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| 型號： | AD8390ACP-R2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF LP LDIST 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 300 V/µs |
| -3db帶寬： | 60MHz |
| 電流 - 輸入偏壓： | 4µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 10mA |
| 電流 - 輸出 / 通道： | 400mA |
| 電壓 - 電源，單路/雙路(±)： | 10 V ~ 24 V，±5 V ~ 12 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | AD8390ACP-R2DKR |
AD8390
Rev. C | Page 11 of 16
03600-
0
-036
P
W
DN1
P
W
DN0
RM
RL VOUT,DM
+
–
–OUT
+OUT
RM
R3
R2
R1
R3
0.1
F
I ADJ
RADJ
R2
1:N
10
F
0.1
F
VCC
+IN
VOCM
–IN
10
F
0.1
F
0.1
F
VEE
Figure 24. ADSL/ADSL2+ Application Circuit
Referring to Figure 24, the following describes how to calculate
the resistor values necessary to obtain the desired input imped-
ance, gain, and output impedance.
The differential input impedance to the circuit is simply 2R1.
As such, R1 is chosen by the designer to yield the desired input
impedance.
When synthesizing the output impedance, a factor k is
introduced, which is used to express the ratio of the negative
feedback resistor to the positive feedback resistor by
R2
R3
k =
1
(5)
Along with the turns ratio N, k is also used to define the value of
the back termination resistors RM. Commonly used values for k
are 0.1 to 0.25. A k value of 0.1 would result in back termination
resistors that are only 1/10 as large as those in the simplest case
described above. Lower values of k result in greater amounts of
positive feedback. Therefore, values much lower than 0.1 can
lead to instability and are generally not recommended.
2
2 N
R
k
R
L
M
×
=
(6)
This factor (k), along with R1, RM, and the desired gain (AV), is
then used to calculate the necessary values for R3 and R2.
(
)
M
V
R
k
R
k
R1
A
R1
A
k
R1
A
R3
×
+
×
+
×
=
2
(7)
The usually small value for RM allows a simplified approximation
for R3.
V
A
k
R1
R3
×
2
(8)
k
R3
R2
=
1
(9)
Once RM, R3, and R2 are computed, the closest 1% resistors can
be chosen and the gain rechecked with the following equation:
() R1
R3
R2
k
R
R3
R2
A
M
V
×
+
×
+
×
=
(10)
Table 6 shows a comparison of the results using the exact values,
the simplified approximation, and the closest 1% resistor values.
In this example, R1, AV, and k were chosen to be 1.0 k, 10 k,
and 0.1 k, respectively.
It should be noted that decreasing the value of the back termi-
nation resistors attenuates the receive signal by approximately
1/k. However, advances in low noise receive amplifiers permit
k values as small as 0.1 to be commonly used.
The line impedance, turns ratio, and k factor specify the output
voltage and current requirements from the AD8390. To accom-
modate higher crest factors or lower supply rails, the turns ratio,
N, may have to be increased. Since higher turns ratios and smaller
k factors both attenuate the receive signal, a large increase in N
may require an increase in k to maintain the desired noise
performance. Any particular design process requires that these
trade-offs be visited.
Table 6. Resistor Selection
Component
Exact
Values
Approximate
Calculation
Standard 1%
Resistor
Values
R1 ()
1000
R2 ()
2246.95
2222.22
2210
R3 ()
2022.25
2000
RM ()
5
4.99
Actual AV
10.000
9.889
10.138
Actual k (Eq. 5)
0.1
0.095
MULTITONE POWER RATIO (MTPR)
Multitone power ratio is a commonly used figure of merit that
xDSL designers use to help describe system performance.
MTPR is the measured delta between the peak of a filled
frequency bin and the harmonic products that appear in an
intentionally empty frequency bin. Figure 25 illustrates this
performance in various power modes. All data were taken with
a circuit with a k factor of 0.1, a 1:1 turns ratio transformer, and
a waveform with a 5.4 peak-to-average ratio, also known as the
crest factor (CF).
03600-0-033
–70dBc
10dB/DIV
CENTER 431.25kHz
SPAN 10kHz
1kHz/DIV
Figure 25. MTPR Measurement
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