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參數(shù)資料
| 型號(hào)： | MAX1240BESA/V+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 15/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT SRL 73KSPS 8SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 12 |
| 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： | -40°C ~ 85°C |
| 安裝類型： | 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： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極 |
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MAX1240/MAX1241
+2.7V, Low-Power,
12-Bit Serial ADCs in 8-Pin SO
_______________________________________________________________________________________
9
Input Bandwidth
The ADCs’ input tracking circuitry has a 2.25MHz small-
signal bandwidth, so it is possible to digitize high-
speed transient events and measure periodic signals
with bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid aliasing of
unwanted high-frequency signals into the frequency
band of interest, anti-alias filtering is recommended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to VDD and GND, allow the input to swing from
GND - 0.3V to VDD + 0.3V without damage. However,
for accurate conversions near full scale, the input must
not exceed VDD by more than 50mV, or be lower than
GND by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, limit the input current to 2mA.
Internal Reference (MAX1240)
The MAX1240 has an on-chip voltage reference
trimmed to 2.5V. The internal reference output is con-
nected to REF and also drives the internal capacitive
DAC. The output can be used as a reference voltage
source for other components and can source up to
400A. Bypass REF with a 4.7F capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see the section Using SHDN to Reduce Supply
Current). The internal reference is enabled by pulling the
SHDN pin high. Letting SHDN open disables the internal
reference, which allows the use of an external reference,
as described in the External Reference section.
External Reference
The MAX1240/MAX1241 operate with an external refer-
ence at the REF pin. To use the MAX1240 with an
external reference, disable the internal reference by let-
ting SHDN open. Stay within the +1.0V to VDD voltage
range to achieve specified accuracy. The minimum
input impedance is 18k
Ω for DC currents. During con-
version, the external reference must be able to deliver
up to 250A of DC load current and have an output
impedance of 10
Ω or less. The recommended mini-
mum value for the bypass capacitor is 0.1F. If the ref-
erence has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7F capacitor.
____________________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.
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 |
|---|---|
| MAX1240BMJA | 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 |
| MAX1240CC/D | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC +2.7V 12-Bit Serial ADC with Reference in SO-8 Package 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 |
| MAX1240CCPA | 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 |
| MAX1240CCPA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 73ksps 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 |
| MAX1240CCSA | 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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