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參數(shù)資料
| 型號： | MAX1292ACEG |
| 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)： | 9/20頁 |
| 文件大?。?/td> | 382K |
| 代理商： | MAX1292ACEG |
M
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________
9
_______________Detailed Description
Converter Operation
The MAX1290/MAX1292 ADCs use a successive-
approximation (SAR) conversion technique and an input
track-and-hold (T/H) stage to convert an analog input
signal to a 12-bit digital output. Their parallel (8 + 4) out-
put format provides an easy interface to standard micro-
processors (μPs). Figure 2 shows the simplified internal
architecture of the MAX1290/MAX1292.
Single-Ended and
Pseudo-Differential Operation
The sampling architecture of the ADC’s analog com-
parator is illustrated in the equivalent input circuits in
Figures 3a and 3b. In single-ended mode, IN+ is inter-
nally switched to channels CH0–CH7 for the MAX1290
(Figure 3a) and to CH0–CH3 for the MAX1292 (Figure
3b), while IN- is switched to COM (Table 3). In differen-
tial mode, IN+ and IN- are selected from analog input
pairs (Table 4).
In differential mode, IN- and IN+ are internally switched to
either of the analog inputs. This configuration is pseudo-
differential in that only the signal at IN+ is sampled. The
return side (IN-) must remain stable within ±0.5 LSB
(±0.1 LSB for best performance) with respect to GND
during a conversion. To accomplish this, connect a
0.1μF capacitor from IN- (the selected input) to GND.
During the acquisition interval, the channel selected as
the positive input (IN+) charges capacitor C
HOLD
. At
the end of the acquisition interval, the T/H switch
opens, retaining charge on C
HOLD
as a sample of the
signal at IN+.
The conversion interval begins with the input multiplex-
er switching C
HOLD
from the positive input (IN+) to the
negative input (IN-). This unbalances node ZERO at the
comparator’s positive input. The capacitive digital-to-
analog converter (DAC) adjusts during the remainder of
the conversion cycle to restore node ZERO to 0V within
the limits of 12-bit resolution. This action is equivalent to
transferring a 12pF [(V
IN+
) - (V
IN-
)] charge from C
HOLD
to the binary-weighted capacitive DAC, which in turn
forms a digital representation of the analog input signal.
T/H
THREE-STATE, BIDIRECTIONAL
I/O INTERFACE
12
17k
8
8
4
8
4
8
SUCCESSIVE-
APPROXIMATION
REGISTER
MUX
( ) ARE FOR MAX1290 ONLY.
CHARGE REDISTRIBUTION
12-BIT DAC
CLOCK
ANALOG
INPUT
MULTIPLEXER
CONTROL LOGIC
&
LATCHES
REF
REFADJ
1.22V
REFERENCE
D0
–
D7
8-BIT DATA BUS
(CH5)
(CH4)
CH3
CH2
CH1
CH0
COM
CLK
CS
WR
RD
INT
V
DD
V
LOGIC
HBEN
GND
MAX1290
MAX1292
A
=
2.05
COMP
(CH7)
(CH6)
Figure 2. Simplified Functional Diagram of 8-/4-Channel MAX1290/MAX1292
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參數(shù)描述 |
|---|---|
| MAX1292ACEG+ | 功能描述:模數(shù)轉(zhuǎn)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(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 |
| MAX1292ACEG+T | 功能描述:模數(shù)轉(zhuǎn)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(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 |
| MAX1292ACEG-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 |
| MAX1292AEEG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) 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 |
| MAX1292AEEG+ | 功能描述:模數(shù)轉(zhuǎn)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(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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