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參數(shù)資料
| 型號： | MAX148 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs(8通道，133ksps，串行10位A/D轉(zhuǎn)換器) |
| 中文描述： | +2.7V至+5.25V、低功耗、8通道、串行10位ADC |
| 文件頁數(shù)： | 16/20頁 |
| 文件大小： | 200K |
| 代理商： | MAX148 |
M
+2.7V, Low-Power, 8-Channel,
S erial 10-Bit ADC
16
______________________________________________________________________________________
T ransfer Func tion
Table 6 shows the full-scale voltage ranges for unipolar
and bipolar modes. The external reference must have a
temperature coefficient of 20ppm/°C or less to achieve
accuracy to within 1LSB over the commercial tempera-
ture range of 0°C to +70°C. See the MAX872 for a
micropower 2.5V reference.
Figure 14 depicts the nominal, unipolar input/output
(I/O) transfer function, and Figure 15 shows the bipolar
input/output transfer function. Code transitions occur
halfway between successive-integer LSB values.
Output coding is binary, with 1LSB = 2.44mV (2.500V /
1024) for unipolar operation and 1LSB = 2.44mV
[(2.500V / 2 - -2.500V / 2) / 1024] for bipolar operation.
Layout, Grounding, and Bypassing
For best performance, use printed circuit boards.
Wire-wrap boards are not recommended. Board layout
should ensure that digital and analog signal lines are
separated from each other.
Do not run analog and digital (especially clock) lines
parallel to one another, or digital lines underneath the
ADC package.
Figure 16 shows the recommended system ground
connections. A single-point analog ground (“star”
ground point) should be established at AGND, sepa-
rate from the logic ground. Connect all other analog
grounds and DGND to the star ground. No other digital
system ground should be connected to this ground.
The ground return to the power supply for the star
ground should be low impedance and as short as pos-
sible for noise-free operation.
High-frequency noise in the V
DD
power supply may
affect the high-speed comparator in the ADC. Bypass
the supply to the star ground with 0.1μF and 4.7μF
capacitors close to pin 20 of the MAX148. Minimize
capacitor lead lengths for best supply-noise rejection. If
the +3V power supply is very noisy, a 10
resistor can
be connected as a lowpass filter (Figure 16).
OUTPUT CODE
FULL-SCALE
TRANSITION
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
1
2
3
0
(COM)
FS
FS - 3/2LSB
FS = VREF + COM
ZS = COM
1LSB = 1024
INPUT VOLTAGE (LSBs)
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
- FS
COM
(VREF/2)
INPUT VOLTAGE (LSBs)
OUTPUT CODE
ZS = COM
+FS - 1LSB
+ COM
F
S
= V
REF
2
-FS =
+ COM
-V
REF
2
1LSB = V
REF
1024
Figure 14. Unipolar Transfer Function, Full Scale (FS) = VREF
+ COM, Zero Scale (ZS) = COM
Figure 15. Bipolar Transfer Function, Full Scale (FS) = VREF/2
+ COM , Zero Scale (ZS) = COM
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