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EL2228
Data Sheet July 29, 2002 FN7008
Dual Low Noise Amplifier
The EL2228 is a dual, low-noise amplifier, ideally suited to filtering applications in ADSL and HDSLII designs. It features low noise specification of just 4.9nV/Hz and 1.2pA/Hz, making it ideal for processing low voltage waveforms. The EL2228 has a -3dB bandwidth of 80MHz and is gain-of1 stable. It also affords minimal power dissipation with a supply current of just 4.5mA per amplifier. The amplifier can be powered from supplies ranging from 2.5V to 12V. The EL2228 is available in a space saving 8-pin MSOP package as well as the industry-standard 8-pin SO. It is specified for operation over the -40C to +85C temperature range.
Features
* Voltage noise of only 4.9nV/Hz * Current noise of only 1.2pA/Hz * Bandwidth (-3dB) of 80MHz -@ AV = +1 * Gain-of-1 stable * Just 4.5mA per amplifier * 8-pin MSOP package * 2.5V to 12V operation
Applications
* ADSL filters * HDSLII filters * Ultrasound input amplifiers
Ordering Information
PART NUMBER EL2228CY EL2228CY-T13 EL2228CY-T7 EL2228CS EL2228CS-T13 EL2228CS-T7 PACKAGE 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 8-Pin SO 8-Pin SO 8-Pin SO TAPE & REEL 13" 7" 13" 7" PKG. NO. MDP0043 MDP0043 MDP0043 MDP0027 MDP0027 MDP0027
* Wideband instrumentation * Communications equipment * Wideband sensors
Pinout
EL2228 (8-PIN SO, MSOP) TOP VIEW
VOUTA 1
8 VS+
VINA- 2
+
7 VOUTB
VINA+ 3
+
6 VINB-
VS- 4
5 VINB+
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL2228
Absolute Maximum Ratings (TA = 25C)
Supply Voltage between V S+ and VS-. . . . . . . . . . . . . . . . . . . .+28V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . VS- - 0.3V, V S +0.3V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 40mA ESD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +150C Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . -40C to +85C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER INPUT CHARACTERISTICS VOS TCVOS IB R IN C IN CMIR CMRR
VS+ = +12V, VS- = -12V, R L = 500 and C L = 3pF to 0V, R F = 420 and T A = 25C unless otherwise specified. CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Impedance Input Capacitance Common-Mode Input Range Common-Mode Rejection Ratio
VCM = 0V Measured over operating temperature range VCM = 0V -9
0.2 -4 -4.5 8 1 -11.8
3
mV V/C
-1
A M pF
+10.4 90 75 75 4.9 1.2
V dB dB dB nV/Hz pA/Hz
for V IN from -11.8V to +10.4V for V IN from -10V to +10V
60 60 60
AVOL eN iN
Open-Loop Gain Voltage Noise Current Noise
-5V VOUT 5V f = 100kHz f = 100kHz
OUTPUT CHARACTERISTICS VOL Output Swing Low RL = 500 RL = 250 VOH Output Swing High RL = 500 RL = 250 ISC Short Circuit Current RL = 10 10 9.5 140 -10.3 -9.5 10.3 10 180 -10 -9 V V V V mA
POWER SUPPLY PERFORMANCE PSRR IS Power Supply Rejection Ratio Supply Current (per Amplifier) VS is moved from 10.8V to 13.2V No load 65 4 83 5 6 dB mA
