MX7824KCAG データシートの表示（PDF） - Maxim Integrated
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MX7824KCAG Datasheet PDF : 12 Pages
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CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
fMAX permits a maximum sampling rate of 50kHz per
channel when using the MAX158/MX7828 and 100kHz
per channel when using the MAX154/MX7824. These
rates are well above the Nyquist requirement of 20kHz
sampling rate for a 10kHz input bandwidth.
Bipolar Input Operation
The circuit in Figure 10a can be used for bipolar input
operation. The input voltage is scaled by an amplifier so
that only positive voltages appear at the ADC’s inputs.
An external reference should be used for the MX7824/
MX7828, but is not needed with the MAX154/MAX158.
The analog input range is ±4V and the output code is
complementary offset binary. The ideal input/output
characteristic is shown in Figure 10b.
RS AIN1
VIN
RMUX
CS
12pF
CS
2pF
RON
1pF
TO LS
•
1pF
LADDER
•
•
15 LSB COMPARATORS
11.5Ω
VIN
10.0k
0.01µF
3.57k
16.2k
0.01µF
+5V
0.1µF
47µF
ONLY CHANNEL 1 SHOWN
AIN1
CS
MAX154 RDY
MAX158
RD
VREF+
INT
REF OUT
VDD
VREF-
GND
DB0–DB7
Figure 10a. Bipolar ±4V Input Operation
RON
1pF
TO MS
• 1pF
LADDER
•
•
16 MSB COMPARATORS
Figure 9a. Equivalent Input Circuit
RS AIN1
B MUX
600Ω
RON
350Ω
VIN
CS1
2pF
CS2
2pF
32pF
11111111
11111110
11111101
10000010
10000001
10000000
01111111
01111110
00000010
00000001
00000000
-FS + 1LSB
2
FS = 8V
1LSB = FS / 256
+FS
2
0V
AIN INPUT VOLTAGE (LSBs)
Figure 9b. RC Network Model
Figure 10b. Transfer Function for ±4V Input Operation
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