MAX1231EVKIT Maxim Integrated Products, MAX1231EVKIT Datasheet

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MAX1231EVKIT

Manufacturer Part Number
MAX1231EVKIT
Description
EVAL KIT FOR MAX1231
Manufacturer
Maxim Integrated Products
Datasheets

Specifications of MAX1231EVKIT

Number Of Adc's
1
Number Of Bits
12
Sampling Rate (per Second)
300k
Data Interface
Serial
Inputs Per Adc
16 Single Ended or 8 Differential
Input Range
±VREF/2
Power (typ) @ Conditions
1.86mW @ 300kSPS
Voltage Supply Source
Single Supply
Operating Temperature
0°C ~ 70°C
Utilized Ic / Part
MAX1231
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1227/MAX1229/MAX1231 are serial 12-bit ana-
log-to-digital converters (ADCs) with an internal reference
and an internal temperature sensor. These devices fea-
ture an on-chip FIFO, scan mode, internal clock mode,
internal averaging, and AutoShutdown™. The maximum
sampling rate is 300ksps using an external clock. The
MAX1231 has 16 input channels, the MAX1229 has 12
input channels, and the MAX1227 has 8 input channels.
All input channels are configurable for single-ended or
differential inputs in unipolar or bipolar mode. All three
devices operate from a +3V supply and contain a 10MHz
SPI™-/QSPI™-/MICROWIRE™-compatible serial port.
The MAX1231 is available in 28-pin 5mm x 5mm TQFN
with exposed pad and 24-pin QSOP packages. The
MAX1227/MAX1229 are only available in QSOP pack-
ages. All three devices are specified over the extended
-40°C to +85°C temperature range.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
19-2851; Rev 5; 12/10
________________________Applications
Pin Configurations continued at end of data sheet.
TOP VIEW
System Supervision
Data-Acquisition Systems
Industrial Control Systems
Patient Monitoring
Data Logging
Instrumentation
CNVST/AIN7
REF-/AIN6
________________________________________________________________ Maxim Integrated Products
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
1
2
3
4
5
6
7
8
General Description
+
MAX1227
QSOP
Temp Sensor, Internal Reference
12-Bit 300ksps ADCs with FIFO,
16
15
14
13
12
11
10
9
EOC
DOUT
DIN
CS
SCLK
V
GND
REF+
DD
♦ Internal Temperature Sensor (±0.7°C Accuracy)
♦ 16-Entry First-In/First-Out (FIFO)
♦ Analog Multiplexer with True Differential
♦ Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing
♦ Scan Mode, Internal Averaging, and Internal Clock
♦ Low-Power Single +3V Operation
♦ Internal 2.5V Reference or External Differential
♦ 10MHz 3-Wire SPI-/QSPI-/MICROWIRE-Compatible
♦ Space-Saving 28-Pin 5mm x 5mm TQFN Package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad (TQFN only). Connect to GND.
Ordering Information continued at end of data sheet.
MAX1231BCEG+
MAX1231BEEG+
MAX1231BCTI+
MAX1231BETI+
Track/Hold
Codes Overtemperature
Reference
Interface
16-, 12-, 8-Channel Single Ended
8-, 6-, 4-Channel True Differential
(Unipolar or Bipolar)
1mA at 300ksps
PART
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
10
1
2
3
4
5
6
7
8
9
+
-40°C to +85°C
-40°C to +85°C
MAX1229
TEMP RANGE
0°C to +70°C
0°C to +70°C
Ordering Information
QSOP
Pin Configurations
20
19
18
17
16
15
14
13
12
11
EOC
DOUT
DIN
CS
SCLK
V
GND
REF+
CNVST/AIN11
REF-/AIN10
DD
PIN-PACKAGE
24 QSOP
24 QSOP
28 TQFN-EP*
28 TQFN-EP*
Features
1

Related parts for MAX1231EVKIT

MAX1231EVKIT Summary of contents

Page 1

... System Supervision Data-Acquisition Systems Industrial Control Systems Patient Monitoring Data Logging Instrumentation AutoShutdown is a trademark of Maxim Integrated Products, Inc. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. TOP VIEW + AIN0 1 AIN1 ...

Page 2

ADCs with FIFO, Temp Sensor, Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD CS, SCLK, DIN, EOC, DOUT to GND.........-0. AIN0–AIN13, REF-/AIN_, CNVST/AIN_, REF+ to GND.........................................-0. Maximum Current into Any ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V 300kHz SAMPLE noted. Typical values are +25°C.) A PARAMETER SYMBOL CONVERSION RATE Power-Up Time Acquisition Time Conversion Time t External Clock Frequency SCLK Duty Cycle ...

Page 4

ADCs with FIFO, Temp Sensor, Internal Reference ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V 300kHz SAMPLE noted. Typical values are +25°C.) A PARAMETER SYMBOL DIGITAL INPUTS (SCLK, DIN, CS, CNVST) ...

