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EL2227C
EL2227C
Dual Very Low Noise Amplifier
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
General Description
The EL2227C 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 EL2227C is perfect for the detection of very low amplitude signals. The EL2227C features a -3dB bandwidth of 115MHz and is gain-of-2 stable. The EL2227C 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 EL2227C 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.
Applications
* * * * * * * ADSL receivers HDSLII receivers Ultrasound input amplifiers Wideband instrumentation Communications equipment AGC & PLL active filters Wideband sensors
Ordering Information
Part No. EL2227CY EL2227CY-T13 EL2227CY-T7 EL2227CS EL2227CS-T13 EL2227CS-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" Outline # MDP0043 MDP0043 MDP0043 MDP0027 MDP0027 MDP0027
Connection Diagram
VOUTA 1 VINA- 2 VINA+ 3 VS- 4 + +
8 VS+ 7 VOUTB 6 VINB5 VINB+
EL2227C (8-Pin SO and 8-Pin MSOP)
August 3, 2001
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
(c) 2001 Elantec Semiconductor, Inc.
EL2227C
EL2227C
Dual Very Low Noise Amplifier
Absolute Maximum Ratings (T
A
= 25C)
Values beyond absolute maximum ratings can cause the device to be prematurely damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied Supply Voltage between VS+ and VS28V Input Voltage VS- - 0.3V, VS +0.3V Maximum Continuous Output Current 40mA
Maximum Die Temperature Storage Temperature Operating Temperature Power Dissipation ESD Voltage
150C -65C to +150C -40C to +85C See Curves 2kV
Important 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 Characteristics
VS+ = +12V, VS - = -12V, RL = 500 and CL = 3pF to 0V, RF = RG = 620, and TA = 25C unless otherwise specified. Parameter Input Characteristics VOS TCVOS IB RIN CIN CMIR CMRR AVOL en in VOL VOH ISC PSRR IS VS SR tS BW HD2 HD3 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 Output Swing Low Output Swing High Short Circuit Current Power Supply Rejection Ratio Supply Current (Per Amplifier) Operating Range Slew Rate[2] Settling to 0.1% (AV = +2) -3dB Bandwidth 2nd Harmonic Distortion 3rd 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 f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 for VIN from -11.8V to 10.4V -5V VOUT 5V f = 100kHz f = 100kHz RL = 500 RL = 250 RL = 500 RL = 250 RL = 10 VS is moved from 2.25V to 12V No Load 2.5 40 50 65 115 93 83 94 76 Power Supply Performance 65 95 4.8 6.5 12 dB mA V V/S ns MHz dBc dBc dBc dBc 10 9.5 140 -11.8 60 70 94 87 1.9 1.2 -10.4 -9.8 10.4 10 180 -10 -9 VCM = 0V
[1]
Description
Condition
Min
Typ -0.2 -0.6
Max 3
Unit mV V/C A M pF
VCM = 0V
-9
-3.4 7.3 1.6 +10.4
V dB dB nV/Hz pA/Hz V V V V mA
Output Characteristics
Dynamic Performance
2
EL2227C
EL2227C
Dual Very Low Noise Amplifier
Electrical Characteristics
VS+= +5V, VS - = -5V, RL = 500 and CL = 3pF to 0V, RF = 620 & TA = 25C unless otherwise specified. Parameter Input Characteristics VOS TCVOS IB RIN CIN CMIR CMRR AVOL en in VOL VOH ISC PSRR IS VS SR tS BW HD2 HD3 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 Output Swing Low for VIN from -4.8V to 3.4V -5V VOUT 5V f = 100kHz f = 100kHz RL = 500 RL = 250 Output Swing High Short Circuit Current Power Supply Rejection Ratio Supply Current (Per Amplifier) Operating Range Slew Rate[2] Settling to 0.1% (AV = +2) -3dB Bandwidth 2nd Harmonic Distortion 3rd 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 f = 1MHz, VO = 2VP-P, RL = 500, RF = 358 f = 1MHz, VO = 2VP-P, RL = 150, RF = 358 RL = 500 RL = 250 RL = 10 VS is moved from 2.25V to 12V No Load 2.5 35 45 77 90 98 90 94 79 Power Supply Performance 65 95 4.5 5.5 12 dB mA V V/S ns MHz dBc dBc dBc dBc 3.5 3.5 60 -4.8 60 70 97 84 1.9 1.2 -3.8 -3.7 3.7 3.6 100 -3.5 -3.5 VCM = 0V
[1]
Description
Condition
Min
Typ 0.2 -0.6
Max 3
Unit mV V/C A M pF
VCM = 0V
-9
-3.7 7.3 1.6 3.4
V dB dB nV/Hz pA/Hz V V V V mA
Output Characteristics
Dynamic Performance
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
Non-inverting Frequency Response for Various RF 4 3 2 Normalized Gain (dB) 0 -1 -2 -3 -4 -5 -6 1M VS=12V AV=+2 RL=500 10M Frequency (Hz) Non-inverting Frequency Response (Gain) 4 3 2 Normalized Gain (dB) 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=-10 AV=-5 AV=-1 AV=-2 100M 200M AV=10 AV=5 Normalized Gain (dB) 1 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 Normalized Gain (dB) 1 RF=1k RF=620 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
