MAXIM MAX1226, MAX1228, MAX1230 Technical data

General Description

The MAX1226/MAX1228/MAX1230 are serial 12-bit analog-to-digital converters (ADCs) with an internal reference and an internal temperature sensor. These devices feature on-chip FIFO, scan mode, internal clock mode, internal averaging, and AutoShutdown™. The maximum sampling rate is 300ksps using an external clock. The MAX1230 has 16 input channels, the MAX1228 has 12 input channels, and the MAX1226 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 +5V supply and contain a 10MHz SPI™/QSPI™/MICROWIRE™-compatible serial port.

The MAX1230 is available in 28-pin 5mm x 5mm QFN with exposed pad and 24-pin QSOP packages. The MAX1226/MAX1228 are only available in QSOP packages. All three devices are specified over the extended

-40°C to +85°C temperature range.

________________________Applications

System Supervision

Data-Acquisition Systems

Industrial Control Systems

Patient Monitoring

Data Logging

Instrumentation

Features

♦ Internal Temperature Sensor (±1°C Accuracy) ♦ 16-Entry First-In/First-Out (FIFO) ♦ Analog Multiplexer with True Differential

Track/Hold

16-, 12-, 8-Channel Single Ended 8-, 6-, 4-Channel True Differential (Unipolar or Bipolar)

♦ Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing

Codes Over Temperature

♦ Scan Mode, Internal Averaging, and Internal Clock ♦ Low-Power Single +5V Operation

1.9mA at 300ksps

♦ Internal 4.096V Reference or External Differential

Reference

♦ 10MHz 3-Wire SPI/QSPI/MICROWIRE-Compatible

Interface

♦ Space-Saving 28-Pin 5mm x 5mm QFN Package

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-2852; Rev 1; 7/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

*Future product—contact factory for availability.

Ordering Information continued at end of data sheet.

TOP VIEW

Pin Configurations continued at end of data sheet.

AutoShutdown is a trademark of Maxim Integrated Products, Inc. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

查询MAX1226ACEE-T供应商

PART TEMP RANGE PIN-PACKAGE

MAX1226ACEE-T* 0°C to +70°C 16 QSOP

MAX1226AEEE-T* -40°C to +85°C 16 QSOP

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

REF-/AIN6

CNVST/AIN7

MAX1226

QSOP

EOC

DOUT

DIN

SCLK

GND

REF+

AIN0

AIN1

AIN2

AIN4

AIN5

AIN6

AIN8

MAX1228

QSOP

EOC

DOUT

DIN

CSAIN3

SCLK

GND

REF+AIN7

CNVST/AIN11

REF-/AIN10AIN9

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +5V ±5%, f

SAMPLE

= 300kHz, f

SCLK

= 4.8MHz (50% duty cycle), V

REF

= 4.096V, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND..............................................................-0.3V to +6V

CS, SCLK, DIN, EOC, DOUT to GND.........-0.3V to (V

+ 0.3V)

AIN0–AIN13, REF-/AIN_, CNVST/AIN_,

REF+ to GND.........................................-0.3V to (V

+ 0.3V)

Maximum Current into Any Pin............................................50mA

Continuous Power Dissipation (T

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW

24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW

28-Pin QFN 5mm x 5mm

(derate 20.8mW/°C above +70°C)........................1667mW

Operating Temperature Ranges

MAX12__C__.......................................................0°C to +70°C

MAX12__E__....................................................-40°C to +85°C

Storage Temperature Range .............................-60°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ACCURACY (Note 1)

Resolution RES 12 Bits

Integral Nonlinearity INL ±1.0 LSB

Differential Nonlinearity DNL No missing codes over temperature ±1.0 LSB

Offset Error ±0.5 ±4.0 LSB

Gain Error (Note 2) ±0.5 ±4.0 LSB

Offset Error Temperature Coefficient

Gain Temperature Coefficient ±0.8 ppm/°C

Channel-to-Channel Offset Matching

DYNAMIC SPECIFICATIONS (10kHz sine wave input, 4.096V

Signal-to-Noise Plus Distortion SINAD 70 dB

Total Harmonic Distortion THD Up to the 5th harmonic -82 dBc

Spurious-Free Dynamic Range SFDR 80 dBc

Intermodulation Distortion IMD f

Full-Power Bandwidth -3dB point 1 MHz

Full-Linear Bandwidth S / (N + D) > 68dB 25 kHz

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 9.9kHz, f

in1

, 300ksps, f

P-P

= 10.2kHz 76 dBc

in2

SCLK

= 4.8MHz)

±2

±0.1 LSB

ppm/°C

FSR

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±5%, f

SAMPLE

= 300kHz, f

SCLK

= 4.8MHz (50% duty cycle), V

REF

= 4.096V, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

= +25°C.)

