MAX9504B Maxim, MAX9504B Datasheet - Page 7

• Manufacturer Part Number: MAX9504B
• Description: The MAX9504A/MAX9504B 3V/5V, ground-sensing amplifiers with a fixed gain of 6dB provide high output current while consuming only 10nA of current in shutdown mode
• Manufacturer: Maxim

The MAX9504A/MAX9504B 3V/5V, 6dB video amplifiers
with low-power shutdown mode accept DC-coupled
inputs and drive up to two DC-coupled, 150Ω back-ter-
minated video loads. The MAX9504B provides an inter-
nal input offset voltage of 160mV, which allows
DC-coupled input signals down to ground without clip-
ping the output sync tip.
The MAX9504A/MAX9504B operate from a single +2.7V
to +5.5V supply and consume only 5mA of supply cur-
rent. The low-power shutdown mode reduces supply cur-
rent to less than 1µA, making the MAX9504A/MAX9504B
ideal for low-voltage, battery-powered video applications.
As shown in the Typical Application Circuit, the
MAX9504A/MAX9504B can drive up to two 150Ω loads
to ground at the same time because the outputs can
source guaranteed 45mA (min) current. Two 150Ω loads
to ground is the same as a single 75Ω load to ground.
Since the MAX9504A/MAX9504B can also sink guaran-
teed 40mA (min) current, they can also drive two, AC-cou-
pled 150Ω loads. When V
2.4V
P-P
CURRENT
VIDEO
. When V
DAC
CC
R1
_______________________________________________________________________________________
> 4.5V, the output can swing 2.8V
Detailed Description
Output Current Capability
3-POLE RECONSTRUCTION LPF
C1
CC
> 3V, the output can swing
C3
L1
3V/5V, 6dB Video Amplifiers with
C2
High Output-Current Capability
R2
P-P
IN
.
160mV OFFSET
MAX9504B
ONLY
MAX9504A
MAX9504B
The MAX9504A/MAX9504B amplify DC-coupled video
signals with a gain of +2V/V (+6dB). The MAX9504B
features a 160mV input offset voltage (V
a video signal input range to ground without clipping
the output sync tip. The MAX9504B output voltage is
the sum of the input voltage and the input offset voltage
gained up by a factor of 2.
For example, if V
The MAX9504A/MAX9504B feature a low-power shut-
down mode (I
portable applications. Driving SHDN high enables the
output. Driving SHDN low disables the output and
places the MAX9504A/MAX9504B into a low-power
shutdown mode. In shutdown, the output resistance is
4kΩ (typ) due to the combination of feedback resistors
from OUT to ground with FB connected to OUT.
2.7V TO 5.5V
GND
V
CC
V
Typical Application Circuit
OUT
V
SHDN
0.1µF
IN
= 2 x (1V + 0.16V) = 2.32V
OUT
= 1V and V
= 2 x (V
< 1µA) for battery-powered/
SHDN
OUT
FB
Input Offset (MAX9504B)
V
CC
IN
OS
+ V
75Ω
75Ω
= 0.16V then:
Shutdown Mode
OS
Z
Z
)
0
0
= 75Ω
= 75Ω
OS
) that allows
75Ω
75Ω
7