参数资料
| 型号： | MX7705EUE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/33页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 2CH 16-TSSOP |
| 产品培训模块： | MAX11200 ADC Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 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）： | 755mW |
| 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： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个差分，单极 |
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MX7705
To minimize gain errors in unbuffered mode, select a
source impedance less than the maximum values
shown in Figures 2 and 3. These are the maximum
external resistance/capacitance combinations allowed
before gain errors greater than 1 LSB are introduced in
unbuffered mode.
Enable the internal input buffer for a high source imped-
ance. This isolates the inputs from the sampling capaci-
tor and reduces the sampling-related gain error. When
using the internal buffer, limit the absolute input voltage
range to (VGND + 50mV) to (VDD - 1.5V). Set gain and
common-mode voltage range properly to minimize lin-
earity errors.
Input Voltage Range
In unbuffered mode, the absolute analog input voltage
range is from (GND - 30mV) to (VDD + 30mV) (see the
Electrical Characteristics). In buffered mode, the ana-
log input voltage range is reduced to (GND + 50mV) to
(VDD - 1.5V). In both buffered and unbuffered modes,
the differential analog input range (VAIN+ - VAIN-)
decreases at higher gains (see the
Programmable-Gain
Amplifier and the Unipolar and Bipolar Modes sections).
Reference
The MX7705 provides differential inputs, REF+ and REF-,
for an external reference voltage. Connect the external
reference directly across REF+ and REF- to obtain the
differential reference voltage, VREF. The common-mode
voltage range for VREF+ and VREF- is between GND
and VDD. For specified operation, the nominal voltage,
VREF (VREF+ - VREF-), is 2.5V for VDD = 4.75V to 5.25V
and 1.225V for VDD = 2.7V to 3.6V.
The MX7705 samples REF+ and REF- at fCLKIN / 64
(CLKDIV = 0) or fCLKIN / 128 (CLKDIV = 1) with an
internal 10pF (typ for gain = 1) sampling capacitor in
series with a 7k
Ω (typ) switch on-resistance.
Programmable-Gain Amplifier
A PGA provides selectable levels of gain: 1, 2, 4, 8, 16,
32, 64, and 128. Bits G0, G1, and G2 in the setup reg-
ister control the gain (Table 9). As the gain increases,
the value of the input sampling capacitor, CSAMP, also
increases (Table 5). The dynamic load presented to the
analog inputs increases with clock frequency and gain
in unbuffered mode (see the
Input Buffers section and
Figure 1).
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
18
______________________________________________________________________________________
HIGH
IMPEDANCE
RSW (7k
Ω TYP)
CTOTAL(7pF TYP FOR GAIN = 1)
AIN(+)
AIN(-)
VBIAS
CTOTAL = CSAMP + CSTRAY
Figure 1. Unbuffered Analog Input Structure
0.1
1
10
100
1
10
100
1000
10,000
EXTERNAL CAPACITANCE (pF)
EXTERNAL
RESIST
ANCE
(k
Ω
)
GAIN = 1
GAIN = 2
GAIN = 4
GAIN = 8 TO 128
Figure 2. Maximum External Resistance vs. Maximum External
Capacitance for Unbuffered Mode (1MHz)
0.1
1
10
100
1
10
100
1000
10,000
EXTERNAL CAPACITANCE (pF)
EXTERNAL
RESIST
ANCE
(k
Ω
)
GAIN = 2
GAIN = 4
GAIN = 8 TO 128
GAIN = 1
Figure 3. Maximum External Resistance vs. Maximum External
Capacitance for Unbuffered Mode (2.4576MHz)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MX7705EUE+ | 功能描述:模数转换器 - ADC 16-Bit 2Ch 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 |
| MX7705EUE+T | 功能描述:模数转换器 - ADC 16-Bit 2Ch 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 |
| MX7705EUE-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 |
| MX7705EWE | 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 |
| MX7705EWE+ | 功能描述:模数转换器 - ADC 16-Bit 2Ch 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 |
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