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Data
January 29, 2008
-INT Sheet
1-888
EL8108
FN7417.2
Video Distribution Amplifier
Features
The EL8108 is a dual current feedback
operational amplifier designed for
video distribution solutions. This
device features a high drive capability of 450mA while
consuming only 5mA of supply current per amplifier and
operating from a single 5V to 12V supply.
• Drives up to 450mA from a +12V supply
The EL8108 is available in the industry standard 8 Ld SOIC
as well as the thermally-enhanced 16 Ld QFN package. Both
are specified for operation over the full -40°C to +85°C
temperature range. The EL8108 has control pins C0 and C1
for controlling the bias and enable/disable of the outputs.
The EL8108 is ideal for driving multiple video loads while
maintaining linearity.
• 20VP-P differential output drive into 100
• -85dBc typical driver output distortion at full output at
150kHz
• -70dBc typical driver output distortion at 3.75MHz
• Low quiescent current of 5mA per amplifier
• 300MHz bandwidth
• Pb-free available (RoHS compliant)
Applications
• Video distribution amplifiers
Pinouts
TABLE 1.
EL8108
(8 LD SOIC)
TOP VIEW
OUTA 1
INA- 2
+
+
GND 4
0.03
0.01
1
0.05
0.02
7 OUTB
2
2
0.06
0.03
3
2
0.08
0.03
3
3
0.11
0.03
2
0
0.04
0.01
3
0
0.05
0.02
4
0
0.07
0.02
5
0
0.08
0.03
6
0
0.10
0.03
5 INB+
12
AMP B
11
+
10
POWER
CONTROL
9
LOGIC
1
NC
INBINB+
C1
C0 8
VS- 7
NC 6
NC 5
GND 4
0.01
1
AMP A
+
INA+ 3
DIFF PHASE
0.03
2
13 OUTB
14 VS+
15 NC
16 OUTA
INA- 2
DIFF GAIN
0
1
EL8108
(16 LD QFN)
TOP VIEW
NC 1
150
1
8 VS
6 INB-
INA+ 3
150
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2007, 2008. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL8108
Ordering Information
PART NUMBER
PART MARKING
TEMPERATURE RANGE
(°c)
PACKAGE
PKG. DWG. #
EL8108IS
8108IS
-40 to +85
8 Ld SOIC
MDP0027
EL8108IS-T7*
8108IS
-40 to +85
8 Ld SOIC
MDP0027
EL8108IS-T13*
8108IS
-40 to +85
8 Ld SOIC
MDP0027
EL8108ISZ (Note)
8108ISZ
-40 to +85
8 Ld SOIC
(Pb-free)
MDP0027
EL8108ISZ-T7* (Note)
8108ISZ
-40 to +85
8 Ld SOIC
(Pb-free)
MDP0027
EL8108ISZ-T13* (Note)
8108ISZ
-40 to +85
8 Ld SOIC
(Pb-free)
MDP0027
EL8108IL
8108IL
-40 to +85
16 Ld 4x4 QFN
MDP0046
EL8108IL-T7*
8108IL
-40 to +85
16 Ld 4x4 QFN
MDP0046
EL8108IL-T13*
8108IL
-40 to +85
16 Ld 4x4 QFN
MDP0046
EL8108ILZ
(Note)
8108ILZ
-40 to +85
16 Ld 4x4 QFN
(Pb-free)
MDP0046
EL8108ILZ-T7*
(Note)
8108ILZ
-40 to +85
16 Ld 4x4 QFN
(Pb-free)
MDP0046
EL8108ILZ-T13*
(Note)
8108ILZ
-40 to +85
16 Ld 4x4 QFN
(Pb-free)
MDP0046
* Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100%
matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and 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-020.
2
FN7417.2
January 29, 2008
EL8108
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
VS+ Voltage to Ground . . . . . . . . . . . . . . . . . . . . . . -0.3V to +13.2V
VIN+ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS+
Current into any Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mA
Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA
Ambient Operating Temperature Range . . . . . . . . . .-40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-60°C to +150°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
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
VS = 12V, RF = 750, RL = 100 connected to mid supply, TA = +25°C, unless otherwise specified.
