MAX1203BCAP+ Maxim Integrated Products, MAX1203BCAP+ Datasheet - Page 21

• Manufacturer Part Number: MAX1203BCAP+
• Description: IC ADC 12BIT 8CH 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1203BCAP+

• Number Of Bits: 12
• Sampling Rate (per Second): 133k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 7.5mW
• Voltage Supply Source: Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Resolution: 12 bit
• Interface Type: Serial (4-Wire, SPI, Microwire)
• Snr: 70 dB
• Voltage Reference: 4.096 V
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Maximum Power Dissipation: 640 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Input Voltage: 5 V
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 15. Unipolar Transfer Function, 4.096V = Full Scale
(“star” ground point) at GND. Connect all other analog
grounds to this ground. No other digital system ground
should be connected to this single-point analog
ground. The ground return to the power supply for this
ground should be low impedance and as short as pos-
sible for noise-free operation.
High-frequency noise in the power supplies can affect
the ADC’s high-speed comparator. Bypass these sup-
plies to the single-point analog ground with 0.1µF and
4.7µF
MAX1202/MAX1203. Minimize capacitor lead lengths
for best supply-noise rejection. If the +5V power supply
is very noisy, a 10Ω resistor can be connected as a
lowpass filter, as shown in Figure 18.
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
OUTPUT CODE
bypass
0
1
2
INPUT VOLTAGE (LSBs)
______________________________________________________________________________________
3
capacitors
FULL-SCALE
TRANSITION
5V, 8-Channel, Serial, 12-Bit ADCs
FS - 3/2LSB
close
1LSB =
FS =
FS
+ 4.096V
+4.096V
to
4096
the
with 3V Digital Interface
Figure 16. Bipolar Transfer Function, ±4.096V/2 = Full Scale
Figure 17. MAX1202 Reference-Adjust Circuit
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
100k
OUTPUT CODE
+5V
24k
-FS
1LSB =
FS = +2.048V
+4.096V
4096
510k
0.01µF
INPUT VOLTAGE (LSBs)
0V
12
REFADJ
MAX1202
+FS - 1LSB
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