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PDF ISL59837 Data sheet ( Hoja de datos )
| Número de pieza | ISL59837 | |
| Descripción | 200MHz Single Supply Video Driver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
March 5, 2007
ISL59837
FN6335.1
200MHz Single Supply Video Driver With
Charge Pump and Power Down
The ISL59837 is a revolutionary device that allows true single-
supply operation of video amplifiers. Designed for systems
requiring output swing below ground but lacking a negative
power supply, the ISL59837 generates the required negative
rail internally from a +3.3V power supply. This allows for
DC-accurate coupling of video onto a 75Ω double-terminated
line. The buffers have an integrated 6dB, eliminating the need
for external gain-setting resistors. An external reference
voltage can be applied to the REF pin to shift the analog video
level down by the desired amount. The charge pump and
amplifiers can be placed in a power down mode, consuming
less than 1mA of current.
Ordering Information
PART NUMBER PART TAPE & PACKAGE PKG.
(Note)
MARKING REEL (Pb-free) DWG. #
ISL59837IAZ 59837 IAZ
- 16 Ld QSOP MDP0040
ISL59837IAZ-T7 59837 IAZ
7” 16 Ld QSOP MDP0040
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material 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
• Generates negative rail from from single +3.3V supply
• No output DC blocking capacitor needed
• 200MHz -3dB bandwidth
• 50MHz 0.1dB bandwidth
• Fixed gain of 2 output buffer
• Charge pump power down function (0.1mA typical)
• Outputs are high impedance in power-down mode
• Amplifier enable/disable function control
• Pb-free plus anneal available (RoHS compliant)
Applications
• Driving video
Pinout
ISL59837
(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. 2007. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL59837
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 ENABLED
-70
-80 DISABLED
-90
-100
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 6. INPUT TO OUTPUT ISOLATION vs FREQUENCY
120
AV = +2
100 RL = 500Ω
80
60
40
20
0
1.0 1.5 2.0 2.5 3.0 3.5
SUPPLY VOLTAGE (V)
FIGURE 7. SUPPLY CURRENT vs SUPPLY VOLTAGE
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
5
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
100
10
1
0.1
0.01
10k 100k
1M
10M
100M
FREQUENCY (Hz)
FIGURE 10. OUTPUT IMPEDANCE vs FREQUENCY
FN6335.1
March 5, 2007
5 Page 
ISL59837
Description of Operation and Application
Information
Theory Of Operation
The ISL59837 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 from 0V to 3.3V,
the ISL59837 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 ISL59837 fabricated on a di-electrically 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
ISL59837 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 by essentially 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 ISL59837 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 ISL59837 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 ISL59837
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. SIMPLIFIED SCHEMATIC
11
OUT
FN6335.1
March 5, 2007
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ISL59837.PDF ] | |
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