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参数资料
| 型号： | MAX1293AEEG |
| 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： | 15/20页 |
| 文件大小： | 224K |
| 代理商： | MAX1293AEEG |
M
250ksps, +3V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
______________________________________________________________________________________
15
Table 4. Channel Selection for Pseudo-Differential Operation (SGL/
DIF
= 0)
*Channels CH4–CH7 apply to MAX1291 only.
A1
0
0
1
1
0
0
1
1
CH0
+
-
0
1
0
1
0
1
0
1
-
+
0
0
0
0
1
1
1
1
A0
CH2
CH4*
+
-
-
+
CH3
CH1
CH7*
CH6*
CH5*
A2
+
-
-
+
-
+
+
-
__________Applications Information
Power-On Reset
When power is first applied, internal power-on reset cir-
cuitry activates the MAX1291/MAX1293 in external
clock mode and sets
INT
high. After the power supplies
stabilize, the internal reset time is 10μs, and no conver-
sions should be attempted during this phase. When
using the internal reference, 500μs is required for V
REF
to stabilize.
Internal and External Reference
The MAX1291/MAX1293 can be used with an internal
or external reference voltage. An external reference
can be connected directly to REF or REFADJ.
An internal buffer is designed to provide +2.5V at REF for
the both the MAX1291 and the MAX1293. The internally
trimmed +1.22V reference is buffered with a +2.05V/V
gain.
Internal Reference
With the internal reference, the full-scale range is +2.5V
with unipolar inputs and ±1.25V with bipolar inputs. The
internal reference buffer allows for small adjustments
(±100mV) in the reference voltage. See Figure 7.
Note that the reference buffer must be compensated
with an external capacitor (4.7μF min) connected
between REF and GND to reduce reference noise and
switching spikes from the ADC. To further minimize
noise on the reference, connect a 0.01μF capacitor
between REFADJ and GND.
External Reference
With both the MAX1291 and MAX1293, an external ref-
erence can be placed at either the input (REFADJ) or
the output (REF) of the internal reference buffer amplifier.
Using the REFADJ input makes buffering the external
reference unnecessary. The REFADJ input impedance
is typically 17k
.
Table 5. Data-Bus Output (8+4 Parallel
Interface)
HBEN = 0
B0 (LSB)
D0
BIPOLAR
(UNI/
BIP
= 0)
UNIPOLAR
(UNI/
BIP
= 1)
0
0
0
0
D4
B11
B11
B4
D6
D7
B11
B7
B11
B6
D5
B5
D2
D3
B11 (MSB)
B3
B10
B2
D1
B9
B1
HBEN = 1
B8
PIN
+3V
330k
50k
GND
GND
50k
0.01μF
4.7μF
REFADJ
REF
MAX1291
MAX1293
Figure 7. Reference Voltage Adjustment with External
Potentiometer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1293AEEG+ | 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 |
| MAX1293AEEG+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 |
| MAX1293AEEG-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 |
| MAX1293BCEG | 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 |
| MAX1293BCEG+ | 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 |
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