參數(shù)資料
型號(hào)： MAX1294ACEI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： ADC
英文描述： 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
中文描述： 6-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-28
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 226K
代理商： MAX1294ACEI
M
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
10
______________________________________________________________________________________
During the acquisition interval, the channel selected as
the positive input (IN+) charges capacitor C
HOLD
. At
the end of the acquisition interval, the T/H switch
opens, retaining charge on C
HOLD
as a sample of the
signal at IN+.
The conversion interval begins with the input multiplex-
er switching C
HOLD
from the positive input (IN+) to the
negative input (IN-). This unbalances node ZERO at the
comparator’s positive input. The capacitive digital-to-
analog converter (DAC) adjusts during the remainder of
the conversion cycle to restore node ZERO to 0V within
the limits of 12-bit resolution. This action is equivalent to
transferring a 12pF [(V
IN
+ - V
IN
-)] charge from C
HOLD
to the binary-weighted capacitive DAC, which in turn
forms a digital representation of the analog input signal.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and GND, allow each input channel to
swing within (GND - 300mV) to (V
DD
+ 300mV) without
damage. However, for accurate conversions near full
scale, both inputs must not exceed (V
DD
+ 50mV) or be
less than (GND - 50mV).
If an analog input voltage exceeds the supplies by
more than 50mV, limit the forward-bias input current
to 4mA.
Track/Hold
The MAX1294/MAX1296 T/H stage enters its tracking
mode on the rising edge of
WR
. In external acquisition
mode, the part enters its hold mode on the next on ris-
ing edge of WR. In internal acquisition mode, the part
enters its hold mode on the fourth falling edge of clock
after writing the control byte. Note that in internal clock
mode this is approximately 1μs after writing the control
byte.
In single-ended operation, IN- is connected to COM
and the converter samples the positive “+” input. In
pseudo-differential operation, IN- connects to the nega-
tive input “-”, and the difference of
|
(IN+) - (IN-)
|
is sam-
pled. At the beginning of the next conversion, the
positive input connects back to IN+ and C
HOLD
charges to the input signal.
The time required for the T/H stage to acquire an input
signal depends on how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
A1
CH0
0
0
1
1
0
0
+
0
1
0
1
0
1
0
0
0
0
1
1
A0
CH2*
CH4*
+
+
CH3*
CH1
CH5*
+
A2
+
+
Table 2. Channel Selection for Single-Ended Operation (SGL/
DIF
= 1)
Table 3. Channel Selection for Pseudo-Differential Operation (SGL/
DIF
= 0)
A1
0
0
1
1
0
0
CH0
+
0
1
0
1
0
1
0
0
0
0
1
1
A0
CH2*
CH4*
+
+
-
+
CH3*
CH1
CH5*
A2
+
-
-
+
*Channels CH2–CH5 apply to MAX1294 only.
*Channels CH2–CH5 apply to MAX1294 only.
-
-
-
-
-
-
COM
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1294ACEI+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6Ch 420ksps 5.5V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX1294ACEI+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6Ch 420ksps 5.5V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX1294ACEI-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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX1294AEEI 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
MAX1294AEEI+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6Ch 420ksps 5.5V 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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