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| 型号： | ADA4930-2YCPZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | IC DIFF AMP 1.35GHZ 24-LFCSP |
| 标准包装： | 1 |
| 放大器类型： | 差分 |
| 电路数： | 2 |
| 输出类型： | 差分 |
| 转换速率： | 3400 V/µs |
| -3db带宽： | 1.35GHz |
| 电流 - 输入偏压： | 23µA |
| 电压 - 输入偏移： | 150µV |
| 电流 - 电源： | 34mA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 3.3V，5V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 标准包装 |
| 其它名称： | ADA4930-2YCPZ-R2DKR |
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ADA4930-1/ADA4930-2
Rev. A | Page 22 of 28
Input Common-Mode Adjustment with Resistors
Calculate the following:
1.
β1 and β2. For the circuit shown in Figure 54, β1 = 0.5 and
β2 = 0.5.
The circuit shown in Figure 54 shows an alternate method to
bias the amplifier inputs, eliminating the dc source.
2.
RCM for VP min = 0.3 V and VIN min = 0.5 V. RCM = 9933 Ω.
ADA4930
RL VOUT, dm
+VS
–VS
3.3V
RS
50
RG1
301
RG2
301
RF2
301
RF1
301
RCM
VOCM
RCM
VS
VSOURCE
2V p-p
RT
09
20
9-
1
52
VIN
3.
The new values for β1 and β2. β1 = 0.4925 and β2 = 0.4925.
4.
The input impedance using the following:
+
=
=
β1β2
R
β2
β1
β2
β1
R
V
R
G1
F1
G1
INP
P
G1
SE
IN
1
RIN-SE = 399.35 Ω.
5.
RT, RTH, and VTH. RT = 57.16 Ω, RTH = 26.67 Ω, and
VTH = 1.067 V.
6.
The new values for RG1 and RG2. RG2 = 160.55 Ω and
RG1 = 133.88 Ω.
7.
The new values for β1 and β2. β1 = 0.284 and β2 = 0.317.
Figure 54. Single-Supply Biasing Scheme with Resistors
8.
The new value of RCM. RCM = 4759.63 Ω.
Define β1 = RP/RF1 and β2 = RN/RF2, where RP = RG1||RCM||RF1
and RN = RG2||RCM||RF2.
9.
Repeat Step 3 through Step 8 until the values of RG1 and RG2
remain constant between iterations. After four iterations,
the final circuit is shown in Figure 55.
Set RF1 = RF2 = RF to maintain a balanced system, as shown.
Write a nodal equation at VP and solve for VP.
ADA4930
RL VOUT, dm
+VS
–VS
RS
50
RG1
142
RG2
170
RF2
301
RF1
301
RCM
1.87k
RCM
1.87k
VOCM
+VS
VS
2V p-p
RT
65.1
09
20
9-
1
53
+
=
CM
F
S
OCM
IN
G
F
P
R
V
R
β2
β1
β1β2
V
2
1
Determine VP min. This is the minimum input common-mode
voltage from the Specifications section. For a 3.3 V supply,
VP min = 0.3 V.
Determine the minimum input voltage, VIN min at the output of
the source. Recognize that once properly terminated, the source
voltage is of its open circuit value. Therefore, VIN min = 0.5 V.
Rearrange the VP equation for RCM
+
=
OCM
min
IN
G
F
P
F
S
CM
V
R
V
β1β2
β2
β1
R
V
R
2
1
min
Figure 55. Single-Supply, Single-Ended Input System with Bias Resistors
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4930-2YCPZ-R7 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual 5.5V 24-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ULTRALOW NOISE DRIVER FOR LOW VOLT ADC - Tape and Reel 制造商:Analog Devices 功能描述:IC DIFF AMP 1.35GHZ 24-LFCSP 制造商:Analog Devices 功能描述:IC DIFF AMP 1.35GHz 3400V/ us LFCSP- 制造商:Analog Devices 功能描述:IC, DIFF AMP, 1.35GHz, 3400V/ us, LFCSP- 制造商:Analog Devices Inc. 功能描述:Differential Amplifiers UltraLow Noise Driver for Low Volt ADC 制造商:Analog Devices 功能描述:IC, DIFF AMP, 1.35GHz, 3400V/ us, LFCSP-24; No. of Amplifiers:2; Input Offset Voltage:500V; Bandwidth:1.35GHz; Amplifier Case Style:LFCSP; No. of Pins:24; Supply Voltage Range:3.3V to 5V; Slew Rate:3400V/s; Supply Current:34mA ;RoHS Compliant: Yes 制造商:Analog Devices 功能描述:Ultralow Noise Driver for ADCs LFCSP24 |
| ADA4930-2YCPZ-R7_PROMO | 制造商:Analog Devices 功能描述:IC DIFF AMP 1.35GHZ 3400V/U |
| ADA4930-2YCPZ-RL | 功能描述:差分放大器 UltraLow Noise Driver for Low Volt ADC RoHS:否 制造商:Analog Devices 通道数量:1 Channel 带宽:900 MHz 可用增益调整:5.6 dB to 20 dB 输入补偿电压:1 mV at 5 V 共模抑制比（最小值）:67 dB 工作电源电压:11 V 电源电流:28 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ADA4932-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power Differential ADC Driver |
| ADA4932-1_09 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power Differential ADC Driver |
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