- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄5415 > ADA4891-4ARZ-RL (Analog Devices Inc)IC OPAMP GP R-R CMOS 14SOIC PDF資料下載
參數(shù)資料
| 型號： | ADA4891-4ARZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP R-R CMOS 14SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 210 V/µs |
| -3db帶寬： | 240MHz |
| 電流 - 輸入偏壓： | 2pA |
| 電壓 - 輸入偏移： | 2500µV |
| 電流 - 電源： | 4.4mA |
| 電流 - 輸出 / 通道： | 125mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Data Sheet
Rev. E | Page 16 of 24
Table 6. Recommended Component Values and Effect of Gain on ADA4891-3/ADA4891-4 Performance (RL = 1 k)
Feedback Network Values
3 dB Small-Signal Bandwidth (MHz)
Slew Rate (V/s)
Peaking (dB)
Gain
RF ()
RG ()
VOUT = 200 mV p-p
tR
tF
1
453
97
186
194
0.9
+1
0
Open
220
151
262
4.1
+2
453
97
181
223
0.9
+5
453
90.6
31
112
120
0
+10
453
45.3
13
68
67
0
EFFECT OF RF ON 0.1 dB GAIN FLATNESS
Gain flatness is an important specification in video applications.
It represents the maximum allowable deviation in the signal
amplitude within the pass band. Tests have revealed that the
human eye is unable to distinguish brightness variations of
less than 1%, which translates into a 0.1 dB signal drop within
the pass band or, put simply, 0.1 dB gain flatness.
The PCB layout configuration and bond pads of the chip often
contribute to stray capacitance. The stray capacitance at the
inverting input forms a pole with the feedback and gain resistors.
This additional pole adds phase shift and reduces phase margin
in the closed-loop phase response, causing instability in the
amplifier and peaking in the frequency response.
Figure 52 and Figure 53 show the effect of using various values
for Feedback Resistor RF on the 0.1 dB gain flatness of the parts.
Figure 52 shows the effect for the ADA4891-1/ADA4891-2.
Figure 53 show the effect for the ADA4891-3/ADA4891-4.
Note that a larger RF value causes more peaking because the
additional pole formed by RF and the input stray capacitance
shifts down in frequency and interacts significantly with the
internal poles of the amplifier.
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
1
0.1
10
100
FREQUENCY (MHz)
N
OR
M
A
LIZE
D
C
LOS
E
D
-LOO
P
G
AI
N
(
d
B)
VS = 5V
G = +2
VOUT = 2V p-p
RL = 150Ω
RG = RF = 604
RG = RF = 549
RG = RF = 649
RG = RF = 698
08054-
022
Figure 52. 0.1 dB Gain Flatness, Noninverting Gain Configuration,
ADA4891-1/ADA4891-2
–0.4
–0.5
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
1
0.1
10
100
FREQUENCY (MHz)
N
OR
M
A
LIZE
D
C
LOS
E
D
-LOO
P
G
AI
N
(
d
B)
08054-
085
VS = 5V
G = +2
VOUT = 2V p-p
RL = 150Ω
RG = RF = 453
RG = RF = 402
RG = RF = 357
RG = RF = 301
Figure 53. 0.1 dB Gain Flatness, Noninverting Gain Configuration,
ADA4891-3/ADA4891-4
To obtain the desired 0.1 dB bandwidth, adjust the feedback
be adjusted, a small capacitor can be placed in parallel with RF
to reduce peaking.
The feedback capacitor, CF, forms a zero with the feedback
resistor, which cancels out the pole formed by the input stray
capacitance and the gain and feedback resistors. For a first pass
in determining the CF value, use the following equation:
RG × CS = RF × CF
where:
RG is the gain resistor.
CS is the input stray capacitance.
RF is the feedback resistor.
CF is the feedback capacitor.
Using this equation, the original closed-loop frequency response of
the amplifier is restored, as if there is no stray input capacitance.
Most often, however, the value of CF is determined empirically.
Figure 54 shows the effect of using various values for the
feedback capacitor to reduce peaking. In this case, the
ADA4891-1/ ADA4891-2 are used for demonstration purposes
and RF = RG = 604 Ω. The input stray capacitance, together with
the board parasitics, is approximately 2 pF.
相關PDF資料 |
PDF描述 |
|---|---|
| AD8602DR-REEL7 | IC OPAMP GP CMOS 8.4MHZ 8SOIC |
| ADA4891-4ARUZ-RL | IC OPAMP GP R-R CMOS 14TSSOP |
| 3412.0115.26 | FUSE 1A 32V 0603 FAST |
| AD8638ARZ-REEL | IC OPAMP CHOPPER R-R 37MA 8SOIC |
| MP2-SS096-41P1-TR30 | CONN SOCKET 2-FB 96POS 4ROW |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4891-4WARUZ-R7 | 功能描述:高速運算放大器 Lw Cst CMOS Hgh Spd RR Amp Quad RoHS:否 制造商:NXP Semiconductors 通道數(shù)量: 電壓增益 dB: 輸入補償電壓: 轉換速度: 工作電源電壓: 電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SO-20 封裝:Tube 產(chǎn)品: |
| ADA4895-1ARJZ-R2 | 功能描述:IC OPAMP GP 236MHZ RRO SOT23-6 制造商:analog devices inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 壓擺率:943 V/μs -3db 帶寬:236MHz 電流 - 輸入偏置:11μA 電壓 - 輸入失調(diào):53μV 電流 - 電源:3mA 電壓 - 電源，單/雙（±）: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 供應商器件封裝:SOT-23-6 標準包裝:1 |
| ADA4895-1ARJZ-R7 | 功能描述:高速運算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 產(chǎn)品: |
| ADA4895-1ARJZ-RL | 功能描述:高速運算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 產(chǎn)品: |
| ADA4895-1ARZ | 功能描述:高速運算放大器 8-Lead SOIC Decomp L/N L/P Op Amp Single 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 產(chǎn)品: |
發(fā)布緊急采購，3分鐘左右您將得到回復。