TSH111IDT(2002) Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
TSH111IDT Datasheet PDF : 19 Pages
| |||
TSH110-TSH111-TSH112-TSH113-TSH114
The amplifier must be biased with a mid supply
(nominaly +Vcc/2), in order to maintain the DC
component of the signal at this value. Several op-
tions are possible to provide this bias supply (such
as a virtual ground using an operational amplifier),
or a two-resistance divider which is the cheapest
solution. A high resistance value is required to lim-
it the current consumption. On the other hand, the
current must be high enough to bias the non-in-
verting input of the amplifier. If we consider this
bias current (5µA) as the 1% of the current
through the resistance divider (500µA) to keep a
stable mid supply, two 5kΩ resistances can be
used.
The input provides a high pass filter with a break
frequency below 10Hz which is necessary to re-
move the original 0 volt DC component of the input
signal, and to hold it at 2.5V.
Video Multiplexing using the TSH113
(fig.35): Circuit for switching 3 video signals with the tri-
ple TSH113.
IN1
ENABLE1
RG
680Ω
+
TSH113
_
Rfb, 680Ω
Cfb, 2pF
Assuming a low level active onto the disable pins
(1,2,3) as described on page 7 of the datasheet,
any operator can be disable/enable independent-
ly. The two disabled operators will be in standby
mode featuring a high ouput impedance with a
high input/output isolation and a low quiescent
current.
(fig.36): Typical output response in standby mode on/off
Enabled
Output
Disabled
Output
-2.4V
Standby
Signal
+2.4V
100ns /div.
(fig.37): Typical output response in standby mode off/on
Enabled
Output
IN2
ENABLE2
RG
680Ω
+
TSH113
_
Rfb, 680Ω
Cfb, 2pF
75Ω
Common
75Ω
cable
OUT
75Ω
+2.4V
Standby
Signal
Disabled
Output
-2.4V
10µs /div.
IN3
ENABLE3
RG
680Ω
+
TSH113
_
Rfb, 680Ω
Cfb, 2pF
15/19
Share Link: 