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參數資料
| 型號： | AD8123ACPZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Triple Differential Receiver with Adjustable Line Equalization |
| 中文描述： | LINE RECEIVER, QCC40 |
| 封裝： | 6 X 6MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40 |
| 文件頁數： | 15/16頁 |
| 文件大小： | 618K |
| 代理商： | AD8123ACPZ-R7 |
AD8123
Rev. 0 | Page 15 of 16
0
100
49.9
1
2
3
RESIGNAL
+5V
ONINPUT
PONE AD8143 CHANNEL
–5V
HBAT-540C
SMALL SIGNAL FREQUENCY RESPONSE
Though the AD8123 large signal frequency response
(V
O
= 1 V p-p) is of most concern, occasionally designers are
interested in the small signal frequency response. The AD8123
frequency response for V
O
= 300 m V p-p is shown in Figure 33
for 200 meter and 300 meter cable lengths.
0
FREQUENCY (MHz)
G
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
0.1
1
10
100
0.01
V
O
= 300mV p-p
200 METERS
300 METERS
Figure 32. Optional Use of AD8143 in Front of AD8123 for
Wide Input Common-Mode Range
The Schottky diodes are required to protect the AD8123 from
any
AD8143
outputs that may exceed the AD8123 input limits.
The 49.9 Ω resistor limits the fault current and produces a pole
at approximately 800 MHz with the effective diode capacitance of
3 pF and the AD8123 input capacitance of 1 pF. The pole drops
the response by only 0.07 dB at 100 MHz and therefore has a
negligible effect on the signal.
When using a single 5 V supply on the driver side, the
common-mode voltage at the driver is typically midsupply, or
V
CM
= 2.5 V. The largest received differential video signal is
approximately 700 mV p-p, and this therefore adds 175 mV
PEAK
to the common-mode voltage, resulting in a worst-case peak
voltage of 2.675 V on an AD8123 input (presuming there is no
ground shift between driver and receiver). This is within the
AD8123 input voltage swing limits, and such a system works well
as long as the difference in ground potential between driver and
receiver does not cause the input voltage swing to exceed its
specified limits.
When used, common-mode sync signals are generally applied
with a peak deviation of 500 mV and thereby increase the
common-mode level from 2.675 V to 3.175 V. This common-
mode level exceeds the specified input voltage swing limits of
±3.0 V; therefore, the AD8123 cannot be used with a system
that uses common-mode sync encoding with 500 mV sync peak
deviation and 2.5 V common-mode line level. While it is possible
to operate a driver powered from a single 5 V supply at a common-
mode voltage of <2.5 V to obtain a received voltage swing that is
within the specified limits, there is not much margin for other
shifts in the common-mode level due to interference pickup
and differing ground potentials. There are two ways to increase
the common-mode range of the overall system. One is to power
the driver from ±5 V supplies, and the other is to place an
AD8143
in front of the AD8123, as shown in Figure 32. These
techniques may be combined or applied separately.
Figure 33. Small Signal Frequency Response for Various Cable Lengths
POWER-DOWN
The power-down feature is intended to be used to reduce power
consumption when a particular device is not in use and does
not place the output in a high-Z state when asserted. The input
logic levels and supply current in power down mode are presented
in the Power Supply section of Table 1.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8123ACPZ-R71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Triple Differential Receiver with Adjustable Line Equalization |
| AD8123ACPZ-RL | 功能描述:IC RCVR TRPL DIFF EQUAL 40LFCSP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:250 系列:- 類型:收發器 驅動器/接收器數:2/2 規程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD8123ACPZ-RL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Triple Differential Receiver with Adjustable Line Equalization |
| AD8123ACPZ-TR | 制造商:Analog Devices 功能描述:TRIPLE EQUALIZER - Tape and Reel |
| AD8124 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Triple Differential Receiver with 200 Meter Adjustable Cable Equalization |
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