DYNAMIC PERFORMANCE SR tS BW HD2 Slew Rate (Note 1) Settling to +0.1% (AV = +1) -3dB Bandwidth 2nd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, AV = 2 f = 1MHz, VO = 2VP-P, RL = 150, AV = 2 HD3 3rd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, AV = 2 f = 1MHz, VO = 2VP-P, RL = 150, AV = 2 NOTE: 1. Slew rate is measured on rising and falling edges 2.5V square wave, measured 25%-75% (A V = +1), VO = 2V step 44 65 50 80 -86 -79 -93 -70 V/s ns MHz dBc dBc dBc dBc
2
EL2228
Electrical Specifications
PARAMETER INPUT CHARACTERISTICS VOS TCVOS IB R IN C IN CMIR CMRR Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Impedance Input Capacitance Common-Mode Input Range Common-Mode Rejection Ratio for V IN from -4.7V to +3.4V for V IN from -2V to +2V AVOL eN iN Open-Loop Gain Voltage Noise Current Noise -2.5V VOUT 2.5V f = 100kHz f = 100kHz 60 72 4.7 1.2 -4.7 60 90 VCM = 0V Measured over operating temperature range VCM = 0V -9 0.6 4.9 -4.5 6 1.2 +3.4 -1 3 mV V/C A M pF V dB dB dB nV/Hz pA/Hz VS+ = +5V, V S- = -5V, RL = 500 and CL = 3pF to 0V, RF = 420 and T A = 25C unless otherwise specified. CONDITIONS MIN TYP MAX UNIT
DESCRIPTION
OUTPUT CHARACTERISTICS VOL Output Swing Low RL = 500 RL = 250 VOH Output Swing High RL = 500 RL = 250 ISC Short Circuit Current RL = 10 3.5 3.5 60 -3.8 -3.7 3.7 3.6 100 -3.5 -3.5 V V V V mA
POWER SUPPLY PERFORMANCE PSRR IS Power Supply Rejection Ratio Supply Current (Per Amplifier) VS is moved from 4.5V to 5.5V No load 65 3.5 83 4.5 5.5 dB mA
DYNAMIC PERFORMANCE SR tS BW HD2 Slew Rate (Note 1) Settling to +0.1% (AV = +1) -3dB Bandwidth 2nd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, AV = 2 f = 1MHz, VO = 2VP-P, RL = 150, AV = 2 HD3 3rd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, AV = 2 f = 1MHz, VO = 2VP-P, RL = 150, AV = 2 NOTE: 1. Slew rate is measured on rising and falling edges 2.5V square wave, measured 25%-75% (A V = +1), VO = 2V step 35 50 50 75 -90 -71 -99 -69 V/s ns MHz dBc dBc dBc dBc
3
EL2228 Typical Performance Curves
Non-Inverting Frequency Response for Various RF 4 3 Normalized Gain (dB) Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 VS = 12V AV = +1 RL = 500 1M 10M Frequency (Hz) 100M RF=0 RF=200 RF = 1k RF = 420 4 3 2 1 0 -1 -2 -3 -4 -5 -6 1M VS = 12V AV = -1 RL = 500 10M Frequency (Hz) 100M RF = 1k RF = 100 R F = 420 Inverting Frequency Response for Various RF
-6 100k
Non-Inverting Frequency Response (Gain) 4 3 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 -6 100k 1M 10M Frequency (Hz) 100M AV = 5 AV = 10 VS=12V RF=420 RL=500 AV = 1 AV = 2 4 3 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5
Inverting Frequency Response (Gain) VS = 12V RF = 420
AV = -1 AV = -10 AV = -5 AV = -2
-6 100k
1M
10M Frequency (Hz)
100M
Non-Inverting Frequency Response (Phase) 135 90 45 0 Phase () -45 -90 -135 -180 -225 -270 VS=12 VS = 12V V F = 420 R RF=420 RL = 500 1M 10M Frequency (Hz) 100M AV =5 AV= 5 AV=10 10 AV = AV = 1 AV=1 AV = 2 AV=2 Phase () 135 90 45 0 -45 -90 -135 -180 -225 -270
Inverting Frequency Response (Phase)
AV = -1 AV = -2 AV = -5 AV = -10 VS = 12V RF = 420 RL = 500 1M 10M Frequency (Hz) 100M
-315 100k
-315 100k
Non-Inverting Frequency Response for Various Input Signal Levels 4 3 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 -6 100k VIN = 500mV PP 1M 10M Frequency (Hz) 100M VIN = 2VPP VIN = 1VPP VS = 12V RF = 420 RL = 500 AV = +1 VIN = 100mVPP 4 3 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5
