max9504beutt Maxim Integrated Products, Inc., max9504beutt Datasheet - Page 12

• Manufacturer Part Number: max9504beutt
• Description: 3v/5v, 6db Video Amplifiers With High Output-current Capability
• Manufacturer: Maxim Integrated Products, Inc.

3V/5V, 6dB Video Amplifiers with
High Output-Current Capability
The MAX9504 can use the sag configuration if the out-
put requires AC-coupling and V
tion refers to the low-frequency compensation for the
highpass filter formed by the 150Ω load and the output
capacitor. In video applications, the cutoff frequency
must be less than 5Hz in order to pass the vertical sync
interval and avoid field time distortion (field tilt). In the
simplest configuration, a very large coupling capacitor
(> 220µF typically) is used to achieve the 5Hz cutoff
frequency. In the sag configuration, two smaller capaci-
tors are used to replace the very large coupling capaci-
tor (see Figure 8). For V
capacitors.
The MAX9504A/MAX9504B operate from a single 2.7V
to 5.5V supply. Bypass the supply with a 0.1µF capaci-
tor as close to V
Figure 8. SAG Correction Configuration
12
AC Output Coupling and Sag Correction
______________________________________________________________________________________
CURRENT
VIDEO
Layout and Power-Supply Bypassing
DAC
CC
possible. Maxim recommends using
150Ω
R1
CC
120pF
≥ 4.5V, C5 and C6 are 22µF
3-POLE RECONSTRUCTION LPF
C1
CC
≥ 4.5V. Sag correc-
4.7µH
6.8pF
L1
C3
C2
120pF
R2
150Ω
microstrip and stripline techniques to obtain full band-
width. To ensure that the PC board does not degrade
the device’s performance, design it for a frequency
greater than 1GHz. Pay careful attention to inputs and
outputs to avoid large parasitic capacitance. Whether
or not you use a constant-impedance board, observe
the following design guidelines:
• Do not use wire-wrap boards; they are too inductive.
• Do not use IC sockets; they increase parasitic capaci-
• Use surface-mount instead of through-hole compo-
• Use a PC board with at least two layers; it should be
• Keep signal lines as short and as straight as possible.
V
CC
tance and inductance.
nents for better, high-frequency performance.
as free from voids as possible.
Do not make 90° turns; round all corners.
SHDN
IN
MAX9504
GND
V
CC
OUT
FB
22µF
22µF
C5
C6
C7
0.1µF
75Ω
R3
V
CC
V
OUT