MAX199BEWI+ Maxim Integrated Products, MAX199BEWI+ Datasheet - Page 15

• Manufacturer Part Number: MAX199BEWI+
• Description: IC DAS 12BIT 8CH 28-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Data Acquisition System (DAS)r

Specifications of MAX199BEWI+

• Resolution (bits): 12 b
• Sampling Rate (per Second): 100k
• Data Interface: Parallel
• Voltage Supply Source: Single Supply
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Output data coding for the MAX199 is binary in unipolar
mode with 1LSB = (FS / 4096) and twos-complement
binary in bipolar mode with 1LSB = [(2 x
Code transitions occur halfway between successive-
integer LSB values. Figures 10 and 11 show the
input/output (I/O) transfer functions for unipolar and
bipolar operations, respectively.
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.
Figure 12. Power-Supply Grounding Connection
* OPTIONAL
** CONNECT AGND AND DGND WITH A GROUND PLANE OR A SHORT TRACE
R* = 5
+5V Supply, 12-Bit DAS with 8+4 Bus Interface
+5V
V
DD
Layout, Grounding, and Bypassing
4.7 F
0.1 F
AGND
MAX199
______________________________________________________________________________________
DD
with 0.1µF and 4.7µF capacitors
**
SUPPLY
DGND
Transfer Function
Multi-Range (±4V, ±2V, +4V, +2V),
DD
, as shown in
+5V
CIRCUITRY
|
DIGITAL
FS
|
) / 4096].
GND
DGND
TRANSISTOR COUNT: 2956
SUBSTRATE CONNECTED TO GND
** Contact factory for availability and processing to MIL-STD-883.
___________________Chip Topography
SHDN
HBEN
_Ordering Information (continued)
MAX199AENI
MAX199BENI
MAX199AEWI
MAX199BEWI
MAX199AEAI
MAX199BEAI
MAX199AMYI
MAX199BMYI
RD
D7
D6
D5
D4
D3
PART
D2
WR
D1
CS
D0
TEMP. RANGE
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
CLK
(3.659mm)
0.144"
AGND
DGND
V
DD
CH0
CH1
V
CC
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
28 Wide SO
28 SSOP
28 SSOP
28 Narrow Ceramic SB**
28 Narrow Ceramic SB**
REF
REFADJ
INT
CH7
CH6
CH5
CH4
CH3
CH2
(5.870mm)
0.231"
15