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EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Features
* Rail to Rail Output Swing
General Description
The EL5144C series amplifiers are voltage feedback, high speed, rail to rail amplifiers designed to operate on a single +5V supply. They offer unity gain stability with an unloaded -3dB bandwidth of 100 MHz. The input common mode voltage range extends from the negative rail to within 1.5V of the positive rail. Driving a 75 double terminated coaxial cable, the EL5144C series amplifiers drive to within 150 mV of either rail. The 200 V/sec slew rate and 0.1% / 0.1 differential gain / differential phase makes these parts ideal for composite and component video applications. With its voltage feedback architecture, this amplifier can accept reactive feedback networks, allowing them to be used in analog filtering applications These amplifiers will source 90 mA and sink 65 mA. The EL5146C and EL5246C have a power-savings disable feature. Applying a standard TTL low logic level to the CE (Chip Enable) pin reduces the supply current to 2.6 A within 10 nsec. Turn on time is 500 nsec, allowing true break-before-make conditions for multiplexing applications. Allowing the CE pin to float or applying a high logic level will enable the amplifier. For applications where board space is critical, singles are offered in a SOT23-5 package, duals in MSOP-8 and MSOP-10 packages, and quads in a QSOP-16 package. Singles, duals and quads are also available in industry standard pinouts in SOIC and PDIP packages. All parts operate over the industrial temperature range of -40C to +85C.
5V
0V
-3 dB Bandwidth = 100 MHz Single Supply +5V operation Power Down to 2.6 A Large Input Common Mode Range 0V < VCM < 3.5 V * Diff Gain/Phase = 0.1%/0.1 * Low Power 35mW per amplifier * Space Saving SOT23-5, MSOP8&10, & QSOP-16 packaging
* * * *
Applications
* * * * * * * * Video Amplifier 5 Volt Analog Signal Processing Multiplexer Line Driver Portable Computers High Speed Communications Sample & Hold Amplifier Comparator
Pin Configurations
SOIC-8, PDIP-8 SOT23-5 NC 1 8 CE 7 VS 6 OUT 5 NC
Ordering Information
Part No EL5144CW EL5146CN EL5146CS EL5244CN EL5244CS EL5244CY EL5246CN EL5246CS EL5246CY EL5444CN EL5444CS EL5444CU Temp. Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package 5 Pin SOT23 8 Pin PDIP 8 Pin SOIC 8 Pin PDIP 8 Pin SOIC 8 Pin MSOP 14 Pin PDIP 14 Pin SOIC 10 Pin MSOP 14 Pin PDIP 14 Pin SOIC 16 Pin QSOP Outline # MDP0038 MDP0031 MDP0027 MDP0031 MDP0027 MDP0043 MDP0031 MDP0027 MDP0043 MDP0031 MDP0027 MDP0040
OUT 1 GND 2 IN+ 3 EL5144C
5 VS IN- 2 +
Dual and Quad Amplifier Pin Configurations on Page 12
+
IN+ 3 4 INGND 4
March 1, 2000
EL5146C
(c) 1998 Elantec, Inc.
