參數(shù)資料
型號(hào)： ADA4897-1ARJZ-R7
廠商： Analog Devices Inc
文件頁數(shù)： 10/29頁
文件大?。?/td> 0K
描述： IC OPAMP GP RR 230MHZ LN SOT23-6
標(biāo)準(zhǔn)包裝： 3,000
放大器類型： 電壓反饋
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 120 V/µs
-3db帶寬： 230MHz
電流 - 輸入偏壓： 11µA
電壓 - 輸入偏移： 28µV
電流 - 電源： 3mA
電流 - 輸出 / 通道： 80mA
電壓 - 電源，單路/雙路(±)： 3 V ~ 10 V，±1.5 V ~ 5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： SOT-23-6
供應(yīng)商設(shè)備封裝： SOT-23-6
包裝： 帶卷 (TR)
Data Sheet
ADA4896-2/ADA4897-1/ADA4897-2
Rev.
| Page 17 of 28
THEORY OF OPERATION
AMPLIFIER DESCRIPTION
The ADA4896-2/ADA4897-1/ADA4897-2 are 1 nV/√Hz input
noise amplifiers that consume 3 mA from supplies ranging from
3 V to 10 V. Fabricated on the Analog Devices SiGe bipolar process,
the ADA4896-2/ADA4897-1/ADA4897-2 have a bandwidth in
excess of 200 MHz. The amplifiers are unity-gain stable, and the
input structure results in an extremely low input 1/f noise for a
high speed amplifier.
The rail-to-rail output stage is designed to drive the heavy feed-
back load required to achieve an overall low output referred noise.
To meet more demanding system requirements, the large signal
bandwidth of the ADA4896-2/ADA4897-1/ADA4897-2 was
increased beyond the typical fundamental limits of other low noise,
unity-gain stable amplifiers. The maximum offset voltage of 500 μV
and drift of 0.2 μV/°C make the ADA4896-2/ADA4897-1/
ADA4897-2 excellent amplifier choices even when the low noise
performance is not needed because there is minimal power
penalty in achieving the low input noise or the high bandwidth.
INPUT PROTECTION
The ADA4896-2/ADA4897-1/ADA4897-2 are fully protected
from ESD events, withstanding human body model ESD events
of 2.5 kV and charged-device model events of 1 kV with no mea-
sured performance degradation. The precision input is protected
with an ESD network between the power supplies and diode
clamps across the input device pair, as shown in Figure 44.
+IN
ESD
–VS
+VS
BIAS
TO THE REST OF THE AMPLIFIER
–IN
ESD
09
44
7-
06
8
Figure 44. Input Stage and Protection Diodes
For differential voltages above approximately 0.7 V, the diode
clamps begin to conduct. Too much current can cause damage
due to excessive heating. If large differential voltages must be
sustained across the input terminals, it is recommended that the
current through the input clamps be limited to less than 10 mA.
Series input resistors that are sized appropriately for the expected
differential overvoltage provide the needed protection.
The ESD clamps begin to conduct for input voltages that are
more than 0.7 V above the positive supply and input voltages
more than 0.7 V below the negative supply. If an overvoltage
condition is expected, it is recommended that the input current
be limited to less than 10 mA.
DISABLE OPERATION
Figure 45 shows the ADA4897-1/ADA4897-2 power-down
circuitry. If the DISABLE pin is left unconnected, the base of
the input PNP transistor is pulled high through the internal
pull-up resistor to the positive supply and the part is turned
on. Pulling the DISABLE pin to ≥2 V below the positive supply
turns the part off, reducing the supply current to approximately
18 μA for a 5 V voltage supply.
+VS
–VS
DISABLE
ESD
IBIAS
TO
AMPLIFIER
BIAS
09
44
7-
03
7
Figure 45. DISABLE Circuit
The DISABLE pin is protected by ESD clamps, as shown in
Figure 45. Voltages beyond the power supplies cause these
diodes to conduct. For protection of the DISABLE pin, the
voltage to this pin should not exceed 0.7 V above the positive
supply or 0.7 V below the negative supply. If an overvoltage
condition is expected, it is recommended that the input current
be limited with a series resistor to less than 10 mA.
When the amplifier is disabled, its output goes to a high
impedance state. The output impedance decreases as frequency
increases; this effect can be observed in Figure 36. In disable
mode, a forward isolation of 50 dB can be achieved at 10 MHz.
Figure 43 shows the forward isolation vs. frequency data.
B
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ADA4897-1ARJZ-RL 功能描述:IC OPAMP GP RR 230MHZ LN SOT23-6 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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