參數(shù)資料
型號(hào)： MX7705EUE+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 11/33頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 2CH 16-TSSOP
產(chǎn)品培訓(xùn)模塊： MAX11200 ADC
Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 96
位數(shù)： 16
采樣率（每秒）： 500
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 755mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 管件
輸入數(shù)目和類型： 2 個(gè)差分，單極
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 one and VREF = 2.5V, the full-scale volt-
age in unipolar mode is 2.5V and 1 LSB
≈ 38.1V. For a
gain of four, the full-scale voltage in unipolar mode is
0.625V (VREF / GAIN) and 1 LSB
≈ 9.5V. 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 38.1V 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 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- =
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 MX7705 is 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
=
MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
______________________________________________________________________________________
19
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. MX7705 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. MX7705 Bipolar Transfer Function
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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
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