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| 型號： | OPA2674 |
| 英文描述： | Dual Wideband, High Output Current Operational Amplifier with Current Limit |
| 中文描述： | 雙寬帶，高輸出電流運算放大器，具有電流限制 |
| 文件頁數(shù)： | 18/30頁 |
| 文件大?。?/td> | 472K |
| 代理商： | OPA2674 |
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SBOS270 AUGUST 2003
www.ti.com
18
OPA2674 HDSL2 UPSTREAM DRIVER
Figure 6 shows an HDSL2 implementation of a single-
supply driver.
82.5
2k
2k
1
μ
F
0.1
μ
F
0.1
μ
F
11.5
135
AFE
2V
PP
Max
Assumed
324
20
20
324
1/2
OPA2674
1/2
OPA2674
+12V
1:2.4
17.7V
PP
I
P
= 185mA
I
P
= 185mA
11.5
+6V
Z
Line
Figure 6. HDSL2 Upstream Driver
The two designs differ by the values of the matching
impedance, the load impedance, and the ratio turns of the
transformers. All of these differences are reflected in the
higher peak current and thus, the higher maximum power
dissipation in the output of the driver.
LINE DRIVER HEADROOM MODEL
The first step in a driver design is to compute the
peak-to-peak output voltage from the target specifications.
This is done using the following equations:
P
L
10
log
V
RMS
2
(1mW)
R
L
With P
L
power and V
RMS
voltage at the load, and R
L
load
impedance, this gives:
V
RMS
(1mW)
R
L
10
PL
10
V
P
CrestFactor
V
RMS
CF
V
RMS
with V
P
peak voltage at the load and CF Crest Factor;
V
LPP
2
CF
V
RMS
with V
LPP
: peak-to-peak voltage at the load.
Consolidating Equations 3 through 6 allows the required
peak-to-peak voltage at the load function of the crest
factor, the load impedance, and the power in the load to be
expressed. Thus:
V
LPP
2
CF
(1mW)
R
L
10
PL
10
This V
LPP
is usually computed for a nominal line
impedance and may be taken as a fixed design target.
The next step for the driver is to compute the individual
amplifier output voltage and currents as a function of V
PP
on the line and transformer turns ratio. As the turns ratio
changes, the minimum allowed supply voltage also
changes. The peak current in the amplifier is given by:
I
P
1
2
2
V
LPP
n
1
4R
M
With V
LPP
defined in Equation 7 and R
M
defined in
Equation 2. The peak current is computed in Figure 7 by
noting that the total load is 4R
M
and that the peak current
is half of the peak-to-peak calculated using V
LPP
.
R
M
R
M
V
LPP
V
LPP
R
L
±
I
P
±
I
P
2V
LPP
n
1:n
Figure 7. Driver Peak Output Model
With the required output voltage and current versus turns
ratio set, an output stage headroom model will allow the
required supply voltage versus turns ratio to be developed.
The headroom model (see Figure 8) can be described with
the following set of equations:
First, as available output voltage for each amplifier:
V
OPP
V
CC
(V
1
V
2
)
I
P
(R
1
R
2
)
Or, second, as required single-supply voltage:
V
CC
V
OPP
(V
1
V
2
)
I
P
(R
1
R
2
)
The minimum supply voltage for a power and load
requirement is given by Equation 10.
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
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PDF描述 |
|---|---|
| OPA2674ID | Dual Wideband, High Output Current Operational Amplifier with Current Limit |
| OPA2674IDR | Dual Wideband, High Output Current Operational Amplifier with Current Limit |
| OPA2677H | Dual, Wideband, High Output Current OPERATIONAL AMPLIFIER |
| OPA2677N | Dual, Wideband, High Output Current OPERATIONAL AMPLIFIER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2674I-14D | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2674I-14DG4 | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2674I-14DR | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2674I-14DRG4 | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA2674ID | 功能描述:高速運算放大器 Dual Wideband High Output Current RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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