8 U: Tape & Reel
TEMP. RANGE
-40C to +85C
PACKAGE
SOP-8
Pin Configuration
G1201
OUT A -IN A +IN A V1 2 3 4 SOP-8 8 7 6 5 V+ OUT B -IN B +IN B
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings*
Supply Voltage (VS).........................................+7V Input Voltage ........................................GND to VS Differential Input Voltage**................................6V Storage Temperature Range............-65C to +150C Operating Temperature Range...........-40C to +85C
G1201
Junction Temperature Range.............-65C to +150C Reflow Temperature (soldering, 10sec)..............260C JA1.........................................................150C/W
1
JA is specified for the worst case conditions, JA is specified for device soldered onto a circuit board for surface-mount packages.
*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 VS.
Electrical Characteristics (VS = +3.0V, VCM = 1.5V, TA=+25C unless otherwise noted)
PARAMETER
Input Characteristics Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Output Characteristics Output Voltage High Output Voltage Low Output Current Power Supply Power Supply Rejection Ratio Supply Current/Amplifier Dynamic Performance Slew Rate Settling Time Gain Bandwidth Product Channel Separation Total Harmonic Distortion VOH VOL IOUT PSRR ISY SR ts GBP CS THD fi= 1k Vripple(PEAK) = 1V VO = 0V RL = 2k To 0.1% f = 1kHz RL = 32 f = 1kHz AV = -1 RL=32 VO(P-)=2.45V IL = 10mA IL = 10mA 2.85 ----------------2.91 60 100 --100 --V mV mA VOS IB IOS VCM CMRR AVO VCM = 0V to 3V RL = 2k VO = 0.5V to 2.5V ------0 ----5 50 25 60 80 15 250 125 3 ----mV pA pA V dB dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
63 1.5 2.8 2.5 2.2 70
--2.5 ---------
dB mA V/s s MHz dB
---
50
---
dB
Note: Specifications subject to change without notice.
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Global Mixed-mode Technology Inc.
PARAMETER
Input Characteristics Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Output Characteristics Output Voltage High Output Voltage Low Output Current Power Supply Power Supply Rejection Ratio Supply Current/Amplifier Dynamic Performance Slew Rate Full-Power Bandwidth VOH VOL IOUT PSRR ISY SR BWp IL = 10mA IL = 10mA 4.90 ----50 ------VOS IB IOS VCM CMRR AVO VCM = 0V to 5V RL = 2k VO = 0.5V to 4.5V ------0 40 70
G1201
MIN TYP
5 50 25 --65 90
Electrical Characteristics (VS = +5.0V, VCM = 2.5V, TA=+25C unless otherwise noted)
SYMBOL CONDITIONS MAX
15 500 250 5 -----
UNIT
mV pA pA V dB dB
4.94 50 100 66 3.5 6.2 30
--100 ----6 -----
V mV mA dB mA V/s kHz
fi= 1kHz Vripple(PEAK) = 1V VO = 0V RL = 2k RL = 32 VO(P-P) = 4.2V THD = 50dB To 0.1% f = 1kHz, RL = 32 f = 1kHz, AV = -1 RL = 32, VO(P-P) = 4.3V
Settling Time Gain Bandwidth Product Channel Separation Total Harmonic Distortion
ts GBP CS THD
---------
1.3 3.5 70 50
---------
s MHz dB dB
Note: Specifications subject to change without notice.
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.
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.
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 Figure 1. Output Short-Circuit Protection
+5V VIN + _ RX 20 VOUT
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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) = 2k. 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 100k resistor to the positive supply is equally split into two 50 k resistors, with their common point bypassed by 10F to prevent power supply noise from contaminating the audio signal.
G1201
The audio signal is then ac-coupled to each input through a 10F 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 270F 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 32 to 600. An additional 16 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 32 load, the circuit exhibits less than 0.3% THD+N at output drive levels of 4.2 VP-P.
