MAX7438ETP-T Maxim Integrated, MAX7438ETP-T Datasheet - Page 8

• Manufacturer Part Number: MAX7438ETP-T
• Description: Active Filter
• Manufacturer: Maxim Integrated

Specifications of MAX7438ETP-T

• Number Of Channels: 3
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFN EP-20
• Minimum Operating Temperature: - 40 C

Use a DAC output to control the bypass and high-fre-
quency boost levels on each channel (see Figure 2).
Set the DAC output voltage to the corresponding
bypass or boost levels desired (see Table 1).
Triple-Channel Video Reconstruction Filters with
Back-Porch Clamp to GND
8
Microprocessor Control of High-Frequency
_______________________________________________________________________________________
75Ω
Z
75Ω
0
= 75Ω
Z
ENCODER
0
R
R
= 75Ω
HFB1-1
HFB1-2
DAC3
DAC2
DAC1
V
CC
75Ω
75Ω
Boost and Bypass
1µF
R
R
R
T
T
T
0.1µF
10kΩ
OUT1
IN1
HFB1
V
CC
V
EXT
= +5V
CC
IN2
R
R
HFB2-1
HFB2-2
MAX7438
MAX7439
OUT2
Figure 2. DAC Control of High-Frequency Boost and Bypass
V
CC
75Ω
HFB2
75Ω
V
SS
V
IN3
HFB3
OUT3
= -5V
SS
GND
Z
0
= 75Ω
DAC
Typical Operating Circuit
8
Z
0
0.1µF
= 75Ω
75Ω
HFB_
75Ω
1µF
MAX7439
MAX7438
75Ω
75Ω
Z
0
V
= 75Ω
CC
Z
R
R
0
HFB3-1
HFB3-2
75Ω
= 75Ω
75Ω