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EL2227
Data Sheet June 23, 2004 FN7058.1
Dual Very Low Noise Amplifier
The EL2227 is a dual, low-noise amplifier, ideally suited to line receiving applications in ADSL and HDSLII designs. With low noise specification of just 1.9nV/Hz and 1.2pA/Hz, the EL2227 is perfect for the detection of very low amplitude signals. The EL2227 features a -3dB bandwidth of 115MHz and is gain-of-2 stable. The EL2227 also affords minimal power dissipation with a supply current of just 4.8mA per amplifier. The amplifier can be powered from supplies ranging from 2.5V to 12V. The EL2227 is available in a space-saving 8-pin MSOP package as well as the industry-standard 8-pin SO. It can operate over the -40C to +85C temperature range.
Features
* Voltage noise of only 1.9nV/Hz * Current noise of only 1.2pA/Hz * Bandwidth (-3dB) of 115MHz @AV = +2 * Gain-of-2 stable * Just 4.8mA per amplifier * 8-pin MSOP package * 2.5V to 12V operation * Pb-free available
Applications
* ADSL receivers * HDSLII receivers
Ordering Information
PART NUMBER EL2227CY EL2227CY-T13 EL2227CY-T7 EL2227CS EL2227CS-T13 EL2227CS-T7 EL2227CSZ (See Note) EL2227CSZ-T13 (See Note) EL2227CSZ-T7 (See Note) PACKAGE 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 8-Pin SO 8-Pin SO 8-Pin SO 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) 8-Pin SO (Pb-free) TAPE & REEL 13" 7" 13" 7" 13" 7" PKG. DWG.# MDP0043 MDP0043 MDP0043 MDP0027 MDP0027 MDP0027 MDP0027
* Ultrasound input amplifiers * Wideband instrumentation * Communications equipment * AGC & PLL active filters * Wideband sensors
Pinout
EL2227 (8-PIN SO, MSOP) TOP VIEW
VOUTA
1 2 3 4 + +
8 7 6 5
VS+ VOUTB VINBVINB+
MDP0027
VINA-
MDP0027
VINA+ VS-
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
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) 2001 Elantec Semiconductor Inc. 2003-2004 Intersil Americas Inc. . All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
1
EL2227
Absolute Maximum Ratings (TA = 25C)
Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . .28V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . VS- - 0.3V, VS +0.3V Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 40mA Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves ESD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
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. 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
Electrical Specifications
PARAMETER INPUT CHARACTERISTICS VOS TCVOS IB RIN CIN CMIR CMRR AVOL eN iN
VS+ = +12V, VS- = -12V, RL = 500 and CL = 3pF to 0V, RF = RG = 620, and TA = 25C unless otherwise specified. DESCRIPTION CONDITION MIN TYP MAX UNIT
Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Impedance Input Capacitance Common-Mode Input Range Common-Mode Rejection Ratio Open-Loop Gain Voltage Noise Current Noise
VCM = 0V
-0.2 -0.6
3
mV V/C A M pF
VCM = 0V
-9
-3.4 7.3 1.6
-11.8 for VIN from -11.8V to 10.4V -5V VOUT 5V f = 100kHz f = 100kHz 60 70 94 87 1.9 1.2
+10.4
V dB dB nV/Hz pA/Hz
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 -10.4 -9.8 10.4 10 180 -10 -9 V V V V mA
POWER SUPPLY PERFORMANCE PSRR IS VS Power Supply Rejection Ratio Supply Current (Per Amplifier) Operating Range VS is moved from 2.25V to 12V No Load 2.5 65 95 4.8 6.5 12 dB mA V
DYNAMIC PERFORMANCE SR tS BW HD2 Slew Rate (Note 2) Settling to 0.1% (AV = +2) -3dB Bandwidth 2nd Harmonic Distortion 2.5V square wave, measured 25%-75% (AV = +2), VO = 1V RF = 358 f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 HD3 3rd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 40 50 65 115 93 83 94 76 V/S ns MHz dBc dBc dBc dBc
