參數(shù)資料
型號(hào)： MAX1242ACSA+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 12/13頁(yè)
文件大?。?/td> 0K
描述： IC ADC 10BIT SERIAL 8-SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 100
位數(shù)： 10
采樣率（每秒）： 73k
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 471mW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)單端，單極
MAX1242/MAX1243
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
8
Maxim Integrated
Serial Interface
Initialization after Power-Up and
Starting a Conversion
When power is first applied, and if SHDN is not pulled
low, it takes the fully discharged 4.7F reference
bypass capacitor up to 20ms to provide adequate
charge for specified accuracy. With an external refer-
ence, the internal reset time is 10s after the power
supplies have stabilized. No conversions should be
performed during these times.
To start a conversion, pull CS low. At CS’s falling edge,
the T/H enters its hold mode and a conversion is initiat-
ed. After an internally timed conversion period, the end
of conversion is signaled by DOUT pulling high. Data
can then be shifted out serially with the external clock.
Using
S
SH
HD
DN
N to Reduce Supply Current
Power consumption can be reduced significantly by
shutting down the MAX1242/MAX1243 between con-
versions. Figure 6 shows a plot of average supply cur-
rent vs. conversion rate. Because the MAX1243 uses
an external reference voltage (assumed to be present
continuously), it “wakes up” from shutdown more quick-
ly, providing lower average supply currents. The wake-
up time, tWAKE, is the time from SHDN deasserted to
the time when a conversion may be initiated (Figure 5).
For the MAX1242, this time depends on the time in
shutdown (Figure 7) because the external 4.7F refer-
ence bypass capacitor loses charge slowly during
shutdown. The MAX1243’s wake-up time is largely
dependent on the external reference’s power-up time. If
the external reference is not shut down, the wake-up
time is approximately 4s.
10,000
100
1000
1
0.1
1
10
100
1k
10k
100k
10
CONVERSIONS/SEC
SUPPLY
CURRENT
(μ
A)
VDD = VREF
RLOAD =
∞, CLOAD = 50pF
CODE = 0101010100
MAX1243-fig06
MAX1242
VDD = 3V
MAX1242
VDD = 5V
MAX1243
VDD = 3V
Figure 6. Average Supply Current vs. Conversion Rate
1.0
0.0
0.001
0.01
0.1
1
10
0.8
0.6
0.4
0.2
TIME IN SHUTDOWN (sec)
POWER-UP
DELAY
(ms)
MAX1242/43-07
Figure 7. Typical Reference-Buffer Power-Up Delay vs. Time in
Shutdown
COMPLETE CONVERSION SEQUENCE
tWAKE
POWERED UP
POWERED DOWN
POWERED UP
CONVERSION 0
CONVERSION 1
DOUT
CS
SHDN
Figure 5. Shutdown Sequence
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1242ACSA+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 73ksps 5.25V 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
MAX1242ACSA+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 73ksps 5.25V 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
MAX1242ACSA-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
MAX1242AEPA 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
MAX1242AEPA+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 73ksps 5.25V 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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