參數(shù)資料
型號(hào)： MAX1280BEUP
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(yè)數(shù)： 15/24頁(yè)
文件大小： 363K
代理商： MAX1280BEUP
M
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
______________________________________________________________________________________
15
Serial Clock
The external serial clock not only shifts data in and out,
but also drives the analog-to-digital conversion steps.
SSTRB pulses high for one clock period after the last bit
of the control byte. Successive-approximation bit deci-
sions are made and appear at DOUT on each of the next
12 SCLK falling edges (Figure 6). SSTRB and DOUT go
into a high-impedance state when
CS
goes high; after
the next
CS
rising edge, SSTRB outputs a logic low.
Figure 7 shows the detailed serial-interface timing.
The conversion must complete in 120μs or less, or
droop on the sample-and-hold capacitors may degrade
conversion results.
Data Framing
The falling edge of
CS
does
not
start a conversion. The
first logic high clocked into DIN is interpreted as a start
bit and defines the first bit of the control byte. A conver-
sion starts on SCLK’s falling edge after the eighth bit of
the control byte (the PD0 bit) is clocked into DIN. The
start bit is defined as follows:
The first high bit clocked into DIN with
CS
low any
time the converter is idle, e.g., after V
DD1
and V
DD2
are applied.
OR
The first high bit clocked into DIN after bit 6 of a con-
version in progress is clocked onto the DOUT pin.
Once a start bit has been recognized, the current con-
version may only be terminated by pulling
SHDN
low.
The fastest the MAX1280/MAX1281 can run with
CS
held low between conversions is 16 clocks per conver-
sion. Figure 8 shows the serial-interface timing neces-
sary to perform a conversion every 16 SCLK cycles. If
CS
is tied low and SCLK is continuous, guarantee a
start bit by first clocking in 16 zeros.
Applications Information
Power-On Reset
When power is first applied, and if
SHDN
is not pulled
low, internal power-on reset circuitry activates the
MAX1280/MAX1281 in normal operating mode, ready to
convert with SSTRB = low. The MAX1280/MAX1281
require 10μs to reset after the power supplies stabilize;
no conversions should be initiated during this time. If
CS
is low, the first logic 1 on DIN is interpreted as a
start bit. Until a conversion takes place, DOUT shifts out
zeros. Additionally, wait for the reference to stabilize
when using the internal reference.
Power Modes
You can save power by placing the converter in one of
the two low-current operating modes or in full power-
down between conversions. Select the power mode
through bit 1 and bit 0 of the DIN control byte (Tables 1
and 4), or force the converter into hardware shutdown
by driving
SHDN
to GND.
The software power-down modes take effect after the
conversion is completed;
SHDN
overrides any software
power mode and immediately stops any conversion in
SCLK
DIN
DOUT
SSTRB
t
CSS
t
CSO
t
CH
t
CL
t
DH
t
DS
t
DOE
t
STE
t
CSW
t
CP
t
CSH
t
CS1
t
STD
t
DOD
t
DOV
t
DOH
t
STV
t
STH
CS
Figure 7. Detailed Serial-Interface Timing
相關(guān)PDF資料
PDF描述
MAX1281BCUP 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
MAX1280BEUP+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 400ksps 5.5V 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
MAX1280BEUP+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 400ksps 5.5V 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
MAX1280BEUP-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
MAX1280EVC16 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 MAX1280 Eval System RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
MAX1280EVKIT 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 MAX1280 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
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