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參數(shù)資料
| 型號(hào)： | MX7705EWE |
| 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： | SOP-16 |
| 文件頁(yè)數(shù)： | 18/34頁(yè) |
| 文件大?。?/td> | 664K |
| 代理商： | MX7705EWE |
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M
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 (V
GND
+ 50mV) to (V
DD
- 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 (V
DD
+ 30mV) (see the
Electrical Characteristics
). In buffered mode, the ana-
log input voltage range is reduced to (GND + 50mV) to
(V
DD
- 1.5V). In both buffered and unbuffered modes,
the differential analog input range (V
AIN+
- V
AIN-
)
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, V
REF
. The common-mode
voltage range for V
REF+
and V
REF-
is between GND
and V
DD
. For specified operation, the nominal voltage,
V
REF
(V
REF+
- V
REF-
), is 1.225V for V
DD
= 4.75V to
5.25V and 2.5V for V
DD
= 2.7V to 3.6V.
The MX7705 samples REF+ and REF- at f
CLKIN
/ 64
(CLKDIV = 0) or f
CLKIN
/ 128 (CLKDIV = 1) with an
internal 10pF (typ for gain = 1) sampling capacitor in
series with a 7k
(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, C
SAMP
, 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
R
SW
(7k
TYP)
C
TOTAL
(7pF TYP FOR GAIN = 1)
AIN(+)
AIN(-)
V
BIAS
C
TOTAL
= C
SAMP
+ C
STRAY
Figure 1. Unbuffered Analog Input Structure
0.1
1
10
100
1
10
100
1000
10,000
EXTERNAL CAPACITANCE (pF)
E
)
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)
E
)
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MX7705EWE+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 |
| MX7705EWE-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 |
| MX7820 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS.1.3µ.s.8-Bit ADC with Voltage Reference and Track/Hold |
| MX7820BQ | 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 |
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