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參數(shù)資料
| 型號： | MAX1039 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2.7V to 5.5V, Low-Power, 4-/12-Channel 2-Wire Serial 8-Bit ADCs |
| 中文描述： | 2.7V至5.5V、低功耗、4/12通道、2線串口8位ADC |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 427K |
| 代理商： | MAX1039 |
M
2.7V to 5.5V, Low-Power, 4-/12-Channel
2-Wire Serial 8-Bit ADCs
______________________________________________________________________________________
19
External Reference
The external reference can range from 1.0V to V
DD
. For
maximum conversion accuracy, the reference must be
able to deliver up to 30μA and have an output imped-
ance of 1k
or less. If the reference has a higher output
impedance or is noisy, bypass it to GND as close to
AIN_/REF as possible with a 0.1μF capacitor.
Transfer Functions
Output data coding for the MAX1036
–
MAX1039 is binary
in unipolar mode and two
’
s complement binary in bipolar
mode with 1LSB = (V
REF
/2
N
) where N is the number of
bits (8). Code transitions occur halfway between succes-
sive-integer LSB values. Figures 12 and 13 show the
input/output (I/O) transfer functions for unipolar and bi-
polar operations, respectively.
Layout, Grounding, and Bypassing
For best performance, use PC boards. Wire-wrap config-
urations are not recommended since the layout should
ensure proper separation of analog and digital traces. Do
not run analog and digital lines parallel to each other, and
do not lay out digital signal paths underneath the ADC
package. Use separate analog and digital PC board
ground sections with only one star point (Figure 14) con-
necting the two ground systems (analog and digital). For
lowest noise operation, ensure the ground return to the
star ground
’
s power supply is low impedance and as
short as possible. Route digital signals far away from sen-
sitive analog and reference inputs.
High-frequency noise in the power supply (V
DD
) could
influence the proper operation of the ADC
’
s fast
comparator. Bypass V
DD
to the star ground with a
0.1μF capacitor located as close as possible to the
MAX1036
–
MAX1039 power-supply pin. Minimize
capacitor lead length for best supply-noise rejection,
and add an attenuation resistor (5
) if the power sup-
ply is extremely noisy.
Definitions
Integral Nonlinearity
Integral nonlinearity (INL) is the deviation of the values
on an actual transfer function from a straight line. This
straight line can be either a best-straight-line fit or a line
drawn between the endpoints of the transfer function,
once offset and gain errors have been nullified. The INL
is measured using the endpoint method.
SCAN1
0
0
SCAN0
0
1
SCANNING CONFIGURATION
Scans up from AIN0 to the input selected by CS3
–
CS0 (default setting).
Converts the input selected by CS3
–
CS0 eight times.*
Scans up from AIN2 to the input selected by CS1 and CS0. When CS1 and CS0 are set for
AIN0
–
AIN2, the scanning stops at AIN2 (MAX1036/MAX1037).
1
0
Scans up from AIN6 to the input selected by CS3
–
CS0. When CS3
–
CS0 is set for AIN0
–
AIN6
scanning stops at AIN6 (MAX1038/MAX1039).
1
1
Converts the channel selected by CS3
–
CS0.*
Table 5. Scanning Configuration
*
When operating in external clock mode, there is no difference between SCAN[1:0] = 01 and SCAN[1:0] = 11 and converting continues
until a not acknowledge occurs.
SEL2
SEL1
SEL0
REFERENCE VOLTAGE
AIN_/REF
INTERNAL REFERENCE
STATE
0
0
1
1
1
0
1
0
0
1
X
X
0
1
X
V
DD
External reference
Internal reference
Internal reference
Internal reference
Analog input
Reference input
Analog input
Analog input
Reference output
Always Off
Always Off
Auto Shutdown
Always On
Always On
Table 6. Reference Voltage and AIN_/REF Format
X = Don
’
t care.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1039AEEE | 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 |
| MAX1039AEEE+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.3V 12-Bit 4Ch I2C Serial 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 |
| MAX1039AEEE+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.3V 12-Bit 4Ch I2C Serial 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 |
| MAX1039AEEE-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 |
| MAX1039KAEEE | 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 |
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