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Absolute Maximum Ratings (T
A
= 25 C)
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. +6V Supply Voltage between VS and GND Maximum Continuous Output Current 50mA
Power Dissipation Pin Voltages Storage Temperature Operating Temperature Lead Temperature
See Curves GND - 0.5V to VS +0.5V -65C to +150C -40C to +85C 260C
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=+5V, GND=0V, TA=25C, CE = +2V, unless otherwise specified. Parameter AC Performance dG dP BW BW1 GBWP SR ts AVOL VOS TCVOS IB CMIR CMRR RIN CIN VOP Differential Gain Error Differential Phase Error Bandwidth Bandwidth Gain Bandwidth Product Slew Rate Settling Time Open Loop Voltage Gain G=1, RL=150 to GND, RF=0, VO=0.5V to 3.5V to 0.1%, VOUT = 0 to 3V RL=no load, VOUT=0.5V to 3V RL=150 to GND, VOUT=0.5V to 3V Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Common Mode Input Range Common Mode Rejection Ratio Input Resistance Input Capacitance Positive Output Voltage Swing RL=150 to 2.5V [2] RL=150 to GND [2] RL=1K to 2.5V [2] VON Negative Output Voltage Swing RL=150 to 2.5V [2] RL=150 to GND [2] RL=1K to 2.5V [2] +IOUT Positive Output Current RL=10 to 2.5V 60 4.70 4.20 4.95 VCM=0V & 3.5V CMRR 47dB DC, VCM = 0 to 3.0V DC, VCM = 0 to 3.5V 0 50 47 60 60 1.5 1.5 4.85 4.65 4.97 0.15 0 0.03 90 0.05 120 0.30 VCM=1V, SOT23-5 and MSOP packages VCM=1V, All other packages 10 2 100 3.5 54 40 150
[1] [1]
Description
Conditions
Min
Typ
Max
Units
G=2, RL=150 to 2.5V, RF=1K G=2, RL=150 to 2.5V, RF=1K -3dB, G=1, RL=10k, RF=0 -3dB, G=1, RL=150, RF=0 0.1dB, G=1, RL=150 to GND, RF=0
0.1 0.1 100 60 8 60 200 35 65 50 25 15
% deg MHz MHz MHz MHz V/s ns dB dB mV mV V/OC nA V dB dB G pF V V V V V V mA
DC Performance
Input Characteristics
Output Characteristics
2
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Electrical Characteristics
VS=+5V, GND=0V, TA=25C, CE = +2V, unless otherwise specified. Parameter -IOUT tEN tDIS IIHCE IILCE VIHCE VILCE Supply IsON IsOFF PSOR PSRR Supply Current - Enabled (per amplifier) Supply Current - Disabled (per amplifier) Power Supply Operating Range Power Supply Rejection Ratio DC, VS = 4.75V to 5.25V No Load, VIN= 0V, CE=5V No Load, VIN= 0V, CE=0V 4.75 50 7 2.6 5.0 60 8.8 5 5.25 mA A V dB Description Negative Output Current RL=10 to 2.5V EL5146C, EL5246C EL5146C, EL5246C CE = 5V, EL5146C, EL5246C CE = 0V, EL5146C, EL5246C EL5146C, EL5246C EL5146C, EL5246C 2.0 0.8 Conditions Min -50 Typ -65 Max -80 Units mA
Enable (EL5146C & EL5246C Only) Enable Time Disable Time CE pin Input High Current CE pin Input Low Current CE pin Input High Voltage for Power Up CE pin Input Low Voltage for Power Down 500 10 0.003 -1.2 1 -3 nS nS A A V V
1. Standard NTSC test, AC signal amplitude = 286 mVp-p, f=3.58 MHz, VOUT is swept from 0.8V to 3.4V, RL is DC coupled 2. RL is Total Load Resistance due to Feedback Resistor and Load Resistor
3
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Typical Performance Curves
19 +2 MAGNITUDE (NORMALIZED) (dB) AV = +1, RF = 0 0 -45 PHASE () -2 AV = +2, RF = 1K 0 AV = +1, RF = 0 Non-Inverting Frequency Response (Gain) VCM = 1.5V, RL = 150 15 Non-Inverting Frequency Response (Phase) VCM = 1.5V, RL= 150
