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參數(shù)資料
| 型號： | MAX7651 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Flash Programmable 12-Bit Integrated Data-Acquisition Systems |
| 中文描述： | 閃存、可編程、12位、集成數(shù)據(jù)采集系統(tǒng) |
| 文件頁數(shù)： | 23/36頁 |
| 文件大?。?/td> | 479K |
| 代理商： | MAX7651 |
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M
Flash Programmable 12-Bit Integrated
Data-Acquisition Systems
______________________________________________________________________________________
23
External Reference
The MAX7651/MAX7652 require external reference volt-
ages at V
REF+
and V
REF-
. A single reference voltage
can be used at V
REF+,
when V
REF-
is connected to
AGND. The positive reference voltages must be no
greater than the analog supply voltage AV
DD
and
capable of supplying 30μA. Bypass each reference
voltage to AGND with a 0.1μF capacitor in parallel with
a 10μF low ESR capacitor.
PWM Digital-to-Analog Converters (DACs)
The MAX7651/MAX7652 provide two pulse-width mod-
ulated (PWM) DACs for applications that do not require
high conversion accuracy. Figure 8 shows the pulse-
width-modulator block diagram. The clock signal is
divided by 2 (x + 1), where x is the content of the
Pulse-Width Prescaler (PWPS) SFR register. This
reduced frequency signal is used to drive a modulo-
255 counter. When the counter value exceeds the
value stored in SFRs PWDA (Output A) or PWDB
MD3
0
0
0
0
0
0
0
0
1
1
1
1
MD2
0
0
0
0
1
1
1
1
0
0
0
0
MD1
0
0
1
1
0
0
1
1
0
0
1
1
MD0
0
1
0
1
0
1
0
1
0
1
0
1
MODE
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Single-ended
Differential
Differential
Differential
Differential
AIN+
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN1
AIN3
AIN5
AIN7
AIN-
ACOM
ACOM
ACOM
ACOM
ACOM
ACOM
ACOM
ACOM
AIN0
AIN2
AIN4
AIN6
1
1
0
0
—
REF+
REF-
Table 8. Analog Input Selection
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
-FS
0V
INPUT VOLTAGE (LSBs)
+FS - 1LSB
1LSB = V
4096
V
IN
= (V
AIN
) - (V
ACOM
)
V
REF
= (V
REF+
) - (V
REF-
)
+FS = +V
REF
2
-FS = -V
REF
2
Figure 7a. Single-Ended Mode Transfer Function
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
-FS
0V
INPUT VOLTAGE (LSBs)
+FS - 1LSB
V
IN
= (V
AIN
+) - (V
AIN-
)
V
REF
= (V
REF+
) - (V
REF-
)
1LSB = 2V
REF
4096
+FS = +V
REF
-FS = -V
REF
Figure 7b. Differential Mode Transfer Function
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PDF描述 |
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| MAX7651ECB | Flash Programmable 12-Bit Integrated Data-Acquisition Systems |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7651CCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX7651ECB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX7651EVKIT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX7652CCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX7652ECB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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