CONVERSION RATE

Power-Up Time t

Acquisition Time t

Conversion Time t

External Clock Frequency f

SCLK Duty Cycle 40 60 %

Aperture Delay 30 ns

Aperture Jitter <50 ps

ANALOG INPUT

Input Voltage Range

Input Leakage Current V

Input Capacitance During acquisition time (Note 6) 24 pF

INTERNAL TEMPERATURE SENSOR

Measurement Error (Note 7)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ACQ

CONV

SCLK

External reference 0.8

Internal reference (Note 3) 65

Internally clocked 3.5

Externally clocked (Note 4) 2.7

Externally clocked conversion 0.1 4.8

Data I/O 10

Unipolar 0 V

Bipolar (Note 5) - V

= V

Grade A, TA = +25°C ±0.3

Grade A =, TA = -20°C to +85°C ±0.5 ±1

Grade A, TA = T

Grade B, TA = +25°C ±0.7

Grade B, T

= T

MIN

to T

MAX

/ 2 V

RE F

0.6 µs

REF

/ 2

RE F

±0.01 ±1 µA

±0.75 ±1.5

±1.2 ±3.0

µs

MHz

°C

Temperature Measurement Noise 0.1 °C

Temperature Resolution 1/8 °C

Power-Supply Rejection 0.3 °C/V

INTERNAL REFERENCE

REF Output Voltage 4.024 4.096 4.168 V

REF Temperature Coefficient TC

Output Resistance 6.5 kΩ

REF Output Noise 200 µV

REF Power-Supply Rejection PSRR -70 dB

EXTERNAL REFERENCE INPUT

REF- Input Voltage Range V

REF+ Input Voltage Range V

REF+ Input Current I

REF-

REF+

Grade A ±8

REF

Grade B ±30

REF+

= 4.096V, f

= 300ksps 40 100

SAMPLE

= 0 ±0.1 ±5

SAMPLE

0 500 mV

1.0 VDD + 50mV V

RMS

ppm/°C

RMS

µA

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference

4 _______________________________________________________________________________________

Note 1: Tested at VDD= +5V, unipolar input mode. Note 2: Offset nulled. Note 3: Time for reference to power up and settle to within 1 LSB. Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. Note 5: The operational input voltage range for each individual input of a differentially configured pair is from GND to V

. The

operational input voltage difference is from -V

REF

/ 2 to +V

REF

/ 2.

Note 6: See Figure 3 (Input Equivalent Circuit) and the Sampling Error vs. Source Impedance curve in the Typical Operating

Characterisitcs section.

Note 7: Fast automated test, excludes self-heating effects. Note 8: Supply current is specified depending on whether an internal or external reference is used for voltage conversions.

Temperature measurements always use the internal reference.

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V ±5%, f

SAMPLE

= 300kHz, f

SCLK

= 4.8MHz (50% duty cycle), V

REF

= 4.096V, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

= +25°C.)

DIGITAL INPUTS (SCLK, DIN, CS, CNVST)

Input Voltage Low V

Input Voltage High V

Input Hysteresis V

Input Leakage Current I

Input Capacitance C DIGITAL OUTPUTS (DOUT, EOC)

Output Voltage Low V

Output Voltage High V

Tri-State Leakage Current I

Tri-State Output Capacitance C

POWER REQUIREMENTS

Supply Voltage V

Supply Current (Note 8) I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Rejection PSR VDD = 4.75V to 5.25V; full-scale input ±0.2 ±1.2 mV

HYST

VIN = 0 or V

SINK

SOURCE

CS = V CS = V

Internal reference

External reference

= 2mA 0.4

= 4mA 0.8

= 1.5mA VDD - 0.5 V

OUT

During temp sense 2400 3100

Shutdown 0.2 5

During temp sense 1650 2300

Shutdown 0.2 5

= 300ksps 1950 2300

SAMPLE

= 0, REF on 1000 1350

SAMPLE

= 300ksps 1250 1500

SAMPLE

2.0 V

4.75 5.25 V

0.8 V

200 mV

±0.01 ±1.0 µA

15 pF

±0.05 ±1 µA

15 pF

µA

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (Figure 1)

Note 9: This time is defined as the number of clock cycles needed for conversion multiplied by the clock period. If the internal refer-

ence needs to be powered up, the total time is additive. The internal reference is always used for temperature measurements.

