EC5420AI-G [E-CMOS]
High Slew Rate Rail-to-Rail Quad Operational Amplifiers;
| 型号： | EC5420AI-G |
| 厂家： | 
E-CMOS Corporation |
| 描述： | High Slew Rate Rail-to-Rail Quad Operational Amplifiers |
| 文件： | 总10页 (文件大小：592K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Features
Introduction
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Wide supply voltage range 4.5V ~ 18V
(General Description)
Input range 500mV beyond the rails
Unity-gain stable
The EC5420A is a 30mA output current rail-to-rail
quad channels operational amplifier with wide supply
range from 4.5V to 18V while consumes only 750uA
per channel. It provides 0.5V beyond the supply rails
of common mode input range and capability of
rail-to-rail output swing as well. This enables the
amplifier to offer maximum dynamic range at any
supply voltage among many applications. A 8MHz
gain bandwidth product allows EC5420A to perform
more stable than other devices in Internet
applications.
Rail-to-rail output swing
High slew rate 20V/μs
GBWP 8 MHz
12 MHz -3dB Bandwidth
Ultra-small Package TSSOP-14
PIN ASSIGNMENT
With features of 20V/μs high slew rate and 200ns of
fast settling time, as well as 30mA (sink and source)
of high output driving capability, the EC5420A is ideal
for the requirements of flat panel Thin Film Transistor
Liquid Crystal Displays (TFT-LCD) panel reference
buffers application. Due to insensitive to power supply
variation, EC5420A offers flexibility of use in multitude
of applications such as battery power, portable
devices and anywhere low power consumption is
concerned. With standard operational amplifier pin
assignment, the EC5420A is offered in space saving
14-Pin TSSOP package and specified over the -20°C
to +85°C temperature range.
Applications
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TFT-LCD Reference Driver
Touch-Screen Display
Wireless LANs
Personal Communication Devices
Direct Access Arrangement
Personal Digital Assistant (PDA)
Active Filter
Sampling ADC Amplifier
ADC/DAC Buffer
Electronic Notebook
Office Automation
E-CMOS Corp. (www.ecmos.com.tw)
Page 1 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Absolute maximum ratings (TA = 25 °C)
Values beyond absolute maximum ratings may cause permanent damage to the device. These are stress
ratings only; functional device operation is not implied. Exposure to AMR conditions for extended periods
may affect device reliability.
Supply Voltage between VS+ and VS-
Input Voltage
+18V
Storage Temperature
Operating Temperature
Lead Temperature
ESD Voltage
-65°C to +150°C
-20°C to +85°C
260°C
VS--0.5V, VS ++0.5V
Maximum Continuous Output Current
Maximum Die Temperature
30mA
+125°C
2KV
Important Note:
All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless
otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Ordering Information
PART NUMBER
EC5420AI-F
TOP MARK
EC5420A-F
EC5420A-G
5420A-HG
PACKAGE
Lead free 14-pin TSSOP
EC5420AI-G
EC5420AI-HG
Green mode TSSOP-14
Green mode TSSOP-14 ( Exposed Pad )
E-CMOS Corp. (www.ecmos.com.tw)
Page 2 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Electrical Characteristics
(Typical Performance Characteristics)
VS+= +5V, VS - = -5V, RL = 10kΩ and CL = 10pF to 0V, TA = 25°C unless otherwise specified.
