參數(shù)資料
型號： MAX1415EUE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADCs
中文描述： 2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 4.40 MM, MO-153AB, TSSOP-16
文件頁數(shù)： 20/36頁
文件大?。?/td> 669K
代理商： MAX1415EUE
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). Properly set
up the gain and common-mode voltage range to mini-
mize linearity 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
section). In buffered mode,
the analog 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
Unipolar and Bipolar Modes
sections).
Reference
The MAX1415/MAX1416 provide 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
is 1.225V for the MAX1415 and
2.5V for the MAX1416.
The MAX1415/MAX1416 sample REF+ and REF- at
f
CLKIN
/64 (CLKDIV = 0) or f
CLKIN
/128 (CLKDIV = 1)
with an internal 10pF (typ for gain = 1) sampling capac-
itor 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 (see Table 9). As the gain increas-
es, the value of the input sampling capacitor, C
SAMP
,
also increases (see Table 5). The dynamic load pre-
sented to the analog inputs increases with clock fre-
quency and gain in unbuffered mode (see the
Input
Buffers
section and Figure 1).
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADCs
20
______________________________________________________________________________________
HIGH-
IMPEDANCE
INPUT
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
MAXIMUM EXTERNAL RESISTANCE
vs. MAXIMUM EXTERNAL CAPACITANCE (1MHz)
100
GAIN = 1
0.1
1
10
1
10
100
1000
10,000
EXTERNAL CAPACITANCE (pF)
E
)
GAIN = 2
GAIN = 4
GAIN = 8 TO 128
Figure 2. Maximum External Resistance vs. Maximum External
Capacitance for Unbuffered Mode (1MHz)
MAXIMUM EXTERNAL RESISTANCE
vs. MAXIMUM EXTERNAL CAPACITANCE
(2.4576MHz)
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)
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1415EUE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch .5ksps 1.75V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1415EUE+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch .5ksps 1.75V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1415EUE-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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1415EWE 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1415EWE+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2Ch .5ksps 1.75V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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