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參數(shù)資料
| 型號(hào)： | AD8145YCPZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Speed, Triple Differential Receiver with Comparators |
| 中文描述： | COMPARATOR, 6 ns RESPONSE TIME, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, MO-220VHHD-2, LFCSP-32 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD8145YCPZ-RL |
AD8145
To achieve unity gain from V
REF
to V
OUT
in this configuration,
divide V
REF
by the same factor used in the feedback loop; the
divider resistors, R
D
, need not be the same values used in the
internal feedback loop. Figure 35 illustrates this approach.
Rev. 0 | Page 16 of 24
GAIN
REF
R
R
0.01μF
0.01μF
+5V
–5V
C
V
REF
V
OUT
V
IN
R
D
R
D
0
Figure 35. Basic Gain Circuit: V
OUT
= 2V
IN
+ V
REF
The gain equation for the circuit in Figure 35 is
V
OUT
= 2
V
IN
+
V
REF
Another configuration that provides the same gain equation as
Equation 3 is shown in Figure 36. In this configuration, it is
important to keep the source resistance of V
REF
much smaller
than 350 Ω to avoid gain errors.
(3)
GAIN
REF
R
R
0.01μF
0.01μF
+5V
–5V
C
V
REF
V
OUT
V
IN
0
Figure 36. Basic Gain Circuit: V
OUT
= 2V
IN
+ V
REF
For stability reasons, the inductance of the trace connected to
the REF pin must be kept to less than 10 nH. The typical
inductance of 50 Ω traces on the outer layers of the FR-4 boards
is 7 nH/in, and on the inner layers, it is typically 9 nH/in. Vias
must be accounted for as well. The inductance of a typical via in
a 0.062 inch board is on the order of 1.5 nH. If longer traces are
required, a 200 Ω resistor should be placed in series with the
trace to reduce the Q-factor of the inductance.
In many dual-supply applications, V
REF
can be directly
connected to ground right at the device.
TERMINATING THE INPUT
One of the key benefits of the active feedback architecture is the
separation that exists between the differential input signal and
the feedback network. Because of this separation, the differential
input maintains its high CMRR and provides high differential
and common-mode input impedances, making line termination
a simple task.
Most applications that use the AD8145 involve transmitting
broadband video signals over 100 Ω UTP cable and use
dc-coupled terminations. The two most common types of
dc-coupled terminations are differential and common-mode.
Differential termination of 100 Ω UTP is implemented by
simply connecting a 100 Ω resistor across the amplifier input,
as shown in Figure 37.
GAIN
REF
R
R
0.01μF
0.01μF
+5V
–5V
C
OUT
V
OUT
V
IN
100
UTP
100
0
Figure 37. Differential-Mode Termination with G = 1
Some applications require common-mode terminations for
common-mode currents generated at the transmitter. In these
cases, the 100 Ω termination resistor is split into two 50 Ω
resistors. The required common-mode termination voltage is
applied at the tap between the two resistors. In many of these
applications, the common-mode tap is connected to ground
(V
TERM
(CM) = 0). This scheme is illustrated in Figure 38.
GAIN
REF
R
R
0.01μF
0.01μF
+5V
–5V
C
OUT
V
OUT
V
IN
100
UTP
50
50
V
TERM
(CM)
0
Figure 38. Common-Mode Termination with G = 1
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