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参数资料
| 型号： | MAX1242BMJA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | +2.7V to %.25V, Low-Power, 10-Bit Serial ADCs in SO-8 |
| 中文描述： | 1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP8 |
| 封装： | CERDIP-8 |
| 文件页数： | 8/12页 |
| 文件大小： | 158K |
| 代理商： | MAX1242BMJA |
M
+2.7V to +5.25V, Low-Power, 10-Bit
S erial ADCs in S O-8
8
_______________________________________________________________________________________
S erial Interfac e
Initialization after Power-Up and
S tarting a Conversion
When power is first applied, and if
SHDN
is not pulled
low, it takes the fully discharged 4.7μF reference
bypass capacitor up to 20ms to provide adequate
charge for specified accuracy. With an external refer-
ence, the internal reset time is 10μs 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
SHDN
to Reduc e S upply 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, t
WAKE
, 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 4.7μF 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 4μs.
10,000
100
1000
1
0.1
1
10
100
1k
10k
100k
10
CONVERSIONS/SEC
S
μ
A
V
DD =
V
REF
R
LOAD
=
∞
, C
LOAD
= 50pF
CODE = 0101010100
M
MAX1242
V
DD
= 3V
MAX1242
V
DD
= 5V
MAX1243
V
DD
= 3V
Figure 6. Average Supply Current vs. Conversion Rate
1.0
0.0
0.001
0.01
TIME IN SHUTDOWN
(sec)
0.1
1
10
0.8
0.6
0.4
0.2
P
M
Figure 7. Typical Reference-Buffer Power-Up Delay vs. Time in
Shutdown
COMPLETE CONVERSION SEQUENCE
t
WAKE
POWERED UP
POWERED DOWN
POWERED UP
CONVERSION 0
CONVERSION 1
DOUT
CS
SHDN
Figure 5. Shutdown Sequence
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1242DCSA | 制造商:Maxim Integrated Products 功能描述: |
| MAX1243ACPA | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1243ACPA+ | 功能描述:模数转换器 - ADC 10-Bit 73ksps 5.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1243ACSA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1243ACSA+ | 功能描述:模数转换器 - ADC 10-Bit 73ksps 5.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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