參數(shù)資料
型號: MAX9934TALT+T
廠商: Maxim Integrated Products
文件頁數(shù): 6/19頁
文件大小: 0K
描述: IC AMP CURR SENSE LV 6UDFN
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 電流檢測
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: 6-WFBGA,CSPBGA
供應(yīng)商設(shè)備封裝: 6-uCSP(1.57x1.16)
包裝: 帶卷 (TR)
MAX9934
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
14
Maxim Integrated
A MAX9934 can be deselected by either forcing VCS
low as shown in Figures 4 and 5, or by making VCC =
0V as shown in Figure 6. In all these conditions, the
MAX9934 maintains a high-impedance output with
0.1nA (typ) leakage current. In this state, OUT can rise
above VCC if necessary. Thus, different supply voltages
can be used to power different MAX9934 devices that
are multiplexed on the same OUT bus. Multiplexing by
forcing the MAX9934 to be powered down (VCC = 0V)
reduces its supply current to zero to help extend bat-
tery life in portable applications.
Choosing RSENSE and ROUT
In the current-sense application, the monitored load
current (ILOAD) develops a sense voltage (VSENSE)
across a current-sense resistor (RSENSE). The
MAX9934 sources or sinks an output current that is pro-
portional to VSENSE. Finally, the MAX9934 output cur-
rent is provided to an output resistor (ROUT) to develop
an output voltage across ROUT that is proportional to
the sensed load current.
VCC = 3.3V
RSENSE
-0.1V
≤ VCM ≤ 5.5V
MAX9934
ROUT
10k
(OPTIONAL)
ADC
CS2
CS1
MICROCONTROLLER
CS
CS3
VCC = 3.3V
RSENSE
-0.1V
≤ VCM ≤ 5.5V
MAX9934
CS
VCC = 3.3V
RSENSE
-0.1V
≤ VCM ≤ 5.5V
MAX9934
CS
1/4 MAX4737
VIN1
VIN2
VIN3
ILOAD1
OUT3
OUT2
OUT1
0.1
F
0.1
F
0.1
F
ILOAD3
ILOAD2
Figure 6. Multiplexed Amplifiers with Power Saving
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