参数资料
| 型号： | MAX9949DCCB+D |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC PPMU DUAL SPI 64TQFP |
| 标准包装： | 160 |
| 系列： | * |
MAX9949/MAX9950
Dual Per-Pin Parametric Measurement Units
18
______________________________________________________________________________________
Applications Information
In force-voltage (FV) mode, the output FORCE_ voltage
is directly proportional to the input control voltage. In
force-current (FI) mode, the current flowing out of the
FORCE_ output is proportional to the input control volt-
age. Positive current flows out of the PMU.
In force-nothing (FN) mode, the FORCE_ output is high
impedance.
In measure-current (MI) mode, the voltage at the MSR_
output is directly proportional to the current exiting the
FORCE_ output. Positive current flows out of the PMU.
In measure-voltage (MV) mode, the voltage at the
MSR_ output is directly proportional to the voltage at
the SENSE_ input.
Current-Sense-Amplifier Offset
Voltage Input
IOS is a buffered input to the current-sense amplifier.
The current-sense amplifier converts the input control
voltage (IN0_ or IN1_) to the forced DUT current (FI)
AND converts the sensed DUT current to the MSR_ out-
put voltage (MI). When IOS equals zero relative to DUT-
GND (the GND voltage at the DUT, which the
level-setting DACs and the ADC are presumed to use
as a ground reference), the nominal voltage range that
corresponds to ± full-scale current is -4V to +4V. Any
voltage applied to the IOS input adds directly to this
control input/measure output voltage range, i.e., apply-
ing +4V to IOS forces the voltage range that corre-
sponds to ± full-scale current from 0 to +8V.
The following equations determine the minimum and
maximum currents for each current range correspond-
ing to the input voltage or measure voltage:
VMAXCURRENT = VIOS + 4V
VMINCURRENT = VIOS - 4V
Choose IOS so the limits of the MSR_ output do not go
closer than 2.8V to either VEE or VCC. For example, with
supplies of +10V and -5V, limit the MSR_ output to -2.2V
and +7.2V. Therefore, set IOS between +1.8V and +3.2V.
The MSR_ output could clip if IOS is not within this range.
Use these general equations for the limits on IOS:
Minimum VIOS = VEE + 6.8V
Maximum VIOS = VCC - 6.8V
Current Booster for Highest Current Range
An external buffer amplifier can be used to provide a
current range greater than the MAX9949/MAX9950
maximum output current (Figure 5). This function oper-
ates as follows.
A digital output decoded from the range select bits,
EXTSEL_, indicates when to activate the booster. The
R_COM output serves as an input to an external buffer
through a 50
current-limit series resistor. Each side of
the external current-sense resistor feeds back to RXA_
and RXD_. Ensure that the buffer circuit enters a high-Z
output state when not selected. Any leakage in the
buffer adds to the leakage of the PMU.
Voltage Clamps
The voltage clamps limit the FORCE_ output and oper-
ate over the entire specified current range. Set the
clamp voltages externally at CLHI_ and CLLO_. The
voltage at the FORCE_ output triggers the clamps inde-
pendent of the voltage at the SENSE_ input. When
enabled, the clamps function in both FI and FV modes.
Current Limit
The current-limiting circuitry on the FORCE_ output
ensures a well-behaved MSR_ output for currents
between the full current range and the current limits, i.e.,
for currents greater than the full-scale current, the MSR_
voltage is greater than +4V and for currents less than the
full-scale current, the MSR_ voltage is less than -4V.
Independent Control of the Feedback
Switch and the Measure Switch
Two single-pole-double-throw (SPDT) switches deter-
mine the mode of operation of the PMU. One switch
determines whether the sensed DUT current or DUT
voltage feeds back to the input (sensing), and thus
FORCE_
REXTBOOST
R_COM
50
RXA_
RXD_
INTERNAL TO MAX9949/MAX9950
AV = +2
EXTSEL_
Figure 5. External Current Boost
相关PDF资料 |
PDF描述 |
|---|---|
| DS1402D-DR8+ | CABLE 8' BLUE DOT TO RJ11 |
| DS1402D-DB8+ | CABLE 8' BLUE DOT TO BUTTON |
| USB-DAQ-SS | IC SYSTEM DATA LOGGER 20-SSOP |
| NCP698SQ13T1G | IC REG LDO 1.3V .28A SC-82AB |
| HMC30DRAH-S734 | CONN EDGECARD 60POS .100 R/A PCB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9949DCCB-TD | 功能描述:接口 - 专用 Dual Per-Pin Parametric Measurement Unit 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 |
| MAX9949FCCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9949FCCB+ | 制造商:Maxim Integrated Products 功能描述:DUAL PER PIN PARAMETRIC MEASUREMENT UNIT 64TQFP - Rail/Tube |
| MAX9949FCCB+D | 功能描述:接口 - 专用 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 |
| MAX9949FCCB+T | 制造商:Maxim Integrated Products 功能描述:PARAMETRIC MEASUREMENT UNIT 64TQFP - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。