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參數(shù)資料
| 型號(hào)： | AD8005ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CF ULP LDIST 10MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1500 V/µs |
| -3db帶寬： | 270MHz |
| 電流 - 輸入偏壓： | 5µA |
| 電壓 - 輸入偏移： | 5000µV |
| 電流 - 電源： | 400µA |
| 電流 - 輸出 / 通道： | 10mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 773 (CN2011-ZH PDF) |
AD8005
Data Sheet
APPLICATIONS
DRIVING CAPACITIVE LOADS
Capacitive loads interact with the output impedance of an op
amp to create an extra delay in the feedback path. This reduces
circuit stability and can cause unwanted ringing and oscillation.
A given value of capacitance causes much less ringing when the
amplifier is used with a higher noise gain.
The capacitive load drive of the AD8005 can be increased by
adding a low valued resistor in series with the capacitive load.
Introducing a series resistor tends to isolate the capacitive load
from the feedback loop, thereby diminishing its influence.
Figure 31 shows the effects of a series resistor on capacitive drive
for varying voltage gains. As the closed-loop gain is increased,
the larger phase margin allows for larger capacitive loads with
less overshoot. Adding a series resistor at lower closed-loop
gains accomplishes the same effect. For large capacitive loads,
the frequency response of the amplifier is dominated by the
roll-off of the series resistor and capacitive load.
Figure 30. Driving Capacitive Loads
Figure 31. Capacitive Load Drive vs. Closed-Loop Gain
SINGLE-SUPPLY LEVEL SHIFTER
In addition to providing buffering, many systems require that an
op amp provide level shifting. A common example is the level
shifting required to move a bipolar signal into the unipolar range
of many modern analog-to-digital converters (ADCs). In general,
single supply ADCs have input ranges that are referenced neither
to ground nor supply. Instead the reference level is some point
in between, usually halfway between ground and supply (+2.5 V
for a single supply 5 V ADC). Because high-speed ADCs typically
have input voltage ranges of 1 V to 2 V, the op amp driving it
must be single supply but not necessarily rail-to-rail.
Figure 32. Bipolar to Unipolar Shift Lever
Figure 32 shows a level shifter circuit that can move a bipolar
signal into a unipolar range. A positive reference voltage, derived
from the +5 V supply, sets a bias level of +1.25 V at the nonin-
verting terminal of the op amp. In ac applications, the accuracy
of this voltage level is not important; however, noise is a serious
consideration. A 0.1 mF capacitor provides useful decoupling of
this noise.
The bias level on the noninverting terminal sets the input common-
mode voltage to +1.25 V. Because the output is always positive,
the op amp can be powered with a single +5 V power supply.
The overall gain function is given by the equation:
REF
IN
OUT
V
R
V
R
V
+
+
=
1
2
1
4
3
4
1
2
In the above example, the equation simplifies to
VOUT = VIN + 2.5 V
SINGLE-ENDED-TO-DIFFERENTIAL CONVERSION
Many single supply ADCs have differential inputs. In such
cases, the ideal common-mode operating point is usually
halfway between supply and ground. Figure 33 shows how to
convert a single-ended bipolar signal into a differential signal
with a common-mode level of 2.5 V.
Figure 33. Single-Ended-to-Differential Converter
RF
RG
RS
RL
1kΩ
CL
AD8005
12146-
030
1
2
4
5
3
C
A
P
A
C
ITIV
E
LOA
D
(
pF)
CLOSED-LOOP GAIN (V/V)
80
70
60
50
40
30
20
10
0
VS = ±5V
2V OUTPUT STEP
WITH 30% OVERSHOOT
RS = 10Ω
RS = 5Ω
RS = 0Ω
12146-
031
R2
1.5kΩ
R1
1.5kΩ
R3
30.1kΩ
R4
10kΩ
VREF
5V
VOUT
10F
0.01F
0.1F
5V
VIN
AD8005
12146-
032
0.1F
+5V
AD8005
BIPOLAR
SIGNAL
±0.5V
0.1F
+5V
AD8005
2.49kΩ
RF1
2.49kΩ
RIN
1kΩ
RF1
3.09kΩ
RG
619Ω
2.49kΩ
+5V
VOUT
12146-
033
Rev. B | Page 10 of 16
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| AD8005ARZ-REEL | 功能描述:IC OPAMP CF ULP LDIST 10MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| AD8005ARZ-REEL7 | 功能描述:IC OPAMP CF ULP LDIST 10MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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