MAX11666AUB+ Maxim Integrated, MAX11666AUB+ Datasheet - Page 25

• Manufacturer Part Number: MAX11666AUB+
• Description: Analog to Digital Converters - ADC 1/2Ch 12-Bit 500ksps Low Power SPI
• Manufacturer: Maxim Integrated

Specifications of MAX11666AUB+

• Rohs: yes
• Number Of Channels: 2
• Architecture: SAR
• Conversion Rate: 500 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended
• Interface Type: SPI
• Operating Supply Voltage: 2.2 V to 3.6 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: uMAX-10
• Maximum Power Dissipation: 707.3 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 2.2 V to 3.6 V

and stays within a given error band centered on the
resulting steady-state amplifier output level. The
input sampling capacitor charges during the sampling
cycle, referred to as the acquisition period. During this
acquisition period, the settling time is affected by the
input resistance and the input sampling capacitance.
This error can be estimated by looking at the settling of
an RC time constant using the input capacitance and
the source impedance over the acquisition time period.
Figure
MAX4430, offering a settling time of 37ns at 16 bits, is
an excellent choice for this application. See the THD
vs. Input Resistance graph in the Typical Operating
Characteristics.
Figure 15. Typical Application Circuit
15 shows a typical application circuit. The
AIN1
AIN2
V
V
DC
DC
______________________________________________________________________________________
500I
500I
0.1µF
0.1µF
4
3
4
3
MAX4430
MAX4430
+5V
+5V
5
2
5
2
100pF C0G
100pF C0G
500I
500I
0.1µF
0.1µF
10µF
10µF
1
1
-5V
-5V
10µF
10µF
10I
10I
ADC
0.1µF
C0G CAPACITOR
C0G CAPACITOR
3V
Serial 12-/10-/8-Bit ADCs
470pF
470pF
0.1µF
10µF
10µF
For devices using an external reference, the choice of
the reference determines the output accuracy of the
ADC. An ideal voltage reference provides a perfect initial
accuracy and maintains the reference voltage indepen-
dent of changes in load current, temperature, and time.
Considerations in selecting a reference include initial
voltage accuracy, temperature drift, current source,
sink capability, quiescent current, and noise.
shows a typical application circuit using the MAX6126
to provide the reference voltage. The MAX6033 and
MAX6043 are also
500ksps, Low-Power,
AGND
AIN1
AIN2
V
REF
DD
7
6
4
3
OUTF
OUTS
GNDS
GND
MAX11662
MAX11664
MAX11666
MAX6126
EP
excellent
NR
IN
OVDD
SCLK
DOUT
CS
CHSEL
2
1
Choosing a Reference
V
choices.
OVDD
MISO
1µF
0.1µF
0.1µF
SCK
SS
CPU
+5V
10µF
0.1µF
Figure
25
15