參數(shù)資料
型號(hào)： MAX1265BEEI+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 2/19頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12-BIT 265KSPS 28-QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 50
位數(shù)： 12
采樣率（每秒）： 265k
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 5.4mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 28-QSOP
包裝： 管件
輸入數(shù)目和類型： 6 個(gè)單端，單極；6 個(gè)單端，雙極；3 個(gè)偽差分，單極；3 個(gè)偽差分，雙極
產(chǎn)品目錄頁(yè)面： 1396 (CN2011-ZH PDF)
MAX1265/MAX1267
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
10
______________________________________________________________________________________
of the conversion cycle to restore node 0 to 0V within
the limits of 12-bit resolution. This action is equivalent to
transferring a 12pF (VIN+ - VIN-) charge from CHOLD 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 VDD and GND, allow each input channel to
swing within (GND - 300mV) to (VDD + 300mV) without
damage. However, for accurate conversions near full
scale, both inputs must not exceed (VDD + 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 MAX1265/MAX1267 T/H stage enters its tracking
mode on WR’s rising edge. In external acquisition
mode, the part enters its hold mode on the next rising
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 1s 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 CHOLD
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,
the acquisition time lengthens and more time must be
allowed between conversions. The acquisition time,
tACQ, is the maximum time the device takes to acquire
the signal, and is also the minimum time required for
the signal to be acquired. Calculate this with the follow-
ing equation:
tACQ = 9(RS + RIN)CIN
where RS is the source impedance of the input signal,
RIN (800
) is the input resistance, and CIN (12pF) is
the input capacitance of the ADC. Source impedances
below 3k
have no significant impact on the MAX1265/
MAX1267s’ AC performance.
Higher source impedances can be used if a 0.01F
capacitor is connected to the individual analog inputs.
A1
CH0
0
+
0
-
0
A0
0
1
CH2*
CH4*
+
-
0
1
0
+
CH3*
-
0
CH1
COM
1
CH5*
1
+
-
0
A2
+
-
1
0
1
-
+
1
Table 2. Channel Selection for Single-Ended Operation (SGL/DIF = 1)
Table 3. Channel Selection for Pseudo-Differential Operation (SGL/DIF = 0)
A1
CH0
0
+
0
-
0
A0
0
-
1
CH2*
CH4*
+
0
1
0
+
-
CH3*
0
CH1
1
CH5*
1
-
+
0
A2
+
-
1
0
1
-
+
1
*Channels CH2–CH5 apply to MAX1265 only.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1265BEEI+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6Ch 265ksps 3.6V 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
MAX1265BEEI+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 6Ch 265ksps 3.6V 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
MAX1265BEEI-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
MAX1266ACEI 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
MAX1266ACEI+ 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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