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
AC PERFORMANCE
BW
HD
-3dB Bandwidth
Total Harmonic Distortion, Differential
RF = 500, AV = +2
200
MHz
RF = 500, AV = +4
150
MHz
-83
dBc
-70
dBc
f = 200kHz, VO = 16VP-P, RL = 50
-72
f = 4MHz, VO = 2VP-P, RL = 100
SR
Slew Rate, Single-ended
f = 8MHz, VO = 2VP-P, RL = 100
-60
dBc
f = 16MHz, VO = 2VP-P, RL = 100
-50
dBc
VOUT from -3V to +3V
600
800
1100
V/µs
DC PERFORMANCE
VOS
Offset Voltage
-25
+25
mV
VOS
VOS Mismatch
-3
+3
mV
ROL
Transimpedance
1.4
2.5
M
VOUT from -4.5V to +4.5V
0.7
INPUT CHARACTERISTICS
IB+
Non-inverting Input Bias Current
-5
5
µA
IB-
Inverting Input Bias Current
-20
5
+20
µA
IB-
IB- Mismatch
-18
0
+18
µA
eN
Input Noise Voltage
6
nV Hz
iN
-Input Noise Current
13
pA/ Hz
±5
V
VS = ±6V, RL = 25to GND
±4.7
V
Output Current
RL = 0
450
mA
VS
Supply Voltage
Single supply
4.5
IS (EL8108IS only)
Supply Current, Maximum Setting
All outputs at mid supply
11
All outputs at 0V, C0 = C1 = 0V
IS+ (Medium Power) Positive Supply Current per Amplifier
IS+ (Low Power)
Positive Supply Current per Amplifier
OUTPUT CHARACTERISTICS
VOUT
IOUT
Loaded Output Swing (Single-ended)
VS = ±6V, RL = 100 to GND
±4.8
SUPPLY
13
V
14.3
18
mA
11
14.3
18
mA
All outputs at 0V, C0 = 5V, C1 = 0V
7
8.9
11
mA
All outputs at 0V, C0 = 0V, C1 = 5V
3.7
4.5
5.5
mA
0.1
0.5
mA
125
160
µA
+5
µA
SUPPLY (EL8108IL ONLY)
IS+ (Full Power)
Positive Supply Current per Amplifier
IS+ (Power Down)
Positive Supply Current per Amplifier
All outputs at 0V, C0 = C1 = 5V
IINH, C0 or C1
C0, C1 Input Current, High
C0, C1 = 5V
90
IINL, C0 or C1
C0, C1 Input Current, Low
C0, C1 = 0V
-5
3
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
22
22
VS = ±6V, AV = 5
20 RL = 100 DIFF
VS = ±6V, AV = 5
20 RL = 100 DIFF
18
14
12
RF = 750
10
RF = 1k
8
6
4
10M
FREQUENCY (Hz)
100M
2
100k
500M
18
22
GAIN (dB)
GAIN (dB)
RF = 750
10
RF = 1k
12
4
10
8
100k
500M
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (1/2 POWER MODE)
RF = 1k
10M
FREQUENCY (Hz)
1M
100M
500M
FIGURE 4. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (FULL POWER MODE)
28
28
24
24
VS = ±6V, AV = 10
26 RL = 100 DIFF
VS = ±6V, AV = 10
26 RL = 100 DIFF
RF = 243
20
RF = 500
18
RF = 750
16
RF = 1k
14
18
RF = 243
16
14
12
10
10
100M
500M
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (3/4 POWER MODE)
4
RF = 750
20
12
10M
FREQUENCY (Hz)
RF = 500
22
GAIN (dB)
22
1M
RF = 750
16
6
100M
RF = 500
18
14
10M
FREQUENCY (Hz)
RF = 243
20
8
8
100k
500M
24
RF = 243
1M
100M
VS = ±6V, AV = 10
26 RL = 100 DIFF
RF = 500
14
2
100k
10M
FREQUENCY (Hz)
1M
28
16
12
RF = 1k
FIGURE 2. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (3/4 POWER MODE)
22
VS = ±6V, AV = 5
20 RL = 100 DIFF
RF = 750
10
8
FIGURE 1. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (FULL POWER MODE)
GAIN (dB)
12
4
1M
RF = 500
14
6
2
100k
RF = 243
16
RF = 500