Non-Inverting Frequency Response for Various RL
RL = 1k RL = 50 RL = 150 VS = 12V A V = +1 R F = 420 1M RL = 500
-6 100k
10M Frequency (Hz)
100M
4
EL2228 Typical Performance Curves
(Continued)
Non-Inverting Frequency Response for Various Output DC Levels 4 3 Normalized Gain (dB) CL = 30pF 2 1 0 -1 -2 -3 -4 -5 1M 10M Frequency (Hz) 100M VS = 12V RF = 420 RL = 500 AV = +1 1M VO = +5= VO VO = -5 10M Frequency (Hz) 100M VO = 0 VO = -10 VO = +10
Non-Inverting Frequency Response for Various CL 4 3 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 VS = 12V RF = 420 RL = 500 AV = +1 CL = 10pF CL = 3pF
-6 100k
-6 100k
-3dB Bandwidth vs Supply Voltage for Noninverting Gains 80 G=1 -3dB Bandwidth (MHz) 60 VS = 12V RF = 420 RL = 500 AV = +1 25
-3dB Bandwidth vs Supply Voltage for Inverting Gains G = -1 -3dB Bandwidth (MHz) 20 VS = 12V R F = 420 R L = 500 A V = +1
15
G = -2
40 G=2 20 G=5 0 2.5 G = 10
10
G = -5 G = -10
5
4.5
6.5
8.5
10.5
12.5
0 2.5
4.5
6.5
8.5
10.5
12.5
Supply Voltage (V)
Supply Voltage (V)
Peaking vs Supply Voltage for Non-inverting Gains 1 VS = 12V RF = 420 RL = 500 AV = +1 Peaking (dB) 0.2
Peaking vs Supply Voltage for Inverting Gains VS = 12V RF = 420 RL = 500 AV = +1 G = -1
0.8 Peaking (dB) G=1 0.6
0.16
0.12
0.4
0.08 G = -2 G = -10
0.2
G=2 G = 10
0.04
0 2.5
4.5
6.5
8.5
10.5
12.5
0 2.5
4.5
6.5
8.5
10.5
12.5
Supply Voltage (V) Small Signal Step Response VS = 12V RF = 420 AV = 1 RL= 500
Supply Voltage (V) Small Signal Step Response VS = 2.5V RF = 420 AV = 1 RL = 500
20mV/div
20mV/div
50ns/div
50ns/div
5
EL2228 Typical Performance Curves
Large Signal Step Response VS = 12V RF = 420 AV = 1 RL = 500
(Continued)
Large Signal Step Response VS = 2.5V RF = 420 AV = 1 RL= 500
0.5V/div
0.5V/div
50ns/div
50ns/div
Group Delay vs Frequency 20 16 12 Group Delay (ns) 8 4 0 -4 -8 -12 -16 -20 1M VS = 12V RF = 420 AV = 1 RL = 500 10M Frequency (Hz) 100M 200M AV = 1 AV = 2 dG (%) or dP () 0.1 0.05 0 -0.05 -0.1 0.2 0.15
Differential Gain/Phase vs DC Input Voltage at 3.58MHz VS = 12V RF = 420 RL = 150 AV = 2 dP
dG
-0.15 -1
-0.5
0 DC Input Voltage (V)
0.5
1
Supply Current vs Supply Voltage 13.2 12 10.8 Output Impedance () Supply Current (mA) 9.6 8.4 7.2 6 4.8 3.6 2.4 1.2 0 0 1.4 2.8 4.2 5.6 7 8.4 9.8 11.2 12.6 14 VS (V) CMRR vs Frequency 100 10 10 100
Closed Loop Output Impedance vs Frequency
1
0.1
0.01 10k
100k
1M Frequency (Hz)
10M
100M
PSRR vs Frequency
80 CMRR (dB) PSRR (dB)
-10
60
-30 VS-50 VS+
40
20 VS = 12 100 1k 10k 100k 1M 10M 100M
-70
0 10
-90 1k
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
6
EL2228 Typical Performance Curves
(Continued)
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing (VS = 2.5V)
-40 -50
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing (VS = 12V)
-50 -60
2ndHD Distortion (dB) -60 3rdHD -70 -80 -90 -100 0 4 8 12 16 20 Output Swing (V PP) Distortion (dB) -70 3rdHD -80 -90 -100 -110 0 0.5 1 1.5 2 2.5 Output Swing (V PP) 2ndHD
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing (Single-Ended) -50 -60 Distortion (dBc) Distortion (dBc) -70 -80 -90 -100 -110 -120 0 4 8 12 16 20 Output Swing (V PP) VS = 12V AV = 2 RF = 420 3rdHD 2ndHD -50 -60 -70 -80 -90 -100 -110
