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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 618K |
| 代理商： | AD8123ACPZ-R7 |
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AD8123
POWER SUPPLY FILTERING
External power supply filtering between the system power
supplies and the AD8123 is required in most applications to
prevent supply noise from contaminating the received signal as
well as to prevent unwanted feedback through the supplies that
could cause instability. Figure 29 shows that the AD8123 power
supply rejection decreases with increasing frequency. These
plots are for the lowest control settings and shift upward as the
peaking is increased.
Rev. 0 | Page 14 of 16
–60
–50
–40
–30
–20
–10
0
10
+PSRR
–PSRR
100k
1M
10M
100M
0
FREQUENCY (Hz)
P
V
GAIN
= 0V
V
PEAK
V
POLE
= 0V
Figure 29. AD8123 PSRR vs. Frequency
A suitable filter that uses a surface-mount ferrite bead is shown
in Figure 30, and its frequency response is shown in Figure 31.
Because the frequency response was taken using a 50 Ω network
analyzer and with only one 0.1 μF capacitor on the AD8123
side, the actual amount of rejection provided by the filter in a
real-world application will be different from that shown in
Figure 31. The general shape of the rejection curve, however,
will match Figure 31, providing substantially increased overall
PSRR from approximately 5 MHz to 500 MHz, where it is most
needed. One filter is required on each of the two supplies (not one
filter per supply pin).
FAIR-RITE
2743021447
*ALL AD8123 SUPPLY PINS ARE INDIVIDUALLY
DECOUPLED WITH A 0.1μF CAPACITOR.
0
0.1μF
4700pF
4700pF
SYSTEM
SUPPLY
TO AD8123*
Figure 30. Power Supply Filter
–120
–100
–80
–60
–40
–20
0
10k
100k
1M
10M
100M
0
FREQUENCY (Hz)
O
Figure 31. Power Supply Filter Frequency Response in a 50 Ω System
LAYOUT AND POWER SUPPLY DECOUPLING
CONSIDERATIONS
Standard high speed PCB layout practices should be adhered
to when designing with the AD8123. A solid ground plane is
required and controlled impedance traces should be used when
interconnecting the high speed signals. Source termination
resistors on all of the outputs must be placed as close as possible
to the output pins.
The exposed paddle on the underside of the AD8123 must be
connected to a pad that connects to at least one PCB plane.
Several thermal vias should be used to make the connection
between the pad and the plane(s).
High quality 0.1 μF power supply decoupling capacitors should
be placed as close as possible to all of the supply pins. Small
surface-mount ceramic capacitors should be used for these, and
tantalum capacitors are recommended for bulk supply decoupling.
INPUT COMMON-MODE RANGE
Most applications that use the AD8123 as a receiver use a driver
(such as one from the
AD8146/AD8147/AD8148
family, the
AD8133
, or the
AD8134
) powered from ±5 V supplies. This
places the common-mode voltage on the line nominally at 0 V
relative to the ground potential at the driver and provides
optimum immunity from any common-mode anomalies picked
up along the cable (including ground shifts between the driver
and receiver ends). In many of these applications, the AD8123
input voltage range of typically ±3.0 V is sufficient. If wider
input range is required, the
AD8143
triple receiver (input
common-mode range equals ±10.5 V on ±12 V supplies) may be
placed in front of the AD8123. Figure 32 illustrates how this is done
for one channel.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)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(yīng)商設(shè)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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