2
EL2227
Electrical Specifications
PARAMETER INPUT CHARACTERISTICS VOS TCVOS IB RIN CIN CMIR CMRR AVOL eN iN Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Impedance Input Capacitance Common-Mode Input Range Common-Mode Rejection Ratio Open-Loop Gain Voltage Noise Current Noise for VIN from -4.8V to 3.4V -5V VOUT 5V f = 100kHz f = 100kHz -4.8 60 70 97 84 1.9 1.2 VCM = 0V -9 VCM = 0V 0.2 -0.6 -3.7 7.3 1.6 3.4 3 mV V/C A M pF V dB dB nV/Hz pA/Hz VS+ = +12V, VS- = -12V, RL = 500 and CL = 3pF to 0V, RF = RG = 620, and TA = 25C unless otherwise specified. DESCRIPTION CONDITION MIN TYP MAX UNIT
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 VS Power Supply Rejection Ratio Supply Current (Per Amplifier) Operating Range VS is moved from 2.25V to 12V No Load 2.5 65 95 4.5 5.5 12 dB mA V
DYNAMIC PERFORMANCE SR tS BW HD2 Slew Rate Settling to 0.1% (AV = +2) -3dB Bandwidth 2nd Harmonic Distortion 2.5V square wave, measured 25%-75% (AV = +2), VO = 1V RF = 358 f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 HD3 3rd Harmonic Distortion f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 35 45 77 90 98 90 94 79 V/S ns MHz dBc dBc dBc dBc
3
EL2227 Typical Performance Curves
Non-inverting Frequency Response for Various RF 4 3 Normalized Gain (dB) RF=1k RF=620 Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 -6 1M VS=12V AV=+2 RL=500 10M Frequency (Hz) Non-inverting Frequency Response (Gain) 4 3 Normalized Gain (dB) Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 -6 1M VS=12V RF=350 RL=500 10M Frequency (Hz) Non-inverting Frequency Response (Phase) 135 90 45 0 Phase () -45 -90 -135 -180 -225 -270 -315 1M VS=12 RF=350 RL=500 10M Frequency (Hz) 100M 200M AV=10 AV=5 AV=2 Phase () 135 90 45 0 -45 -90 -135 -180 -225 -270 -315 1M VS=12V RF=420 RL=500 10M Frequency (Hz) 100M 200M AV=-5 AV=-10 AV=-1 AV=-2 100M 200M AV=10 AV=5 AV=2 4 3 2 1 0 -1 -2 -3 -4 -5 -6 1M VS=12V RF=420 RL=500 10M Frequency (Hz) Inverting Frequency Response (Phase) 100M 200M AV=-5 AV=-10 AV=-2 AV=-1 100M 200M RF=100 RF=350 4 3 2 1 0 -1 -2 -3 -4 -5 -6 1M VS=12V AV=-1 RL=500 10M Frequency (Hz) Inverting Frequency Response (Gain) RF=1k RF=420 RF=620 RF=100 RF=350 Inverting Frequency Response for Various RF
100M 200M
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=2VPP VIN=1VPP VIN=500mVPP VS=12V RF=350 AV=+2 RL=500 4 3 Normalized Gain (dB) VIN=20mVPP 2 1 0 -1 -2 -3 -4 -5 10M Frequency (Hz) 100M
Inverting Frequency Response for Various Input Signal Levels
VIN=100mVPP
VIN=1.4VPP
VIN=20mVPP
VIN=2.8VPP VIN=280mVPP VS=12V RF=420 RL=500 AV=-1 10M Frequency (Hz) 100M 200M
1M
-6 1M
4
EL2227 Typical Performance Curves
(Continued)
Inverting Frequency Response for Various CL 4 CL=30pF CL=12pF Normalized Gain (dB) 3 2 1 0 -1 -2 -3 -4 -5 10M Frequency (Hz) Non-inverting Frequency Response for Various RL 4 3 Normalized Gain (dB) Normalized Gain (dB) 2 1 0 -1 -2 -3 -4 -5 -6 1M VS=12V RF=620 CL=15pF AV=+2 10M Frequency (Hz) 100M 200M RL=50 RL=100 RL=500 4 3 2 1 0 -1 -2 -3 -4 -5 VS=12V RF=620 RL=500 AV=+2 1M VO=0V VO=-5V VO=+10V VO=-10V VO=+5V 100M 200M -6 1M VS=12V RF=420 RL=500 AV=-1 10M Frequency (Hz) Frequency Response for Various Output DC Levels 100M 200M CL=2pF CL=12pF CL=30pF
Non-inverting Frequency Response for Various CL 5 4 Normalized Gain (dB) 3 2 1 0 -1 -2 -3 -4 -5 1M VS=12 VS=12V V F=620 R RF=620 RL=500 V=+2 A CL=2pF
-6 100k
10M Frequency (Hz)
100M
3dB Bandwidth vs Supply Voltage 140 120 3dB Bandwidth (MHz) 100 Peaking (dB) 80 60 40 A =+5 V 20 0 2 4 6 8 10 Supply Voltage (V) AV=-10 12 AV=-5 AV=+2 AV=-2 AV=+2 RF=620 RL=500 AV=-1 4 3.5 3 2.5 2 1.5 1 0.5 0
