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参数资料
型号： MAX1147BEUP+
厂商： Maxim Integrated Products
文件页数： 10/25页
文件大小： 0K
描述： IC ADC 14BIT 116KSPS 20-TSSOP
产品培训模块： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装： 74
位数： 14
采样率（每秒）： 116k
数据接口： MICROWIRE?，QSPI?，串行，SPI?
转换器数目： 1
功率耗散（最大）： 879mW
电压电源： 单电源
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 20-TSSOP（0.173"，4.40mm 宽）
供应商设备封装： 20-TSSOP
包装： 管件
输入数目和类型： 4 个单端，单极；4 个单端，双极；2 个差分，单极；2 个差分，双极
产品目录页面： 1395 (CN2011-ZH PDF)
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
18
______________________________________________________________________________________
Shutdown and Power-Down Modes
The MAX1146–MAX1149 provide a hardware shutdown
and two software power-down modes.
Pulling SHDN low places the converter in hardware
shutdown. The conversion is immediately terminated
and the supply current is reduced to 300nA. Allow 2ms
for the device to power-up when the internal reference
buffer is used with CREFADJ = 0.01F and CREF =
2.2F. Larger capacitors on CREFADJ and CREF
increase the power-up time (Table 6). No wake-up time
is needed for the device to power-up from fast power-
down when using an external reference.
Select a software power-down mode through the PD1
and PD0 bits of the control byte (Table 1). When the
conversion in progress is complete, software power-
down is initiated. The serial interface remains active
and the last conversion result can be clocked out. In
full power-down mode, only the serial interface remains
operational and the supply current is reduced to
300nA. In fast power-down mode, only the bandgap
reference and the serial interface remain operational,
and the supply current is reduced to 600A.
The MAX1146–MAX1149 automatically wake up from
software power-down when they receive the control
byte’s start bit (Table 1). Allow 2ms for the device to
power-up when the internal reference buffer is used
with CREFADJ = 0.01F and CREF = 2.2F. Larger
capacitors on CREFADJ and CREF increase the power-
up time (Table 6). No wake-up time is needed for the
device to power-up from fast power-down when using
an external reference.
Reference Voltage
The MAX1146–MAX1149 can be used with an internal
or external reference voltage. The reference voltage
determines the ADC input range. The reference deter-
mines the full-scale output value (Table 7).
Internal Reference
The MAX1146–MAX1149 contain an internal 1.250V
bandgap reference. This bandgap reference is connect-
ed to REFADJ through a 20k
resistor. Bypass REFADJ
with a 0.01F capacitor to AGND. The MAX1146/
MAX1148 reference buffer has a 3.277V/V gain to pro-
vide +4.096V at REF. The MAX1147/MAX1149 reference
buffer has a 2.000V/V gain to provide +2.500V at REF.
Bypass REF with a minimum 2.2F capacitor to AGND
when using the internal reference.
External Reference
An external reference can be applied to the
MAX1146–MAX1149 in two ways:
1) Disable the internal reference buffer by connecting
REFADJ to VDD and apply the external reference to
REF (Figure 12).
2) Utilize the internal reference buffer by applying an
external reference to REFADJ (Figure 13).
SCLK
SSTRB
DIN
START SEL2 SEL1
SEL0
PD1
PD0
18
INPUT MUX
INPUT T/H
SET ACCORDING TO PREVIOUS
CONTROL BYTE
TRACK
HOLD
tCONV
DOUT
HIGH-Z
tACQ
14
TRACK
D13 D12
10
18
D5
D4
D3
D2
D1
D0
11
HOLD
14
D13
D12
START
10
D5
D4
SEL2
11
TRACK
CB1
CB2
SET TO CB2
SET TO CB1
RESET TO CB1
OPEN
RESET TO CB2
OPEN
CS
START SEL2 SEL1
SEL0
PD1
PD0
SGL/DIF UNI/BIP
tACQ
Figure 11. Internal Clock Mode—18 Clocks/Conversion Timing
CREFADJ*
CREF
POWER-UP TIMES FROM AN
EXTENDED POWER-DOWN
0.01F
4.7F
2ms
0.1F
10F
25ms
Table 6. Internal Reference Buffer Power-
Up Times vs. Bypass Capacitors
*Power-up times are dominated by CREFADJ.
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相关代理商/技术参数
参数描述
MAX1147BEUP+ 功能描述:模数转换器 - ADC 14-Bit 4Ch 116ksps 3.3V Precision 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
MAX1147BEUP+T 功能描述:模数转换器 - ADC 14-Bit 4Ch 116ksps 3.3V Precision 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
MAX1147BEUP-T 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
MAX1148 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichannel, True-Differential, Serial, 14-Bit ADCs
MAX1148BCUP 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
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