+V + 5V +V + 5V 50k + 10F 50k LEFT INPUT + 10F _ 1/2 G1201 + 100k +V 16 270F + 50k LEFT HEADPHONE 1F 0.1 F
50k + 10F 50k RIGHT INPUT + 10F 100k _ 1/2 G1201 + 16 270F + 50k RIGHT HEADPHONE
Figure 2. A Single-Supply, Stereo Headphone Driver
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Global Mixed-mode Technology Inc.
Input Common Mode Voltage Range Figure
Test ConditionTA = 25C, AV=1
G1201
V+ = 5V, V- = 0V, RL = 2K
V+ = 5V, V- = 0V, RL = 250
V+ = 3V, V- = 0V, RL = 2K
V+ = 3V, V- = 0V, RL = 250
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Global Mixed-mode Technology Inc.
Output Swing Range Voltage Figure
Test ConditionTA=25C, AV= -1
G1201
V+ = 2.5V , V- = - 2.5V , RL=2k
V+ = 1.5V , V- = - 1.5V , RL=2k
V+ = 2.5V , V- = - 2.5V , RL=250
V+ = 1.5V , V- = - 1.5V , RL=250
V+ = 2.5V , V- = - 2.5V , RL=32
V+ = 1.5V , V- = - 1.5V , RL=32
V+ = 2.5V , V- = - 2.5V , RL=16
V+ = 1.5V , V- = - 1.5V , RL=16
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Global Mixed-mode Technology Inc.
Large Signal Transient Response Figure
Test ConditionTA=25C, AV=1 , RL = 2k
G1201
V+ = 2.5V, V- = -2.5V
V+ = 2.5V, V- = -2.5V
SR (rising) = 2.5V/408ns = 6.14V/s
SR (falling) = 2.5V/327ns = 7.65 V/s
V+ = 1.5V, V- = -1.5V
V+ = 1.5V, V- = -1.5V
SR (rising) = 1.5V/522ns = 2.87 V/s
SR (falling) = 1.5V/434ns = 3.45 V/s
Test Condition: TA=25C, V+ = 2.5V, V- = -2.5V
Open-Loop Gain & Phase vs. Frequency 100.0 80.0 Gain - dB 60.0 40.0 20.0 0.0 0.1 1 10 100 1000 Frequency - kHZ -50 -70 -90 -110 -130 -150 10000 Phase - degree
Test Condition: TA=25C, V+ = 2.5V, V- = -2.5V
Power Supply Ripple Rejection vs. Frequency Power Supply Rejection - dB 65.0 55.0 45.0 35.0 25.0 15.0 5.0 0.1 1 10 100 Frequency - kHZ 1000 PSRR + PSRR -
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Global Mixed-mode Technology Inc.
Recommended Minimum Footprint
SOP-8
G1201
Ver 1.2 Jul 24, 2005
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Global Mixed-mode Technology Inc.
Package Information
C
G1201
E
H
L D 7 (4X)
A2 A1 e B
A
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 A1 A2 B C D E e H L y
MIN.
1.35 0.10 ----0.33 0.19 4.80 3.80 ----5.80 0.40 ----0
DIMENSION IN MM NOM.
1.60 ----1.45 ----------------1.27 -----------------
MAX.
1.75 0.25 ----0.51 0.25 5.00 4.00 ----6.20 1.27 0.10 8
MIN.
0.053 0.004 ----0.013 0.007 0.189 0.150 ----0.228 0.016 ----0
DIMENSION IN INCH NOM.
0.063 ----0.057 ----------------0.050 -----------------
MAX.
0.069 0.010 ----0.020 0.010 0.197 0.157 ----0.244 0.050 0.004 8
Taping Specification
PACKAGE
SOP-8
Q'TY/REEL
2,500 ea
Feed Direction Typical SOP Package Orientation
GMT Inc. does 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 1.2 Jul 24, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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