MAX11646EUA+ Maxim Integrated Products, MAX11646EUA+ Datasheet - Page 19

• Manufacturer Part Number: MAX11646EUA+
• Description: IC ADC 10BIT I2C 94.4KSPS 8UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX11646EUA+

• Number Of Bits: 10
• Sampling Rate (per Second): 94.4k
• Data Interface: I²C, Serial
• Number Of Converters: 1
• Power Dissipation (max): 362mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Number Of Adc Inputs: 2
• Conversion Rate: 1 Ksps to 94.4 Ksps
• Resolution: 10 bit
• Input Type: Single-Ended
• Interface Type: I2C
• Snr: 60 dB
• Voltage Reference: Internal 4.096 V
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Power Dissipation: 362 mW
• Maximum Operating Temperature: + 85 C
• Input Voltage: 4.5 V to 5.5 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Output data coding for the MAX11646/MAX11647 is
binary in unipolar mode and two’s complement in bipo-
lar mode with 1 LSB = (V
of bits (10). Code transitions occur halfway between
successive-integer LSB values. Figures 12 and 13
show the input/output (I/O) transfer functions for unipo-
lar and bipolar operations, respectively.
Figure 12. Unipolar Transfer Function
Figure 13. Bipolar Transfer Function
*V
11 . . . 111
11 . . . 110
00 . . . 011
00 . . . 010
11 . . . 101
00 . . . 001
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
00 . . . 000
COM
≥ V
OUTPUT CODE
OUTPUT CODE
REF
0
/2
Low-Power, 1-/2-Channel, I
1 LSB =
ZS = 0
-FS =
1
*V
FS =
- FS
IN
= (AIN+) - (AIN-)
2
______________________________________________________________________________________
-V
V
INPUT VOLTAGE (LSB)
1024
REF
V
2
2
REF
REF
3
in Ultra-Tiny 1.9mm x 2.2mm Package
REF
INPUT VOLTAGE (LSB)
FULL-SCALE
TRANSITION
/2
N
Transfer Functions
) where N is the number
0
FS - 3/2 LSB
MAX11646
MAX11647
1 LSB =
FS = V
ZS = GND
MAX11646
MAX11647
+FS - 1 LSB
FS
REF
1024
V
REF
Only use PCBs. Wire-wrap configurations are not rec-
ommended since the layout should ensure proper sep-
aration of analog and digital traces. Do not run analog
and digital lines parallel to each other, and do not lay
out digital signal paths underneath the ADC package.
Use separate analog and digital PCB ground sections
with only one star point (Figure 14) connecting the two
ground systems (analog and digital). For lowest noise
operation, ensure the ground return to the star ground’s
power supply is low impedance and as short as possi-
ble. Route digital signals far away from sensitive analog
and reference inputs.
High-frequency noise in the power supply (V
influence the proper operation of the ADC’s fast com-
parator. Bypass V
two parallel capacitors, 0.1µF and 4.7µF, located as
close as possible to the MAX11646/MAX11647 power-
supply pin. Minimize capacitor lead length for best sup-
ply noise rejection, and add an attenuation resistor (5Ω)
in series with the power supply if it is extremely noisy.
Integral nonlinearity (INL) is the deviation of the values on
an actual transfer function from a straight line. This straight
line can be either a best straight-line fit or a line drawn
between the end points of the transfer function, once offset
and gain errors have been nullified. The MAX11646/
MAX11647’s INL is measured using the endpoint.
Figure 14. Power-Supply Grounding Connection
*OPTIONAL
R* = 5Ω
3V OR 5V
V
DD
Layout, Grounding, and Bypassing
DD
2
MAX11646
MAX11647
C, 10-Bit ADCs
0.1μF
4.7μF
to the star ground with a network of
SUPPLIES
Integral Nonlinearity
GND
V
LOGIC
Definitions
= 3V/5V
3V/5V
CIRCUITRY
DIGITAL
DD
DGND
GND
) could
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