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing (Single-Ended) VS = 2.5V AV = 2 R F = 420 2ndHD
3rdHD
0
0.5
1
1.5
2
2.5
Output Swing (V PP)
Voltage and Current Noise vs Frequency Voltage Noise (nVHz), Current Noise 18 16 14 Isolation (dB) 12 10 8 6 4 2 0 10 100 IN EN -20 0
Channel to Channel Isolation vs Frequency
AB
-40 BC -60
-80
1k Frequency (Hz)
10k
100k
-100 100k
1M
10M Frequency (Hz)
100M
11
Supply Current vs Temperature VS = 12V
100
3dB Bandwidth vs Temperature VS = 5V
90 Supply Current (mA) 10 Bandwidth (MHz) 0 50 100 150
80
70
9
60
0 -50
50 -40
10
60
110
160
Junction Temperature (mA)
Junction Temperature (C)
7
EL2228 Typical Performance Curves
(Continued)
Input Bias Current vs Temperature -2 2
Input Offset Voltage vs Temperature
Input Offset Voltage (mV) 0 50 100 150
Input Bias Current (A)
1
-4
0
-6
-1
-8 -50
-2 -50
0
50
100
150
Junction Temperature (C)
Junction Temperature (C) Package Power Dissipation vs Ambient Temperature JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board
Slew Rate vs Temperature 76 74 Slew Rate (V/s) 72 70 68 66 64 62 -50 Power Dissipation (W) 0.7
0.6 625mW 0.5 486mW 0.4 0.3 0.2 0.1 0 0 50 Temperature (C) Package Power Dissipation vs Ambient Temperature JEDEC JESD51-7 High Effective Thermal Conductivity Test Board 100 150 0 25 50 75 85 100 125 150 Ambient Temperature (C) MSOP8 206C/W SO8 160C/W
1.4 1.2 Power Dissipation (W)
1 909mW 0.8 870mW 0.6 0.4 0.2 0 0 25 50 75 100 125 150 Ambient Temperature (C) MSOP8 115C/W SO8 110C/W
8
EL2228 Pin Descriptions
8-PIN MSOP 1 8-PIN SO 1 PIN NAME VOUTA PIN FUNCTION Output EQUIVALENT CIRCUIT
VS+
VOUT
CIRCUIT 1 2 2 VINAInput
VS+
VIN +
VIN-
VS-
CIRCUIT 2 3 4 5 6 7 8 3 4 5 6 7 8 VINA+ VSVINB+ VINBVOUTB VS+ Input Supply Input Input Output Supply Reference Circuit 2 Reference Circuit 1 Reference Circuit 2
Applications Information
Product Description
The EL2228 is a dual voltage feedback operational amplifier designed especially for DMT ADSL and other applications requiring very low voltage and current noise. It also features low distortion while drawing moderately low supply current and is built on Elantec's proprietary high-speed complementary bipolar process. The EL2228 uses a classical voltage-feedback topology which allows them to be used in a variety of applications where current-feedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier. The conventional topology of the EL2228 allows, for example, a capacitor to be placed in the feedback path, making it an excellent choice for applications such as active filters, sample-and-holds, or integrators.
excellent choice for single-supply operation. Using a single positive supply, the lower input voltage range is within 300mV of ground (RL = 500), and the lower output voltage range is within 875mV of ground. Upper input voltage range reaches 3.6V, and output voltage range reaches 3.8V with a 5V supply and RL = 500. This results in a 2.625V output swing on a single 5V supply. This wide output voltage range also allows single-supply operation with a supply voltage as high as 28V.
