MAX1414CAI+ Maxim Integrated Products, MAX1414CAI+ Datasheet - Page 42

• Manufacturer Part Number: MAX1414CAI+
• Description: IC DAS 16BIT LP 28-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Data Acquisition System (DAS)r

Specifications of MAX1414CAI+

• Resolution (bits): 16 b
• Sampling Rate (per Second): 60
• Data Interface: Serial
• Voltage Supply Source: Analog and Digital
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Number Of Converters: 1
• Resolution: 16 bit
• Interface Type: Serial (4-Wire, SPI, QSPI, Microwire)
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Power Dissipation: 762 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
where NB is the decimal value of the DAC’s binary
input code. Table 12 shows digital codes (offset binary)
and corresponding output voltages for Figure 18
assuming R1 = R2.
Power to the MAX1407/MAX1408/MAX1409/MAX1414
family can be supplied in a number of ways. Figures 19,
42
Figure 21. Power-Supply Circuit Using MAX640 Step-Down DC-DC Converter
Figure 22. Power-Supply Circuit Using Direct Battery Connection
V
BAT
*ONE Li+ COIN OR TWO BUTTON CELLS
______________________________________________________________________________________
E1*
CPLL
V
10µF
AGND
V
OUT
BAT
18nF
MAX1407
MAX1408
MAX1409
MAX1414
AV
=
DD
E1*
V
*ONE TRANSISTOR (9V), ONE J CELL (6V), OR FOUR ALKALINE CELLS
V+
SHDN
REF
0.1µF
LBI
DGND
DV






DD
MAX640
RESET
1024
2
33µF
WU1
VFB
NB
0.1µF

 −

GND
Power Supplies
VOUT
1
LX



RESET
INPUT
2R
µP/µC
D1
V
V
DD
SS
100µH
R
0.1µF
V
DD
IN0
(+3.3V)
100µF
CPLL
20, 21, and 22 are power-supply circuits using a step-up
converter, buck-boost converter, step-down converter,
and a direct battery, respectively. Choose the correct
power-supply circuit for your specific application.
Connect the MAX1407/MAX1408/MAX1409/MAX1414
AV
latch-up performance of the MAX1407/MAX1408/
MAX1409/MAX1414 is adequate, it is important that
power is applied to the device before the analog input
signals (IN_) to avoid latch-up. If this is not possible,
limit the current flow into any of these pins to 50mA.
The MAX1407/MAX1408/MAX1409/MAX1414 family inter-
face with electrochemical sensors. The 10-bit DACs with
the force/sense buffers have the flexibility to connect to
many different types of sensors. Figure 23 shows how to
interface with a two electrode potentiostat. A single DAC
is required to set the bias across the sensor relative to
ground and an external precision resistor completes the
transimpedance amplifier configuration to convert the
current generated by the sensor to a voltage to be mea-
sured by the ADC. The induced error from this source is
negligible due to FB1’s extremely low input bias current.
Internally, the ADC can differentially measure directly
across the external transimpedance resistor, R
ing any errors due to voltages drifting over time, tempera-
ture, or supply voltage. Figure 24 shows a two electrode
potentiostat application that is driven at the working elec-
trode and measured at the counter electrode. With this
application, the DAC connected to the working electrode
is configured in unity gain and the DAC connected to the
AGND
18nF
DD
AV
MAX1407
MAX1408
MAX1409
MAX1414
and DV
DD
Electrochemical Sensor Operation
0.1µF
DGND
DD
DV
DD
power supplies together. While the
RESET
WU1
0.1µF
RESET
INPUT
µP/µC
V
V
DD
SS
0.1µF
F
, eliminat-