-90
-4
AV = +2, RF = 1K AV = +5.6, RF = 1K
-6
AV = +5.6, RF = 1K
-135
-180 -8 1M 10M FREQUENCY (Hz) Inverting Frequency Response (Gain) VCM = 1.5V, RF = 1K, RL= 150 +2 100M 1M 10M FREQUENCY(Hz) Inverting Frequency Response (Phase) VCM = 1.5V, RF = 1K, RL= 150 AV = -1 100M
1
2
MAGNITUDE (NORMAILZED) (dB)
AV = -1
180
0 AV = -5.6 -2
AV = -2 PHASE ()
135 AV = -5.6 90
AV = -2
-4
45
-6 1M 10M FREQUENCY (Hz) 3dB Bandwidth vs. Die Temperature for Various Gains RL = 150 100M
0 1M 10M FREQUENCY (Hz) 3dB Bandwidth vs. Die Temperature for Various Gains RL = 10K 100M
52 100
51 150
3dB BANDWIDTH (MHz)
AV = +1, RF = 0 60 AV = +2, RF = 1K 40
3dB BANDWIDTH (MHz)
80
120
AV = +1, RF = 0
90 AV = +2, RF = 1K
60
20
AV = +5.6, RF = 1K
30
AV = +5.6, RF = 1K
0 -55
-15
25
65
105
145
0 -55
-15
25
65
105
145
DIE TEMPERATURE (C)
DIE TEMPERATURE (C)
4
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Frequency Response for Various RL VCM = 1.5V, RF = 0, AV = +1 +4 RL= 10K MAGNITUDE (NORMALIZED) (dB)
16
17
Frequency Response for Various CL VCM = 1.5V, RL = 150, AV = +1 +8 CL= 100pF CL= 47pF
MAGNITUDE (NORMALIZED) (dB)
+2
+4
0 RL= 520 -2 RL= 150 -4 1M 10M FREQUENCY (Hz) Frequency Response for Various RF and RG VCM = 1.5V,RL = 150, AV = +2 RF = RG = 2K RF = RG = 1K 0 RF = RG = 560 100M
0 CL= 22pF -4 CL= 0pF
-8 1M 10M FREQUENCY (Hz) Group Delay vs. Frequency 10 100M
18
23
MAGNITUDE (NORMALIZED) (dB)
+2
AV = +2 RF = 1K GROUP DELAY (nsec) 8
6
-2
4 AV = +1 RF = 0
-4
2 -6 1M 10M FREQUENCY (Hz) Open Loop Gain and Phase vs. Frequency 0 80 RL = 1K Phase 90 40 RL = 150 20 Gain 180 135 OPEN LOOP GAIN (dB) 45 60 70 100M 0 1M 10M
100M
FREQUENCY (Hz) Open Loop Voltage Gain vs. Die Temperature 80 No Load
29
43
GAIN (dB)
60
PHASE ()
50 RL=150
40
0 1K
100K FREQUENCY (Hz)
10M
30 -55
-15
25
65
105
145
DIE TEMPERATURE (C)
5
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
65 10K
Voltage Noise vs. Frequency
26 200
Closed Loop Output Impedance vs. Frequency RF = 0, AV = +1
VOLTAGE NOISE (nV/Hz)
CLOSED LOOP (Z0)
1K
20
100
2
10
0.2 1 10 1K 100K FREQUENCY (Hz) Offset Voltage vs. Die Temperature (6 Typical Samples) 10M 10K 100K 1M FREQUENCY (Hz) PSRR and CMRR vs. Frequency 10M 100M
39
28 +20
12 OFFSET VOLTAGE (mV) 0 6 PSRR, CMRR (dB) CMRR -20 -PSRR +PSRR -40
0
-6
-60 -12 -80 -55 -15 25 65 105 145 1K 10K 100K 1M 10M 100M DIE TEMPERATURE (C) 21 5 Output Voltage Swing vs. Frequency for THD < 1% RF = 1K, AV = +2 OUTPUT VOLTAGE SWING (VPP) FREQUENCY (Hz) Output Voltage Swing vs. Frequency for THD < 0.1% RF = 1K, AV = +2 5
22
OUTPUT VOLTAGE SWING (VPP)
4 RL = 500 to 2.5V
4
3
3 RL = 500 to 2.5V RL = 150 to 2.5V 1
2 RL = 150 to 2.5V
2
1
0 1M
10M FREQUENCY (Hz)
100M
0 1M
10M FREQUENCY (Hz)
100M
6
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
62 4
Large Signal Pulse Response (Single Supply) VS= +5V, RL = 150 to 0V, RF = 1K, AV = +2
63
Small Signal Pulse Response (Single Supply) VS= +5V, RL = 150 to 0V, RF = 1K, AV = +2
OUTPUT VOLTAGE (V)
3
OUTPUT VOLTAGE (V) TIME (20ns/DIV) Large Signal Pulse Response (Split Supplies) VS= 2.5V, RL = 150 to 0V, RF = 1K, AV = +2
1.7
2
1.5
1
1.3
0 TIME (20ns/DIV) Small Signal Pulse Response (Split Supply) VS= 2.5V, RL = 150 to 0V, RF = 1K, AV = +2
61
64
OUTPUT VOLTAGE (V)
+2