-1.0

-0.4

-0.6

-0.8

-0.2

0.2

0.4

0.6

0.8

1.0

0 1024 2048 3072 4096

INTEGRAL NONLINEARITY

vs. OUTPUT CODE

MAX1226/28/30 toc01

OUTPUT CODE

INTEGRAL NONLINEARITY (LSB)

-1.0

-0.4

-0.6

-0.8

-0.2

0.2

0.4

0.6

0.8

1.0

0 1024 2048 3072 4096

DIFFERENTIAL NONLINEARITY

vs. OUTPUT CODE

MAX1226/28/30 toc02

OUTPUT CODE

DIFFERENTIAL NONLINEARITY (LSB)

SINAD vs. FREQUENCY

MAX1226/28/30 toc03

FREQUENCY (kHz)

SINAD AMPLITUDE (dB)

100101

100

0.1 1000

Typical Operating Characteristics

(VDD= +5V, V

REF

= +4.096V, f

SCLK

= 4.8MHz, C

LOAD

= 30pF, TA= +25°C, unless otherwise noted.)

SCLK Clock Period t

SCLK Duty Cycle t

SCLK Fall to DOUT Transition t

CS Rise to DOUT Disable t CS Fall to DOUT Enable t

DIN to SCLK Rise Setup t

SCLK Rise to DIN Hold t CS to SCLK Rise Setup t SCLK Rise to CS Hold t

CNVST Pulse Width

CS or CNVST Rise to EOC

Low (Note 9)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DOT

DOD

DOE

CSS

CSH

CSW

Externally clocked conversion 208

Data I/O 100

40 60 %

= 30pF 40 ns

LOAD

= 30pF 40 ns

LOAD

= 30pF 40 ns

LOAD

40 ns

0ns

40 ns

0ns

CKSEL = 00, CKSEL = 01 (temp sense) 40 ns

CKSEL = 01 (voltage conversion) 1.4 µs

T S

R P

Temp sense 55

Voltage conversion 7

Reference power-up 65

µs

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= +5V, V

REF

= +4.096V, f

SCLK

= 4.8MHz, C

LOAD

= 30pF, TA= +25°C, unless otherwise noted.)

4.0494

4.0496

4.0495

4.0498

4.0497

4.0499

4.0500

4.75 4.954.85 5.05 5.15 5.25

INTERNAL REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX1226/28/30 toc10

SUPPLY VOLTAGE (V)

INTERNAL REFERENCE VOLTAGE (V)

SFDR vs. FREQUENCY

MAX1226/28/30 toc04

FREQUENCY (kHz)

SFDR AMPLITUDE (dB)

100101

100

120

0.1 1000

SUPPLY CURRENT vs. SAMPLING RATE

MAX1226/28/30 toc05

SAMPLING RATE (ksps)

SUPPLY CURRENT (µA)

10010

400

600

800

1000

1200

200

1 1000

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX1226/28/30 toc06

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.155.054.954.85

1050

1100

1150

1200

1000

4.75 5.25

0.2

0.1

0.4

0.3

0.5

0.6

4.75 4.954.85 5.05 5.15 5.25

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX1226/28/30 toc07

SUPPLY VOLTAGE (V)

SHUTDOWN SUPPLY CURRENT (µA)

SUPPLY CURRENT vs. TEMPERATURE

MAX1226/28/30 toc08

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

603510-15

1050

1100

1150

1200

1250

1300

1000

-40 85

fS = 300ksps

0.2

0.1

0.4

0.3

0.5

0.6

-40 10-15 35 60 85

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX1226/28/30 toc09

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (µA)

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(VDD= +5V, V

REF

= +4.096V, f

SCLK

= 4.8MHz, C

LOAD

= 30pF, TA= +25°C, unless otherwise noted.)

