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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： | 7/12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
_______________________________________________________________________________________
7
AIN
TRACKINPUT
HOLD
GND
TRACK
HOLD
9k
R
IN
C
HOLD
16pF
-
+
C
SWITCH
COMPARATOR
ZERO
REF
CAPACITIVE DAC
AT THE SAMPLING INSTANT,
THE INPUT SWITCHES FROM
AIN TOGND.
SHUTDOWN
INPUT
ANALOG INPUT
0V TOV
REF
+2.7V to +5.25V
1
2
3
4
V
DD
AIN
SHDN
REF
8
7
6
5
SCLK
CS
DOUT
GND
SERIAL
INTERFACE
C*
*4.7
μ
F, MAX1242
0.1
μ
F, MAX1243
4.7
μ
F 0.1
μ
F
REFERENCE
INPUT
MAX1243
MAX1242
MAX1243
Figure 3. Operational Diagram
Figure 4. Equivalent Input Circuit
where R
IN
= 9k
, R
S
= the input signal’s source imped-
ance, and t
ACQ
is never less than 1.5μs. Source imped-
ances below 4k
do not significantly affect the ADC’s
AC performance.
Higher source impedances can be used if a 0.01μF
capacitor is connected to the analog input. Note that
the input capacitor forms an RC filter with the input
source impedance, limiting the ADC’s input signal
bandwidth.
Input Bandwidth
The ADC’s input tracking circuitry has a 2.25MHz
small-signal bandwidth, so it is possible to digitize
high-speed transient events and measure periodic sig-
nals 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 recom-
mended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and GND, allow the input to swing from
GND - 0.3V to V
DD
+ 0.3V without damage. However,
for accurate conversions near full scale, the input must
not exceed V
DD
by more than 50mV, or be lower than
GND by 50mV.
If the analog input exceeds 50mV beyond the supplies,
limit the input current to 2mA.
Internal Reference (MAX1242)
The MAX1242 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
400μA. Bypass REF with a 4.7μF capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see Using
SHDN
to Reduce Supply Current.
The internal reference is enabled by pulling the
SHDN
pin high. Letting
SHDN
float disables the internal refer-
ence, which allows the use of an external reference, as
described in the External Reference section.
External Reference
The MAX1242/MAX1243 operate with an external refer-
ence at the REF pin. To use the MAX1242 with an
external reference, disable the internal reference by let-
ting
SHDN
float. Stay within the voltage range 1.0V to
V
DD
to achieve specified accuracy. The minimum input
impedance is 18k
for DC currents. During conver-
sion, the external reference must be able to deliver up
to 250μA of DC load current and have an output
impedance of 10
or less. The recommended mini-
mum value for the bypass capacitor is 0.1μF. If the ref-
erence has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7μF capacitor.
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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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