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+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CONVERSION RATE (continued)
Internal Clock Frequency
SHDN = unconnected
1.8
MHz
SHDN = VDD
0.225
External Clock Frequency
0.1
2.0
MHz
Data transfer only
1
2.0
ANALOG/COM INPUTS
Input Voltage Range, Single-
Ended and Differential (Note 6)
Unipolar, COM = 0
0 to VREF
V
Bipolar, VCOM = VREF/2
±VREF/2
Multiplexer Leakage Current
On/off leakage current, VCH_ = 0 or VDD
±0.01
±1
μA
Input Capacitance
16
pF
INTERNAL REFERENCE (MAX149 Only, Reference Buffer Enabled)
VREF Output Voltage
TA = +25°C (Note 7)
2.470
2.500
2.530
V
VREF Short-Circuit Current
30
mA
VREF Temperature Coefficient
MAX149
±30
ppm/
°C
Load Regulation (Note 8)
0 to 0.2mA output load
0.35
mV
Capacitive Bypass at VREF
Internal compensation mode
0
μF
External compensation mode
4.7
Capacitive Bypass at REFADJ
0.01
μF
REFADJ Adjustment Range
±1.5
%
EXTERNAL REFERENCE AT VREF (Buffer Disabled)
VREF Input Voltage Range
(Note 9)
1.0
VDD +
50mV
V
VREF Input Current
VREF = 2.500V
100
150
μA
VREF Input Resistance
18
25
k
Shutdown VREF Input Current
0.01
10
μA
REFADJ Buffer-Disable Threshold
VDD -
0.5
V
EXTERNAL REFERENCE AT REFADJ
Capacitive Bypass at VREF
Internal compensation mode
0
μF
External compensation mode
4.7
Reference Buffer Gain
MAX149
2.06
V/V
MAX148
2.00
REFADJ Input Current
MAX149
±50
μA
MAX148
±10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX149ACPP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 8Ch 133ksps 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 |
| MAX149AEAP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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 |
| MAX149AEAP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 8Ch 133ksps 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 |
| MAX149AEAP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 8Ch 133ksps 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 |
| MAX149AEAP-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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