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參數(shù)資料
| 型號(hào)： | MAX1086 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 |
| 中文描述： | 150ksps、10位、雙通道單端及單通道真差分ADC，SOT23封裝 |
| 文件頁(yè)數(shù)： | 7/15頁(yè) |
| 文件大?。?/td> | 334K |
| 代理商： | MAX1086 |
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150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23
_______________________________________________________________________________________
7
Detailed Description
The MAX1086
–
MAX1089 analog-to-digital converters
(ADCs) use a successive-approximation conversion
(SAR) technique and an on-chip track-and-hold (T/H)
structure to convert an analog signal into a 10-bit digital
result.
The serial interface provides easy interfacing to micro-
processors (μPs). Figure 3 shows the simplified internal
structure for the MAX1086/MAX1087 (2
–
channels, sin-
gle-ended) and the MAX1088/MAX1089 (1
–
channel,
true-differential).
True-Differential Analog Input Track/Hold
The equivalent circuit of Figure 4 shows the
MAX1086
–
MAX1089
’
s input architecture which is com-
posed of a T/H, input multiplexer, comparator, and
switched-capacitor DAC. The T/H enters its tracking
mode on the rising edge of CNVST. The positive input
capacitor is connected to AIN1 or AIN2 (MAX1086/
MAX1087) or AIN+ (MAX1088/MAX1089). The negative
input capacitor is connected to GND (MAX1086/
MAX1087) or AIN- (MAX1088/MAX1089). The T/H
enters its hold mode on the falling edge of CNVST and
the difference between the sampled positive and nega-
tive input voltages is converted. The time required for
the T/H to acquire an input signal is determined by how
quickly its input capacitance is charged. If the input
signal
’
s source impedance is high, the acquisition time
lengthens, and CNVST must be held high for a longer
period of time. The acquisition time, t
ACQ
, is the maxi-
mum time needed for the signal to be acquired, plus
the power-up time. It is calculated by the following
equation:
t
ACQ
= 7 x (R
S
+ R
IN
) x 24pF + t
PWR
Pin Description
NAME
PIN
MAX1086
MAX1087
MAX1088
MAX1089
FUNCTION
1
V
DD
V
DD
Positive Supply Voltage. +2.7V to +3.6V (MAX1087/MAX1089); +4.75V to +5.25V
(MAX1086/MAX1088). Bypass with a 0.1μF capacitor to GND.
2
AIN1
AIN+
Analog Input Channel 1 (MAX1086/MAX1087) or Positive Analog Input (MAX1088/MAX1089)
3
AIN2
AIN-
Analog Input Channel 2 (MAX1086/MAX1087) or Negative Analog Input (MAX1088/MAX1089)
4
GND
GND
Ground
5
REF
REF
External Reference Voltage Input. Sets the analog voltage range. Bypass with a 0.1μF
capacitor to GND.
6
CNVST
CNVST
Conversion Start. A rising edge powers-up the IC and places it in track mode. At the falling
edge of CNVST, the device enters hold mode and begins conversion. CNVST also selects the
input channel (MAX1086/MAX1087) or input polarity (MAX1088/MAX1089).
7
DOUT
DOUT
Serial Data Output. DOUT transitions the falling edge of SCLK. DOUT goes low at the start of a
conversion and presents the MSB at the completion of a conversion. DOUT goes high-
impedance once data has been fully clocked out.
Serial Clock Input. Clocks out data at DOUT MSB first.
8
SCLK
SCLK
10-BIT
SAR
ADC
CONTROL
OSCILLATOR
INPUT SHIFT
REGISTER
T/H
REF
CNVST
SCLK
DOUT
AIN2
(AIN-)
AIN1
(AIN+)
MAX1086–MAX1089
( ) ARE FOR MAX1088/MAX1089
Figure 3. Simplified Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1086_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:150ksps, 10-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 |
| MAX1086EKA | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
| MAX1086EKA-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 |
| MAX1086ETA+ | 制造商:Maxim Integrated Products 功能描述:150KSPS 10-BIT 2-CHANNEL SINGLE-ENDED AND 1-CHANNEL TRUE-DIF - Rail/Tube |
| MAX1086ETA+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 150ksps 10-Bit 2-Ch Single-Ended 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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