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
Non-inverting Frequency Response for Various Input Signal Levels VS=12V RF=350 AV=+2 RL=500 Inverting Frequency Response for Various Input Signal Levels
4 3 2 Normalized Gain (dB) 1 0 -1 -2 -3 -4 -5
4 3 2 Normalized Gain (dB) 1 0 -1 -2 -3 -4 -5
VIN=100mVPP
VIN=20mVPP
VIN=1.4VPP
VIN=20mVPP
VIN=500mVPP VIN=1VPP VIN=2VPP
VIN=2.8VPP VIN=280mVPP VS=12V RF=420 RL=500 AV=-1 10M Frequency (Hz) Inverting Frequency Response for Various CL 100M 200M
-6 100k
1M
10M Frequency (Hz)
100M
-6 1M
Non-inverting Frequency Response for Various CL 5 4 3 Normalized Gain (dB) 1 0 -1 -2 -3 -4 -5 1M VS=12V RF=620 RL=500 AV=+2 10M Frequency (Hz) Non-inverting Frequency Response for Various RL 4 3 2 Normalized Gain (dB) 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 Normalized Gain (dB) 4 3 2 1 0 -1 -2 -3 -4 -5 100M 200M CL=2pF Normalized Gain (dB) 2 CL=12pF CL=30pF 4 3 2 1 0 -1 -2 -3 -4 -5
CL=30pF CL=12pF
CL=2pF
VS=12V RF=420 RL=500 AV=-1 10M Frequency (Hz) Frequency Response for Various Output DC Levels VO=+10V VO=-10V VO=+5V 100M 200M
-6 1M
VO=0V VS=12V RF=620 RL=500 AV=+2 1M VO=-5V
-6 100k
10M Frequency (Hz)
100M
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
3dB Bandwidth vs Supply Voltage 140 120 3dB Bandwidth (MHz) 100 80 60 40 20 0 2 4 6 8 10 Supply Voltage (V) Large Signal Step Response VS=12V RF=620 AV=2 RL=500 AV=-10 12 AV=+5 AV=-5 Peaking (dB) 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 2 4 6 8 10 12 Supply Voltage (V) Large Signal Step Response VS=2.5V RF=620 AV=2 RL=500 AV=+10 AV=-10 AV=+5 AV=-5 AV=-1 AV=+2 AV=+2 RF=620 RL=500 Peaking vs Supply Voltage
AV=+10
AV=-2
0.5V/div
0.5V/div
100ns/div
100ns/div
Small Signal Step Response VS=12V RF=620 AV=2 RL=500
Small Signal Step Response VS=2.5V RF=620 AV=2 RL=500
20mV/div
20mV/div
100ns/div
100ns/div
6
EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
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 dG (%) or dP () AV=5V 0.08 0.06 0.04 0.02 0 -0.02 -1 -0.5 0 DC Input Voltage (V) Closed Loop Output Impedance vs Frequency 0.5 dP AV=2 RF=620 RL=150 fO=3.58MHz 0.1 Differential Gain/Phase vs DC Input Voltage at 3.58MHz
dG 1
1.2/div Output Impedance () 1.2/div 0 0 6 Supply Voltage (V) CMRR 110 90 70 50 30 10 10 VS=12 100 1k 10k 100k 1M 10M 100M 12 Supply Current (mA)
10
6
1
0.1
0.01 10k
100k
1M Frequency (Hz)
10M
100M
PSRR 0 20 40 60 80 100 1k VSVS+
-CMRR (dB)
PSRR (dB)
10k
100k
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
1MHz 2nd and 3rd Harmonic Distortion vs Output Swing for VS=12V AV=2 RF=620 RL=500 2nd H Distortion (dBc) -70 -80 -90 -100 0 4 8 12 16 20 0 0.5 1 1.5 2 2.5 Output Swing (VPP) Total Harmonic Distortion vs Frequency @ 2VPP VS=12V Output Swing (VPP) Total Harmonic Distortion vs Frequency @ 2VPP VS=2.5V 3rd H 2nd H 1MHz 2nd and 3rd Harmonic Distortion vs Output Swing for VS=2.5V AV=2 RF=358 RL=500
-40 -50 -60 -70 -80 -90 -100
-50 -60
Distortion (dBc)
3rd H
-60 -70 -80 THD (dBc) -90 -100 -110 -120
-60 -70
RL=50
RL=50 THD (dBc)
-80 -90 -100 RL=500
RL=500
-110 -120
1
10 Frequency (kHz)
100
1000
1
10 Frequency (kHz)
100
1000
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 EN -80 IN Gain (dB) -20 0
Channel to Channel Isolation vs Frequency
AB -40 -60 BA
-100 100k
1M
10M Frequency (Hz)
100M
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
-3dB Bandwidth vs Temperature 150 140 -3dB Bandwidth (MHz) 130 IS (mA) 120 110 100 90 80 -40 8.5 -50 9.5 10 Supply Current vs Temperature
9
-20
0
20
40
60
80
100
120
140
0
50 Die Temperature (C)
100
150
Die Temperature (C) VOS vs Temperature 2 -2
Input Bias Current vs Temperature
-3 0 IBIAS (A) -2 -5 -4 -50 0 50 Die Temperature (C) Slew Rate vs Temperature 55 53 Settling Time (ns) Slew Rate (V/s) 51 49 47 45 -50 160 140 120 100 80 60 40 20 0 50 Die Temperature (C) 100 150 0 0.01 0.1 Accuracy (%) 1 VS=12V VO=2VPP 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
9
EL2227C
EL2227C
Dual Very Low Noise Amplifier
Typical Performance Curves
Package Power Dissipation vs Ambient Temp. JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board 781mW 607mW
J SO 16 8 0 C/ W
