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Automatic RF MESFET Amplifier
Drain-Current Controllers
REFADC
DAC
ADCIN1,
ACQ
AGND
ADCIN2
CIN+
COMPARATOR
HOLD
CIN-
ACQ
AGND
Figure 8. ADC Equivalent Input Circuit
AV DD / 2
HOLD
ACQ
HOLD
filter that limits the analog-input bandwidth.
Analog Input Protection
Internal ESD protection diodes clamp ADCIN1/ADCIN2
to AV DD and AGND, allowing them to swing from
(AGND - 0.3V) to (AV DD + 0.3V) without damage.
However, for accurate conversions near full scale, the
inputs must not exceed AV DD by more than 50mV or be
lower than AGND by 50mV. If an analog input voltage
exceeds the supplies, limit the input current to 2mA.
Temperature Measurements
The MAX11014/MAX11015 measure their internal die
temperature and two external remote-diode tempera-
tures. Write to the ADC conversion register to com-
mand a temperature conversion. See Table 19. Set the
CH6 bit to 1 to calculate the remote-diode DXP2/DXN2
temperature sensor reading and load the data into the
FIFO. Set the CH1 bit to 1 to calculate the remote-diode
DXP1/DXN1 temperature-sensor reading and load the
data into the FIFO. Set the CH0 bit to 1 to calculate the
internal die temperature-sensor reading and load the
data into the FIFO. Temperature data is output in
signed two’s-complement format at DOUT in SPI mode
and SDA in I 2 C mode. See Figure 22 for the tempera-
ture transfer function.
The MAX11014/MAX11015 perform internal tempera-
ture measurements with a diode-connected transistor.
The diode bias current changes from 66μA to 4μA to
produce a temperature-dependent bias voltage differ-
ence. The second conversion result at 4μA is subtract-
ed from the first at 66μA to calculate a digital value that
is proportional to absolute temperature. The stored
data result is the above digital code minus an offset to
adjust from Kelvin to Celsius. The reference voltage for
the temperature measurements is derived from the
internal reference source to ensure the temperature
calibration of 1 LSB corresponding to +0.125°C.
For external temperature readings, connect an npn
transistor between DXP_ and DXN_. Connect the base
and collector together as shown in Figure 4 to form a
base-emitter pn junction. The MAX11014/MAX11015
feature an ALARM output that trips when the internal or
external temperature rises above an upper threshold
value or drops below a lower threshold value. Set the
high and low temperature thresholds through the chan-
nel 1/channel 2 high/low temperature ALARM threshold
registers. See Tables 3, 4, and 5.
The temperature-sensing circuits power up for the first
temperature measurement in an ADC conversion scan.
The temperature-sensing block remains on until the
end of the scan to avoid an additional 50μs power-up
delay for each individual temperature channel. See the
22
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MAX11015 功能描述:射频放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX11015BGTM 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Automatic RF MESFET Amplifier Drain-Current Controllers
MAX11015BGTM+ 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Automatic RF MESFET Amplifier Drain-Current Controllers
MAX11017 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX11017ATL+ 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX11017ETL+ 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX11019 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32