-1.00

-0.50

0.50

0.25

-0.25

-0.75

1.00

0.75

TEMPERATURE SENSOR ERROR

vs. TEMPERATURE

MAX1226/28/30 toc16

TEMPERATURE (°C)

TEMPERATURE SENSOR ERROR (°C)

-40 -15 35 85

6010

GRADE A

GRADE B

-10

-6

-8

-2

-4

0426810

SAMPLING ERROR

vs. SOURCE IMPEDANCE

MAX1226/28/30 toc17

SOURCE IMPEDANCE (kΩ)

SAMPLING ERROR (LSB)

INTERNAL REFERENCE VOLTAGE

vs. TEMPERATURE

4.051

4.050

4.049

4.048

INTERNAL REFERENCE VOLTAGE (V)

4.047

-40 10-15 35 60 85 TEMPERATURE (°C)

GAIN ERROR vs. SUPPLY VOLTAGE

0.5

MAX1226/28/30 toc11

OFFSET ERROR

vs. SUPPLY VOLTAGE

0.3

0.2

0.1

-0.1

OFFSET ERROR (LSB)

-0.2

-0.3

4.75 4.954.85 5.05 5.15 5.25 SUPPLY VOLTAGE (V)

0.5

MAX1226/28/30 toc14

0.3

0.2

MAX1226/28/30 toc12

0.1

-0.1

OFFSET ERROR (LSB)

-0.2

-0.3

-40 10-15 35 60 85

GAIN ERROR vs. TEMPERATURE

OFFSET ERROR

vs. TEMPERATURE

TEMPERATURE (°C)

MAX1226/28/30 toc15

MAX1226/28/30 toc13

-0.5

GAIN ERROR (LSB)

-1.0

-1.5

4.75 4.85 5.05 5.25 SUPPLY VOLTAGE (V)

-0.5

GAIN ERROR (LSB)

-1.0

-1.5

5.154.95

-40 -15 35 85 TEMPERATURE (°C)

6010

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference

8 _______________________________________________________________________________________

Pin Description

MAX1230

QFN

1, 17, 19, 25

2–12, 26,

27, 28

——1–10 — AIN0–9 Analog Inputs

———1–6AIN0–5 Analog Inputs

13 15 ——REF-/AIN14

——11 — REF-/AIN10

——— 7 REF-/AIN6

14 16 ——

——12 —

——— 8

15 17 13 9 REF+ Positive Reference Input. Bypass to GND with a 0.1µF capacitor.

16 18 14 10 GND Ground

18 19 15 11 V

20 20 16 12 SCLK

MAX1230

QSOP

———N.C. No Connection. Not internally connected.

1–14 ——AIN0–13 Analog Inputs

MAX1228 MAX1226 NAME FUNCTION

Negative Input for External Differential Reference/Analog Input 14. See Table 3 for details on programming the setup register.

Negative Input for External Differential Reference/Analog Input 10. See Table 3 for details on programming the setup register.

Negative Input for External Differential Reference/Analog Input 6. See Table 3 for details on programming the setup register.

CNVST/

AIN15

CNVST/

AIN11

CNVST/

AIN7

Active-Low Conversion Start Input/Analog Input 15. See Table 3 for details on programming the setup register.

Active-Low Conversion Start Input/Analog Input 11. See Table 3 for details on programming the setup register.

Active-Low Conversion Start Input/Analog Input 7. See Table 3 for details on programming the setup register.

Power Input. Bypass to GND with a 0.1µF capacitor.

Serial Clock Input. Clocks data in and out of the serial interface. (Duty cycle must be 40% to 60%.) See Table 3 for details on programming the clock mode.

21 21 17 13 CS

22 22 18 14 DIN

23 23 19 15 DOUT

24 24 20 16 EOC End of Conversion Output. Data is valid after EOC pulls low.

Active-Low Chip-Select Input. When CS is low, the serial interface is enabled. When CS is high, DOUT is high impedance.

Serial Data Input. DIN data is latched into the serial interface on the rising edge of SCLK.

Serial Data Output. Data is clocked out on the falling edge of SCLK. High impedance when CS is connected to V

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