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參數(shù)資料
| 型號(hào)： | AD8128ACPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER LINE EQUAL 8LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 類型： | 接收器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 0/1 |
| 規(guī)程： | 以太網(wǎng) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-VFDFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 8-LFCSP-VD（3x3） |
| 包裝： | 帶卷 (TR) |
AD8128
Rev. 0 | Page 10 of 12
APPLICATIONS
KVM APPLICATIONS
In KVM applications, cable equalization typically occurs at the
root of the KVM network. In a star configuration, a driver is
located at each of the end nodes and a receiver/equalizer is
located at the single root node. In a daisy-chain configuration,
each of the end nodes are connected to one another, and one of
them is connected to the root. Similarly, the drivers are placed
on the nodes, and the receivers/equalizers are placed at the root.
In both of these aforementioned configurations, three AD8128
receiver/equalizers can be used at the root node to equalize the
transmitted red (R), green (G), and blue (B) channels for up to
100 meters of cable. Since the skew between two pairs of cables
in CAT-5 is less than 1%, the control pins can be tied together
and used as a single set of controls.
If the common-mode levels of the inputs permit using the
AD8128 as a receiver (see the Input Common-Mode Voltage
Range Considerations section), the input signal should be
terminated by a 100 Ω shunt resistor between the pairs, or by
two 50 Ω shunt resistors with a common-mode tap in the
middle. This CM tap can be used to extract the sync information
from the signal if sync-on-common-mode is used.
VOFFSET
VGAIN
VPEAK
VOUT
VIN+
VIN–
AD8128
HPF
LPF
VCM
50
VCM
VDIFF
VCM
VDIFF
CAT-5
056
99-
01
6
Figure 18. Single Receiver Configuration for CAT-5 Equalizer
DC CONTROL PINS
The AD8128 uses two control pins (VGAIN and VPEAK) to adjust
the equalization based on the length of the cable and one pin
(VOFFSET) to adjust the dc output offset. VGAIN is a user-adjustable
0 V to 1 V broadband gain control pin, and VPEAK is a 0 V to 1 V
adjustable high frequency gain pin to equalize for the skin effect
in CAT-5 cable. The values of both VPEAK and VGAIN are linearly
correlated to the length of the cable to be equalized. A simple
formula can be used to approximate the desired values for both
of these pins.
425m/V
)
(m
length
V
GAIN =
(3)
110m/V
)
(m
length
V
PEAK =
(4)
While these equations give a close approximation of the desired
value for each pin, to achieve optimal performance, it may be
necessary to adjust these values slightly.
control pins on the AD8128. In Figure 19, a 1 kΩ potentiometer
is used to adjust the control pin voltage between the specified
range of 0 V to 1 V. In Figure 20, a 2 kΩ potentiometer is used
to control the offset pin from 2.5 V to +2.5 V. For both of these
configurations, a ±5V supply is assumed.
CONTROL PIN
VGAIN OR VPEAK
0.01F
+5V
4k
1k
0
56
99
-0
17
Figure 19. Circuit to Control VGAIN and VPEAK (0 V to 1 V)
OFFSET
0.01F
+5V
–5V
1k
2k
05
699
-01
8
Figure 20. Circuit to Control VOFFSET (±2.5 V)
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