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參數(shù)資料
| 型號： | MAX1117EKA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| 中文描述： | 2-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-178BA, SOT-23, 8 PIN |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 406K |
| 代理商： | MAX1117EKA |
M
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
8
_______________________________________________________________________________________
V
DD
I/O
SCK (SK)
MISO (SI)
GND
DOUT
SCLK
CNVST
GND
V
DD
0.1
μ
F
1
μ
F
CH0
REF*
* MAX1118 ONLY
1
μ
F
ANALOG
INPUTS
MAX1117
MAX1118
MAX1119
CPU
V
DD
CH1
Figure 3. Typical Operating Circuit
GND
C
HOLD
16pF
CAPACITIVE DAC
COMPARATOR
R
IN
6.5k
AUTOZERO
RAIL
TRACK
HOLD
CH0
CH1
Figure 4. Equivalent Input Circuit
Detailed Description
The MAX1117/MAX1118/MAX1119 ADCs use a suc-
cessive-approximation conversion technique and input
T/H circuitry to convert an analog signal to an 8-bit digi-
tal output. The SPI/QSPI/MICROWIRE compatible inter-
face directly connects to microprocessors (μPs) without
additional circuity (Figure 3).
Track/Hold
The input architecture of the ADC is illustrated in Figure
4
’
s equivalent-input circuit and is composed of the T/H,
the input multiplexer, the input comparator, the
switched capacitor DAC, and the auto-zero rail.
The acquisition interval begins with the falling edge of
CNVST. During the acquisition interval, the analog
inputs (CH0, CH1) are connected to the holding capac-
itor (C
HOLD
). Once the acquisition has completed, the
T/H switch opens and C
HOLD
is connected to GND,
retaining the charge on C
HOLD
as a sample of the sig-
nal at the analog input.
Sufficiently low source impedance is required to ensure
an accurate sample. A source impedance <1.5k
is
recommended for accurate sample settling. A 100pF
capacitor at the ADC inputs will also improve the accu-
racy of an input sample.
Conversion Process
The MAX1117/MAX1118/MAX1119 conversion process
is internally timed. The total acquisition and conversion
process takes <7.5μs. Once an input sample has been
acquired, the comparator
’
s negative input is then con-
V
DD
3k
C
LOAD
GND
DOUT
C
LOAD
GND
3k
DOUT
a)
V
OL
TO V
OH
b)
HIGH-Z to V
OL
AND V
OH
to V
OL
V
DD
3k
C
LOAD
GND
DOUT
C
LOAD
GND
3k
DOUT
a)
V
OH
TO HIGH-Z
b)
V
OL
TO HIGH-Z
Figure 1. Load Circuits for Enable Time
Figure 2. Load Circuits for Disable Time
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PDF描述 |
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| MAX1118EKA | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1119 | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1119EKA | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1117 | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs |
| MAX1118 | 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 |
|---|---|
| MAX1117EKA+ | 制造商:Maxim Integrated Products 功能描述:ADC SGL SAR 100KSPS 8BIT SERL 8PIN SOT-23 - Rail/Tube |
| MAX1117EKA+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2Ch Single-Supply Low Pwr 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 |
| MAX1117EKA+TW | 制造商:Maxim Integrated Products 功能描述:+2.7V TO +3.6V, SINGLE-SUPPLY, LOW-POWER, 2-C - Tape and Reel |
| MAX1117EKA-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 |
| MAX1117EKA-TW | 制造商:Maxim Integrated Products 功能描述:+2.7V TO +3.6V, SINGLE-SUPPLY, LOW-POWER, 2-C - Tape and Reel |
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