0.9 0.8 0.7 Power Dissipation (W) 0.6 0.5 0.4 0.3 0.2 0.1 0
A=
J
A =2
MS OP 8 06 C/W
0
25
50
75 85
100
125
150
Ambient Temperature (C)
10
EL2227C
EL2227C
Dual Very Low Noise Amplifier
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
VINA-
Input
VS+
VIN+
VIN-
VSCircuit 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 2 Reference Circuit 1
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Applications Information
Product Description
The EL2227C 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 EL2227C 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 EL2227C allows, for example, a capacitor to be placed in the feedback path, making it an excellent choice for applications such as active filters, sampleand-holds, or integrators.
ADSL CPE Applications
The low noise EL2227C 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 EL2227C is used in receiving DMT down stream signal. With careful transceiver hybrid design and the EL2227C 1.9nV/Hz voltage noise and 1.2pA/Hz current noise performance, -140dBm/Hz system background noise performance can be easily achieved.
Driver Input
+ RF RG
ROUT
Line +
ZLINE RF + RF + + RF R RIN ROUT Line -
Receive Out +
Receive Amplifiers
R RIN
Receive Out -
Figure 1. Typical Line Interface Connection
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
Disable Function
The EL2227C is in the standard dual amplifier package without the enable/disable function. A simple way to implement the enable/disable function is depicted below. When disabled, both the positive and negative supply voltages are disconnected (see Figure 2 below.)
+12V 1k 10k 10k 1k + 1F 4.7F 1F
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 cable-driver 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 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.
1k 75k
Table 1
Power Dissipation
With the wide power supply range and large output drive capability of the EL2227C, 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 EL2227C to remain in the safe operating area. These parameters are related as follows:
T JMAX = T MAX + ( JA x PD MAXTOTAL ) Part EL2227CS EL2227CY Package SO8 MSOP8 JA 160C/W 206C/W Max PDISS @ TMAX 0.406W @ 85C 0.315W @ 85C Max VS
Single-Supply Operation
The EL2227C have been designed to have a wide input and output voltage range. This design also makes the EL2227C 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.
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 ---------------------------RL
Gain-Bandwidth Product and the -3dB Bandwidth
The EL2227C 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 gain13
where: TMAX =Maximum Ambient Temperature
EL2227C
EL2227C
Dual Very Low Noise Amplifier
bandwidth product divided by the noise gain of the circuit. For gains less than 2, higher-order poles in the amplifiers' transfer function contribute to even higher closed loop bandwidths. For example, the EL2227C 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 EL2227C 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 EL2227C in a gain of +2 only exhibit 0.5dB of peaking with a 1000 load.
Output Drive Capability
The EL2227C have been designed to drive low impedance loads. They can easily drive 6VPP into a 500 load. This high output drive capability makes the EL2227C an ideal choice for RF, IF and video applications.
Printed-Circuit Layout
The EL2227C 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.
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EL2227C
EL2227C
Dual Very Low Noise Amplifier
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec Semiconductor, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec Semiconductor, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
WARNING - Life Support Policy
Elantec Semiconductor, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec Semiconductor, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec Semiconductor, Inc. Products in Life Support Systems are requested to contact Elantec Semiconductor, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec Semiconductor, Inc.'s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages.
Printed in U.S.A.
Elantec Semiconductor, Inc.
August 3, 2001
675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820
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