GAIN (dB)
GAIN (dB)
18
RF = 243
16
8
100k
RF = 1k
1M
10M
FREQUENCY (Hz)
100M
500M
FIGURE 6. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF (1/2 POWER MODE)
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
VS = ±6V
14 A = 2
V
12 RL = 100 DIFF
NORMALIZED GAIN (dB)
8
RF = 248
10
GAIN (dB)
(Continued)
RF = 500
8
6
4
RF = 1k
2
RF = 750
0
-2
6
VS = ±6V
AV = 2
RF = 500
4
2
RL = 150
0
-2
-4
RL = 25
-6
RL = 50
-8
100k
1M
10M
100M
500M
100k
1M
FREQUENCY (Hz)
FIGURE 7. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF
EL8108IL
EL8108IS
-60
-65
-70
HD (dB)
HD (dB)
VS = ±6V
AV = 5
-55 R = 50 DIFF
L
RF = 750
EL8108IL
EL8108IS
3rd HD
-65
3rd HD
-70
-75
-75
-80
2nd HD
2nd HD
1
2
3
4
5
6
VOP-P (V)
7
8
-80
9
FIGURE 9. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 2MHz
1
2
3
4
5
6
VOP-P (V)
7
8
9
FIGURE 10. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 3MHz
-40
-40
VS = ±6V
AV = 5
-45
RL = 50 DIFF
RF = 750
-50
VS = ±6V
AV = 5
-45 RL = 50 DIFF
RF = 750
EL8108IL
EL8108IS
EL8108IL
EL8108IS
3rd HD
3rd HD
-55
HD (dB)
HD (dB)
500M
-50
VS = ±6V
A =5
-55 V
RL = 50 DIFF
RF = 750
-60
-60
-50
-55
-65
2nd HD
-60
-70
-75
100M
FIGURE 8. FREQUENCY RESPONSE FOR VARIOUS RLOAD
-50
-85
10M
FREQUENCY (Hz)
2nd HD
1
2
3
4
5
6
VOP-P (V)
7
8
9
FIGURE 11. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 5MHz
5
-65
1
2
3
4
5
6
VOP-P (V)
7
8
9
FIGURE 12. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 10MHz
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
(Continued)
-70
-60
-80
-70
VS = ±6V
AV = 5
-65 R = 750
F
VOP-P = 4V
HD (dB)
HD (dB)
VS = ±6V
AV = 5
-75 R = 750
F
VOP-P = 4V
2nd HD
-85
3rd HD
-75
-90
-80
-95
-85
3rd HD
2nd HD
-100
50
60
70
80
90 100 110
RLOAD ()
120
130
140
FIGURE 13. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD
@ 2MHz (EL8108IL)
-50
-90
50
150
-60
-50
HD (dB)
HD (dB)
120
130
140
150
VS = ±6V
AV = 5
RF = 750
VOP-P = 4V
3rd HD
-55
3rd HD
-75
-80
-60
-65
-70
2nd HD
-85
2nd HD
-75
60
70
80
90 100 110
RLOAD ()
120
130
140
-80
50
150
FIGURE 15. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD
@ 5MHz (EL8108IL)
70
80
90 100 110
RLOAD ()
120
130
140
150
24
VS = ±6V, AV = 5
22 RL = 50
20 RF = 750
18
GAIN (dB)
16
CL = 33pF
14
12
10
10M
FREQUENCY (Hz)
12
CL = 12pF
6
100M
500M
FIGURE 17. FREQUENCY RESPONSE WITH VARIOUS CL
6
CL = 39pF
14
8
CL = 22pF
6
16
10
CL = 0pF
8
CL = 47pF
18
CL = 47pF
1M
60
FIGURE 16. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD
@ 10MHz (EL8108IL)
VS = ±6V, AV = 5
22 R = 50
L
20 RF = 750
GAIN (dB)
90 100 110
RLOAD ()
-45
-70
0
100k
80
-40
-65
-90
50
70
FIGURE 14. 2nd AND 3rd HARMONIC DISTORTION vs RLOAD
@ 3MHz (EL8108IL)
VS = ±6V
AV = 5
RF = 750
VOP-P = 4V
-55
60
4
100k
CL = 0pF
1M
10M
FREQUENCY (Hz)
100M
500M
FIGURE 18. FREQUENCY RESPONSE vs VARIOUS CL
(3/4 POWER MODE)
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
(Continued)
