MAX158AEWI+T Maxim Integrated, MAX158AEWI+T Datasheet - Page 10

• Manufacturer Part Number: MAX158AEWI+T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX158AEWI+T

• Number Of Channels: 8
• Architecture: Half-Flash
• Conversion Rate: 400 KSPs
• Resolution: 8 bit
• Input Type: Single-Ended
• Snr: Yes
• Interface Type: Parallel
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Package / Case: SOIC-28 Wide
• Maximum Power Dissipation: 450 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 2
• Voltage Reference: 2.5 V

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. 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 and Reference
Figure 9a. Equivalent Input Circuit
Figure 9b. RC Network Model
Figure 10a. Bipolar ±4V Input Operation
10
V
IN
ONLY CHANNEL 1 SHOWN
______________________________________________________________________________________
11.5
0.01 F
R
10.0k
V
0.1 F
S
V
+5V
IN
IN
R
S
AIN1
AIN1
16.2k
C
2pF
R
C
12pF
S1
B MUX
MUX
S
600
47 F
3.57k
0.01 F
Bipolar Input Operation
C
2pF
TO MS
LADDER
TO LS
LADDER
R
R
S
ON
ON
C
2pF
S2
16 MSB COMPARATORS
15 LSB COMPARATORS
350
R
AIN1
V
REFOUT
V
V
GND
ON
REF
DD
REF
+
-
MAX154
MAX158
1pF
1pF
•
•
•
•
•
•
DB0-DB7
32pF
1pF
1pF
RDY
INT
CS
RD
Figure 10b. Transfer Function for ±4V Input Operation
Figure 11. Simple Mode 0 Interface
11111111
11111110
11111101
10000010
10000001
10000000
01111111
01111110
00000010
00000001
00000000
*A2 ON MAX158.
ZBO
D0-D7
MREQ
WAIT
A15
RD
-FS + 1LSB
A0
2
5V
EN
5k
ADDRESS BUS
DATA BUS
ADDRESS
DECODE
AIN INPUT VOLTAGE (LSBs)
0V
FS = 8V
1LSB = FS / 256
A0
CS
RDY
RD
DB0-DB7
MAX154
MAX158
A1
+FS
A2*
2