MAXIM MAX1132, MAX1133 User Manual

General Description

The MAX1132/MAX1133 are 200ksps, 16-bit ADCs. These serially interfaced ADCs connect directly to SPI™, QSPI™, and MICROWIRE™ devices without external logic. They combine an input scaling network, internal track/hold, clock, a +4.096V reference, and three general-purpose digital output pins (for external multiplexer or PGA control) in a 20-pin SSOP package. The excellent dynamic performance (SINAD ≥ 85dB), high-speed (200ksps), and low power (7.5mA) of these ADCs, make them ideal for applications such as industrial process control, instrumentation, and medical applications. The MAX1132 accepts input signals of 0 to +12V (unipolar) or ±12V (bipolar), while the MAX1133 accepts input signals of 0 to +4.096V (unipolar) or ±4.096V (bipolar). Operating from a single +4.75V to +5.25V analog supply and a +4.75V to +5.25V digital supply, power-down modes reduce current consumption to 1mA at 10ksps and further reduce supply current to less than 20µA at slower data rates. A serial strobe output (SSTRB) allows direct connection to the TMS320 family of digital signal processors. The MAX1132/MAX1133 user can select either the internal clock, or an external serial-interface clock for the ADC to perform analog-to-digital conversions.

The MAX1132/MAX1133 feature internal calibration circuitry to correct linearity and offset errors. On-demand calibration allows the user to optimize performance. Three user-programmable logic outputs are provided for the control of an 8-channel mux or a PGA.

Applications

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Medical Instruments

Portable and Battery-Powered Equipment

Features

♦ 200ksps (Bipolar) and 150ksps (Unipolar)

Sampling ADC

♦ 16-Bits, No Missing Codes

♦ 1.5LSB INL Guaranteed

♦ 85dB (min) SINAD

♦ +5V Single-Supply Operation

♦ Low-Power Operation, 7.5mA (Unipolar Mode)

♦ 2.5µA Shutdown Mode

♦ Software-Configurable Unipolar and Bipolar Input

Ranges

0 to +12V and ±12V (MAX1132) 0 to +4.096V and ±4.096V (MAX1133) Internal or External Reference

♦ Internal or External Clock

♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface

♦ Three User-Programmable Logic Outputs

♦ Small 20-Pin SSOP Package

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply

with Reference

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-2083; Rev 0; 8/01

EVALUATION KIT

AVAILABLE

Ordering Information

)

Functional Diagram appears at end of data sheet. Typical Application Circuit appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

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.

PART TEMP. RANGE PIN-PACKAGE

MAX1132ACAP* 0°C to +70°C 20 SSOP ±1.5

MAX1132BCAP 0°C to +70°C 20 SSOP ±2.5

INL

(LSB

TOP VIEW

REF

REFADJ

AGND

DGND

SHDN

SSTRB

MAX1132

MAX1133

10 DOUT

SSOP

AIN

AGND

CREF

DIN

DGND

SCLK

RST

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply with Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

AVDDto AGND, DVDDto DGND .............................-0.3V to +6V

AGND to DGND.....................................................-0.3V to +0.3V

AIN to AGND.....................................................................±16.5V

REFADJ, CREF, REF to AGND.................-0.3V to (AV

+ 0.3V)

Digital Inputs to DGND.............................................-0.3V to +6V

Digital Outputs to DGND .........................-0.3V to (DV

+ 0.3V) Continuous Power Dissipation (T

= +70°C)

20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW

Operating Temperature Ranges

MAX113_CAP ......................................................0°C to +70°C

MAX113_EAP....................................................-40°C to +85°C

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

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

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

ELECTRICAL CHARACTERISTICS

(AVDD= DVDD= +5V ±5%, f

SCLK

= 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external

REF

= +4.096V, V

REFADJ

= AVDD, C

REF

= 2.2µF, C

CREF

= 1µF, TA = T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC ACCURACY (Note 1)

Resolution 16 Bits

Relative Accuracy (Note 2) INL Bipolar mode

No Missing Codes 16 Bits

Differential Nonlinearity DNL Bipolar mode

Transition Noise 0.77 LSB

Offset Error

Gain Error (Note 3)

Offset D r i ft ( Bi p ol ar and U ni p ol ar ) Excluding reference drift ±1 ppm/oC

G ai n D r i ft ( Bi p ol ar and U ni p ol ar ) Excluding reference drift ±1 ppm/oC

DYNAMIC SPECIFICATIONS (5kHz sine-wave input, 200ksps, 4.8MHz clock, bipolar input mode. MAX1132: 24Vp-p. MAX1133: 8.192Vp-p)

