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參數(shù)資料
| 型號： | MAX1292BCEG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | 0.150 INCH, QSOP-28 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 382K |
| 代理商： | MAX1292BCEG |
Analog Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and GND, allow each input channel to
swing within (GND - 300mV) to (V
DD
+ 300mV) without
damage. However, for accurate conversions near full
scale, both inputs must not exceed (V
DD
+ 50mV) or be
less than (GND - 50mV).
If an off-channel analog input voltage exceeds the sup-
plies by more than 50mV, limit the forward-bias input
current to 4mA.
Track/Hold
The MAX1290/MAX1292 T/H stage enters its tracking
mode on the rising edge of
WR
. In external acquisition
mode, the part enters its hold mode on the next rising
edge of
WR
. In internal acquisition mode, the part enters
its hold mode on the fourth falling edge of clock after
writing the control byte. Note that, in internal clock mode,
this is approximately 1μs after writing the control byte.
In single-ended operation, IN- is connected to COM
and the converter samples the positive “+” input. In
pseudo-differential operation, IN- connects to the nega-
tive input “-” and the difference of
|
(IN+) - (IN-)
|
is sam-
pled. At the beginning of the next conversion, the
positive input connects back to IN+ and C
HOLD
charges to the input signal.
The time required for the T/H stage to acquire an input
signal depends on how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens and more time must be
allowed between conversions. The acquisition time,
t
ACQ
, is the maximum time the device takes to acquire
the signal and is also the minimum time required for the
signal to be acquired. Calculate this with the following
equation:
t
ACQ
= 9 (R
S
+ R
IN
)C
IN
where R
S
is the source impedance of the input signal,
R
IN
(800
) is the input resistance, and C
IN
(12pF) is
the input capacitance of the ADC. Source impedances
below 3k
have no significant impact on the MAX1290/
MAX1292’s AC performance.
Higher source impedances can be used if a 0.01μF
capacitor is connected to the individual analog inputs.
Along with the input impedance, this capacitor forms
an RC filter, limiting the ADC’s signal bandwidth.
Input Bandwidth
The MAX1290/MAX1292 T/H stage offers a 350kHz full-
linear and a 6MHz full-power bandwidth that make it
possible to digitize high-speed transients and measure
periodic signals with bandwidths exceeding the ADC’s
sampling rate by using undersampling techniques. To
avoid aliasing high-frequency signals into the frequen-
cy band of interest, anti-alias filtering is recommended.
Starting a Conversion
Initiate a conversion by writing a control byte that
selects the multiplexer channel and configures the
MAX1290/MAX1292 for either unipolar or bipolar opera-
tion. A write pulse (
WR
+
CS
) can either start an acqui-
sition interval or initiate a combined acquisition plus
M
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
10
______________________________________________________________________________________
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
C
SWITCH
TRACK
T/H
SWITCH
R
IN
800
C
HOLD
HOLD
12-BIT CAPACITIVE DAC
REF
ZERO
COMPARATOR
–
+
12pF
SINGLE-ENDED MODE: IN+ = CH0
–
CH7, IN- = COM
PSEUDO-DIFFERENTIAL MODE: IN+ AND IN- SELECTED FROM PAIRS OF
CH0/CH1, CH2/CH3, CH4/CH5, AND CH6/CH7
AT THE SAMPLING INSTANT,
THE MUX INPUT SWITCHES
FROM THE SELECTED IN+
CHANNEL TO THE SELECTED
IN- CHANNEL.
INPUT
MUX
Figure 3a. MAX1290 Simplified Input Structure
CH0
CH1
CH2
CH3
COM
C
SWITCH
TRACK
T/H
SWITCH
R
IN
800
C
HOLD
HOLD
12-BIT CAPACITIVE DAC
REF
ZERO
COMPARATOR
–
+
12pF
SINGLE-ENDED MODE: IN+ = CH0
–
CH3, IN- = COM
PSEUDO-DIFFERENTIAL MODE: IN+ AND IN- SELECTED FROM PAIRS OF
CH0/CH1 AND CH2/CH3
AT THE SAMPLING INSTANT,
THE MUX INPUT SWITCHES
FROM THE SELECTED IN+
CHANNEL TO THE SELECTED
IN- CHANNEL.
INPUT
MUX
Figure 3b. MAX1292 Simplified Input Structure
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1292BCEG+ | 功能描述:模數(shù)轉換器 - ADC 12-Bit 4Ch 400ksps 5.5V Precision 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 |
| MAX1292BCEG+T | 功能描述:模數(shù)轉換器 - ADC 12-Bit 4Ch 400ksps 5.5V Precision 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 |
| MAX1292BCEG-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 |
| MAX1292BEEG | 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 |
| MAX1292BEEG+ | 功能描述:模數(shù)轉換器 - ADC 12-Bit 4Ch 400ksps 5.5V Precision 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 |
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