ISL59110 Datasheet, PDF (7/10 Pages) Intersil Corporation – 8MHz Rail-to-Rail Composite Video Driver

ISL59110
Typical Performance Curves
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.5
0.45
450mW
0.4
0.35
0.3
0.25
0.2
θ_{JA =22S0C°C70/W-6}
0.15
0.1
0.05
0
0
25
50
75 85 100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.55
0.5
500mW
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
25
50
75 85 100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 23. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
SYNC CLAMP
V_DD
V_DD
V_DD
+
-
C_{IN IN}
R₁
IN
R_IN ^100nF
SALLEN KEY LOW PASS FILTER
C₂
R₂
R₃
V_DC
+
-
C₁
C₃
EN
GND
EN=GND: SHUTDOWN I_DD~0
EN=V_DD: ACTIVE I_DD~1.5mA
SAG
AC COUPLING
NETWORK CAPACITOR
OUT
R₆
R_{7 SAG}
C₅
47uF
C₄
R_OUT
75Ω _RL
75Ω
22uF
R₅
R₄
FIGURE 24. BLOCK DIAGRAM
Application Information
The ISL59110 is a single supply rail-to-rail output amplifier
achieving a -3dB bandwidth of around 8MHz and slew rate
of about 40V/µs while demanding only 2mA of supply
current. This part is ideally suited for applications with
specific micropower consumption and high bandwidth
demands. As the performance characteristics above and the
features described below, the ISL59110 is designed to be
very attractive for portable composite video applications.
The ISL59110 features a sync clamp, low pass function, and
SAG network at the output facilitating reduction of typically
large AC coupling capacitors. See Figure 24.
Internal Sync Clamp
The typical embedded video DAC operates from a ground
referenced single supply. This becomes an issue because
the lower level of the sync pulse output may be at a 0V
reference level to some positive level. The problem is
presenting a 0V input to most single supply driven amplifiers
will saturate the output stage of the amplifier resulting in a
7
FN6104.1
August 8, 2005