OUTPUT VOLTAGE (V) TIME (20ns/DIV) Settling Time vs. Settling Accuracy RL=1K, RF = 500, AV = -1, VSTEP = 3V
+0.2
0
0
-2
-0.2
TIME (20ns/DIV) Slew Rate vs. Die Temperature
70 100
48 250
SETTLING TIME (nsec)
80 SLEW RATE (V/S)
60
200
40
20 150 -55
0 0.01
0.1 SETTLING ACCURACY (%)
1.0
-15
25
65
105
145
DIE TEMPERATURE (C)
7
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
54
Differential Gain for RL Tied to 0V RF = 0, AV = +1
53
Differential Phase for RL Tied to 0V RF = 0, AV = +1
+0.08 DIFFERENTIAL PHASE () DIFFERENTIAL GAIN (%)
+0.2
+0.04
RL = 10K
+0.1
RL = 150
0 RL = 150
0
-0.04
-0.1
RL = 10K
-0.08 0.25 1.75 VOUT (V) 56 Differential Gain for RL Tied to 2.5V RF = 0, AV = +1 3.25
-0.2 0.25 1.75 VOUT (V) 55 Differential Phase for RL Tied to 2.5V RF = 0, AV = +1 3.25
+0.2 RL = 150 DIFFERENTIAL PHASE () DIFFERENTIAL GAIN (%)
+0.2
+0.1
+0.1
RL = 10K RL =
0
0 RL = 150 R=
-0.1
-0.1
RL = 10K
-0.2 0.5 2.0 VOUT (V) Differential Gain for RL Tied to 0V RF = 1K, AV = +2 3.5
-.02 0.5 2.0 VOUT (V) Differential Phase for RL Tied to 0V RF = 1K, AV = +2 3.5
32
34
+0.2 RL = 150 +0.1 RL = 10K 0 DIFFERENTIAL PHASE () DIFFERENTIAL GAIN (%)
+0.2 RL = 150 +0.1 RL = 10K
0
-0.1
-0.1
-0.2 0.5 2.0 VOUT (V) 3.5
-0.2 0.5 2.0 VOUT (V) 3.5
8
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
31
Differential Gain for RL Tied to 2.5V RF = 1K, AV = +2
33
Differential Phase for RL Tied to 2.5V RF = 1K, AV = +2
+0.2 DIFFERENTIAL PHASE () DIFFERENTIAL GAIN (%)
+0.2 RL = 10K +0.1
+0.1
RL = 150
0
0
-0.1
RL = 10K
-0.1 RL = 150 -0.2
-0.2 0.5 2.0 VOUT (V) 2nd and 3rd Harmonic Distortion vs. Frequency VOUT = 0.25V to 2.25V, RL = 100 to 0V -25 3.5
0.5
2.0 VOUT (V)
3.5
5
6 -25
2nd and 3rd Harmonic Distortion vs.Frequency VOUT = 0.5V to 2.5V, RL = 100 to 0V
HD3 -35 DISTORTION (dBc) HD3 -45 HD2 DISTORTION (dBc) -35
-45
HD2
-55
-55
-65
-65
-75 1M
10M FREQUENCY (Hz)
100M
-75 1M
10M FREQUENCY (Hz)
100M
7 -25
2nd and 3rd Harmonic Distortion vs. Frequency VOUT = 1V to 3V, RL = 100 to 0V
27 0
Channel to Channel Crosstalk- Duals and Quads (Worst Channel)
-35 DISTORTION (dBc)
HD3 CROSSTALK (dB)
-20
-45 HD2 -55
-40
-60
-65
-80
-75 1M
10M FREQUENCY (Hz)
100M
-100 100K
1M
10M
100M
FREQUENCY (Hz)
9
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
44
Supply Current (per Amp) vs. Supply Voltage 8 OUTPUT CURRENT (mA)
45 120
Output Current vs. Die Temperature RL = 10 to 2.5V
SUPPLY CURRENT (mA)
100
6
80
Source
4
60
2
40
Sink
0 0 1 2 3 4 5 20 -55 -15 25 65 105 145
SUPPLY VOLTAGE (V) Supply Current - ON (per amp) vs. Die Temperature 9
DIE TEMPERATURE (C) Supply Current - OFF (per amp) vs. Die Temperature 5
46
47
SUPPLY CURRENT (mA)
SUPPLY CURRENT (A)
8
4
7
3
6
2
5
1
4 -55
-15
25
65
105
145
0 -55
-15
25
65
105
145
DIE TEMPERATURE (C) Positive Output Voltage Swing vs. Die Temperature RL = 150
DIE TEMPERATURE (C) Negative Output Voltage Swing vs. Die Temperature 0.5
69 5.0
41
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4.9
RL=150 to 2.5V
0.4 RL=150 to 2.5V
4.8
0.3
4.7
0.2
4.6
RL=150 to 0V
0.1
RL=150 to 0V
4.5 -55
-15
25
65
105
145
0 -55
-15
25
65
105
145
DIE TEMPERATURE (C)
DIE TEMPERATURE (C)
10
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
40 300
Output Voltage from Either Rail vs. Die Temperature for Various Effective RLOAD
