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參數(shù)資料
| 型號： | MAX1108-MAX1109 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| 中文描述： | 單電源，低功耗，2通道，串行8位ADC |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 185K |
| 代理商： | MAX1108-MAX1109 |
M
S ingle-S upply, Low-Power,
2-Channel, S erial 8-Bit ADCs
12
______________________________________________________________________________________
The serial interface provides easy connection to micro-
controllers with SPI, QSPI and MICROWIRE serial inter-
faces at clock rates up to 2MHz. For SPI and QSPI, set
CPOL = CPHA = 0 in the SPI control registers of the
microcontroller. Figure 5 shows the MAX1108/MAX1109
common serial-interface connections.
Digital Inputs
The logic levels of the MAX1108/MAX1109 digital input
are set to accept voltage levels from both +3V and +5V
systems, regardless of the supply voltages. Input data
(control byte) is clocked in at the DIN pin on the rising
edge of serial clock (SCLK).
CS
is the standard chip-
select signal which enables communication with the
device. SCLK is used to clock data in and out of serial
interface. In external clock mode, SCLK also sets the
conversion speed.
Digital Output
Output data is read on the rising edge of SCLK at
DOUT, MSB first (D7). In unipolar input mode, the out-
put is straight binary. For bipolar input mode, the output
is twos-complement (see Transfer Function section).
DOUT is active when
CS
is low and high impedance
when
CS
is high. DOUT does not accept external volt-
ages greater than V
DD
. In external-clock mode, data is
clocked out at the maximum clock rate of 500kHz while
conversion is in progress. In internal-clock mode, data
can be clocked out at up to 2MHz clock rate.
Modes of Operation
The MAX1108/MAX1109 feature single-ended or pseu-
do-differential operation in unipolar or bipolar configu-
ration. The device is programmed through the input
control-byte at the DIN pin of the serial interface
(Table 1). Table 2 shows the analog-input configuration
and Table 3 shows the input-voltage ranges in unipolar
and bipolar configuration.
How to S tart a Conversion
A conversion is started by clocking a control byte into
DIN. With
CS
low, each rising edge on SCLK clocks a
bit from DIN into the MAX1108/MAX1109’s internal shift
register. After
CS
falls, the first arriving logic “1” bit at
DIN defines the MSB of the control byte. Until this first
start bit arrives, any number of logic “0” bits can be
clocked into DIN with no effect. Table 1 shows the con-
trol-byte format.
Using the Typical Operating Circuit (Figure 3), the sim-
plest software interface requires two 8-bit transfers to
perform a conversion (one 8-bit transfer to configure
the ADC, and one 8-bit transfer to clock out the 8-bit
conversion result). Figure 6 shows a single-conversion
timing diagram using external clock mode.
Cloc k Modes
The MAX1108/MAX1109 can use either an external ser-
ial clock or the internal clock to perform the successive-
approximation conversion. In both clock modes, the
external clock shifts data in and out of the devices. Bit
3 of control-byte (I/ECLK) programs the clock mode.
Figure 8 shows the timing characteristics common to
both modes.
External Clock
In external clock mode, the external clock not only
shifts data in and out, it also drives the analog-to-digital
conversion steps. In this mode the clock frequency
must be between 50kHz and 500kHz. Single-conver-
sion timing using an external clock begins with a falling
edge on
CS
. When this occurs, DOUT leaves the high
impedance state and goes low. The first “1” clocked
into DIN by SCLK after
CS
is set low is considered as
the start bit. The next seven clocks latch in the rest of
the control byte. On the falling edge of the fourth clock,
track mode is enabled, and on the falling edge of the
sixth clock, acquisition is complete and conversion is
CS
SCLK
DOUT
DIN
I/O
SCK
MISO
MOSI
+3V
SS
a) SPI
CS
SCLK
DOUT
DIN
CS
SCK
MISO
MOSI
+3V
SS
b) QSPI
MAX1108
MAX1109
MAX1108
MAX1109
MAX1108
MAX1109
CS
SCLK
DOUT
DIN
I/O
SK
SO
SI
c) MICROWIRE
Figure 5. Common Serial-Interface Connections
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PDF描述 |
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| MAX1108CUB | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1108 | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1108EUB | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1109CUB | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1109EUB | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1109 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX4135/MAX4136/MAX4137/MAX4138[MAX4135EVKIT ] |
| MAX1109CUB | 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 |
| MAX1109CUB+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2Ch Single-Supply Low-P Serial 8-Bit 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 |
| MAX1109CUB+G07 | 制造商:Maxim Integrated Products 功能描述:10 PINS UMAX PKG - Tape and Reel |
| MAX1109CUB+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2Ch Single-Supply Low-P Serial 8-Bit 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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