Peaking vs Supply Voltage AV=+2 RF=620 RL=500
AV=+2
AV=-1 AV=+1 AV=-10 AV=+5 AV=-5
AV=+10
AV=-2
2
4
6
8
10
12
Supply Voltage (V)
Large Signal Step Response VS=12V RF=620 AV=2 RL=500
Large Signal Step Response VS=2.5V RF=620 AV=2 RL=500
0.5V/div
0.5V/div
100ns/div
100ns/div
5
EL2227 Typical Performance Curves
(Continued)
Small Signal Step Response VS=2.5V RF=620 AV=2 RL=500 RF=620 AV=2 RL=500
Small Signal Step Response VS=12V
20mV/div
20mV/div
100ns/div
100ns/div
Group Delay vs Frequency 10 8 6 Group Delay (ns) 4 2 0 -2 -4 -6 -8 -10 1M 10M Frequency (Hz) Supply Current vs Supply Voltage 12 100 VS=12V RF=620 RL=500 PIN=-20dBm into 50 100M AV=2V AV=5V dG (%) or dP () 0.08 0.06 0.04 0.02 0 0.1
Differential Gain/Phase vs DC Input Voltage at 3.58MHz
dP
AV=2 RF=620 RL=150 fO=3.58MHz
dG -0.5 0 DC Input Voltage (V) 0.5 1
-0.02 -1
Closed Loop Output Impedance vs Frequency
Output Impedance ()
Supply Current (mA)
1.2/div
10
6
1
0.1
1.2/div 0 0 6 Supply Voltage (V) CMRR 110 0 PSRR 12 0.01 10k 100k 1M Frequency (Hz) 10M 100M
90 -CMRR (dB)
20 PSRR (dB)
70
40 VSVS+ 80
50
60
30 VS=12 100 1k 10k 100k 1M 10M 100M
10 10
100 1k
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
6
EL2227 Typical Performance Curves
(Continued)
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing for VS=2.5V AV=2 RF=358 RL=500
-40 -50 Distortion (dBc) -60 -70
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing for VS=12V AV=2 RF=620 RL=500 Distortion (dBc) 2nd H
-50
-60
-70
2nd H
3rd H -80 -90 -100 0 4 8 12 16 20 Output Swing (VPP) Total Harmonic Distortion vs Frequency @ 2VPP VS=12V
-80 3rd H
-90
-100 0 0.5 1 1.5 2 2.5 Output Swing (VPP) Total Harmonic Distortion vs Frequency @ 2VPP VS=2.5V
-60 -70 -80 THD (dBc) -90 -100 -110 -120
-60 -70
RL=50 THD (dBc) RL=50 -80 -90 -100 RL=500 -110 -120 1 10 100 1000 1 10 100 1000 Frequency (kHz) Voltage and Current Noise vs Frequency Voltage Noise (nV/Hz), Current Noise (pA/Hz) 10 9 8 7 6 5 4 3 2 1 10 100 1k Frequency (Hz) 10k 100k -100 100k 1M 10M Frequency (Hz) 100M EN -80 Gain (dB) IN -20 AB -40 BA -60 0 Frequency (kHz) Channel to Channel Isolation vs Frequency RL=500
-3dB Bandwidth vs Temperature 150 140 -3dB Bandwidth (MHz) 130 120 110 100 90 80 -40 IS (mA) 10
Supply Current vs Temperature
9.5
9
-20
0
20
40
60
80
100 120 140
8.5 -50
0
50 Die Temperature (C)
100
150
Die Temperature (C)
7
EL2227 Typical Performance Curves
VOS vs Temperature 2 -2
(Continued)
Input Bias Current vs Temperature
-3 0 IBIAS (A) -2 -5 -4 -50 0 50 Die Temperature (C) Slew Rate vs Temperature 55 160 140 53 Settling Time (ns) 120 100 80 60 40 20 45 -50 0 50 Die Temperature (C) 100 150 0 0.01 0.1 Accuracy (%) 1 VS=12V VO=2VPP Slew Rate (V/s) VS=2.5V VO=2VPP VS=12V VO=5VPP 100 150 VOS (mV) -4
-6 -50
0
50 Die Temperature (C)
100
150
Settling Time vs Accuracy
51
49
47
0.9 0.8 Power Dissipation (W) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Package Power Dissipation vs Ambient Temp. JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 781mW
JA =
607mW
SO 8 16 0 C/ W
J
MS
A =2
OP 8 06 C /W
0
25
50
75 85 100
125
150
Ambient Temperature (C)
8
EL2227 Pin Descriptions
EL2227CY 8-PIN MSOP 1 EL2227CS 8-PIN SO 1 PIN NAME VOUTA PIN FUNCTION Output
VS+
EQUIVALENT CIRCUIT
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
9
EL2227 Applications Information
Product Description
The EL2227 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 EL2227 use 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 EL2227 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. When disabled, both the positive and negative supply voltages are disconnected (see Figure 2 below.)
