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参数资料
型号： MAX1188
厂商： Maxim Integrated Products, Inc.
元件分类： ADC
英文描述： 16-Bit. 135ksps. Single-Supply ADCs with Bipolar Analog Input Range
中文描述： 16位、135ksps、单电源ADC，提供双极性模拟输入范围
文件页数： 10/14页
文件大小： 330K
代理商： MAX1188
M
External Reference
An external reference can be placed at either the input
(REFADJ) or the output (REF) of the MAX1178/
MAX1188s
’
internal buffer amplifier. Using the buffered
REFADJ input makes buffering the external reference
unnecessary. The input impedance of REFADJ is typi-
cally 5k
. The internal buffer output must be bypassed
at REF with a 10μF capacitor.
Connect REFADJ to AV
DD
to disable the internal buffer.
Directly drive REF using an external 3.8V to 4.2V refer-
ence. During conversion, the external reference must
be able to drive 100μA of DC load current and have an
output impedance of 10
or less.
For optimal performance, buffer the reference through
an op amp and bypass REF with a 10μF capacitor.
Consider the MAX1178/MAX1188s
’
equivalent input
noise (0.6 LSB) when choosing a reference.
Reading the Conversion Result
EOC
is provided to flag the μP when a conversion is
complete. The falling edge of
EOC
signals that the data
is valid and ready to be output to the bus. D0
–
D15 are
the parallel outputs of the MAX1178/MAX1188. These
tri-state outputs allow for direct connection to a micro-
controller I/O bus. The outputs remain high impedance
during acquisition and conversion. Data is loaded onto
the output bus with the third falling edge of
CS
with R/
C
high (after t
DO
). Bringing
CS
high forces the output bus
back to high impedance. The MAX1178/MAX1188 then
wait for the next falling edge of
CS
to start the next con-
version cycle (Figure 2).
HBEN toggles the output between the high/low byte. The
low byte is loaded onto the output bus when HBEN is
low, and the high byte is on the bus when HBEN is high.
Transfer Function
Figures 8 and 9 show the MAX1178/MAX1188 output
transfer functions. The MAX1178 and MAX1188 outputs
are coded in offset binary.
Input Buffer
Most applications require an input buffer amplifier to
achieve 16-bit accuracy and prevent loading the
source. When the input signal is multiplexed, switch the
channels immediately after acquisition, rather than near
the end of, or after, a conversion. This allows more time
for the input buffer amplifier to respond to a large step
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
10
______________________________________________________________________________________
+5V
68k
100k
150k
0.1
μ
F
REFADJ
MAX1178
MAX1188
OUTPUT CODE
FULL-SCALE
TRANSITION
FULL-SCALE RANGE (FSR) = +20V
MAX1188
INPUT RANGE = -10V TO +10V
1 LSB =
FSR x V
REF
65,536 x 4.096
1111 1111 1111 1111
1111 1111 1111 1110
1111 1111 1111 1101
-32,68
+32,768
INPUT VOLTAGE (LSB)
0000 0000 0000 0011
0000 0000 0000 0010
0000 0000 0000 0001
0000 0000 0000 0000
1000 0000 0000 0000
0001 1111 1111 1111
1000 0000 0000 0001
0
-32,766
-32,767 -32,765
+32,767
+32,766
-1
+1
Figure 7. MAX1178/MAX1188 Reference-Adjust Circuit
OUTPUT CODE
FULL-SCALE
TRANSITION
FULL-SCALE RANGE (FSR) = +1V
MAX1178
INPUT RANGE = -5V TO +5V
1 LSB =
FSR x V
REF
65,536 x 4.096
11 1111 1111 1111
11 1111 1111 1110
11 1111 1111 1101
-32,768
+32,768
INPUT VOLTAGE (LSB)
00 0000 0000 0011
00 0000 0000 0010
00 0000 0000 0001
00 0000 0000 0000
10 0000 0000 0000
01 1111 1111 1111
10 0000 0000 0001
0
-32,766
-32,767 -32,765
+32,767
+32,766
-1
+1
Figure 8. MAX1178 Transfer Function
Figure 9. MAX1188 Transfer Function
相关PDF资料
PDF描述
MAX1178ACUP 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range
MAX1178AEUP 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range
MAX1178BCUP 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range
MAX1178CCUP 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range
MAX1178CEUP 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range
相关代理商/技术参数
参数描述
MAX1188ACUP 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
MAX1188ACUP+ 功能描述:模数转换器 - ADC 16-Bit 135ksps 4.2V 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
MAX1188ACUP+T 功能描述:模数转换器 - ADC 16-Bit 135ksps 4.2V 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
MAX1188ACUP-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
MAX1188AEUP 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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