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参数资料
| 型号： | MAX1285BCSA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封装： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件页数： | 10/15页 |
| 文件大小： | 210K |
| 代理商： | MAX1285BCSA |
M
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
10
______________________________________________________________________________________
Figure 5. Supply Current vs. Conversion Rate
To start a conversion, pull
CS
low. At
CS
’
s
falling edge,
the T/H enters its hold mode and a conversion is initiat-
ed. Data can then be shifted out serially with the exter-
nal clock.
Using
SHDN
to Reduce Supply Current
Power consumption can be reduced significantly by
shutting down the MAX1284/MAX1285 between con-
versions. Figure 5 shows a plot of average supply cur-
rent versus conversion rate. The wake-up time (t
WAKE
)
is the time from when
SHDN
is deasserted to the time
when a conversion may be initiated (Figure 6). This
time depends on the time in shutdown (Figure 7)
because the external 4.7μF reference bypass capacitor
loses charge slowly during shutdown and can be as
long as 2ms.
Timing and Control
Conversion-start and data-read operations are con-
trolled by the
CS
and SCLK digital inputs. The timing dia-
grams of Figures 8 and 9 outline serial-interface
operation.
A
CS
falling edge initiates a conversion sequence: the
T/H stage holds the input voltage, the ADC begins to
convert, and DOUT changes from high impedance to
logic low. SCLK is used to drive the conversion
process, and it shifts data out as each bit of conversion
is determined.
SCLK begins shifting out the data after the rising edge
of the third SCLK pulse. DOUT transitions 20ns after
each SCLK rising edge. The third rising clock edge
produces the MSB of the conversion at DOUT, followed
by the remaining bits. Since there are twelve data bits
and three leading zeros, at least fifteen rising clock
edges are needed to shift out these bits. Extra clock
pulses occurring after the conversion result has been
clocked out, and prior to a rising edge of
CS
, produce
trailing zeros at DOUT and have no effect on converter
operation.
Pull
CS
high after reading the conversion
’
s LSB. For
maximum throughout,
CS
can be pulled low again to
initiate the next conversion immediately after the speci-
fied minimum time (t
CS
).
Output Coding and Transfer Function
The data output from the MAX1284/MAX1285 is binary,
and Figure 10 depicts the nominal transfer function.
Code transitions occur halfway between successive-
integer LSB value V
REF
= +2.5V, and 1LSB = 610μV or
2.5V/4096.
COMPLETE CONVERSION SEQUENCE
CONVERSION 0
CONVERSION 1
POWERED-UP
POWERED-UP
POWERED-DOWN
t
WAKE
DOUT
CS
SHDN
Figure 6. Shutdown Sequence
0.1
1
100
10
1k
10k
0.1
10
1
100
1k
10k
100k
CONVERSION RATE (ksps)
S
μ
A
V
DD
= 3V
DOUT = FS
R
L
=
∞
C
L
= 10pF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1285BCSA+ | 功能描述:模数转换器 - ADC 12-Bit 300ksps 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 |
| MAX1285BCSA+T | 功能描述:模数转换器 - ADC 12-Bit 300ksps 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 |
| MAX1285BCSA-T | 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 |
| MAX1285BESA | 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 |
| MAX1285BESA+ | 功能描述:模数转换器 - ADC 12-Bit 300ksps 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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