MAX198BC/D Maxim Integrated, MAX198BC/D Datasheet - Page 15

• Manufacturer Part Number: MAX198BC/D
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX198BC/D

• Number Of Channels: 6
• Architecture: SAR
• Conversion Rate: 100 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended
• Interface Type: Parallel
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Power Dissipation: 1143 mW
• Number Of Converters: 1
• Voltage Reference: 4.096 V

Careful printed circuit board layout is essential for best
system performance. For best performance, use a
ground plane. To reduce crosstalk and noise injection,
keep analog and digital signals separate. Digital
ground lines can run between digital signal lines to
minimize interference. Connect analog grounds and
DGND in a star configuration to AGND. For noise-free
operation, ensure the ground return from AGND to the
supply ground is low impedance and as short as possi-
ble. Connect the logic grounds directly to the supply
ground. Bypass V
to AGND to minimize high- and low-frequency fluctua-
tions. If the supply is excessively noisy, connect a 5Ω
resistor between the supply and V
Figure 12.
_________________________________________________________Functional Diagram
CH5
CH4
CH3
CH2
CH1
CH0
CLK
WR
INT
RD
CS
Layout, Grounding, and Bypassing
______________________________________________________________________________________
DD
CLOCK
CONDITIONING
OVERVOLTAGE
TOLERANT
with 0.1µF and 4.7µF capacitors
SIGNAL
BLOCK
MUX
&
CONTROL LOGIC
LATCHES
Multirange, Single +5V, 12-Bit DAS
&
DD
, as shown in
REF
T/H
8
CHARGE REDISTRIBUTION
THREE-STATE, BIDIRECTIONAL
with 12-Bit Bus Interface
12-BIT DAC
I/O INTERFACE
Figure 12. Power-Supply Grounding Connection
APPROXIMATION
* OPTIONAL
** CONNECT AGND AND DGND WITH A GROUND PLANE OR A SHORT TRACE
R* = 5
SUCCESSIVE-
12-BIT DATA BUS
REGISTER
D0–D11
12
12
+5V
V
DD
1.638
A
V
4.7 F
0.1 F
=
AGND
REFADJ
MAX196
MAX198
COMP
10k
MAX196
MAX198
**
SUPPLY
REFERENCE
+2.5V
DGND
+5V
CIRCUITRY
DIGITAL
V
AGND
DGND
GND
DD
DGND
15