參數(shù)資料
型號(hào)： MAX1111
廠商： Maxim Integrated Products, Inc.
英文描述： +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
中文描述： +2.7V、低功耗、多通道、串行8位ADC
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 284K
代理商： MAX1111
M
+2.7V, Low-Power, Multic hannel,
S erial 8-Bit ADCs
8
_______________________________________________________________________________________
_______________Detailed Desc ription
The MAX1110/MAX1111 analog-to-digital converters
(ADCs) use a successive-approximation conversion
technique and input track/hold (T/H) circuitry to convert
an analog signal to an 8-bit digital output. A flexible seri-
al interface provides easy interface to microprocessors
(μPs). Figure 3 shows the Typical Operating Circuit.
Pseudo-Differential Input
The sampling architecture of the ADC’s analog com-
parator is illustrated in Figure 4, the equivalent input cir-
cuit. In single-ended mode, IN+ is internally switched to
the selected input channel, CH_, and IN- is switched to
COM. In differential mode, IN+ and IN- are selected
from the following pairs: C H0/C H1, C H2/C H3,
CH4/CH5, and CH6/CH7. Configure the MAX1110
channels with Table 1 and the MAX1111 channels with
Table 2.
In differential mode, IN- and IN+ are internally switched
to either of the analog inputs. This configuration is
pseudo-differential to the effect that only the signal at
IN+ is sampled. The return side (IN-) must remain sta-
ble within ±0.5LSB (±0.1LSB for best results) with
respect to AGND during a conversion. To accomplish
this, connect a 0.1μF capacitor from IN- (the selected
analog input) to AGND.
During the acquisition interval, the channel selected as
the positive input (IN+) charges capacitor C
HOLD
. The
acquisition interval spans two SCLK cycles and ends
on the falling SCLK edge after the last bit of the input
control word has been entered. At the end of the acqui-
sition interval, the T/H switch opens, retaining charge
on C
HOLD
as a sample of the signal at IN+. The conver-
sion interval begins with the input multiplexer switching
C
HOLD
from the positive input (IN+) to the negative
input (IN-). In single-ended mode, IN- is simply COM.
This unbalances node ZERO at the input of the com-
parator. The capacitive DAC adjusts during the remain-
der of the conversion cycle to restore node ZERO to 0V
within the limits of 8-bit resolution. This action is equiva-
lent to transferring a charge of 18pF x (V
IN+
- V
IN-
) from
C
HOLD
to the binary-weighted capacitive DAC, which in
turn forms a digital representation of the analog input
signal.
T rac k/Hold
The T/H enters its tracking mode on the falling clock
edge after the sixth bit of the 8-bit control byte has
been shifted in. It enters its hold mode on the falling
clock edge after the eighth bit of the control byte has
been shifted in. If the converter is set up for single-
ended inputs, IN- is connected to COM, and the con-
verter samples the “+” input; if it is set up for differential
inputs, IN- connects to the “-” input, and the difference
(IN+ - IN-) is sampled. At the end of the conversion, the
positive input connects back to IN+, and C
HOLD
charges to the input signal.
V
DD
I/O
SCK (SK)
MOSI (SO)
MISO(SI)
V
SS
SHDN
SSTRB
DOUT
DIN
SCLK
CS
COM
DGND
AGND
V
DD
CH7
1
μ
F
0.1
μ
F
1
μ
F
CH0
ANALOG
INPUTS
MAX1110
MAX1111
CPU
+2.7V
REFIN
REFOUT
Figure 3. Typical Operating Circuit
CH0
CH1
CH2
CH3
CH4*
CH5*
CH6*
CH7*
COM
C
SWITCH
TRACK
T/H
SWITCH
C
HOLD
HOLD
CAPACITIVE DAC
REFIN
ZERO
COMPARATOR
–
+
18pF
6.5k
R
IN
SINGLE-ENDED MODE: IN+ = CHO–CH7, IN- = COM.
DIFFERENTIAL MODE: IN+ AND IN- SELECTED FROM PAIRS OF
CH0/CH1, CH2/CH3, CH4*/CH5*, CH6*/CH7*.
*MAX1110 ONLY
AT THE SAMPLING INSTANT,
THE MUX INPUT SWITCHES
FROM THE SELECTED IN+
CHANNEL TOTHE SELECTED
IN- CHANNEL.
INPUT
MUX
Figure 4. Equivalent Input Circuit
相關(guān)PDF資料
PDF描述
MAX1111CEE +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
MAX1111EEE +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
MAX1111EPE +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
MAX1111MJE +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
MAX1115 Single-Supply, Low-Power, Serial 8-Bit ADCs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX11110 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:2Msps/3Msps, Low-Power, Serial 12-/10-/8-Bit ADCs
MAX11110AUT+ 制造商:Maxim Integrated Products 功能描述:SMALL, 2.2V TO 3.6V, LOW-POWER, 1-/2-CHANNEL, SERIAL, 8-/10- - Rail/Tube
MAX11110AUT+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10Bit 1Ch 2Msps Serial 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
MAX11111 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:2Msps/3Msps, Low-Power, Serial 12-/10-/8-Bit ADCs
MAX11111ATB+ 制造商:Maxim Integrated Products 功能描述:SMALL, 2.2V TO 3.6V, LOW-POWER, 1-/2-CHANNEL, SERIAL, 8-/10- - Rail/Tube
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*