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MX7824KN+

P1-P3P4-P6P7-P9P10-P12
MX7824/MX7828
f
MAX
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.
CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
10 ______________________________________________________________________________________
1pFC
S
12pF
C
S
2pF
1pF
•
•
•
15 LSB COMPARATORS
TO LS
LADDER
R
ON
1pF
1pF
•
•
•
16 MSB COMPARATORS
TO MS
LADDER
R
ON
R
MUX
R
S
V
IN
AIN1
11111111
11111110
10000010
10000001
01111111
01111110
10000000
00000001
00000000
00000010
0V
AIN INPUT VOLTAGE (LSBs)
FS = 8V
1LSB = FS / 256
11111101
+FS
2
-FS
+ 1LSB
2
R
S
V
IN
AIN1
C
S1
2pF
C
S2
2pF
32pF
B MUX
600Ω
R
ON
350Ω
MAX154
MAX158
AIN1
ONLY CHANNEL 1 SHOWN
V
REF
+
REF OUT
V
DD
V
REF
-
GND
11.5Ω
3.57k
10.0k
0.01µF
0.01µF
0.1µF
47µF
16.2k
V
IN
+5V
CS
RDY
INT
DB0–DB7
RD
Figure 9a. Equivalent Input Circuit
Figure 10b. Transfer Function for ±4V Input Operation
Figure 9b. RC Network Model
Figure 10a. Bipolar ±4V Input Operation
MX7824/MX7828
CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
______________________________________________________________________________________ 11
MAX154
MAX158
MX7824
MX7828
RD
RDY
*A2 ON MAX158/MX7828 ONLY.
CS
A1 A2*A0
5V
DATA BUS
A15
A0
ZBO
MREQ
WAIT
RD
DB0–DB7
D0–D7
ADDRESS
DECODE
EN
5k
ADDRESS BUS
MAX158
MX7828
AIN2
18
26
+5V
12
23
24
25
15 14
AIN8
V
REF+
AIN1 CS
6
5
28
+5V
27
16
RD
A1
DB0–DB7
SPEECH
INPUT
A0
DATA
V
DD
AIN7
BANDPASS
FILTER 1
BANDPASS
FILTER 2
AMP
V
REF-
GND
BANDPASS
FILTER 7
BANDPASS
FILTER 8
A2
MAX154
MX7824
AIN2
11
24 16 10
+5V
21
22
V
REF-
V
REF+
AIN1
INT
4
3
2
13
A0
DB0–DB7
V
DD
V
DD
SAMPLE
PULSE
V
SS
CS
RD
AIN3
1
AIN4
14
GND
12
A1
A0
A1
15
16
17
MX7226
4
18
3
+15V
6
5
A1
V
REF
AGND
DB0–DB7
2
V
OUT
A
1
20
19
V
OUT
B
V
OUT
C
V
OUT
D
A0
DGND
WR
Figure 12. Speech Analysis Using Real-Time Filtering
Figure 13. 4-Channel Fast Sample and Infinite Hold
Figure 11. Simple Mode 0 Interface
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
MX7824/MX7828
CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
___________________Chip Topography_Ordering Information (continued)
±
1
/
2
24 SSOP-40°C to +85°CMX7824LEAG
±124 SSOP-40°C to +85°CMX7824KEAG
±128 CERDIP-55°C to +125°CMX7828TQ
±
1
/
2
28 CERDIP-55°C to +125°CMX7828UQ
±128 CERDIP-40°C to +85°CMX7828BQ
±
1
/
2
28 CERDIP-40°C to +85°CMX7828CQ
±128 SSOP-40°C to +85°CMX7828KEAI
±
1
/
2
28 SSOP-40°C to +85°CMX7828LEAI
±128 PLCC0°C to +70°CMX7828KP
±
1
/
2
28 PLCC0°C to +70°CMX7828LP
±128 SSOP0°C to +70°CMX7828KCAI
±
1
/
2
28 SSOP0°C to +70°CMX7828LCAI
±1
±
1
/
2
±1
±
1
/
2
±1
±
1
/
2
±1
28 Wide SO
28 Wide SO0°C to +70°C
0°C to +70°C
±
1
/
2
ERROR
(LSB)
MX7828KCWI
MX7828LCWI
28 Plastic DIP
28 Plastic DIP
24 CERDIP-55°C to +125°C
0°C to +70°C
0°C to +70°CMX7828KN
MX7828LN
MX7824TQ
24 CERDIP
24 CERDIP
24 CERDIP
PIN-PACKAGETEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-55°C to +125°CMX7824UQ
MX7824BQ
MX7824CQ
PART
A1
DB3
AIN3
(N.C.)
AIN4
(N.C.)
AIN5
(AIN1)
AIN6
(AIN2)
AIN7
(AIN3)
AIN8
(AIN4)
A0
INT
GND
0.127"
(3.228mm)
0.124"
(3.150mm)
V
REF
-
V
REF
+ ADY
A2 (N.C.)
DB7
DB6
DB5
DB4
CS
V
DD
A0
DB2
DB1
AIN2 (N.C.)
AIN1 (N.C.)
TP (REF OUT)
DB0
( ) ARE FOR MAX154/MX7824
P1-P3P4-P6P7-P9P10-P12

MX7824KN+

Mfr. #:
Buy MX7824KN+
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC 8-Bit 4Ch Precision ADC
Lifecycle:
New from this manufacturer.
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