MAX11040 Maxim Integrated Products, MAX11040 Datasheet - Page 8

• Manufacturer Part Number: MAX11040
• Description: Sigma-Delta ADC
• Manufacturer: Maxim Integrated Products

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24-Bit, 4-Channel, Simultaneous-Sampling,
Cascadable, Sigma-Delta ADC
8
(V
C
29, 31, 35
REF3
AVDD
4, 8, 10,
11, 28
12, 27
_______________________________________________________________________________________
PIN
13
14
15
1
2
3
5
6
7
9
= 1µF, T
= V
DVDD
1000
CASCOUT
800
600
400
200
CASCIN
A
0
NAME
AIN0+
AGND
AIN1+
REFIO
DGND
DVDD
AIN0-
AIN1-
REF0
REF1
-40
= +25°C, unless otherwise noted.)
CS
= 3.3V, f
AVDD = DVDD = 3.6V
SHUTDOWN SUPPLY CURRENT
-11
I
AVDD
vs. TEMPERATURE
Negative Analog Input Channel 0
Positive Analog Input Channel 0
ADC0 Buffered Reference Voltage. Bypass REF0 with a 1µF capacitor to AGND.
Analog Ground
Negative Analog Input Channel 1
Positive Analog Input Channel 1
ADC1 Buffered Reference Voltage. Bypass REF1 with a 1µF capacitor to AGND.
Reference Voltage Output/Input. Reference voltage for analog-to-digital conversion. In internal reference
mode, the reference buffer provides a +2.5V nominal output. In external reference mode, overdrive REFIO
with an external reference between 2.3V to 2.7V. Bypass REFIO with a 1µF capacitor to AGND.
Digital Ground
Positive Digital Supply Voltage. Bypass each DVDD to DGND with a 1µF capacitor in parallel with a
0.01µF capacitor as close as possible to the device.
Cascade Input. A logic-low on CASCIN while CS is a logic-low during the last cycle of a byte signals the
device to perform the requested data transfer during subsequent bytes using DIN and DOUT. Once the
requested transfer is completed, the part three-states DOUT and ignores DIN until a new command is
issued. CASCIN is clocked in at the rising edge of SCLK. Connect CASCIN to DGND when not daisy
chaining multiple devices. See the Multiple Device Connection section for connection recommendations.
Cascade Output. CASCOUT is driven low during the last cycle of the last byte of a data transfer to signal
the next device in the daisy chain to begin transferring data on the next byte. CASCOUT changes after the
rising edge of SCLK. Leave CASCOUT unconnected when not daisy chaining multiple devices. See the
Multiple Device Connection section.
Active-Low Chip-Select Input. A falling edge on CS while CASCIN is a logic-low enables DIN and DOUT
for data transfer. A logic-high on CS prevents data from being clocked in on DIN and places DOUT in a
high-impedance state.
XIN CLOCK
TEMPERATURE (°C)
18
47
= 24.576MHz, f
76
I
DVDD
Typical Operating Characteristics (continued)
105
OUT
= 16ksps, V
REFIO
FUNCTION
= 2.5V (external), C
CRYSTAL OSCILLATOR STARTUP TIME
40μs/div
REFIO
= C
Pin Description
MAX11040 toc20
REF0
= C
CLKOUT
500mV/div
REF1
= C
REF2
=