+12V 1k 10k 10k 1k + 1F 4.7F 1F
1k 75k
FIGURE 2.
ADSL CPE Applications
The low noise EL2227 amplifier is specifically designed for the dual differential receiver amplifier function with ADSL transceiver hybrids as well as other low-noise amplifier applications. A typical ADSL CPE line interface circuit is shown in Figure 1. The EL2227 is used in receiving DMT down stream signal. With careful transceiver hybrid design and the EL2227 1.9nV/Hz voltage noise and 1.2pA/Hz current noise performance, -140dBm/Hz system background noise performance can be easily achieved.
Driver Input RG ZLINE RF + RF Receive Out + + + RF R RIN ROUT Line + ROUT RF Line +
Power Dissipation
With the wide power supply range and large output drive capability of the EL2227, 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 (TJMAX) for all applications to determine if power supply voltages, load conditions, or package type need to be modified for the EL2227 to remain in the safe operating area. These parameters are related as follows:
T JMAX = T MAX + ( JA x PD MAXTOTAL )
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:
V OUTMAX PD MAX = 2 x V S x I SMAX + ( V S - V OUTMAX ) x --------------------------R
L
Receive Amplifie
R RIN
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 To serve as a guide for the user, we can calculate maximum allowable supply voltages for the example of the video cabledriver below since we know that TJMAX = 150C, TMAX = 75C, ISMAX = 9.5mA, and the package JAs are shown in Table 1. If we assume (for this example) that we are driving a
Receive Out -
FIGURE 1. TYPICAL LINE INTERFACE CONNECTION
Disable Function
The EL2227 is in the standard dual amplifier package without the enable/disable function. A simple way to implement the enable/disable function is depicted below.
10
EL2227
back-terminated video cable, then the maximum average value (over duty-cycle) of VOUTMAX is 1.4V, and RL = 150, giving the results seen in Table 1.
TABLE 1. PART EL2227CS EL2227CY PACKAGE SO8 MSOP8 JA MAX PDISS @ TMAX MAX VS
Printed-Circuit Layout
The EL2227 are well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any high-frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1F ceramic capacitor is recommended for bypassing both supplies. Lead lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5k because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance.
160C/W 0.406W @ 85C 206C/W 0.315W @ 85C
Single-Supply Operation
The EL2227 have been designed to have a wide input and output voltage range. This design also makes the EL2227 an excellent choice for single-supply operation. Using a single positive supply, the lower input voltage range is within 200mV 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 EL2227 have a gain-bandwidth product of 137MHz while using only 5mA of supply current per amplifier. For gains greater than 2, their closed-loop -3dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit. For gains less than 2, higherorder poles in the amplifiers' transfer function contribute to even higher closed loop bandwidths. For example, the EL2227 have a -3dB bandwidth of 115MHz at a gain of +2, dropping to 28MHz at a gain of +5. It is important to note that the EL2227 have been designed so that this "extra" bandwidth in low-gain applications does not come at the expense of stability. As seen in the typical performance curves, the EL2227 in a gain of +2 only exhibit 0.5dB of peaking with a 1000 load.
Output Drive Capability
The EL2227 have been designed to drive low impedance loads. They can easily drive 6VPP into a 500 load. This high output drive capability makes the EL2227 an ideal choice for RF, IF and video applications.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
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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