71 -20
OFF Isolation - EL5146C & EL5246C
OUTPUT VOLTAGE (mV)
100
Effective RLOAD = 1K Effective RLOAD = 5K 10
MAGNITUDE (dBc)
Effective RLOAD = 150
-40
EL 5146CS & EL5146CN
-60 EL5246CN EL5246CS
-80
-100 Effective R LOAD = RL//RF to VS/2 1 -55 -15 25 65 105 145 -120 10k 100k 1M FREQUENCY (Hz) Maximum Power Dissipation vs. Ambient Temperature Duals (TJMAX = 150C) 10M 100M
DIE TEMPERATURE (C) Maximum Power Dissipation vs. Ambient Temperature Singles (TJMAX = 150C)
67 2.0
66 2.5
POWER DISSIPATION (W)
POWER DISSIPATION (W)
1.6
PDIP, JA = 110C/W SOIC, JA = 161C/W
2.0
PDIP-14, JA = 87C/W PDIP-8, JA = 107C/W SOIC-14, JA = 120C/W
1.2
1.5
0.8
1.0
0.4 SOT23-5, JA = 256C/W 0 -50 -20 10 40 70
0.5
SOIC-8, JA = 159C/W MSOP-8,10, JA = 206C/W -20 10 40 70 100
100
0 -50
AMBIENT TEMPERATURE (C) Maximum Power Dissipation vs. Ambient Temperature Quads (TJMAX = 150C)
AMBIENT TEMPERATURE (C)
68 2.5
POWER DISSIPATION (W)
2.0
PDIP-14, JA = 83C/W
1.5
1.0
0.5
SOIC-14, JA = 118C/W QSOP-16, JA = 158C/W
0 -50
-20
10
40
70
100
AMBIENT TEMPERATURE (C)
11
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Configurations
SOIC-14, PDIP-14 MSOP-10 SOIC-8, PDIP-8, MSOP-8 INA+ 1 OUTA 1 INA- 2 INA+ 3 GND 4 + EL5244C + 8 VS CEA 2 7 OUTB GND 3 6 INBCEB 4 5 INB+ INB+ 5 EL5246C + + 10 INA9 OUTA 8 VS 7 OUTB 6 INBNC 2 CEA 3 GND 4 CEB 5 NC 6 INB+ 7 EL5246C + INA+ 1 + 14 INA13 OUTA 12 NC 11 VS 10 NC 9 OUTB 8 INB-
QSOP-16 SOIC-14, PDIP-14 OUTA OUTA 1 INA- 2 INA+ 3 VS 4 INB+ 5 INB- 6 OUTB 7 EL5444C EL5444C + + 14 OUTD INA13 INDINA+ 12 IND+ VS 11 GND VS 10 INC+ INB+ 6 + 11 INC+ 5 12 GND 4 13 GND 3 14 IND+ 2 15 IND+ 1 16 OUTD
+
+
Single Amplifier Pin Configurations on Page 1
+ -
9 8
INCINBOUTC OUTB 8 9 OUTC
+ -
7
10 INC-
12
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Description
EL5244C (SO/PDIP/MSOP) EL5146C (SO/PDIP) EL5246C (SO/PDIP) EL5444C (SO/PDIP) EL5144C (SOT23-5) EL5246C (MSOP) EL5444C (QSOP) Name 8 3 11 4 4 11 4,5 12,13 VS GND IN+
Function Positive Power Supply Ground or Negative Power Supply Noninverting Input
Equivalent Circuit
5 2 3
7 4 3
8 4
VS
GND Circuit 1
4 1
2 6
INOUT
Inverting Input Amplifier Output
(Reference Circuit 1)
VS
GND Circuit 2
3 2 1 5 6 7
1 10 9 5 6 7
1 14 13 7 8 9
3 2 1 5 6 7 10 9 8 12 13 14
3 2 1 6 7 8 11 10 9 14 15 16
INA+ INAOUTA INB+ INBOUTB INC+ INCOUTC IND+ INDOUTD
Amplifier A Noninverting Input Amplifier A Inverting Input Amplifier A Output Amplifier B Noninverting Input Amplifier B Inverting Input Amplifier B Output Amplifier C Noninverting Input Amplifier C Inverting Input Amplifier C Output Amplifier D Noninverting Input Amplifier D Inverting Input Amplifier D Output
(Reference Circuit 1) (Reference Circuit 1) (Reference Circuit 2) (Reference Circuit 1) (Reference Circuit 1) (Reference Circuit 2) (Reference Circuit 1) (Reference Circuit 1) (Reference Circuit 2) (Reference Circuit 1) (Reference Circuit 1) (Reference Circuit 2)
13
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Description
EL5244C (SO/PDIP/MSOP) EL5146C (SO/PDIP) EL5246C (SO/PDIP) EL5444C (SO/PDIP) EL5144C (SOT23-5) EL5246C (MSOP) EL5444C (QSOP) Name CE
Function Enable (Enabled when high)
Equivalent Circuit
VS
8
+ - GND Circuit 3
1.4V
2 4 1,5
3 5 2,6, 10,12
CEA CEB NC