Page 5

TIMING CHARACTERISTICS (Figure 1) PARAMETER SYMBOL SCLK Clock Period SCLK Duty Cycle SCLK Fall to DOUT Transition CS Rise to DOUT Disable CS Fall to DOUT Enable DIN to SCLK Rise Setup SCLK Rise to DIN Hold ...

Page 6

ADCs with FIFO, Temp Sensor, Internal Reference (V = +3V +2.5V 4.8MHz REF SCLK SFDR vs. FREQUENCY 120 100 0 100 1000 FREQUENCY (kHz) SHUTDOWN ...

Page 7

V = +2.5V 4.8MHz REF SCLK INTERNAL REFERENCE VOLTAGE vs. TEMPERATURE 2.510 2.506 2.502 2.498 2.494 2.490 -40 - TEMPERATURE (°C) GAIN ERROR vs. SUPPLY VOLTAGE 2.0 1.5 1.0 0.5 ...

Page 8

ADCs with FIFO, Temp Sensor, Internal Reference MAX1231 MAX1231 MAX1229 MAX1227 TQFN-EP QSOP 2–12, 26, 1–14 — 27, 28, — — 1–10 — — — — — — 11 — — — — — ...

Page 9

CS t CSS0 SCLK DIN t DOE DOUT Figure 1. Detailed Serial-Interface Timing Diagram CS DIN SCLK CNVST AIN1 AIN2 AIN15 REF- REF+ Figure 2. Functional Diagram Detailed Description The MAX1227/MAX1229/MAX1231 are low-power, seri- al-output, multichannel ...

Page 10

ADCs with FIFO, Temp Sensor, Internal Reference Converter Operation The MAX1227/MAX1229/MAX1231 ADCs use a fully dif- ferential, successive-approximation register (SAR) con- version technique and an on-chip T/H block to convert temperature and voltage signals into a 12-bit digital ...

Page 11

REF AIN0-AIN15 DAC GND (SINGLE ENDED); AIN0, AIN2, AIN4…AIN14 CIN+ (DIFFERENTIAL) HOLD GND CIN- (SINGLE ENDED); AIN1, AIN3, AIN5…AIN15 HOLD (DIFFERENTIAL Figure 3. Equivalent Input Circuit Address the unipolar and bipolar registers through the setup register (bits ...

Page 12

ADCs with FIFO, Temp Sensor, Internal Reference Applications Information Register Descriptions The MAX1227/MAX1229/MAX1231 communicate between the internal registers and the external circuitry through the SPI-/QSPI-compatible serial interface. Table 1 details the registers and the bit names. Tables 2–7 ...

Page 13

Table 2. Conversion Register BIT BIT FUNCTION NAME — 7 (MSB) Set select conversion register. CHSEL3 6 Analog input channel select. CHSEL2 5 Analog input channel select. CHSEL1 4 Analog input channel select. CHSEL0 3 Analog input ...

Page 14

ADCs with FIFO, Temp Sensor, Internal Reference Table 3. Setup Register BIT NAME BIT — 7 (MSB) Set to zero to select setup register. — 6 Set select setup register. Clock mode and CNVST configuration. ...

Page 15

Temperature Measurements The MAX1227/MAX1229/MAX1231 perform tempera- ture measurements with an internal diode-connected transistor. The diode bias current changes from 68µA to 4µA to produce a temperature-dependent bias volt- age difference. The second conversion result at 4µA is subtracted from the ...

Page 16

ADCs with FIFO, Temp Sensor, Internal Reference Table 6. Averaging Register BIT NAME BIT — 7 (MSB) Set to zero to select averaging register. — 6 Set to zero to select averaging register. — 5 Set to 1 ...

Page 17

Internally Timed Acquisitions and Conversions Using CNVST Performing Conversions in Clock Mode 00 In clock mode 00, the wake-up, acquisition, conversion, and shutdown sequences are initiated through CNVST and performed automatically using the internal oscilla- tor. Results are added to ...

Page 18

ADCs with FIFO, Temp Sensor, Internal Reference CNVST (ACQUISITION1) (ACQUISITION2) CS (CONVERSION1) SCLK DOUT EOC REQUEST MULTIPLE CONVERSIONS BY SETTING CNVST LOW FOR EACH CONVERSION. Figure 5. Clock Mode 01 (CONVERSION BYTE) DIN CS SCLK DOUT EOC THE ...

Page 19

DIN (ACQUISITION1) CS SCLK DOUT EOC EXTERNALLY TIMED ACQUISITION, SAMPLING AND CONVERSION WITHOUT CNVST. Figure 7. Clock Mode 11 Externally Clocked Acquisitions and Conversions Using the Serial Interface Performing Conversions in Clock Mode 11 In clock mode 11, acquisitions and ...

Page 20

ADCs with FIFO, Temp Sensor, Internal Reference OUTPUT CODE FULL-SCALE TRANSITION 111 110 101 ...

Page 21

TOP VIEW + AIN0 1 AIN1 2 AIN2 3 AIN3 4 MAX1231 AIN4 5 AIN5 6 AIN6 7 AIN7 8 AIN8 9 AIN9 10 AIN10 11 AIN11 12 QSOP Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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