參數(shù)資料
型號： MAX147BEAP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： +2.7Low-Power, 8-Channel, Serial 12-Bit ADCs
中文描述： 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝： SSOP-20
文件頁數(shù)： 19/24頁
文件大?。?/td> 198K
代理商： MAX147BEAP
M
+2.7V, Low-Power, 8-Channel,
S erial 12-Bit ADCs
______________________________________________________________________________________
19
Lowest Power at Higher Throughputs
Figure 14b shows the power consumption with
external-reference compensation in fast power-down,
with one and eight channels converted. The external
4.7μF compensation requires a 200μs wait after
power-up with one dummy conversion. This graph
shows fast multi-channel conversion with the lowest
power consumption possible. Full power-down mode
may provide increased power savings in applications
where the MAX146/MAX147 are inactive for long peri-
ods of time, but where intermittent bursts of high-speed
conversions are required.
Internal and External Referenc es
The MAX146 can be used with an internal or external
reference voltage, whereas an external reference is
required for the MAX147. An external reference can be
connected directly at VREF or at the REFADJ pin.
An internal buffer is designed to provide 2.5V at
VREF for both the MAX146 and the MAX147. The
MAX146’s internally trimmed 1.21V reference is buf-
fered with a 2.06 gain. The MAX147’s REFADJ pin is
also buffered with a 2.00 gain to scale an external 1.25V
reference at REFADJ to 2.5V at VREF.
Internal Reference (MAX146)
The MAX146’s full-scale range with the internal refer-
ence is 2.5V with unipolar inputs and ±1.25V with bipo-
lar inputs. The internal reference voltage is adjustable
to ±1.5% with the circuit in Figure 16.
External Reference
With both the MAX146 and MAX147, an external refer-
ence can be placed at either the input (REFADJ ) or the
output (VREF) of the internal reference-buffer amplifier.
The REFADJ input impedance is typically 20k
for the
MAX146, and higher than 100k
for the MAX147. At
1
0 0
DIN
REFADJ
VREF
1.21V
0V
2.50V
0V
1
01
1
1
1
1
00
1
01
FULLPD
FASTPD
NOPD
FULLPD
FASTPD
9ms WAIT
COMPLETE CONVERSION SEQUENCE
t
BUFFEN
≈
200
μ
s
τ
= RC = 20k
x C
REFADJ
(ZEROS)
CH1
CH7
(ZEROS)
Figure 15. MAX146 FULLPD/FASTPD Power-Up Sequence
+3.3V
510k
24k
100k
0.047μF
12
REFADJ
MAX146
Figure 16. MAX146 Reference-Adjust Circuit
PD1
PD0
DEVICE MODE
0
0
Full Power-Down
0
1
Fast Power-Down
1
1
0
1
Internal Clock
External Clock
Table 5. Software Power-Down and
Clock Mode
Table 6. Hard-Wired Power-Down and
Internal Clock Frequency
SHDN
STATE
DEVICE
MODE
REFERENCE
BUFFER
COMPENSATION
INTERNAL
CLOCK
FREQUENCY
1
Enabled
Enabled
Power-Down
Internal
External
N/A
225kHz
1.8MHz
N/A
Floating
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX147BEAP+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 133ksps 5.25V 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
MAX147BEAP+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 133ksps 5.25V 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
MAX147BEAP-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
MAX147BEPP 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
MAX147BEPP+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 133ksps 5.25V 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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