Parameter
Description
Condition
Min
Typ
Max
Units
Input Characteristics
VOS
Input Offset Voltage
VCM= 0V
[1]
2
5
12
mV
µV/°C
nA
TCVOS
IB
Average Offset Voltage Drift
Input Bias Current
VCM= 0V
2
50
RIN
Input Impedance
1
GΩꢀ
pF
CIN
Input Capacitance
1.35
CMIR
CMRR
AVOL
Common-Mode Input Range
Common-Mode Rejection Ratio
Open-Loop Gain
-0.5
50
+5.5
V
for VIN from -0.5V to 5.5V
70
90
dB
75
dB
0.5V ≤VOUT≤4.5V
Output Characteristics
VOL
VOH
ISC
Output Swing Low
IL=-5mA
IL=5mA
-4.92
4.92
±150
±30
-4.85
V
V
Output Swing High
Short Circuit Current
Output Current
4.85
mA
mA
IOUT
Power Supply Performance
PSRR
Power Supply Rejection Ratio
VS is moved from ±2.25V to
±7.75V
60
80
750
20
dB
uA
IS
Supply Current (Per Amplifier)
No Load
1000
Dynamic Performance
SR
Slew Rate [2]
13
V/µs
-4.0V ≤VOUT≤4.0V,
20% to 80%
tS
Settling to +0.1% (AV = +1)
-3dB Bandwidth
(AV = +1), VO=2V Step
RL = 10kꢀ, CL=10pF
RL = 10kꢀ, CL=10pF
RL = 10kꢀ, CL = 10 pF
f = 5 MHz
200
12
8
ns
MHz
BW
GBWP
PM
CS
Gain-Bandwidth Product
Phase Margin
MHz
50
75
Degrees
dB
Channel Separation
1. Measured over operating temperature range
2. Slew rate is measured on rising and falling edges
E-CMOS Corp. (www.ecmos.com.tw)
Page 3 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Typical Performance Characteristics
1750
1500
1250
1000
750
500
250
0
-15 -13 -11 -9 -7 -5 -3 -1
1 3 5 7 9 11 13 15
Input Offset(mV)
Figure (a) Input Offset Voltage Distribution
Figure (b) Rail to Rail Capability
Figure (c) Input Beyond the Rails Signal
Figure (d) Large Signal Transient Response
Figure (e) Large Signal Transient Response
E-CMOS Corp. (www.ecmos.com.tw)
Page 4 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
RL=10KΩ
Av = 1
Figure (f) Open Loop Gain & Phase vs. Frequency
Figure (g) Frequency Response for Various CL
CL=10 pF
Av = 1
Figure (h) Frequency Response for Various RL
E-CMOS Corp. (www.ecmos.com.tw)
Page 5 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Applications Information
Product Description
The EC5420A rail-to-rail quad channels amplifier is built on an advanced high voltage CMOS process. It’s beyond rails
input capability and full swing of output range made itself an ideal amplifier for use in a wide range of general-purpose
applications. The features of 20V/µS high slew rate, fast settling time, 8MHz of GBWP as well as high output driving
capability have proven the EC5420A a good voltage reference buffer for TFT-LCD for applications. High phase margin
make the EC5420A ideal for Connected in voltage follower mode for high drive applications
Supply Voltage, Input Range and Output Swing
The EC5420A can be operated with a single nominal wide supply voltage ranging from 4.5V to 18V with stable
performance over operating temperatures of -20 °C to +85 °C.
With 500mV greater than rail-to-rail input common mode voltage range and 80dB of Common Mode Rejection Ratio,
the EC5420A allows a wide range sensing among many applications without having any concerns over exceeding the
range and no compromise in accuracy. The output swings of the EC5420A typically extend to within 80mV of positive
and negative supply rails with load currents of 5mA. The output voltage swing can be even closer to the supply rails by
merely decreasing the load current. Figure 1 shows the input and output waveforms for the device in the unity-gain
configuration. The amplifier is operated under ±5V supply with a 10kꢀload connected to GND. The input is a 10Vp-p
sinusoid. An approximately 9.985 Vp-p of output voltage swing can be easily achieved.
Figure 1. Operation with Rail-to-Rail Input and Output
Output Short Circuit Current Limit
A +/-150mA short circuit current will be limited by the EC5420A if the output is directly shorted to the positive or the
negative supply. For an indefinitely output short circuit, the power dissipation could easily increase such that the device
may be damaged. The internal metal interconnections are well designed to prevent the output continuous current from
exceeding +/-30 mA such that the maximum reliability can be well maintained.
E-CMOS Corp. (www.ecmos.com.tw)
Page 6 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Output Phase Reversal
The EC5420A is designed to prevent its output from being phase reversal as long as the input voltage is limited from
VS-－0.5V to VS+ ＋0.5V. Figure 2 shows a photo of the device output with its input voltage driven beyond the supply
rails. Although the phase of the device's output will not be reversed, the input's over-voltage should be avoided. An
improper input voltage exceeds supply range by more than 0.6V may result in an over stress damage.