Enable Amplifier A (Enabled when high) Enable Amplifier B (Enabled when high) No Connect. Not internally connected.
(Reference Circuit 3) (Reference Circuit 3)
14
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Description of Operation and Applications Information
Product Description
The EL5144C series is a family of wide bandwidth, single supply, low power, rail-to-rail output, voltage feedback operational amplifiers. The family includes single, dual, and quad configurations. The singles and duals are available with a power down pin to reduce power to 2.6A typically. All the amplifiers are internally compensated for closed loop feedback gains of +1 or greater. Larger gains are acceptable but bandwidth will be reduced according to the familiar Gain-Bandwidth Product. Connected in voltage follower mode and driving a high impedance load, the EL5144C series has a -3dB bandwidth of 100 MHz. Driving a 150 load, they have a -3dB bandwidth of 60 MHz while maintaining a 200 V/S slew rate. The input common mode voltage range includes ground while the output can swing rail to rail. ceramic capacitor from VS to GND will suffice. This same capacitor combination should be placed at each supply pin to ground if split supplies are to be used. In this case, the GND pin becomes the negative supply rail. For good AC performance, parasitic capacitance should be kept to a minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets, particularly for the SO package, should be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance.
Input, Output, and Supply Voltage Range
The EL5144C series has been designed to operate with a single supply voltage of 5V. Split supplies can be used so long as their total range is 5V. The amplifiers have an input common mode voltage range that includes the negative supply (GND pin) and extends to within 1.5V of the positive supply (VS pin). They are specified over this range. The output of the EL5144C series amplifiers can swing rail to rail. As the load resistance becomes lower in value, the ability to drive close to each rail is reduced. However, even with an effective 150 load resistor connected to a voltage halfway between the supply rails, the output will swing to within 150mV of either rail.
Power Supply Bypassing and Printed Circuit Board Layout
As with any high-frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible. The power supply pin must be well bypassed to reduce the risk of oscillation For normal single supply operation, where the GND pin is connected to the ground plane, a single 4.7 F tantalum capacitor in parallel with a 0.1 F
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EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Figure 1 shows the output of the EL5144C series amplifier swinging rail to rail with RF = 1K, AV = +2 and RL = 1M. Figure 2 is with RL = 150 . +1. As this combination gets smaller, the bandwidth falls off. Consequently, RF also has a minimum value that should not be exceeded for optimum performance. For AV = +1, RF = 0 is optimum. For AV = -1 or +2 (noise gain of 2), optimum response is obtained with RF between 300 and 1K . For AV = -4 or +5 (noise gain of 5), keep RF between 300 and 15K .
