參數(shù)資料
型號： MX7705EUE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC
中文描述： 2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： TSSOP-16
文件頁數(shù)： 19/34頁
文件大小： 664K
代理商： MX7705EUE
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 V
REF
= V
REF+
- V
REF-.
For a gain of one and V
REF
= 2.5V, the full-scale volt-
age in unipolar mode is 2.5V and 1 LSB
≈
38.1μV. For a
gain of four, the full-scale voltage in unipolar mode is
0.625V (V
REF
/ GAIN) and 1 LSB
≈
9.5μV. The differen-
tial input voltage range in this example reduces from
2.5V to 0.625V, and the resolution increases, since the
LSB size decreased from 38.1μV to 9.5μV.
Calculate 1 LSB in bipolar mode using the following
equation:
where V
REF
= V
REF+
- V
REF-.
Unipolar and Bipolar Modes
The B/U bit in the setup register (Table 9) configures
the MX7705 for unipolar or bipolar transfer functions.
Figures 4 and 5 illustrate the unipolar and bipolar trans-
fer 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- =
V
REF
/ GAIN, where V
REF
= V
REF+
- V
REF-
.
In bipolar mode, the digital output code is in offset
binary. Positive full scale is given by AIN+ - AIN- =
+V
REF
/ GAIN and negative full scale is given by AIN+ -
AIN- = -V
REF
/ GAIN. When AIN+ = AIN-, the outputs
are at zero scale, which is the midpoint of the bipolar
transfer function.
When the MX7705 is in buffered mode, the absolute and
common-mode analog input voltage ranges reduce to
between (GND + 50mV) and (V
DD
- 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
=
M
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
______________________________________________________________________________________
19
Table 5. Input Sampling Capacitor vs. Gain
GAIN
1
2
4
8
–
128
INPUT SAMPLING CAPACITOR (C
SAMP
) (pF)
3.75
7.5
15
30
0
1
2
3
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
0000 0000 0000 0011
FULL-SCALE TRANSITION
1 LSB =
V
REF
(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
V
REF
/ GAIN
V
R
/
B
Figure 4. MX7705 Unipolar Transfer Function
1 LSB =
V
REF
(GAIN) (65,536)
0
+1
-1
0000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0010
+32,767
B
+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)
V
REF
/ GAIN
V
REF
/ GAIN
V
R
/
V
R
/
Figure 5. MX7705 Bipolar Transfer Function
相關(guān)PDF資料
PDF描述
MX7705EWE 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC
MX7824LCWG CMOS, High-Speed, 8-Bit ADCs with Multiplexer
MX7828KCAI CMOS, High-Speed, 8-Bit ADCs with Multiplexer
MX7824LEAG CMOS, High-Speed, 8-Bit ADCs with Multiplexer
MX7828LEAI CMOS, High-Speed, 8-Bit ADCs with Multiplexer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MX7705EUE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch 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
MX7705EUE+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch 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
MX7705EUE-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
MX7705EWE 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
MX7705EWE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch 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
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*