24
-10
GAIN (dB)
18
CHANNEL SEPARATION (dB)
VS = ±6V, AV = 5
22 RL = 50
20 RF = 750
CL = 47pF
16
CL = 37pF
14
12
CL = 12pF
10
8
CL = 0pF
-30
-50
A
-70
B
B
A
-90
6
4
100k
10M
FREQUENCY (Hz)
1M
100M
-110
10k
500M
FIGURE 19. FREQUENCY RESPONSE WITH VARIOUS CL
(1/2 POWER MODE)
100k
1M
FREQUENCY (Hz)
10M
FIGURE 20. CHANNEL SEPARATION vs FREQUENCY
10M
200
3M
-30
MAGNITUDE ()
PSRR-
-50
150
300k
PSRR+
-70
-90
PHASE
100k
GAIN
100
50
30k
0
10k
-50
3k
-100
1k
-150
PHASE (°)
-10
PSRR (dB)
100M
-200
-110
100k
1M
10M
FREQUENCY (Hz)
-110
100M 200M
10M
1000
100k
1M
FREQUENCY (Hz)
10M
100M
VS = ±6V, AV = 1
RF = 750
100
EN
10
1
0.1
IN0.01
0.001
0.0001
10
10k
FIGURE 22. TRANSIMPEDANCE (ROL) vs FREQUENCY
OUTPUT IMPEDANCE ()
VOLTAGE/CURRENT NOISE (nV/Hz)(nA/Hz)
FIGURE 21. PSRR vs FREQUENCY
1k
10
1
0.1
IN+
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
FIGURE 23. VOLTAGE AND CURRENT NOISE vs FREQUENCY
7
10k
100k
1M
FREQUENCY (Hz)
10M
100M
FIGURE 24. OUTPUT IMPEDANCE vs FREQUENCY
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
(Continued)
150
130
0.40
AV = 5, RF = 750
RLOAD = 100 DIFF
DIFFERENTIAL GAIN (%)
120
BW (MHz)
110
100
90
FULL POWER MODE
3/4 POWER MODE
80
70
1/2 POWER MODE
60
50
3.0
3.5
VS = ±6V
0.35
4.0
4.5
5.0
0.30
1/2 POWER MODE
0.25
0.20
0.15
0.10
3/4 POWER MODE
FULL POWER MODE
0.05
5.5
0
6.0
1
2
±VS (V)
FIGURE 25. DIFFERENTIAL BANDWIDTH vs SUPPLY VOLTAGE
FIGURE 26. DIFFERENTIAL GAIN
VS = ±6V
0.08
14
0.07
12
FULL POWER MODE
0.05
6
0.03
4
3/4 POWER MODE
0.02
2
0.01
0
1
2
3
3/4 POWER MODE
8
0.04
1/2 POWER MODE
FULL POWER MODE
10
IS (mA)
0.06
4
1/2 POWER MODE
+IS
-IS
1
3
2
FIGURE 27. DIFFERENTIAL PHASE
6
FIGURE 28. SUPPLY CURRENT vs SUPPLY VOLTAGE
1.8k
1
1.7k
0
IB+
SLEW RATE (V/µs)
INPUT BIAS CURRENT (µA)
5
4
±VS (V)
# OF 150 LOADS
-1
-2
IB-3
-4
-5
4
16
0.09
DIFFERENTIAL PHASE (%)
3
# OF 150 LOADS
1.6k
1.5k
1.4k
1.3k
0
25
50
75
100
TEMPERATURE (°C)
125
150
FIGURE 29. INPUT BIAS CURRENT vs TEMPERATURE
8
1.2k
-50
-25
0
25
50
75
100
125
150
TEMPERATURE (°C)
FIGURE 30. SLEW RATE vs TEMPERATURE
FN7417.2
January 29, 2008
EL8108
(Continued)
5
3.0
4
2.5
TRANSIMPEDANCE (M)
OFFSET VOLTAGE (mV)
Typical Performance Curves
3
2
1
0
-1
-50
2.0
1.5
1.0
0.5
-25
0
25
50
75
100
125
0
-50
150
-25
25
0
TEMPERATURE (°C)
FIGURE 31. OFFSET VOLTAGE vs TEMPERATURE
100
125
150
16.0
RLOAD=100
5.05 VS=±6V
SUPPLY CURRENT (mA)
15.5
5.00
4.95
4.90
4.85
4.80
15.0
14.5
14.0
13.5
13.0
12.5
-25
0
25
50
75
TEMPERATURE (°C)
100
125
12.0
-50
150
FIGURE 33. OUTPUT VOLTAGE vs TEMPERATURE
3
-25
25
50
75
TEMPERATURE (°C)
0
100
125
150
FIGURE 34. SUPPLY CURRENT vs TEMPERATURE
AV = 5
RF = 750
RL = 100 DIFF
2
PEAKING (dB)
OUTPUT VOLTAGE (±V)
75
FIGURE 32. TRANSIMPEDANCE vs TEMPERATURE
5.10
4.75
-50
50
TEMPERATURE (°C)
1
0
-1
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VS (±V)
FIGURE 35. DIFFERENTIAL PEAKING vs SUPPLY VOLTAGE
