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參數(shù)資料
| 型號(hào)： | MAX189BEPA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SERIAL LP 8-DIP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 75k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 500mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極 |
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MAX187/MAX189
+5V, Low-Power, 12-Bit Serial ADCs
9
Maxim Integrated
Figure 5. MAX187/MAX189 Shutdown Sequence
Input Protection
Internal protection diodes that clamp the analog input
allow the input to swing from GND - 0.3V to VDD + 0.3V
without damage. However, for accurate conversions near
full scale, the input must not exceed VDD by more than
50mV, or be lower than GND by 50mV.
If the analog input exceeds the supplies by more than
50mV beyond the supplies, limit the input current
to 2mA, since larger currents degrade conversion
accuracy.
Driving the Analog Input
The input lines to AIN and GND should be kept as short
as possible to minimize noise pickup. Shield longer
leads. Also see the Input Protection section.
Because the MAX187/MAX189 incorporate a T/H, the
drive requirements of the op amp driving AIN are less
stringent than those for a successive-approximation ADC
without a T/H. The typical input capacitance is 16pF. The
amplifier bandwidth should be sufficient to handle the
frequency of the input signal. The MAX400 and OP07
work well at lower frequencies. For higher-frequency
operation, the MAX427 and OP27 are practical choices.
The allowed input frequency range is limited by the
75ksps sample rate of the MAX187/MAX189. Therefore,
the maximum sinusoidal input frequency allowed is
37.5kHz. Higher-frequency signals cause aliasing prob-
lems unless undersampling techniques are used.
Reference
The MAX187 can be used with an internal or external ref-
erence, while the MAX189 requires an external reference.
Internal Reference
The MAX187 has an on-chip reference with a buff-
ered temperature-compensated bandgap diode, laser-
trimmed to +4.096V Q0.5%. Its output is connected to
REF and also drives the internal DAC. The output can be
used as a reference voltage source for other components
and can source up to 0.6mA. Decouple REF with a 4.7FF
capacitor. The internal reference is enabled by pulling
the SHDN pin high. Letting SHDN float disables the inter-
nal reference, which allows the use of an external refer-
ence, as described in the External Reference section.
External Reference
The MAX189 operates with an external reference at the
REF pin. To use the MAX187 with an external reference,
disable the internal reference by letting SHDN float. Stay
within the voltage range +2.5V to VDD to achieve speci-
fied accuracy. The minimum input impedance is 12kI for
DC currents. During conversion, the external reference
must be able to deliver up to 350FA DC load current and
have an output impedance of 10I or less. The recom-
mended minimum value for the bypass capacitor is 0.1FF.
If the reference has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7FF capacitor.
DOUT
CS
SHDN
CONVERSION 1
tWAKE
COMPLETE CONVERSION SEQUENCE
POWERED DOWN
POWERED UP
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX189BEPA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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 |
| MAX189BEWE | 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 |
| MAX189BEWE+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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 |
| MAX189BEWE+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 75ksps 5.25V 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 |
| MAX189BEWE-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 |
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