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参数资料
| 型号： | MAX9923TEUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 转换速率： | 0.4 V/µs |
| -3db带宽： | 50kHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 0.2µV |
| 电流 - 电源： | 780µA |
| 电压 - 电源，单路/双路(±)： | 2.85 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
MAX9922/MAX9923
Ultra-Precision, High-Side
Current-Sense Amplifiers
______________________________________________________________________________________
11
Shutdown
The MAX9922/MAX9923 feature a logic shutdown input
to reduce the supply current to less than 1A. Drive
SHDN high for normal operation. Drive SHDN low to
place the device in shutdown mode. In shutdown
mode, the current drawn from both the VDD input and
the current-sense amplifier inputs (RSB, RS+, and RS-)
is less than 1A each.
External Reference
The MAX9922/MAX9923 are capable of both unidirec-
tional and bidirectional operation. For unidirectional
current-sense applications, connect the REF input to
GND. For bidirectional, connect REF to a reference.
This sets bidirectional current sense with VOUT = VREF
for VSENSE = 0mV. Positive VSENSE causes OUT to
swing toward the positive supply, while negative
VSENSE causes OUT to swing toward GND. This feature
allows the output voltage to measure both charge and
discharge currents. Use VREF = VDD/2 for maximum
dynamic range.
In bidirectional operation, the external voltage applied
to VREF has to be able to supply the current in the feed-
back network between OUT, FB, and REF. This current
is simply the input sense voltage divided by the resis-
tance between FB and REF (1k
typical for MAX9923).
Furthermore, ensure the external voltage source sup-
plied to REF has a low source resistance to prevent
gain errors (e.g., use a stand-alone reference voltage
or an op amp to buffer a high-value resistor string.) See
the
Typical Operating Circuits.
Input Differential Signal Range
The MAX9922/MAX9923 feature a proprietary input
structure optimized for small differential signals as low
as 10mV full scale for high efficiency with lowest power
dissipation in the sense resistor, or +100mV full scale for
high dynamic range. The output of the MAX9922/
MAX9923 allows for bipolar input differential signals.
Gain accuracy is specified over the VSENSE range to
keep the output voltage 250mV away from the rails to
achieve full accuracy. Output of the part is rail-to-rail
and goes to within 25mV of the rails, but accuracy is not
maintained. Linear operation is not guaranteed for input
sense voltages greater than ±150mV.
Applications Information
Power Supply, Bypassing, and Layout
Good layout technique optimizes performance by
decreasing the amount of stray capacitance at the
high-side, current-sense amplifier gain-setting pins, FB
to REF and FB to GND. Capacitive decoupling between
VDD to GND of 0.1F is recommended. Since the
MAX9922/MAX9923 feature ultra-low input offset volt-
age, board leakage and thermocouple effects can easi-
ly introduce errors in the input offset voltage readings
when used with high-impedance signal sources.
Minimize board leakage current and thermocouple
effects by thoroughly cleaning the board and placing
the matching components very close to each other and
with appropriate orientation. For noisy digital environ-
ments, the use of a multilayer printed circuit board
(PCB) with separate ground and power-supply planes
is recommended. Keep digital signals far away from
the sensitive analog inputs. Unshielded long traces at
the input and feedback terminals of the amplifier can
degrade performance due to noise pick-up.
VOUT - VREF
AV = 100
5V
2.5V
-2.5V
-25mV
0
25mV
DISCHARGE
CURRENT
CHARGE
CURRENT
VOUT = RSENSE x
(1 +
R2) x I
SENSE + VREF
R1
Figure 1. Bidirectional Current-Sense Transfer Function
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9923TEUB+ | 功能描述:电流灵敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9923TEUB+T | 功能描述:电流灵敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9924UAUB/V+ | 功能描述:接口 - 专用 Variable-Reluctance Sensor Interface RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MAX9924UAUB/V+T | 功能描述:接口 - 专用 Variable-Reluctance Sensor Interface RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MAX9924UAUB+ | 功能描述:接口 - 专用 Variable-Reluctance Sensor Interface RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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