SINAD

SNR

THD

SFDR

Unipolar

Bipolar

Unipolar ±0.2

Bipolar ±0.3

= 5kHz 85

= 100kHz 85

= 5kHz 87

= 100kHz 92

= 5kHz -90

= 100kHz -92

= 5kHz 92

= 100kHz 96

MAX113_A ±1.5

MAX113_B ±2.5

MAX113_A -1 +1

MAX113_B -1 +1.75

MAX1132 ±4

MAX1133 ±2

MAX1132 ±6

MAX1133 ±5

LSB

RMS

%FSR

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply

with Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5V ±5%, f

SCLK

= 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external

REF

= +4.096V, V

REFADJ

= AVDD, C

REF

= 2.2µF, C

CREF

= 1µF, TA = T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG INPUT

Input Range

Input Impedance

Input Capacitance 32 pF

CONVERSION RATE

Internal Clock Frequency 4 MHz

Aperture Delay t

Aperture Jitter t

MODE 1 (24 External Clock Cycles per Conversion)

External Clock Frequency f

Sample Rate fS = f

Conversion Time (Note 4)

MODE 2 (Internal Clock Mode)

External Clock Frequency (Data Transfer Only)

Conversion Time SSTRB low pulse width 4 6 µs

Acquisition Time

MODE 3 (32 External Clock Cycles per Conversion)

External Clock Frequency f

Sample Rate fS = f

Conversion Time (Note 4)

INTERNAL REFERENCE

Output Voltage V

REF Short-Circuit Current 24 mA

Output Tempco ±20 ppm/oC

SCLK

/24

SCLK

CONV+ACQ

24 / f

CONV+ACQ

32 / f

SCLK Bipolar 5 240

SCLK

/32 Unipolar or bipolar 3.125 150 ksps

SCLK

REF

MAX1132

MAX1133

MAX1132

MAX1133

Unipolar 0.1 3

Bipolar 0.1 4.8

Unipolar 4.17 125

Bipolar 4.17 200

Unipolar 8 240

Unipolar 1.82

Bipolar 1.14

Unipolar or bipolar 0.1 4.8 MHz

Unipolar or bipolar 6.67 320 µs

Unipolar 0 12

Bipolar -12 12

Unipolar 0 4.096

Bipolar - 4.096 4.096

Unipolar 7.5 10.0

Bipolar 5.9 7.9

Unipolar 100 1000

Bipolar 3.4 4.5

4.056 4.096 4.136 V

10 ns

50 ps

8 MHz

kΩ

MHz

ksps

µs

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply with Reference

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= DVDD= +5V ±5%, f

SCLK

= 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external

REF

= +4.096V, V

REFADJ

= AVDD, C

REF

= 2.2µF, C

CREF

= 1µF, TA = T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Capacitive Bypass at REF 0.47 10 µF

Maximum Capacitive Bypass at REFADJ

REFADJ Output Voltage 4.096 V

REFADJ Input Range For small adjustments from 4.096V ±100 mV

REFADJ Buffer Disable Threshold

Buffer Voltage Gain 1 V/V

EXTERNAL REFERENCE (Reference buffer disabled. Reference applied to REF)

Input Range (Notes 5 and 6) 3.0 4.096 4.2 V

DIGITAL INPUTS

Input High Voltage V

Input Low Voltage V

Input Leakage I

Input Hysteresis V

Input Capacitance C

DIGITAL OUTPUTS

Output High Voltage V

Output Low Voltage V

Three-State Leakage Current I

Three-State Output Capacitance

POWER SUPPLIES

Analog Supply (Note 7) AV

Digital Supply (Note 7) DV

Analog Supply Current I

Digital Supply Current I

Power-Supply Rejection Ratio (Note 8)

10 µF

HYST

To power-down the internal reference

= 4.096V, f

REF

= 4.096V, f

REF

In power-down, f

= 4.8MHz 250

SCLK

= 0 230Input Current

SCLK

= 0 0.1

SCLK

D D

0.5V

2.4 V

VIN = 0 or DV

SOURCE

= 5mA 0.4

SINK

= 16mA 0.8

SINK

CS = DV

= 0.5mA

0.5

4.75 5 5.25 V

0.2 V

10 pF

Unipolar mode 5 8

ANALOG

DIGITAL

PSRR AV

Bipolar mode 8.5 11 SHDN = 0, or softw are power -down mode

0.3 10 µA

Unipolar or bipolar mode 2.5 3.5 mA SHDN = 0, or softw are power -down mode

= DVDD = 4.75V to 5.25V 72 dB

2.2 10 µA

D D

0.1V

µA

0.8 V

±1 µA

±10 µA

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply

with Reference

_______________________________________________________________________________________ 5

Note 1: Tested at AV

= DV

= +5V, bipolar input mode.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and offset

error have been nulled.