9
FN7417.2
January 29, 2008
EL8108
Typical Performance Curves
(Continued)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
3.5
1.4
3.0
1.2
POWER DISSIPATION (W)
POWER DISSIPATION (W)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY (4-LAYER) TEST BOARD
2.5
2.0
1.5
1.136W
SO8
1.0
+1 1 0
0.5
°C/W
1.0
781mW
0.8
J
A=
0.6
60
°C
0.4
/W
0.2
0
0
0
50
25
75 85 100
125
0
150
25
FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
1.2
4.5
POWER DISSIPATION (W)
4.0
3.125W
3.0
QFN16
JA = +40°C/W
2.5
2.0
1.5
1.0
0.5
0
75 85 100
125
150
FIGURE 37. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - LPP EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5
3.5
50
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
POWER DISSIPATION (W)
SO
8
+1
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.0
833mW
QFN16
0.8
JA = +150°C/W
0.6
0.4
0.2
0
0
25
75 85
50
100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 38. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
Applications Information
Product Description
The EL8108 is a dual current feedback operational amplifier
designed for video distribution solutions. It is a dual current
mode feedback amplifier with low distortion while drawing
moderately low supply current. It is built using Intersil’s
proprietary complimentary bipolar process and is offered in
industry standard pinouts. Due to the current feedback
architecture, the EL8108 closed-loop 3dB bandwidth is
dependent on the value of the feedback resistor. First the
desired bandwidth is selected by choosing the feedback
resistor, RF, and then the gain is set by picking the gain
resistor, RG. The curves at the beginning of the “Typical
Performance Curves” on page 4 show the effect of varying
both RF and RG. The 3dB bandwidth is somewhat
dependent on the power supply voltage.
10
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 39. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
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, below ¼”. The power supply
pins must be well bypassed to reduce the risk of oscillation.
A 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic
capacitor is adequate for each supply pin.
For good AC performance, parasitic capacitances should be
kept to a minimum, especially at the inverting input. This
implies keeping the ground plane away from this pin. Carbon
resistors are acceptable, while use of wire-wound resistors
should not be used because of their parasitic inductance.
Similarly, capacitors should be low inductance for best
performance.
FN7417.2
January 29, 2008
EL8108
Capacitance at the Inverting Input
Single Supply Operation
Due to the topology of the current feedback amplifier, stray
capacitance at the inverting input will affect the AC and
transient performance of the EL8108 when operating in the
non-inverting configuration.
