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參數(shù)資料
| 型號(hào)： | MAX9934TAUA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 3/19頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CURR SENSE LV 8UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流檢測(cè) |
| 電路數(shù)： | 1 |
| -3db帶寬： | 1.5kHz |
| 電流 - 輸入偏壓： | 35µA |
| 電壓 - 輸入偏移： | 10µV |
| 電流 - 電源： | 120µA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
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MAX9934
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
11
Maxim Integrated
voltage. Further, when VCC = 0, the amplifier maintains
an extremely high impedance on both its inputs and
output, up to the maximum operating voltages (see the
Absolute Maximum Ratings section).
The MAX9934 features a CS that can be used to dese-
lect its output current-source. This allows multiple cur-
rent-sense amplifier outputs to be multiplexed into a
single ADC channel with a single ROUT. See the Chip
Select Functionality for Multiplexed Systems section for
more details.
The
Functional Diagram shows the internal operation of
the MAX9934. At its core is the indirect current-feed-
back architecture. This architecture uses two matched
transconductance amplifiers to convert their input dif-
ferential voltages into an output current. A high-gain
feedback amplifier forces the voltage drop across
RGAIN to be the same as the input differential voltage.
The internal resistor (RGAIN) sets the transconductance
gain of the device. Both input and output transconduc-
tance amplifiers feature excellent common-mode rejec-
tion characteristics, helping the MAX9934 to deliver
industry-leading precision specifications over the full
common-mode range.
Applications Information
Advantages of Current-Output
Architecture
The transconductance transfer function of the MAX9934
converts input differential voltage to an output current.
An output termination resistor, ROUT, then converts this
current to a voltage. In a large circuit board with multi-
ple ground planes and multiple current-measurement
rails spread across the board, traditional voltage-output
current-sense amplifiers become susceptible to
ground-bounce errors. These errors occur because the
local ground at the location of the current-sense amplifi-
er is at a slightly different voltage than the local ground
voltage at the ADC that is sampling the voltage. The
MAX9934 allows accurate measurements to be made
even in the presence of system ground noise. This is
achieved by sending the output information as a cur-
rent, and by terminating to the ADC ground.
A further advantage of current-output systems is the
flexibility in setting final voltage gain of the device.
Since the final voltage gain is user-controlled by the
choice of output termination resistor, it is easy to opti-
mize the monitored load current range to the ADC input
voltage range. It is no longer necessary to increase the
size of the sense resistor (also increasing power dissi-
pation) as necessary with fixed-gain, voltage-output
current-sense amplifiers.
100mV
tHZ
% FINAL VALUE
tZH
VOUT
0V
1.8V
VCS
Figure 2. Output Select and Deselect Time
100mV
tPD
% FINAL VALUE
tPU
VCC
VOUT
0V
3.3V
2.5V
Figure 3. Output Power-Up and Power-Down Time
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| MAX9937AXK+T | 功能描述:電流靈敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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