5V
Video Performance
For good video signal integrity, an amplifier is required to maintain the same output impedance and the same frequency response as DC levels are changed at the output. This can be difficult when driving a standard video load of 150, because of the change in output current with DC level. A look at the Differential Gain and Differential Phase curves for various supply and loading conditions will help you obtain optimal performance. Curves are provided for AV = +1 and +2, and RL = 150 and 10 K tied both to ground as well as 2.5V. As with all video amplifiers, there is a common mode sweet spot for optimum differential gain / differential phase. For example, with AV = +2 and RL = 150 tied to 2.5V, and the output common mode voltage kept between 0.8V and 3.2V, dG/dP is a very low 0.1% / 0.1. This condition corresponds to driving an AC-coupled, double terminated 75 coaxial cable. With A V = +1, RL = 150 tied to ground, and the video level kept between 0.85V and 2.95V, these amplifiers provide dG/dP perfo rm ance of 0.05 % / 0.20 . Th is c ond it ion is representative of using the EL5144C series amplifier as a buffer driving a DC coupled, double terminated, 75 coaxial cable. Driving high impedance loads, such as signals on computer video cards, gives similar or better dG/dP performance as driving cables.
0V
Figure 1
5V
0V
Figure 2
Choice of Feedback Resistor, RF
These amplifiers are optimized for applications that require a gain of +1. Hence, no feedback resistor is required. However, for gains greater than +1, the feedback resistor forms a pole with the input capacitance. As this pole becomes larger, phase margin is reduced. This causes ringing in the time domain and peaking in the frequency domain. Therefore, R F has some maximum value that should not be exceeded for optimum performance. If a large value of R F must be used, a small capacitor in the few picofarad range in parallel with RF can help to reduce this ringing and peaking at the expense of reducing the bandwidth. As far as the output stage of the amplifier is concerned, RF + RG appear in parallel with RL for gains other than
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Driving Cables and Capacitive Loads
The EL5144C series amplifiers can drive 50pF loads in parallel with 150 with 4dB of peaking and 100pF with 7dB 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 to eliminate most peaking. However, this will obviously reduce the gain slightly. If your gain is greater than 1, the gain resistor (RG) can then be chosen to make up for any gain
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
loss which may be created by this additional resistor at the output. Another method of reducing peaking is to add a "snubber" circuit at the output. A snubber is a resistor in a series with a capacitor, 150 and 100pF being typical values. The advantage of a snubber is that it does not draw DC load current. When used as a cable driver, double termination is always recommended for reflection-free performance. For those applications, the back-termination series resistor will de-couple the EL5144C series amplifier from the cable and allow extensive capacitive drive. However, other applications may have high capacitive loads without a back-termination resistor. Again, a small series resistor at the output can reduce peaking.
Power Dissipation
With the high output drive capability of the EL5144C series amplifiers, it is possible to exceed the 150C 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 or package type 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:
Disable / Power-Down
The EL5146C and EL5246C amplifiers can be disabled, placing its output in a high-impedance state. Turn off time is only 10 nsec and turn on time is around 500 nsec. When disabled, the amplifier's supply current is reduced to 2.6A typically, thereby effectively eliminating power consumption. The amplifier's power down can be controlled by standard TTL or CMOS signal levels at the CE pin. The applied logic signal is relative to the GND pin. Letting the CE pin float will enable the amplifier. Hence, the 8 pin PDIP and SOIC single amps are pin compatible with standard amplifiers that don't have a power down feature.
T JMAX - T AMAX PD MAX = -------------------------------------------- JA
where: TJMAX = Maximum Junction Temperature TAMAX = Maximum Ambient Temperature JA = Thermal Resistance of the Package PDMAX = Maximum Power Dissipation in the Package. 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 load, or:
Short Circuit Current Limit
The EL5144C series amplifiers do not have internal short circuit protection circuitry. Short circuit current of 90 mA sourcing and 65 mA sinking typically will flow if the output is trying to drive high or low but is shorted to half way between the rails. If an output is shorted indefinitely, the power dissipation could easily increase such that the part will be destroyed. Maximum reliability is maintained if the output current never exceeds 50mA. This limit is set by internal metal interconnect limitations. Obviously, short circuit conditions must not remain or the internal metal connections will be destroyed.
