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PDF ISL59830A Data sheet ( Hoja de datos )
| Número de pieza | ISL59830A | |
| Descripción | True Single Supply Video Driver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
September 26, 2006
ISL59830A
FN6233.3
True Single Supply Video Driver With
Power Down
The ISL59830A is a revolutionary device that allows true
single-supply operation of video amplifiers. The device runs
off a single 3.3V supply and generates the required negative
voltage internally. This allows for DC-accurate coupling of
video onto a 75Ω double-terminated line. Since the buffers
have an integrated 6dB gain, the only external components
required are the 75Ω termination resistors and a small
capacitor. An input reference voltage can be supplied to shift
the analog video level down by an amount equal to the
reference (typically 0.6V).
Ordering Information
PART NUMBER
PART
MARKING
TAPE
&
REEL
PACKAGE
PKG.
DWG. #
ISL59830AIAZ
(See Note)
59830AIAZ
- 16 Ld QSOP M16.15A
(Pb-free)
ISL59830AIAZ-T7 59830AIAZ
(See Note)
13” 16 Ld QSOP M16.15A
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
www.DataSheet4U.comm aterial sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Features
• Triple single-supply buffer
• Operates from single +3.3V supply
• No output DC blocking capacitor needed
• Fixed gain of 2 output buffer
• Output three-statable
• Enable/disable function
• Charge pump power down function
• 50MHz 0.1dB bandwidth
• 200MHz -3dB bandwidth
• Pb-free plus anneal available (RoHS compliant)
Applications
• Driving video
Pinout
ISL59830A
(16 LD QSOP)
TOP VIEW
RIN 1
GIN 2
BIN 3
REF 4
VEE 5
GND 6
VEEOUT 7
DGND 8
16 ROUT
15 GOUT
14 BOUT
13 VCC
12 EN
11 VCC
10 PD
9 DVCC
1 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. 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL59830A
Typical Performance Curves (Continued)
-30
AV=+2
-40 RL=500Ω
-50
-60
-70 ENABLED
-80
-90 DISABLED
-100
-110
-120
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 5. CROSS TALK CHANNEL TO CHANNEL (TYPICAL)
-20
AV=+2
-30 RL=500Ω
-40
-50
-60
-70
-80
-90
-100
100K
1M
ENABLED
DISABLED
10M
100M
1G
FREQUENCY (Hz)
FIGURE 6. INPUT TO OUTPUT ISOLATION vs FREQUENCY
120
AV=+2
100 RL=500Ω
80
60
40
20
0
1 1.5 2 2.5 3 3.5
SUPPLY VOLTAGE (V)
FIGURE 7. SUPPLY CURRENT vs SUPPLY VOLTAGE
200
-3dB
160
120
AV=+2
RL=500Ω
80
40
-0.1dB
0
27 47.5 68 88.5 109 129.5 150
TEMPERATURE (°C)
FIGURE 8. BANDWIDTH vs TEMPERATURE
95
AV=+2
RL=500Ω
90
85
80
75
27
55.6
84.2 112.8 141.4
170
TEMPERATURE (°C)
FIGURE 9. SUPPLY CURRENT vs TEMPERATURE
100
10
1
0.1
0.01
10K
100K
1M
10M
100M
FREQUENCY (Hz)
FIGURE 10. OUTPUT IMPEDANCE vs FREQUENCY
5 FN6233.3
September 26, 2006
5 Page 
ISL59830A
Description of Operation and Application
Information
Theory Of Operation
The ISL59830A is a highly practical and robust marriage of
three high bandwidth, high speed, low power, rail-to-rail
voltage feedback amplifiers with a charge pump, to provide a
negative rail without an additional power supply. Designed to
operate with a single supply voltage range of from 0V to
3.3V, the ISL59830A eliminates the need for a split supply
with the incorporation of a charge pump capable of
generating a bottom rail as much as 1.6V below ground; for
a 4.9V range on a single 3.3V supply. This performance is
ideal for NTSC video with its negative-going sync pulses.
The Amplifier
The ISL59830A fabricated on a dielectrically isolated high
speed 5V Bi-CMOS process with 4GHz PNPs and NPN
transistor exceeding 20GHz - perfect for low distortion, low
power demand and high frequency circuits. While the
ISL59830A utilizes somewhat standard voltage mode
feedback topologies, there are many non-standard analog
features providing its outstanding bandwidth, rail-to-rail
operation, and output drive capabilities. The input signal
initially passes through a folded cascode, a topology
providing enhanced frequency response essentially by fixing
the base collector voltage at the junction of the input and
gain stage. The collector of each input device looks directly
into an emitter that is tied closely to ground through a
resistor and biased with a very stable DC source. Since the
voltage of this collector is "locked stable" the effective
bandwidth limiting of the Miller capacitance is greatly
reduced. The signal is then passed through a second fully-
realized differential gain stage and finally through a
proprietary common emitter output stage for improved rail-
to-rail output performance. The result is a highly-stable, low
distortion, low power, and high frequency amplifier capable
of driving moderately capacitive loads with near rail-to-rail
performance.
Input Output Range
The three amplifier channels have an input common mode
voltage range from 0.15V below the bottom rail to within
100mV of the positive supply, VS+ pin (Note: bottom rail is
established by the charge pump at negative one half the
positive supply). As the input signal moves outside the
specified range, the output signal will exhibit increasingly
higher levels of harmonic distortion. And of course, as load
resistance becomes lower, the current drive capability of the
device will be challenged and its ability to drive close to each
rail is reduced. For instance, with a load resistance of 1kΩ
the output swing is within 100mV of the rails, while a load
resistance of 150Ω limits the output swing to within around
300mV of the rails.
Amplifier Output Impedance
To achieve near rail-to-rail performance, the output stage of
the ISL59830A uses transistors in the common emitter
configuration, typically producing higher output impedance
than the standard emitter follower output stage. The
exceptionally high open loop gain of the ISL59830A and
local feedback reduces output impedance to less than 2Ω at
low frequency. However, since output impedance of the
device is exponentially modulated by the magnitude of the
open loop gain, output impedance increases with frequency
as the open loop gain decreases with frequency. This
inductive-like effect of the output impedance is countered in
the ISL59830A with proprietary output stage topology,
keeping the output impedance low over a wide frequency
range and making it possible to easily and effectively drive
relatively heavy capacitive loads (See Figure 10).
IN+
BIAS
IN-
FIGURE 27.
11
OUT
FN6233.3
September 26, 2006
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL59830A.PDF ] | |
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