If a single supply is desired, values from +5V to +12V can be
used as long as the input common mode range is not
exceeded. When using a single supply, be sure to either:
In the inverting gain mode, added capacitance at the
inverting input has little effect since this point is at a virtual
ground and stray capacitance is therefore not “seen” by the
amplifier.
Feedback Resistor Values
The EL8108 has been designed and specified with
RF = 500 for AV = +2. This value of feedback resistor yields
extremely flat frequency response with little to no peaking
out to 200MHz. As is the case with all current feedback
amplifiers, wider bandwidth, at the expense of slight
peaking, can be obtained by reducing the value of the
feedback resistor. Inversely, larger values of feedback
resistor will cause rolloff to occur at a lower frequency. See
“Typical Performance Curves” beginning on page 4, which
show 3dB bandwidth and peaking vs frequency for various
feedback resistors and various supply voltages.
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently
3dB bandwidth drop off at high temperature, the EL8108 was
designed to have little supply current variations with
temperature. An immediate benefit from this is that the 3dB
bandwidth does not drop off drastically with temperature.
1. DC bias the inputs at an appropriate common mode
voltage and AC couple the signal, or
2. Ensure the driving signal is within the common mode
range of the EL8108.
Driving Cables and Capacitive Loads
The EL8108 was designed with driving multiple coaxial
cables in mind. With 450mA of output drive and low output
impedance, driving six, 75 double terminated coaxial
cables to ±11V with one EL8108 is practical.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back termination series resistor will
decouple the EL8108 from the capacitive cable and allow
extensive capacitive drive.
Other applications may have high capacitive loads without
termination resistors. In these applications, an additional
small value (5 to 50) resistor in series with the output will
eliminate most peaking.
The following schematic show the EL8108 driving 6 double
terminated cables, each an average length of 50 ft.
Supply Voltage Range
The EL8108 has been designed to operate with supply
voltages from ±2.5V to ±6V. Optimum bandwidth, slew rate,
and video characteristics are obtained at higher supply
voltages. However, at ±2.5V supplies, the 3dB bandwidth at
AV = +5 is a respectable 200MHz.
11
FN7417.2
January 29, 2008
EL8108
+5V
EL8108
-5V
750
750
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9001 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.
For information regarding Intersil Corporation and its products, see www.intersil.com
12
FN7417.2
January 29, 2008
EL8108
Small Outline Package Family (SO)
A
D
h X 45°
(N/2)+1
N
A
PIN #1
I.D. MARK
E1
E
c
SEE DETAIL “X”
1
(N/2)
B
L1
0.010 M C A B
e
H
C
A2
GAUGE
PLANE
SEATING
PLANE
A1
0.004 C
0.010 M C A B
L
b
0.010
4° ±4°
DETAIL X
MDP0027
SMALL OUTLINE PACKAGE FAMILY (SO)
INCHES
SYMBOL
SO-14
SO16 (0.300”)
(SOL-16)
SO20
(SOL-20)
SO24
(SOL-24)
SO28
(SOL-28)
TOLERANCE
NOTES
A
0.068
0.068
0.068
0.104
0.104
0.104
0.104
MAX
-
A1
0.006
0.006
0.006
0.007
0.007
0.007
0.007
0.003
-
A2
0.057
0.057
0.057
0.092
0.092
0.092
0.092
0.002
-
b
0.017
0.017
0.017
0.017
0.017
0.017
0.017
0.003
-
c
0.009
0.009
0.009
0.011
0.011
0.011
0.011
0.001
-
D
0.193
0.341
0.390
0.406
0.504
0.606
0.704
0.004
1, 3
E
0.236
0.236
0.236
0.406
0.406
0.406
0.406
0.008
-
E1
0.154
0.154
0.154
0.295
0.295
0.295
0.295
0.004
2, 3
e
0.050
0.050
0.050
0.050
0.050
0.050
0.050
Basic
-
L
0.025
0.025
0.025
0.030
0.030
0.030
0.030
0.009
-
L1
0.041
0.041
0.041
0.056
0.056
0.056
0.056
Basic
-
h
0.013
0.013
0.013
0.020
0.020
0.020
0.020
Reference
-
16
20
24
28
Reference
-
N
SO-8
SO16
(0.150”)
8
14
16
Rev. M 2/07
NOTES:
