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Rail-to-Rail High Output Current Operational Amplifiers
FEATURES Rail-to-Rail Inputs and Outputs High Output Current: ؎60 mA Single Supply: 5 V to 12 V Wide Bandwidth: 5 MHz High Slew Rate: 3 V/s Low Distortion: 0.01% Unity-Gain Stable No Phase Reversal Short-Circuit Protected Drives Capacitive Loads: 10 nF
APPLICATIONS Multimedia Telecom DAA Transformer Driver LCD Driver Low Voltage Servo Control Modems FET Drivers
GENERAL DESCRIPTION The OP179 and OP279 are rail-to-rail, high output current, single-supply amplifiers. They are designed for low voltage applications that require either current or capacitive load drive capability. The OP179/OP279 can sink and source currents of ± 60 mA (typical) and are stable with capacitive loads to 10 nF.
Applications that benefit from the high output current of the OP179/OP279 include driving headphones, displays, transformers and power transistors. The powerful output is combined with a unique input stage that maintains very low distortion with wide common-mode range, even in single supply designs.
The OP179/OP279 can be used as a buffer to provide much greater drive capability than can usually be provided by CMOS outputs. CMOS ASICs and DAC often have outputs that can swing to both the positive supply and ground, but cannot drive more than a few milliamps.
Bandwidth is typically 5 MHz and the slew rate is 3 V/µs, making these amplifiers well suited for single supply applications that require audio bandwidths when used in high gain configurations. Operation is guaranteed from voltages as low as 4.5 V, up to 12 V.
OP179/OP279
PIN CONFIGURATIONS
5-Lead SOT-23-5 (RT-5)
OP179
OUT A 1
5 V–
V+ 2
+IN A 3
4 ؊IN A
8-Lead SOIC (S Suffix)
NC 1 ؊IN A 2 +IN A 3
V؊ 4
OP179
8 NC 7 V+ 6 OUT A 5 NC
NC = NO CONNECT
8-Lead SOIC and TSSOP SO-8 (S) and RU-8
OUT A 1 ؊IN A 2 +IN A 3
V؊ 4
OP279
8 V+ 7 OUT B 6 ؊IN B 5 +IN B
Very good audio performance can be attained when using the OP179/OP279 in 5 volt systems. THD is below 0.01% with a 600 Ω load, and noise is a respectable 21 nV/√Hz. Supply current is less than 3.5 mA per amplifier.
The single OP179 is available in the 5-lead SOT-23-5 package. It is specified over the industrial (–40°C to +85°C) temperature range.
The OP279 is available in 8-lead TSSOP and SO-8 surface mount packages. They are specified over the industrial (–40°C to +85°C) temperature range.
REV. G
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2002
OP179/OP279–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS (@ VS = 5.0 V, VCM = 2.5 V, –40؇C ≤ TA ≤ +85؇C unless otherwise noted.)
Parameter
Symbol
Conditions
Min Typ Max
INPUT CHARACTERISTICS Offset Voltage OP179 OP279 Input Bias Current
Input Offset Current
Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift
OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low
Short-Circuit Limit Output Impedance
POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier Supply Voltage Range
DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin Capacitive Load Drive
VOS VOS IB
IOS
VCM CMRR AVO ∆VOS/∆T
VOH VOL
ISC ZOUT
PSRR ISY VS
SR GBP φm
VOUT = 2.5 V VOUT = 2.5 V VOUT = 2.5 V, TA = 25°C VOUT = 2.5 V VOUT = 2.5 V, TA = 25°C VOUT = 2.5 V
VCM = 0 V to 5 V RL = 1 kΩ, 0.3 V ≤ VOUT ≤ 4.7 V
0 56 20
IL = 10 mA Source IL = 10 mA Sink, TA = 25°C IL = 10 mA Sink TA = 25°C f = 1 MHz, AV = 1
VS = 4.5 V to 12 V VOUT = 2.5 V
RL = 1 kΩ, 1 nF
No Oscillation
+4.8 ± 40
70 +4.5
66 4
22 88
3 5 60 10
±5 ±4 ± 300 ± 700 ± 50 ± 100 5
75 100
3.5 +12
AUDIO PERFORMANCE Total Harmonic Distortion Voltage Noise Density
THD en
f = 1 kHz
0.01 22
ELECTRICAL SPECIFICATIONS (@ VS = ؎5.0 V, –40؇C ≤ TA ≤ +85؇C unless otherwise noted.)
Parameter
Symbol
Conditions
Min Typ
INPUT CHARACTERISTICS Offset Voltage OP179 OP279 Input Bias Current
VOS VOS IB
VOUT = 0
VOUT = 0 TA = 25°C
Input Offset Current
IOS TA = 25°C
Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift
OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short Circuit Limit Open-Loop Output Impedance
POWER SUPPLY Supply Current/Amplifier
VCM CMRR AVO ∆VOS/∆T
VOH VOL ISC ZOUT
ISY
DYNAMIC PERFORMANCE Slew Rate Full-Power Bandwidth Gain Bandwidth Product Phase Margin
SR BWp GBP φm
NOISE PERFORMANCE Voltage Noise Voltage Noise Density
Current Noise Density
en p-p en
in
Specifications subject to change without notice.
VCM = –5 V to +5 V RL = 1 kΩ, –4.7 V ≤ VOUT ≤ 4.7 V
–5 56 20
IL = 10 mA Source IL = 10 mA Si.