參數資料
| 型號： | MAX1403CAI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 29/36頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT LP 28-SSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,000 |
| 位數： | 18 |
| 采樣率（每秒）： | 480 |
| 數據接口： | QSPI?，串行，SPI? |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 21.45mW |
| 電壓電源： | 模擬和數字 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 28-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數目和類型： | 3 個差分，單極；3 個差分，雙極；5 個偽差分，單極；5 個偽差分，雙極 |
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MAX1403
+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
______________________________________________________________________________________
35
Unlike the 3-wire configuration, the 4-wire configuration
(Figure 18) has no error associated with lead resis-
tances, as no current flows in the measurement leads
connected to AIN1 and AIN2. Current source OUT1
provides the excitation current for the RTD, and current
source OUT2 provides current to generate the refer-
ence voltage. This reference voltage, developed across
RREF, ensures that the analog input voltage span
remains ratiometric to the reference voltage. RTD temp-
co errors in the analog input voltage are due to the tem-
perature drift of the RTD current source and are
compensated for by the variation in the reference volt-
age. A common resistance value for the RTD is 100
,
generating a 20mV signal directly handled at the ana-
log input of the MAX1403. The voltage at OUT1 and
OUT2 can go to within 1.0V of the V+ supply.
Power Supplies
No specific power sequence is required for the
MAX1403; either the V+ or the VDD supply can come
up first. While the latchup performance of the MAX1403
is good, to avoid latchup it is important that power be
applied to the MAX1403 before the analog input signals
(AIN_) or the CLKIN inputs. If this is not possible, then
the current flow into any of these pins should be limited
to 50mA. If separate supplies are used for the
MAX1403 and the system digital circuitry, then the
MAX1403 should be powered up first.
Grounding and Layout
For best performance, use printed circuit boards with
separate analog and digital ground planes. Wire-wrap
boards are not recommended.
Design the printed circuit board so that the analog and
digital sections are separated and confined to different
areas of the board. Join the digital and analog ground
planes at only one point. If the MAX1403 is the only
device requiring an AGND to DGND connection, then
the ground planes should be connected at the AGND
and DGND pins of the MAX1403. In systems where mul-
tiple devices require AGND to DGND connections, the
connection should still be made at only one point. Make
the star ground as close to the MAX1403 as possible.
Avoid running digital lines under the device because
these may couple noise onto the die. Run the analog
ground plane under the MAX1403 to minimize coupling
of digital noise. Make the power-supply lines to the
MAX1403 as wide as possible to provide low-imped-
ance paths and reduce the effects of glitches on the
power-supply line.
Figure 18. 4-Wire RTD Application
V+
200
A
+3V
VDD
OUT2
REFIN+
AIN1
AIN2
AGND
DGND
PGA
MODULATOR
GAIN = 1 TO 128
200
A
RTD
RREF
REFIN-
OUT1
MAX1403
DGND
GAIN = 1 TO 128
PGA
MODULATOR
MAX1403
200
A
200
A
OUT1
AIN1
12.5k
AIN2
OUT2
AGND
RL3
RL2
RL1
V+
VDD
REFIN- REFIN+
RTD
Figure 17. 3-Wire RTD Application
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1403EAI | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| MAX1403EAI+ | 功能描述:模數轉換器 - ADC 18-Bit 5Ch 4.8ksps 1.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| MAX1403EAI+T | 功能描述:模數轉換器 - ADC 18-Bit 5Ch 4.8ksps 1.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| MAX1403EAI-T | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| MAX1403EVKIT | 功能描述:數據轉換 IC 開發(fā)工具 MAX1403 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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