Figure 2. Operation with Beyond-the Rails Input
Power Dissipation
The EC5420A is designed for maximum output current capability. Even though momentary output shorted to ground
causes little damage to the device.
For the high drive amplifier EC5420A, it is possible to exceed the 'absolute-maximum junction temperature' under
certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for the
application to determine if load conditions need to be modified for the amplifier to remain in the safe operating area.
The maximum power dissipation allowed in a package is determined according to:
TJmax -TAmax
PDmax
=
ΘJA
Where:
T
Jmax = Maximum Junction Temperature
Amax= Maximum Ambient Temperature
T
ꢀJA = Thermal Resistance of the Package
Dmax = Maximum Power Dissipation in the Package.
P
The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the loads, or:
P
Dmax =ꢀi[VS * ISmax + (VS+ – VO) * IL]
When sourcing, and
Dmax = ꢀi[VS * ISmax + (VO – VS-) * IL]
P
When sinking.
E-CMOS Corp. (www.ecmos.com.tw)
Page 7 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Where:
i = 1 to 4
VS = Total Supply Voltage
ISmax = Maximum Supply Current Per Amplifier
VO = Maximum Output Voltage of the Application
IL= Load current
RL= Load Resistance = (VS+ – VO)/IL = (VO – VS-)/ IL
A calculation for RL to prevent device from overheat can be easily solved by setting the two PDmax equations
equal to each other.
PIN
Θ j a
Θ j c
( ℃/W )
( ℃/W )
Count
TSSOP14
100
60
33
16
Normal
TSSOP14
EXPOSED PAD
Driving Capacitive Loads
The EC5420A is designed to drive a wide range of capacitive loads. In addition, the output current handling capability
of the device allows for good slewing characteristics even with large capacitive loads. The combination of these
features make the EC5420A ideally for applications such as TFT LCD panel buffers, ADC input amplifiers, etc.
As load capacitance increases, however, the -3dB bandwidth of the device will decrease and the peaking increase.
The amplifiers drive 10pF loads in parallel with 10 kꢀ with just 1.5dB of peaking, and 100pF with 6.4dB of peaking. If
less peaking is desired in these applications, a small series resistor (usually between 5 ꢀand 50 ꢀ) can be placed in
series with the output. However, this will obviously reduce the gain slightly. Another method of reducing peaking is to
add a "snubber" circuit at the output. A snubber is a shunt load consisting of a resistor in series with a capacitor. Values
of 150ꢀand 10nF are typical. The advantage of a snubber is that it improves the settling and overshooting
performance while does not draw any DC load current or reduce the gain.
E-CMOS Corp. (www.ecmos.com.tw)
Page 8 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Power Supply Bypassing and Printed Circuit Board Layout
With high phase margin, the EC5420A performs stable gain at high frequency. Like any high-frequency device, good
layout of the printed circuit board usually comes with optimum performance. Ground plane construction is highly
recommended, lead lengths should be as short as possible and the power supply pins must be well bypassed to
reduce the risk of oscillation. For normal single supply operation, where the VS- pin is connected to ground, a 0.1 µF
ceramic capacitor should be placed from VS+ pin to VS- pin as a bypassing capacitor. A 4.7µF tantalum capacitor should
then be connected in parallel, placed in the region of the amplifier. One 4.7µF capacitor may be used for multiple
devices. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be
used.
Layout arragement
LEAD POSITION OVERLAY FOR TSSOP-14 ( millimeters )
E-CMOS Corp. (www.ecmos.com.tw)
Page 9 of 10
Revision 2008/12/25
EC5420A
High Slew Rate Rail-to-Rail
Quad Operational Amplifiers
Outline Dimensions (Dimensions shown in millimeters)
TSSOP (Thin-Shrink Small Outline Package)
5.0 ± 0.10
0.09 - 0. 20
2.23 ± 0.31
EXPOSED PAD DIMENSION
0.65Typ
0° - 8°
0.6± 0.10
0.19 -0.30 Typ
0.10 ± 0.05
E-CMOS Corp. (www.ecmos.com.tw)
Page 10 of 10
Revision 2008/12/25
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