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参数资料
| 型号： | MAX1293BEEG |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 250ksps, +3V, 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 |
| 封装： | 0.150 INCH, QSOP-24 |
| 文件页数： | 9/20页 |
| 文件大小： | 224K |
| 代理商： | MAX1293BEEG |
Detailed Description
Converter Operation
The MAX1291/MAX1293 ADCs use a successive-
approximation (SAR) conversion technique and an
input track/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
microprocessors (μPs). Figure 2 shows the simplified
internal architecture of the MAX1291/MAX1293.
Single-Ended and
Pseudo-Differential Operation
The sampling architecture of the ADC’s analog com-
parator is illustrated in the equivalent input circuit in
Figure 3. In single-ended mode, IN+ is internally
switched to channels CH0–CH7 for the MAX1291
(Figure 3a) and to CH0–CH3 for the MAX1293 (Figure
3b), while IN- is switched to COM (Table 3).
In differential mode IN+ and IN- are selected from ana-
log input pairs (Table 4) and are internally switched to
either of the analog inputs. This configuration is pseu-
do-differential in that only the signal at IN+ is sampled.
The return side (IN-) must remain stable within ±0.5LSB
(±0.1LSB 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.
M
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
_______________________________________________________________________________________
9
T/H
THREE-STATE, BIDIRECTIONAL
I/O INTERFACE
12
17k
8
8
4
8
4
8
SUCCESSIVE-
APPROXIMATION
REGISTER
MUX
CHARGE REDISTRIBUTION
12-BIT DAC
CLOCK
( ) ARE FOR MAX1291 ONLY.
ANALOG
INPUT
MULTIPLEXER
CONTROL LOGIC
&
LATCHES
REF
REFADJ
1.22V
REFERENCE
D0–D7
8-BIT DATA BUS
(CH5)
(CH4)
CH3
CH2
CH1
CH0
(CH7)
(CH6)
COM
CLK
CS
WR
RD
INT
V
DD
HBEN
GND
V
LOGIC
MAX1291
MAX1293
A
=
2.05
COMP
Figure 2. Simplified Internal Architecture for 8-/4-Channel MAX1291/MAX1293
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| MAX1291AEEI | 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
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| MAX1290ACEI | 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| MAX1290AEEI | 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| MAX1290BCEI | 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1293BEEG+ | 功能描述:模数转换器 - ADC 12-Bit 4Ch 250ksps 3.6V 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 |
| MAX1293BEEG+T | 功能描述:模数转换器 - ADC 12-Bit 4Ch 250ksps 3.6V 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 |
| MAX1293BEEG-T | 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 |
| MAX1294ACEI | 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 |
| MAX1294ACEI+ | 功能描述:模数转换器 - ADC 12-Bit 6Ch 420ksps 5.5V 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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