参数资料
型号: MAX1415AEWE+T
厂商: Maxim Integrated Products
文件页数: 14/36页
文件大小: 0K
描述: IC ADC 16BIT DELTA SIGMA 16-SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1,000
位数: 16
采样率(每秒): 500
数据接口: MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 762mW
电压电源: 单电源
工作温度: -45°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC W
包装: 带卷 (TR)
输入数目和类型: 2 个差分,单极;2 个差分,双极
Increasing the gain increases the resolution of the ADC
(LSB size decreases), but reduces the differential input
voltage range. Calculate 1 LSB in unipolar mode using
the following equation:
where: VREF = VREF+ - VREF-.
For a gain of 1 and VREF = 2.5V, the full-scale voltage
in unipolar mode is 2.5V and 1 LSB
≈ 38.1V. For a
gain of 4, the full-scale voltage in unipolar mode is
0.625V (VREF/GAIN) and 1 LSB
≈ 9.5V. The differential
input voltage range in this example reduces from 2.5V
to 0.625V, and the resolution increases since the LSB
size decreases from 38.1V to 9.5V.
Calculate 1 LSB in bipolar mode using the following
equation:
where: VREF = VREF+ - VREF-.
Unipolar and Bipolar Modes
The
B/U bit in the setup register (Table 9) configures
the MAX1415/MAX1416 for unipolar or bipolar transfer
functions. Figures 4 and 5 illustrate the unipolar and
bipolar transfer functions, respectively.
In unipolar mode, the digital output code is straight
binary. When AIN+ = AIN-, the outputs are at zero
scale, which is the lower endpoint of the transfer func-
tion. The full-scale endpoint is given by AIN+ - AIN- =
VREF / GAIN, where VREF = VREF+ - VREF-.
In bipolar mode, the digital output code is in offset
binary. Positive full scale is given by AIN+ - AIN- =
+VREF / GAIN and negative full scale is given by AIN+ -
AIN- = -VREF / GAIN. When AIN+ = AIN-, the outputs
are at zero scale, which is the midpoint of the bipolar
transfer function.
When the MAX1415/MAX1416 are in buffered mode, the
absolute and common-mode analog input voltage
ranges reduce to between (GND + 50mV) and (VDD -
1.5V). The differential input voltage range is not affected
in buffered mode.
1
65 536
2
(,
)
LSB
V
GAIN
REF
1
65 536
(,
)
LSB
V
GAIN
REF
=
MAX1415/MAX1416
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADCs
______________________________________________________________________________________
21
Table 5. Input Sampling Capacitor vs. Gain
GAIN
INPUT SAMPLING CAPACITOR (CSAMP)
(pF)
1
3.75
2
7.5
415
8–128
30
01
2
3
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
0000 0000 0000 0011
FULL-SCALE TRANSITION
1 LSB =
VREF
(GAIN) (65,536)
65,535
65,533
DIFFERENTIAL INPUT VOLTAGE (LSB)
1111 1111 1111 1101
1111 1111 1111 1110
1111 1111 1111 1111
1111 1111 1111 1100
VREF/GAIN
V
REF
/GAIN
BINAR
Y
OUTPUT
CODE
Figure 4. MAX1415/MAX1416 Unipolar Transfer Function
1 LSB =
VREF
(GAIN) (65,536)
0+1
-1
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
+32,767
BINAR
Y
OUTPUT
CODE
+32,765
1111 1111 1111 1101
1111 1111 1111 1110
1111 1111 1111 1111
1000 0000 0000 0000
1000 0000 0000 0001
0111 1111 1111 1111
x 2
-32,768
-32,766
DIFFERENTIAL INPUT VOLTAGE (LSB)
VREF/GAIN
V
REF
/GAIN
V
REF
/GAIN
Figure 5. MAX1415/MAX1416 Bipolar Transfer Function
相关PDF资料
PDF描述
MAX1421CCM+D IC ADC 12BIT 40MSPS 48LQFP
MAX1426EAI+T IC ADC 10BITS 10MSPS 28SSOP
MAX1434ECQ+D IC ADC 10BIT 50MSPS 100-TQFP
MAX1444EHJ+T IC ADC 10BIT 40MSPS 32-TQFP
MAX1499ECJ+ IC ADC 3 1/2DIG W/LED DVR 32TQFP
相关代理商/技术参数
参数描述
MAX1415ENE 制造商:Maxim Integrated Products 功能描述:16-BIT, LOW-POWER, 2-CHANNEL, SIGMA-DELTA ADC - Rail/Tube
MAX1415EPE 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
MAX1415EPE+ 功能描述:模数转换器 - ADC 16-Bit 2Ch .5ksps 1.75V 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
MAX1415EUE 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
MAX1415EUE+ 功能描述:模数转换器 - ADC 16-Bit 2Ch .5ksps 1.75V 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