AD8129ARMZ Analog Devices Inc, AD8129ARMZ Datasheet - Page 34

• Manufacturer Part Number: AD8129ARMZ
• Description: IC AMP DIFF LN LDIST 40MA 8MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD8129ARMZ

• Amplifier Type: Differential
• Number Of Circuits: 1
• Slew Rate: 1070 V/µs
• -3db Bandwidth: 200MHz
• Current - Input Bias: 500nA
• Voltage - Input Offset: 200µV
• Current - Supply: 13mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 25.2 V, ±2.25 V ~ 12.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• No. Of Amplifiers: 1
• Input Offset Voltage: 800µV
• Gain Db Max: 10dB
• Bandwidth: 200MHz
• Supply Voltage Range: ± 2.25V To ± 12.6V
• Supply Current: 43mA
• Amplifier Case Style: MSOP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -

AD8129/AD8130
The feedback network is between Pin 6 and Pin 5 and from
Pin 5 to ground. C1 and R
800 kHz. The gain increases to provide about 15 dB of boost
at 8 MHz. The response of this circuit is shown in Figure 136.
Figure 135. Transmission Response of 300 Meters of Category-5 Cable
Figure 134. An Equalizer Circuit for Composite Video Transmissions
–10
–20
–30
–40
–50
–60
–70
–80
–10
–20
–30
–40
–50
–60
–70
–80
20
10
20
10
0
0
10k
10k
200pF
100 Ω
Figure 136. Frequency Response of Equalizer Circuit
C1
R1
V
IN
over 300 Meters of Category-5 Cable
100 Ω
AD8130
100k
100k
R
499 Ω
G
4
5
1
8
F
+
+
1k Ω
FREQUENCY (Hz)
FREQUENCY (Hz)
create a corner frequency of about
R
F
PD
3
1M
1M
–V
–V
2
S
+V
+V
7
S
6
0.1 μ F
0.1 μ F
10M
10M
10 μ F
V
OUT
10 μ F
100M
100M
Rev. C | Page 34 of 40
It is difficult to calculate the exact component values via strictly
mathematical means, because the equations for the cable
attenuation are approximate and have functions that are not
simply related to the responses of RC networks. The method
used in this design was to approximate the required response
via graphical means from the frequency response and then
select components that would approximate this response. The
circuit was then built, measured, and finally adjusted to obtain
an acceptable response—in this case, flat to 9 MHz to within
approximately 1 dB (see Figure 137).
OUTPUT OFFSET/LEVEL TRANSLATOR
The circuit in Figure 133 has the reference input (Pin 4) tied to
ground, which produces a ground-referenced output signal. If it
is desired to offset the output voltage from ground, the REF
input can be used (see Figure 138). The level V
the output with unity gain.
If the circuit has a gain higher than unity, the gain must be
factored in. If R
REF is multiplied by the gain of the circuit and appears at the
output—just like a noninverting conventional op amp. This
situation is not always desirable; the user may want V
appear at the output with unity gain.
Figure 138. The Voltage Applied to Pin 4 to the Unity-Gain Output Voltage
–10
–20
–30
–40
–50
–60
–70
–80
V
20
10
OFFSET
0
10k
Figure 137. Combined Response of Cable Plus Equalizer
V
IN
AD8130
G
is connected to ground, the voltage applied to
1
8
4
5
100k
+
+
Produced by V
PD
FREQUENCY (Hz)
3
–V
–V
2
S
+V
+V
7
1M
S
6
0.1 μ F
IN
0.1μF
V
OUT
10μF
= V
10M
10μF
IN
OFFSET
+V
OFFSET
appears at
OFFSET
100M
to