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| 型号： | ADA4930-2YCPZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/29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 19 of 28
MINIMUM RG VALUE
Due to the wide bandwidth of the ADA4930-1/ADA4930-2, the
value of RG must be greater than or equal to 301 Ω at unity gain
to provide sufficient damping in the amplifier front end. In the
terminated case, RG includes the Thevenin resistance of the
source and load terminations.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
The VOCM pin of the ADA4930-1/ADA4930-2 is biased at 3/10 of
the total supply voltage above VS with an internal voltage divider.
The input impedance of the VOCM pin is 8.4 kΩ. When relying
on the internal bias, the output common-mode voltage is within
about 100 mV of the expected value.
In cases where accurate control of the output common-mode
level is required, it is recommended that an external source or
resistor divider be used with source resistance less than 100 Ω.
The output common-mode offset listed in the Specifications
section assumes that the VOCM input is driven by a low impedance
voltage source.
It is also possible to connect the VOCM input to a common-mode
voltage (VCM) output of an ADC. However, care must be taken
to ensure that the output has sufficient drive capability. The
input impedance of the VOCM pin is approximately 10 kΩ. If
multiple ADA4930-1/ADA4930-2 devices share one reference
output, it is recommended that a buffer be used.
CALCULATING THE INPUT IMPEDANCE FOR AN
APPLICATION CIRCUIT
The effective input impedance depends on whether the signal
source is single-ended or differential. For a balanced differential
between the inputs (+DIN and DIN) is RIN, dm = 2 × RG.
+VS
ADA4930
+IN
–IN
RF
+DIN
–DIN
VOCM
RG
VOUT, dm
09
20
9-
0
51
Figure 44. ADA4930-1/ADA4930-2 Configured for Balanced (Differential) Inputs
For an unbalanced single-ended input signal, as shown in
Figure 45, the input impedance is
RIN,SE = RG1
)
1
(
+
β2
β1
β2
β1
where:
β1 =
F1
G1
R
+
β2 =
2
F
G2
G
R
+
ADA4930
RL VOUT, dm
+VS
–VS
RG1
RG2
RF2
RF1
VOCM
RIN, SE
0
92
09
-05
2
Figure 45. ADA4930-1/ADA4930-2 with Unbalanced (Single-Ended) Input
For a balanced system where RG1 = RG2 = RG and RF1 = RF2 = RF,
the equations simplify to
+
=
+
=
)
2(
1
F
G
F
G
IN,SE
F
G
R
and
R
β2
β1
The input impedance of the circuit 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 RG1. The common-mode
voltage at the amplifier input terminals can be easily determined
by noting that the voltage at the inverting input is equal to the
noninverting output voltage divided down by the voltage divider
formed by RF2 and RG2. This voltage is present at both input
terminals due to negative voltage feedback and is in phase
with the input signal, thus reducing the effective voltage across
RG1, partially bootstrapping it.
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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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