參數(shù)資料
型號： MAX1031BEGI-T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 10-Bit 300ksps ADCs with FIFO,Temp Sensor, Internal Reference
中文描述： 16-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQCC28
封裝： 5 X 5 MM, 0.90 MM HEIGHT, EXPOSED PAD, QFN-28
文件頁數(shù)： 11/24頁
文件大小： 470K
代理商： MAX1031BEGI-T
M
10-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
______________________________________________________________________________________
11
In differential mode, the T/H samples the difference
between two analog inputs, eliminating common-mode
DC offsets and noise. IN+ and IN- are selected from
the following pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5,
AIN6/AIN7, AIN8/AIN9, AIN10/AIN11, AIN12/AIN13,
and AIN14/AIN15. AIN0
–
AIN7 are available on the
MAX1027, MAX1029, and MAX1031. AIN8
–
AIN11 are
only available on the MAX1029 and MAX1031.
AIN12
–
AIN15 are only available on the MAX1031. See
Tables 2
–
5 for more details on configuring the inputs.
For the inputs that can be configured as
CNVST
or an
analog input, only one can be used at a time. For the
inputs that can be configured as REF- or an analog
input, the REF- configuration excludes the analog input.
Unipolar/Bipolar
Address the unipolar and bipolar registers through the
setup register (bits 1 and 0). Program a pair of analog
channels for differential operation by writing a 1 to the
appropriate bit of the bipolar or unipolar register.
Unipolar mode sets the differential input range from 0
to V
REF
. A negative differential analog input in unipolar
mode causes the digital output code to be zero.
Selecting bipolar mode sets the differential input range
to ±V
REF
/ 2. The digital output code is binary in unipo-
lar mode and two
’
s complement in bipolar mode (see
the transfer function graphs, Figures 8 and 9).
In single-ended mode, the MAX1027/MAX1029/
MAX1031 always operate in unipolar mode. The analog
inputs are internally referenced to GND with a full-scale
input range from 0 to V
REF
.
True Differential Analog Input T/H
The equivalent circuit of Figure 3 shows the
MAX1027/MAX1029/MAX1031s
’
input architecture. In
track mode, a positive input capacitor is connected to
AIN0
–
AIN15 in single-ended mode (and AIN0, AIN2,
AIN4
…
AIN14 in differential mode). A negative input
capacitor is connected to GND in single-ended mode
(or AIN1, AIN3, AIN5
…
AIN15 in differential mode). For
external track-and-hold timing, use clock mode 01.
After the T/H enters hold mode, the difference between
the sampled positive and negative input voltages is
converted. The time required for the T/H to acquire an
input signal is determined by how quickly its input
capacitance is charged. If the input signal
’
s source
impedance is high, the required acquisition time
lengthens. The acquisition time, t
ACQ
, is the maximum
time needed for a signal to be acquired, plus the power-
up time. It is calculated by the following equation:
where R
IN
= 1.5k
, R
S
is the source impedance of the
input signal, and t
PWR
= 1μs, the power-up time of the
device. The varying power-up times are detailed in the
explanation of the clock mode conversions.
t
ACQ
is never less than 1.4μs, and any source imped-
ance below 300
does not significantly affect the
ADC
’
s AC performance. A high-impedance source can
be accommodated either by lengthening t
ACQ
or by
placing a 1μF capacitor between the positive and neg-
ative analog inputs.
Internal FIFO
The MAX1027/MAX1029/MAX1031 contain a FIFO
buffer that can hold up to 16 ADC results plus one tem-
perature result. This allows the ADC to handle multiple
internally clocked conversions and a temperature mea-
surement, without tying up the serial bus.
If the FIFO is filled and further conversions are request-
ed without reading from the FIFO, the oldest ADC
results are overwritten by the new ADC results. Each
result contains 2 bytes, with the MSB preceded by four
leading zeros and the LSB followed by two sub-bits.
After each falling edge of
CS
, the oldest available byte
of data is available at DOUT, MSB first. When the FIFO
is empty, DOUT is zero.
The first 2 bytes of data read out after a temperature
measurement always contain the temperature result
preceded by four leading zeros, MSB first. If another
t
x R
R
x
pF
t
AQC
S
IN
PWR
9
+
=
)
+
24
+
-
HOLD
CIN+
REF
GND
DAC
CIN-
V
DD
/2
COMPARATOR
AIN0-AIN15
(SINGLE ENDED);
AIN0, AIN2,
AIN4…AIN14
(DIFFERENTIAL)
GND
(SINGLE ENDED);
AIN1, AIN3,
AIN5…AIN15
(DIFFERENTIAL)
HOLD
HOLD
Figure 3. Equivalent Input Circuit
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相關代理商/技術參數(shù)
參數(shù)描述
MAX1031BETI 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1031BETI+ 功能描述:模數(shù)轉換器 - ADC 10Bit 300ksps w/FIFO Temp Sensor Int Ref RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1031BETI+T 功能描述:模數(shù)轉換器 - ADC 10Bit 300ksps w/FIFO Temp Sensor Int Ref RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1031BETI-T 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1032 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:8-/4-Channel, 【12V Multirange Inputs, Serial 14-Bit ADCs
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