參數(shù)資料
型號(hào)： MAX1402EAI+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 17/38頁(yè)
文件大?。?/td> 0K
描述： IC ADC 18BIT LP 28-SSOP
產(chǎn)品培訓(xùn)模塊： MAX11200 ADC
Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 46
位數(shù)： 18
采樣率（每秒）： 480
數(shù)據(jù)接口： QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 34mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 28-SSOP
包裝： 管件
輸入數(shù)目和類型： 3 個(gè)差分，單極；3 個(gè)差分，雙極；5 個(gè)偽差分，單極；5 個(gè)偽差分，雙極
產(chǎn)品目錄頁(yè)面： 1396 (CN2011-ZH PDF)
MAX1402
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
24
______________________________________________________________________________________
have low absolute temperature coefficients and tight
TC matching. Optimized for transducer excitation, the
current sources possess tight temperature tracking
allowing accurate compensation of errors due to IR
drops in long transducer cable runs. They may be
enabled or disabled using a single register control bit
(IOUT).
Dynamic Input Impedance at the
Channel Selection Network
When used in unbuffered mode (BUFF = 0), the analog
inputs present a dynamic load to the driving circuitry.
The size of the sampling capacitor and the input sam-
pling frequency (Figure 5) determine the dynamic load
seen by the driving circuitry. The MAX1402 samples at a
constant rate for all gain settings. This provides a maxi-
mum time for the input to settle at a given data rate. The
dynamic load presented by the inputs varies with the
gain setting. For gains of +2V/V, +4V/V, and +8V/V, the
input sampling capacitor increases with the chosen
gain. Gains of +16V/V, +32V/V, +64V/V, and +128V/V
present the same input load as the x8 gain setting.
When designing with the MAX1402, as with any other
switched-capacitor ADC input, consider the advantages
and disadvantages of series input resistance. A series
resistor reduces the transient-current impulse to the
external driving amplifier. This improves the amplifier
phase margin and reduces the possibility of ringing.
The resistor spreads the transient-load current from the
sampler over time due to the RC time constant of the
circuit. However, an improperly chosen series resis-
tance can hinder performance in fast 16-bit converters.
The settling time of the RC network can limit the speed
at which the converter can operate properly, or reduce
the settling accuracy of the sampler. In practice, this
means ensuring that the RC time constant—resulting
from the product of the driving source impedance and
the capacitance presented by both the MAX1402’s
input and any external capacitances—is sufficiently
small to allow settling to the desired accuracy. Tables
13a–13d summarize the maximum allowable series
resistance vs. external capacitance for each MAX1402
gain setting in order to ensure 16-bit performance in
unbuffered mode.
REXT
CEXT
RMUX
CPIN
RSW
CST
CSAMPLE
CC
Figure 5. Analog Input, Unbuffered Mode (BUFF = 0)
Table 13a. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—1x Modulator Sampling Frequency (MF1, MF0 = 00); X2CLK = 0; CLKIN = 2.4576MHz
Table 13b. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—2x Modulator Sampling Frequency (MF1, MF0 = 01); X2CLK = 0; CLKIN =
2.4576MHz
45
20
45
20
13
2
34
17
22
13
9.7
8, 16, 32,
64, 128
12
13
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
3.9
2.2
3.9
2.2
0.58
3.6
2.0
3.3
1.9
0.49
0.53
PGA GAIN
0.58
CEXT = 50pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE REXT (k)
23
9.9
23
9.9
6.5
2
17
8.5
11.2
6.7
4.9
8, 16, 32,
64, 128
5.8
6.5
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
1.9
1.1
1.9
1.1
0.29
1.8
1.0
1.6
0.93
0.24
0.27
PGA GAIN
0.29
CEXT = 500pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE REXT (k)
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參數(shù)描述
MAX1402EAI+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 5Ch 4.8ksps 2.5V 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
MAX1402EAI+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 5Ch 4.8ksps 2.5V 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
MAX1402EAI+TW 功能描述:ADC / DAC多通道 +5V 18-Bit Low-Power Multichannel Oversampling (Sigma-Delta) ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX1402EAI+W 功能描述:ADC / DAC多通道 +5V 18-Bit Low-Power Multichannel Oversampling (Sigma-Delta) ADC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX1402EAI-T 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40
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