参数资料
| 型号： | AD8432ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF DUAL LN LP 24LFCSP |
| 标准包装： | 5,000 |
| 放大器类型： | 电压反馈 |
| 电路数： | 2 |
| 输出类型： | 差分 |
| 转换速率： | 295 V/µs |
| -3db带宽： | 200MHz |
| 电压 - 输入偏移： | 1000µV |
| 电流 - 电源： | 24mA |
| 电流 - 输出 / 通道： | 77mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-WQ（4x4） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页当前第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
AD8432
Data Sheet
Rev. C | Page 18 of 32
THEORY OF OPERATION
LOW NOISE AMPLIFIER (LNA)
The AD8432 is a dual-channel, ultralow noise amplifier with
integrated pin-strappable, gain-setting resistors. The resistors
can be externally connected to achieve differential gains of
12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (×4, ×8, ×12, and
×16, respectively). A simplified schematic of an LNA is shown
The LNA is driven with a single-ended input and measured
differentially at the output. The inverting input INL must be
ac-coupled to ground through a capacitor for proper operation.
The LNA cannot be driven differentially due to the asymmetry
of the internal gain setting resistors. The gain from the inverting
input INL to the single-ended output (OPH or OPL) does not
match the gain from the noninverting input INH to the single-
ended output.
The AD8432 inputs have a dc bias voltage of 3.25 V, which is
generated internally. The inputs must be ac-coupled through a
series capacitor to maintain the dc bias level of the inputs. Likewise,
the AD8432 outputs have a dc bias voltage of 2.5 V. An ac coupling
capacitor in series with each single-ended output is recommended
to prevent improper loading of the outputs. The AD8432 inputs
have a dc bias voltage of 3.25 V, which is generated internally.
The inputs must be ac-coupled through a series capacitor to
maintain the dc bias level of the inputs (see CINL and CINH
The AD8432 supports a differential output voltage of 4.8 V p-p
for the common-mode output voltage of 2.5 V. Therefore, for a
differential gain of G = 12.04 dB, the maximum input voltage
allowed is 1.2 V p-p.
Clamping the inputs ensures quick recovery from large input
voltages. The input back-to-back diodes, which are integrated
inside the die (IND1 and IND2), should be used for the lowest gain
configuration (12.04 dB) to protect the input from overdriving.
They should be connected after the source resistance or before
the INH coupling capacitor.
The use of a fully differential topology and negative feedback
minimizes distortion. A differential signal enables smaller swings at
each output, which results in reduction of third-order distortion.
The AD8432 is a voltage feedback amplifier. Due to gain band-
width product (GBW), a decrease in bandwidth should be
expected as the gain increases. Table 5 displays the values of the
3 dB bandwidth for each gain with unterminated input
impedance.
GAIN SETTING TECHNIQUE
Pin strapping is used to set the gain of the amplifier. Gain setting
resistors are integrated in the LNA and are accessible externally
through the GOH, GMH, GML, and GOL pins. By externally
shorting these pins, and thereby shorting or connecting the
internal resistors, the AD8432 can be configured for four different
gains. Table 5 shows which pins must be connected to achieve
the desired gain.
RG2
12
RG3
24
RG4
48
RG7
48
RG6
24
RG5
24
RG1
12
I
CINH
INH
OPH
VPS
OPL
INL
RFB
CFB
Q2
Q1
GMH
GOH
GML
GOL
CINL
GND
RSH
RS
CSH
VS
08341-
065
Figure 65. Simplified Schematic of a Single LNA Channel, Including External Shunt and Feedback Components
相关PDF资料 |
PDF描述 |
|---|---|
| FI-RE21S-HF-R1500 | CONN RCPT 0.5MM 21POS SMD R/A |
| ADA4855-3YCPZ-RL | IC OPAMP VF R-R TRPL LP 16LFCSP |
| AA1-B0-21-630-3B1-C | CIRC BRKR MAGNETIC 30A |
| PPPC032LJBN-RC | CONN FEMALE 6POS DL .1" R/A GOLD |
| NPPN071BFLD-RC | CONN RECEPT 2MM SINGLE SMD 7POS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8432ACPZ-WP | 功能描述:IC AMP DUAL LN 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| AD8432ACPZ-WP | 制造商:Analog Devices 功能描述:Ultralow Noise Amplifier IC |
| AD8432-EVALZ | 功能描述:BOARD EVALUATION FOR AD8432 RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| AD8436 | 制造商:Analog Devices 功能描述:BOARD EVALUATION RMS-DC AD8436 制造商:Analog Devices 功能描述:AD8436, RMS TO DC CONV, EVAL BOARD |
| AD8436_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, Low Power, True RMS-to-DC Converter |
发布紧急采购，3分钟左右您将得到回复。