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參數(shù)資料
| 型號： | TDA9210 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 2124K |
| 代理商： | TDA9210 |
TDA9210
7/19
4.10 - Bandwidth Adjustment
An advanced feature: Bandwidth adjustment, is
implemented on the TDA9210.
For applications where rise/fall time >5.5ns, this
feature must not be used and the bandwidth has to
be set to 0 (dec) (register 13, see Table 1 on
page 15).
For applications where rise/fall time <5.5ns, this
feature offers several advantages:
– Depending on the external capacitive load and
on the peak-to-peak output voltage, this adjust-
ment avoids getting any slew-rate phenomenon.
– Electromagnetic radiation (EMI). Slowing down
the signal of rise/fall time will decrease the EMI
without significantly deteriorating the rise/fall
time of the CRT driver.
– Video signal response. Using this adjustment will
allow to optimize the high frequency transient
phenomenons.
– Still picture mode. In this mode, high video swing
is of greater interest than rise/fall time. The band-
width adjustment can be used to avoid any slew-
rate phenomenon at the CRT driver output and to
reduce EMI.
4.11 - CRT Cathode Coupling (Figure 4)
The TDA9210 is designed to be used in DC cou-
pling mode only, enabling to build a powerful video
system on a small PCB Board and giving a sub-
stantial cost saving compared with any other solu-
tion available on the market.
The preamplifier outputs control directly the cut-off
levels.
The output DC level (VDC) is adjusted independ-
ently for each channel from 0.5 V to 2.5 V via the
registers 10, 11 and 12.
Note that bit 2 must be set to 1 and bit 3 to 0 in
Register 9.
Figure 4. DC Coupling
4.12 - Stand-by Mode
The TDA9210 has a stand-by mode. As soon as
the VCC power (Pin 17) gets lower than 3V (typ.),
the device is set in stand-by mode whatever the
voltage on analog VCCA (Pin 7) is. The analog
blocks are internally switched-off while the logic
parts (I2C bus, power-on reset) are still supplied.
In stand-by mode, the power consumption is be-
low 20 mW.
4.13 - Serial Interface
The 2-wire serial interface is an I2C interface. The
slave address of TDA9210 is DC hex.
The host MCU can write into the TDA9210 regis-
ters. Read mode is not available.
In order to write data into the TDA9210, after the
“start” message, the MCU must send the following
data (see Figure 5):
– the I2C address slave byte with a low level for the
R/W bit,
– the byte to the internal register address where
the MCU wants to write data,
– the data.
All bytes are sent with MSB bit first. The transfer of
written data is ended with a “stop” message.
When transmitting several data, the register ad-
dresses and data can be written with no need to
repeat the start and slave addresses.
OUTPUT 1,2,3 DC LEVEL
Pins 14-16-18
CRT
Driver
TDA 9210
0.5V to 2.5V (8bits)
A6
A5
A4
A3
A2
A1
A0
W
11
01110
0
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