1. Plastic or metal protrusions of 0.006” maximum per side are not included.
2. Plastic interlead protrusions of 0.010” maximum per side are not included.
3. Dimensions “D” and “E1” are measured at Datum Plane “H”.
4. Dimensioning and tolerancing per ASME Y14.5M-1994
13
FN7417.2
January 29, 2008
EL8108
QFN (Quad Flat No-Lead) Package Family
MDP0046
QFN (QUAD FLAT NO-LEAD) PACKAGE FAMILY
(COMPLIANT TO JEDEC MO-220)
A
MILLIMETERS
D
N
(N-1)
(N-2)
B
1
2
3
PIN #1
I.D. MARK
E
(N/2)
2X
0.075 C
2X
0.075 C
N LEADS
TOP VIEW
0.10 M C A B
(N-2)
(N-1)
N
b
L
SYMBOL QFN44 QFN38
TOLERANCE
NOTES
A
0.90
0.90
0.90
0.90
±0.10
-
A1
0.02
0.02
0.02
0.02
+0.03/-0.02
-
b
0.25
0.25
0.23
0.22
±0.02
-
c
0.20
0.20
0.20
0.20
Reference
-
D
7.00
5.00
8.00
5.00
Basic
-
Reference
8
Basic
-
Reference
8
Basic
-
D2
5.10
3.80
5.80 3.60/2.48
E
7.00
7.00
8.00
1
2
3
6.00
E2
5.10
5.80
5.80 4.60/3.40
e
0.50
0.50
0.80
0.50
L
0.55
0.40
0.53
0.50
±0.05
-
N
44
38
32
32
Reference
4
ND
11
7
8
7
Reference
6
NE
11
12
8
9
Reference
5
MILLIMETERS
PIN #1 I.D.
3
QFN32
SYMBOL QFN28 QFN24
QFN20
QFN16
A
0.90
0.90
0.90
0.90
0.90
±0.10
-
A1
0.02
0.02
0.02
0.02
0.02
+0.03/
-0.02
-
b
0.25
0.25
0.30
0.25
0.33
±0.02
-
c
0.20
0.20
0.20
0.20
0.20
Reference
-
D
4.00
4.00
5.00
4.00
4.00
Basic
-
D2
2.65
2.80
3.70
2.70
2.40
Reference
-
(E2)
(N/2)
NE 5
7
(D2)
BOTTOM VIEW
0.10 C
e
C
SEATING
PLANE
TOLERANCE NOTES
E
5.00
5.00
5.00
4.00
4.00
Basic
-
E2
3.65
3.80
3.70
2.70
2.40
Reference
-
e
0.50
0.50
0.65
0.50
0.65
Basic
-
L
0.40
0.40
0.40
0.40
0.60
±0.05
-
N
28
24
20
20
16
Reference
4
ND
6
5
5
5
4
Reference
6
NE
8
7
5
5
4
Reference
5
Rev 11 2/07
0.08 C
N LEADS
& EXPOSED PAD
SEE DETAIL "X"
NOTES:
1. Dimensioning and tolerancing per ASME Y14.5M-1994.
2. Tiebar view shown is a non-functional feature.
SIDE VIEW
3. Bottom-side pin #1 I.D. is a diepad chamfer as shown.
4. N is the total number of terminals on the device.
(c)
C
5. NE is the number of terminals on the “E” side of the package
(or Y-direction).
2
A
(L)
A1
N LEADS
DETAIL X
6. ND is the number of terminals on the “D” side of the package
(or X-direction). ND = (N/2)-NE.
7. Inward end of terminal may be square or circular in shape with radius
(b/2) as shown.
8. If two values are listed, multiple exposed pad options are available.
Refer to device-specific datasheet.
14
FN7417.2
January 29, 2008
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