Note 3: Offset nulled. Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period, clock has 50% duty cycle.

Includes the acquisition time.

Note 5: ADC performance is limited by the converter’s noise floor, typically 300µVp-p. Note 6: When an external reference has a different voltage than the specified typical value, the full scale of the ADC will scale

proportionally.

Note 7: Electrical characteristics are guaranteed from AV

DD(MIN)

= DV

DD(MIN)

to AV

DD(MAX)

= DV

DD(MAX)

. For operations beyond

this range, see the Typical Operating Characteristics. For guaranteed specifications beyond the limits, contact the factory.

Note 8: Defined as the change in positive full scale caused by a ±5% variation in the nominal supply voltage.

TIMING CHARACTERISTICS (Figures 5 and 6)

(AVDD= DVDD= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Acquisition Time t

DIN to SCLK Setup t

DIN to SCLK Hold t

SCLK to DOUT Valid t

CS Fall to DOUT Enable t CS Rise to DOUT Disable t CS to SCLK Rise Setup t CS to SCLK Rise Hold t

SCLK High Pulse Width t

SCLK Low Pulse Width t

SCLK Fall to SSTRB t

CS Fall to SSTRB Enable t CS Rise to SSTRB Disable t

SSTRB Rise to SCLK Rise t RST Pulse Width t

ACQ

CSS

CSH

SSTRB

SDV

STR

SCK

LOAD

Internal clock mode 0 ns

= 50pF 80 ns

= 50pF, external clock mode 80 ns

1.14 µs

50 ns

0ns

70 ns

100 ns

0ns

80 ns

208 ns

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply with Reference

6 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX1132/MAX1133: AVDD= DVDD= +5V , f

SCLK

= 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps),

bipolar input, external REF = +4.096V, 0.22µF bypassing on REFADJ, 2.2µF on REF, 1µF on CREF, TA= 25°C, unless otherwise noted.)

-1.5

-1.0

-0.5

0.5

1.0

1.5

1 13729

6865 20593

27457

34321

41185

48049

54913

61777

INTEGRAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MAX1132 toc01

DIGITAL OUTPUT CODE

INTEGRAL NONLINEARITY (LSB)

-1.0

-0.6

-0.8

-0.2

-0.4

0.2

0.4

0.8

0.6

1.0

1 13729

20593

27457

6865 34321

41185

48049

54913

61777

DIFFERENTIAL NONLINEARITY

vs. DIGITAL OUTPUT CODE

MAX1132 toc02

DIGITAL OUTPUT CODE

DIFFERENTIAL NONLINEARITY (LSB)

9.5

10.1

9.9

9.7

10.5

10.3

11.3

11.1

10.9

10.7

11.5

-40

-20

20 40 60 80

TOTAL SUPPLY CURRENT

vs. TEMPERATURE

MAX1132 toc03

TEMPERATURE (°C)

TOTAL SUPPLY CURRENT (mA)

A: AVDD, DVDD = +4.75V B: AV

, DVDD = +5.00V

C: AV

, DVDD = +5.25V

-4

-3

-2

-1

OFFSET VOLTAGE vs. TEMPERATURE

MAX1132 toc04

TEMPERATURE (°C)

OFFSET VOLTAGE (mV)

-40 20 40-20 0 60 80

A: AVDD, DVDD = +4.75V B: AV

, DVDD = +5.00V

C: AV

, DVDD = +5.25V

0.01

0.02

0.03

0.04

GAIN ERROR vs. TEMPERATURE

MAX1132 toc05

TEMPERATURE (°C)

GAIN ERROR (% FULL SCALE)

-40 20 40-20 0 60 80

A: AVDD, DVDD = +4.75V B: AV

, DVDD = +5.00V

C: AV

, DVDD = +5.25V

100

1.00

0.10

0.01 0101 100 1000

TOTAL SUPPLY CURRENT vs.

CONVERSION RATE (USING SHUTDOWN)

MAX1132 toc06

CONVERSION RATE (ksps)

TOTAL SUPPLY CURRENT (mA)

0.990

0.995

1.000

1.005

1.010

NORMALIZED REF VOLTAGE

vs. TEMPERATURE

MAX1132 toc07

TEMPERATURE (°C)

NORMALIZED REF VOLTAGE (V)

-40 20 40-20 0 60 80

-120

-100

-80

-40

-60

-20

0189 273645546372 819099

FFT PLOT

MAX1132 toc08

FREQUENCY (kHz)

AMPLITUDE (dB)

SAMPLE

= 200kHz

= 5kHz

0.1 100101

SINAD PLOT

100

MAX1132 toc09

FREQUENCY (kHz)

AMPLITUDE (dB)

SAMPLE

= 200kHz

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