V OUT PD MAX = N * V S * I SMAX + ( V S - V OUT ) * --------------- RL
where: N = Number of amplifiers in the package VS = Total Supply Voltage
17
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
ISMAX = Maximum Supply Current Per Amplifier VOUT = Maximum Output Voltage of the Application RL = Load Resistance tied to Ground If we set the two PDMAX equations equal to each other, we can solve for RL:
VIN +2.5V 4 Figure 3 5 + -
ure 4 is a graph of propagation delay vs. overdrive as a square wave is presented at the input of the comparator.
+5V 1 EL5146C 2 3 + 7 VOUT 6 RL 8 0.1F
V OUT * ( V S - V OUT ) R L = --------------------------------------------------------------------------------------------- T JMAX - T AMAX --------------------------------------------- - ( V S * I SMAX ) N * JA
8 1000
Propagation Delay vs. Overdrive for Amplifier Used as a Comparator
PROPAGATION DELAY(nsec)
Assuming worst case conditions of TA = +85C, Vout = VS/2 V, VS = 5.5V, and ISMAX = 8.8mA per amplifier, below is a table of all packages and the minimum RL allowed.
Part Package Minimum RL
Negative Going Signal 100
EL5144CW EL5146CS EL5146CN EL5244CS EL5244CN EL5244CY EL5246CY EL5246CS EL5246CN EL5444CU EL5444CS EL5444CN
SOT23-5 SOIC-8 PDIP-8 SOIC-8 PDIP-8 MSOP-8 MSOP-10 SOIC-14 PDIP-14 QSOP-16 SOIC-14 PDIP-14
37
21 14 48 30 69 69 34 23 139 85 51
Positive Going Signal
10 0.01 0.1 OVERDRIVE (V) Figure 4 1.0
Multiplexing with the EL5144C Series Amplifier
Besides normal power down usage, the CE (Chip Enable) pin on the EL5146C and EL5246C series amplifiers also allow for multiplexing applications. Figure 5 shows an EL5246C with its outputs tied together, driving a back terminated 75 video load. A 3 Vp-p 10 MHz sine wave is applied at Amp A input, and a 2.4 Vp-p 5 MHz square wave to Amp B. Figure 6 shows the SELECT signal that is applied, and the resulting output waveform at VOUT . Observe the break-before-make operation of the multiplexing. Amp A is on and VIN1 is being passed through to the output of the amplifier. Then Amp A turns off in about 10 nsec. The output decays to
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EL5144C Series Comparator Application
The EL5144C series amplifier can be used as a very fast, single supply comparator. Most op amps used as a comparator allow only slow speed operation because of output saturation issues. The EL5144C series amplifier doesn't suffer from output saturation issues. Figure 3 shows the amplifier implemented as a comparator. Fig-
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
ground with an RL CL time constants. 500 nsec later, Amp B turns on and VIN2 is passed through to the output. This break-before-make operation ensures that more than one amplifier isn't trying to drive the bus at the same time. Notice the outputs are tied directly together. Isolation resistors at each output are not necessary.
VIN 1 3V PP 10MHz
Free Running Oscillator Application
Figure 7 is an EL5144C configured as a free running oscillator. To first order, ROSC and COSC determine the frequency of oscillation according to:
1 2 3 EL5246C 4 +
14 VOUT 13 12 +5V 11 10 + 9 150 8 4.7F 0.1F
0.72 F OSC = ----------------------------------R OSC * C
OSC
Select 5 6 VIN 2 2.4V PP 5MHz 7 Figure 5
For rail to rail output swings, maximum frequency of oscillation is around 15 MHz. If reduced output swings are acceptable, 25 MHz can be achieved. Figure 8 shows the oscillator for ROSC = 510 , COSC = 240 pF and FOSC = 6 MHz.
470K
+5V
1 470K 5V 2 3 470K VOUT
5 0.1F 4 COSC ROSC
+
Figure 7
0V 5V Select 0V 5V Figure 6 VOUT
0V
Figure 8
19
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, 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.
March 1, 2000
675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 Fax: (408) 945-9305 Toll Free: 1 - (888) ELANTEC Web Site: http://www.elantec.com European Office: 44-118-977-6020 Japan Tech Center: 81-45-682-5820
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Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, 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, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, 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.

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