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参数资料
| 型号： | MAX1295ACEI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
| 中文描述： | 6-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | 0.150 INCH, QSOP-28 |
| 文件页数： | 12/20页 |
| 文件大小： | 228K |
| 代理商： | MAX1295ACEI |
M
265ksps, +3V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
12
______________________________________________________________________________________
External Acquisition
Use external acquisition mode for precise control of the
sampling aperture and/or dependent control of acquisi-
tion and conversion times. The user controls acquisition
and start-of-conversion with two separate write pulses.
The first pulse, written with ACQMOD = 1, starts an
acquisition interval of indeterminate length. The second
write pulse, written with ACQMOD = 0 (all other bits in
control byte unchanged), terminates acquisition and
starts conversion on
WR
rising edge (Figure 5).
The address bits for the input multiplexer must have the
same values on the first and second write pulse.
Power-down mode bits (PD0, PD1) can assume new
values on the second write pulse (see Power-Down
Modes section). Changing other bits in the control byte
will corrupt the conversion.
Reading a Conversion
A standard interrupt signal
INT
is provided to allow the
MAX1295/MAX1297 to flag the μP when the conversion
has ended and a valid result is available.
INT
goes low
when the conversion is complete and the output data is
ready (Figures 4, 5). It returns high on the first read
cycle or if a new control byte is written.
Selecting Clock Mode
The MAX1295/MAX1297 operate with either an internal
or an external clock. Control bits D6 and D7 select
either internal or external clock mode. The part retains
the last requested clock mode if a power-down mode is
selected in the current input word. For both internal and
external clock mode, internal or external acquisition
can be used. At power-up, the MAX1295/MAX1297
enter the default external clock mode.
Internal Clock Mode
Select internal clock mode to release the μP from the
burden of running the SAR conversion clock. Bits D6
and D7 of the control byte must be set to 1; the internal
clock frequency is then selected, resulting in a conver-
sion time of 3.6μs. When using the internal clock mode,
tie the CLK pin either high or low to prevent the pin
from floating.
t
CS
t
CSWS
t
WR
t
ACQ
t
CONV
t
DH
t
DS
t
INT1
t
D0
t
TR
t
CSWH
ACQMOD = "1"
CS
WR
D11–D0
INT
RD
DOUT
ACQMOD = "0"
VALID DATA
CONTROL
BYTE
CONTROL
BYTE
HIGH-Z
HIGH-Z
Figure 5. Conversion Timing Using External Acquisition Mode
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| MAX1295BCEI | 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1295ACEI+ | 功能描述:模数转换器 - ADC 12-Bit 6Ch 265ksps 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 |
| MAX1295ACEI+T | 功能描述:模数转换器 - ADC 12-Bit 6Ch 265ksps 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 |
| MAX1295ACEI-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 |
| MAX1295AEEI | 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 |
| MAX1295AEEI+ | 功能描述:模数转换器 - ADC 12-Bit 6Ch 265ksps 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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