Gain-Bandwidth Product and the -3dB Bandwidth
The EL2228 has a gain-bandwidth product of 40MHz while using only 5mA of supply current per amplifier. For gains greater than 1, their closed-loop -3dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. For gains of 1, higher-order poles in the amplifiers' transfer function contribute to even higher closed loop bandwidths. For example, the EL2228 have a -3dB bandwidth of 80MHz at a gain of 1, dropping to 9MHz at a gain of 5. It is important to note that the EL2228 is designed so that this "extra" bandwidth in low-gain
Single-Supply Operation
The EL2228 was designed to have a wide input and output voltage range. This design also makes the EL2228 an
9
EL2228
application does not come at the expense of stability. As seen in the typical performance curves, the EL2228 in a gain of only 1 exhibited 0.5dB of peaking with a 500 load. where: * TMAX = Maximum ambient temperature * JA = Thermal resistance of the package * PDMAX = Maximum power dissipation of 1 amplifier * VS = Supply voltage * IMAX = Maximum supply current of 1 amplifier * VOUTMAX = Maximum output voltage swing of the application * RL = Load resistance
Output Drive Capability
The EL2228 is designed to drive a low impedance load. It can easily drive 6VP-P signal into a 500 load. This high output drive capability makes the EL2228 an ideal choice for RF, IF, and video applications. Furthermore, the EL2228 is current-limited at the output, allowing it to withstand momentary short to ground. However, the power dissipation with output-shorted cannot exceed the power dissipation capability of the package.
Driving Cables and Capacitive Loads
Although the EL2228 is designed to drive low impedance load, capacitive loads will decreases the amplifier's phase margin. As shown in the performance curves, capacitive load can result in peaking, overshoot and possible oscillation. For optimum AC performance, capacitive loads should be reduced as much as possible or isolated with a series resistor between 5 to 20. When driving coaxial cables, double termination is always recommended for reflection-free performance. When properly terminated, the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier.
Power Supply Bypassing And Printed Circuit Board Layout
As with any high frequency devices, good printed circuit board layout is essential for optimum performance. Ground plane construction is highly recommended. Pin lengths should be kept as short as possible. The power supply pins must be closely bypassed to reduce the risk of oscillation. The combination of a 4.7F tantalum capacitor in parallel with 0.1F ceramic capacitor has been proven to work well when placed at each supply pin. For single supply operation, where pin 4 (VS-) is connected to the ground plane, a single 4.7F tantalum capacitor in parallel with a 0.1F ceramic capacitor across pin 8 (VS+). For good AC performance, parasitic capacitance should be kept to a minimum. Ground plane construction again should be used. Small chip resistors are recommended to minimize series inductance. Use of sockets should be avoided since they add parasitic inductance and capacitance which will result in additional peaking and overshoot.
Power Dissipation
With the wide power supply range and large output drive capability of the EL2228, it is possible to exceed the 150C maximum junction temperatures under certain load and power-supply conditions. It is therefore important to calculate the maximum junction temperature (T JMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified for the EL2228 to remain in the safe operating area. These parameters are related as follows:
T JMAX = T MAX + ( JA xPDMAXTOTAL )
where: * PDMAXTOTAL is the sum of the maximum power dissipation of each amplifier in the package (PDMAX) * PDMAX for each amplifier can be calculated as follows:
VOUTMAX PD MAX = 2*VS x I SMAX + ( VS - VOUTMAX ) x ---------------------------R
L
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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