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參數(shù)資料
| 型號(hào)： | MAX1281BCUP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | 4.40 MM, 0.65 MM PITCH, MO-153AD, TSSOP-20 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大小： | 363K |
| 代理商： | MAX1281BCUP |
M
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
______________________________________________________________________________________
17
Table 4 details the four power modes with the corre-
sponding supply current and operating sections. For
data rates achievable in software power-down modes,
see
Power-Down
Sequencing.
Hardware Power-Down
Pulling
SHDN
low places the converter in hardware
power-down. Unlike software power-down mode, the
conversion is terminated immediately. When returning
to normal operation from
SHDN
with an external refer-
ence, the MAX1280/MAX1281 can be considered fully
powered-up within 2μs of actively pulling
SHDN
high.
When using the internal reference, the conversion
should be initiated only after the reference has settled;
its recovery time depends on the external bypass
capacitors and shutdown duration.
Power-Down Sequencing
The MAX1280/MAX1281’s automatic power-down
modes can save considerable power when operating at
less than maximum sample rates. Figures 10 and 11
show the average supply current as a function of the
sampling rate.
Using Full Power-Down Mode
Full power-down mode (FULLPD) achieves the lowest
power consumption at up to 1000 conversions per
channel per second. Figure 10a shows the MAX1281’s
power consumption for 1- or 8-channel conversions
using full power-down mode (PD1 = PD0 = 0), with the
internal reference and the maximum clock speed. A
0.01μF bypass capacitor plus the internal 17k
refer-
ence resistor at REFADJ forms an RC filter with a 200μs
time constant. To achieve full 12-bit accuracy, 10 time
constants or 2ms are required after power-up if the
bypass capacitor is fully discharged between conver-
sions. Waiting this 2ms in FASTPD mode or reduced-
power mode (REDP) instead of full power-down mode
can further reduce power consumption. This is
achieved by using the sequence shown in Figure 12a.
Figure 10b shows the MAX1281’s power consumption
for 1- or 8-channel conversions using FULLPD mode
(PD1 = PD0 = 0), an external reference, and the maxi-
mum clock speed. One dummy conversion to power-up
the device is needed, but no wait-time is necessary to
start the second conversion, thereby achieving lower
power consumption at up to the full sampling rate.
Using Fast Power-Down and
Reduced-Power Modes
FASTPD and REDP modes achieve the lowest power
consumption at speeds close to the maximum sample
rate. Figure 11 shows the MAX1281’s power consump-
tion in FASTPD mode (PD1 = 0, PD0 = 1), REDP mode
(PD1 = 1, PD0 = 0), and (for comparison) normal
operating mode (PD = 1, PD0 = 1). The figure shows
0
0.0001
0.50
0.25
1.00
0.75
1.25
1.50
0.01
0.001
0.1
1
10
TIME IN SHUTDOWN (s)
R
MAX1281
V
DD1 =
V
DD2 =
3.0V
C
LOAD
= 20pF
CODE = 101010000000
1000
100
10
1
0.1
10
1
100
1k
10k
SAMPLING RATE (sps)
S
μ
A
8 CHANNELS
1 CHANNEL
10,000
1000
10
100
1
1
100
10
1k
10k
100k
SAMPLING RATE (sps)
S
μ
A
MAX1281
V
DD1
=
V
=
3.0V
C
LOAD
= 20pF
CODE = 101010000000
8 CHANNELS
1 CHANNEL
Figure 9. Reference Power-Up Delay vs. Time in Shutdown
Figure 10a. Average Supply Current vs. Sample Rate (Using
FULLPD and Internal Reference)
Figure 10b. Average Supply Current vs. Sampling Rate (Using
FULLPD and External Reference)
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| MAX1281BEUP | 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1281BCUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 300ksps 3.6V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1281BCUP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 300ksps 3.6V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1281BCUP-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1281BEUP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1281BEUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 300ksps 3.6V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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