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参数资料
| 型号： | MAX149BCPP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT SERIAL 20-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 18 |
| 位数： | 10 |
| 采样率（每秒）： | 133k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 889mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个差分，单极；4 个差分，双极 |
+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
17
Software Power-Down
Software power-down is activated using bits PD1 and
PD0 of the control byte. As shown in Table 5, PD1 and
PD0 also specify the clock mode. When software shut-
down is asserted, the ADC operates in the last specified
clock mode until the conversion is complete. Then the
ADC powers down into a low quiescent-current state.
In internal clock mode, the interface remains active
and conversion results may be clocked out after the
MAX148/MAX149 enter a software power-down.
The first logical 1 on DIN is interpreted as a start bit and
powers up the MAX148/MAX149. Following the start bit, the
data input word or control byte also determines clock mode
and power-down states. For example, if the DIN word con-
tains PD1 = 1, then the chip remains powered up. If PD0
= PD1 = 0, a power-down resumes after one conversion.
Hardware Power-Down
Pulling SHDN low places the converter in hardware pow-
er-down (Table 6). Unlike software power-down mode, the
conversion is not completed; it stops coincidentally with
SHDN being brought low. SHDN also controls the clock
frequency in internal clock mode. Leaving SHDN uncon-
nected sets the internal clock frequency to 1.8MHz. When
returning to normal operation with SHDN unconnected,
there is a tRC delay of approximately 2MI x CL, where CL
is the capacitive loading on the SHDN pin. Pulling SHDN
high sets internal clock frequency to 225kHz. This feature
eases the settling-time requirement for the reference volt-
age. With an external reference, the MAX148/MAX149
can be considered fully powered up within 2Fs of actively
pulling SHDN high.
Power-Down Sequencing
The MAX148/MAX149 auto power-down modes can
save considerable power when operating at less than
maximum sample rates. Figures 13, 14a, and 14b show
the average supply current as a function of the sampling
rate. The following discussion illustrates the various
power-down sequences.
Lowest Power at Up to 500
Conversions/Channel/Second
The following examples show two different power-down
sequences. Other combinations of clock rates, compen-
sation modes, and power-down modes may give lowest
power consumption in other applications.
Figure 14a depicts the MAX149 power consumption for
one or eight channel conversions utilizing full power-
down mode and internal-reference compensation. A
0.01FF bypass capacitor at REFADJ forms an RC filter
with the internal 20kI reference resistor with a 0.2ms
time constant. To achieve full 10-bit accuracy, 8 time
constants or 1.6ms are required after power-up. Waiting
this 1.6ms in FASTPD mode instead of in full power-up
can reduce power consumption by a factor of 10 or
more. This is achieved by using the sequence shown in
Figure 15.
Figure 14b. MAX149 Supply Current vs. Conversion Rate,
FASTPD
Figure 14c. Typical Reference-Buffer Power-Up Delay vs.
Time in Shutdown
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE (USING FASTPD)
MAX148/9-F14B
CONVERSION RATE (Hz)
AVERAGE
SUPPLY
CURRENT
(A)
100k
10k
1k
100
10
1
0
100
1000
10,000
1
0.1
1M
RLOAD = ∞
CODE = 1010101000
8 CHANNELS
1 CHANNEL
TYPICAL REFERENCE-BUFFER POWER-UP
DELAY vs. TIME IN SHUTDOWN
MAX148/9-F14C
TIME IN SHUTDOWN (s)
POWER-UP
DELAY
(ms)
1
0.1
0.01
0.5
1.0
1.5
2.0
0
0.001
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX149BCPP+ | 功能描述:模数转换器 - ADC 10-Bit 8Ch 133ksps 5.25V 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 |
| MAX149BEAP | 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 |
| MAX149BEAP+ | 功能描述:模数转换器 - ADC 10-Bit 8Ch 133ksps 5.25V 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 |
| MAX149BEAP+T | 功能描述:模数转换器 - ADC 10-Bit 8Ch 133ksps 5.25V 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 |
| MAX149BEAP-G071 | 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 |
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