參數(shù)資料
型號(hào)： MAX1280EVKIT
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： MAX1280 Evaluation System
中文描述： MAX1280評(píng)估板/評(píng)估系統(tǒng)
文件頁(yè)數(shù)： 13/24頁(yè)
文件大小： 363K
代理商： MAX1280EVKIT
M
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
______________________________________________________________________________________
13
high for one clock period before the MSB of the 12-bit
conversion result is shifted out of DOUT. Varying the
analog input to CH7 will alter the sequence of bits from
DOUT. A total of 16 clock cycles is required per con-
version. All transitions of the SSTRB and DOUT outputs
typically occur 20ns after the rising edge of SCLK.
Starting a Conversion
Start a conversion by clocking a control byte into DIN.
With
CS
low, each rising edge on SCLK clocks a bit from
DIN into the MAX1280/MAX1281’s internal shift register.
After
CS
falls, the first arriving logic “1” bit defines the
control byte’s MSB. Until this first “start” bit arrives, any
number of logic “0” bits can be clocked into DIN with no
effect. Table 1 shows the control-byte format.
The MAX1280/MAX1281 are compatible with SPI/QSPI
and MICROWIRE devices. For SPI, select the correct
clock polarity and sampling edge in the SPI control reg-
isters: set CPOL = 0 and CPHA = 0. MICROWIRE, SPI,
and QSPI all transmit a byte and receive a byte at the
same time. Using the
Typical Operating Circuit
, the
simplest software interface requires only three 8-bit
transfers to perform a conversion (one 8-bit transfer to
configure the ADC, and two more 8-bit transfers to
clock out the 12-bit conversion result). See Figure 17
for MAX1280/MAX1281 QSPI connections.
Simple Software Interface
Make sure the CPU’s serial interface runs in master
mode, so the CPU generates the serial clock. Choose a
clock frequency from 500kHz to 6.4MHz (MAX1280) or
4.8MHz (MAX1281).
1) Set up the control byte and call it TB1. TB1 should
be of the format 1XXXXXXX binary, where the Xs
denote the particular channel, selected conversion
mode, and power mode.
2) Use a general-purpose I/O line on the CPU to pull
CS
low.
3) Transmit TB1 and, simultaneously, receive a byte
and call it RB1. Ignore RB1.
4) Transmit a byte of all zeros ($00 hex) and, simultane-
ously, receive byte RB2.
5) Transmit a byte of all zeros ($00 hex) and, simultane-
ously, receive byte RB3.
6) Pull
CS
high.
Figure 6 shows the timing for this sequence. Bytes RB2
and RB3 contain the result of the conversion, padded
with three leading zeros and one trailing zero. The total
conversion time is a function of the serial-clock fre-
quency and the amount of idle time between 8-bit
transfers. To avoid excessive T/H droop, make sure the
total conversion time does not exceed 120μs.
Digital Output
In unipolar input mode, the output is straight binary
(Figure 14). For bipolar input mode, the output is two’s
complement (Figure 15). Data is clocked out on the ris-
ing edge of SCLK in MSB-first format.
1
8
4
9
12
16
24
20
DIN
t
ACQ
SEL
2
SEL
1
SEL
0
UNI/
BIP
PD1 PD0
RB1
SCLK
START
SSTRB
HIGH-Z
DOUT
CS
B6
B8
B7
B9
B10
B11
B1
B0
B2
B3
B5
B4
RB2
CONVERSION
IDLE
IDLE
ACQUISITION
RB3
SGL/
DIF
HIGH-Z
HIGH-Z
HIGH-Z
Figure 6. Single-Conversion Timing
相關(guān)PDF資料
PDF描述
MAX1281 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1280BEUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1281BCUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1281BEUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1283BCUE 300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
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 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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+ 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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