參數(shù)資料
型號(hào)： MAX195BEWE+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 85KSPS W/SD 16-SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 46
位數(shù)： 16
采樣率（每秒）： 85k
數(shù)據(jù)接口： QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 80mW
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 管件
輸入數(shù)目和類型： 1 個(gè)單端，單極；1 個(gè)單端，雙極
產(chǎn)品目錄頁(yè)面： 1393 (CN2011-ZH PDF)
MAX195
16-Bit, 85ksps ADC with 10A Shutdown
______________________________________________________________________________________
13
INPUT
SIGNAL
1N914
DIODE
CLAMPS
+5V
AIN
MAX195
-5V
VSSA
VDDA
+15V
-15V
10
Figure 12. Analog Input Protection for Overvoltage or Improper Supply Sequence
REF and AIN Input Protection
The REF and AIN signals should not exceed the
MAX195 supply rails. If this can occur, diode clamp the
signal to the supply rails. Use silicon diodes and a 10
current-limiting resistor (Figures 10 and 12) or Schottky
diodes without the resistor.
When using the current-limiting resistor, place the resis-
tor between the appropriate input (AIN or REF) and any
bypass capacitor. While this results in AC transients at
the input due to dynamic input currents, the transients
settle quickly and do not affect conversion results.
Improperly placing the bypass capacitor directly at the
input forms an RC lowpass filter with the current-limiting
resistor, which averages the dynamic input current and
causes linearity errors.
Analog Input
The MAX195 uses a capacitive DAC that provides an
inherent track/hold function. The input impedance is
typically 30
in series with 250pF in unipolar mode and
50
in series with 125pF in bipolar mode.
Input Range
The analog input range can be either unipolar (0V to
VREF) or bipolar (-VREF to VREF), depending on the
state of the BP/UP/SHDN pin (see
Digital Interface sec-
tion). The reference range is 0V to VDDA. When choos-
ing the reference voltage, the equivalent MAX195 input
noise (40VRMS in unipolar mode, 80VRMS in bipolar
mode) should be considered.
Input Acquisition and Settling
Four conversion-clock periods are allocated for acquir-
ing the input signal. At the highest conversion rate, four
clock periods is 2.4s. If more than three clock cycles
have occurred since the end of the previous conver-
sion, conversion begins on the next falling clock edge
after CONV goes low. Otherwise, bringing CONV low
begins a conversion on the fourth falling clock edge
after the previous conversion. This scheme ensures the
minimum input acquisition time is four clock periods.
Most applications require an input buffer amplifier. If
the input signal is multiplexed, the input channel should
be switched near the beginning of a conversion, rather
than near the end of or after a conversion (Figure 13).
This allows time for the input buffer amplifier to respond
to a large step change in input signal. The input amplifi-
er must have a high enough slew rate to complete the
required output voltage change
before the beginning of
the acquisition time.
At the beginning of acquisition, the capacitive DAC is
connected to the amplifier output, causing some output
disturbance. Ensure that the sampled voltage has set-
tled to within the required limits before the end of the
acquisition time. If the frequency of interest is low, AIN
can be bypassed with a large enough capacitor to
charge the capacitive DAC with very little change in
voltage (Figure 14). However, for AC use, AIN must be
driven by a wideband buffer (at least 10MHz), which
must be stable with the DAC’s capacitive load (in paral-
lel with any AIN bypass capacitor used) and also must
settle quickly (Figure 15 or 16).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX195BEWE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 85ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX195BEWE+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 85ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX195BEWE-T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX195BMDE 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX195EVC16-DIP 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Programmers, Development Systems RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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