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參數資料
| 型號： | AD8132ARZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Cost, High Speed Differential Amplifier |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件頁數： | 23/32頁 |
| 文件大小： | 456K |
| 代理商： | AD8132ARZ-R7 |
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AD8132
When using the AD8132 in gain configurations where β1 ≠ β2,
differential output noise appears due to input-referred voltage
noise in the V
OCM
circuitry according to the following formula:
Rev. F | Page 23 of 32
+
=
β2
β1
β2
β1
V
V
NOCM
OND
2
where
V
OND
is the output differential noise and
V
NOCM
is the
input-referred voltage noise on V
OCM
.
CALCULATING INPUT IMPEDANCE OF THE
APPLICATION CIRCUIT
The effective input impedance of a circuit, such as that in Figure 64,
at +D
IN
and D
IN
, depends on whether the amplifier is being driven
by a single-ended or differential signal source. For balanced differ-
ential input signals, the input impedance (R
IN, dm
) between the
inputs (+D
IN
and D
IN
) is simply
R
R
×
=
2
G
dm
IN,
In the case of a single-ended input signal (for example, if D
IN
is grounded and the input signal is applied to +D
IN
), the input
impedance becomes
(
)
+
×
=
F
G
F
G
R
dm
IN,
R
R
R
R
2
1
The circuit input impedance is effectively higher than it would
be for a conventional op amp connected as an inverter because
a fraction of the differential output voltage appears at the inputs
as a common-mode signal, partially bootstrapping the voltage
across the Input Resistor R
G
.
INPUT COMMON-MODE VOLTAGE RANGE IN
SINGLE-SUPPLY APPLICATIONS
The AD8132 is optimized for level-shifting ground-referenced
input signals. For a single-ended input, this implies that the voltage
at D
IN
in Figure 64 is 0 V when the amplifier’s negative power
supply voltage (at V) was also set to 0 V.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
The AD8132s V
OCM
pin is internally biased at a voltage approx-
imately equal to the midsupply point (average value of the voltage
on V+ and V). Relying on this internal bias results in an output
common-mode voltage that is within approximately 100 mV
of the expected value.
In cases where more accurate control of the output common-mode
level is required, it is best practice that an external source or resistor
divider (with R
SOURCE
< 10 kΩ) be used. The output common-mode
offset values in the Specifications section assume the V
OCM
input
is driven by a low impedance voltage source.
DRIVING A CAPACITIVE LOAD
A purely capacitive load can react with the pin and bond wire
inductance of the AD8132, resulting in high frequency ringing
in the pulse response. One way to minimize this effect is to place a
small capacitor across each of the feedback resistors. The added
capacitance must be small to avoid destabilizing the amplifier. An
alternative technique is to place a small resistor in series with
the amplifier outputs, as shown in Figure 60.
OPEN-LOOP GAIN AND PHASE
Open-loop gain and phase plots are shown in Figure 65 and
Figure 66.
–20
–10
0
10
20
30
40
50
60
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 65. Open-Loop Gain Plot
O
R
L, dm
= 2k
0
–200
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
20
40
0.1
1
10
100
1000
FREQUENCY (MHz)
O
R
L, dm
= 2k
0
Figure 66. Open-Loop Phase Plot
相關PDF資料 |
PDF描述 |
|---|---|
| AD8132 | Low-Cost, High-Speed Differential Amplifier |
| AD8132-EVAL | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR-REEL | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR-REEL7 | Low-Cost, High-Speed Differential Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8132ARZ-R71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132ARZ-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132ARZ-RL | 功能描述:IC AMP DIFF LDIST LP 70MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| AD8132ARZ-RL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost, High-Speed Differential Amplifier |
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