Maxim MAX189CEPA, MAX189CCWE, MAX189CCPA, MAX189BMJA, MAX189BCWE Datasheet

...
0 (0)

19-0196; Rev 0; 10/93

 

 

KIT

MANUAL

 

SHEET

EVALUATION

 

DATA

 

FOLLOWS

 

 

+5V, Low-Power, 12-Bit Serial ADCs

__________________General Description

The MAX187/MAX189 serial 12-bit analog-to-digital converters (ADCs) operate from a single +5V supply and accept a 0V to 5V analog input. Both parts feature an 8.5µs successive-approximation ADC, a fast track/hold (1.5µs), an on-chip clock, and a high-speed 3-wire serial interface.

The MAX187/MAX189 digitize signals at a 75ksps throughput rate. An external clock accesses data from the interface, which communicates without external hardware to most digital signal processors and microcontrollers. The interface is compatible with SPI™, QSPI™, and Microwire™.

The MAX187 has an on-chip buffered reference, and the MAX189 requires an external reference. Both the MAX187 and MAX189 save space with 8-pin DIP and 16-pin SO packages. Power consumption is 7.5mW and reduces to only 10µW in shutdown.

Excellent AC characteristics and very low power consumption combined with ease of use and small package size make these converters ideal for remote DSP and sensor applications, or for circuits where power consumption and space are crucial.

___________________________Applications

Portable Data Logging

Remote Digital Signal Processing

Isolated Data Acquisition

High-Accuracy Process Control

________________Functional Diagram

________________________________Features

12-Bit Resolution

± 12 LSB Integral Nonlinearity (MAX187A/MAX189A)

Internal Track/Hold, 75kHz Sampling Rate

Single +5V Operation

Low Power: 2µA Shutdown Current

1.5mA Operating Current

Internal 4.096V Buffered Reference (MAX187)

3-Wire Serial Interface, Compatible with SPI, QSPI, and Microwire

Small-Footprint 8-Pin DIP and 16-Pin SO

_________________Ordering Information

PART

TEMP. RANGE PIN-PACKAGE

ERROR

 

 

 

(LSB)

MAX187ACPA

0°C to +70°C

8 Plastic DIP

±12

 

MAX187BCPA

0°C to +70°C

8 Plastic DIP

±1

 

 

 

 

 

 

MAX187CCPA

0°C to +70°C

8 Plastic DIP

±2

 

 

 

 

 

 

MAX187ACWE

0°C to +70°C

16 Wide SO

±12

MAX187BCWE

0°C to +70°C

16 Wide SO

±1

 

 

 

 

 

 

MAX187CCWE

0°C to +70°C

16 Wide SO

±2

 

 

 

 

 

 

MAX187BC/D

0°C to +70°C

Dice*

±1

 

 

 

 

 

 

Ordering Information continued on last page.

*Dice are specified at TA = +25°C, DC parameters only.

**Contact factory for availability and processing to MIL-STD-883.

_________________Pin Configurations

 

 

 

 

 

 

6

TOP VIEW

 

 

 

 

GND5

 

 

 

OUTPUT

8 DOUT

 

 

 

 

 

 

 

REF-

SHIFT

SCLK

 

 

 

 

 

 

 

 

AV = 1.638

DAC

REGISTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10k

 

 

 

 

 

 

 

 

 

 

 

(4.096V)

 

 

VDD

1

 

8

SCLK

 

 

+2.5V

 

 

 

 

 

 

BANDGAP

 

REF+

 

 

 

 

 

 

 

 

 

 

 

 

 

AIN

2

 

7

CS

 

 

REFERENCE

 

 

12-BIT

 

MAX187

 

4

(MAX187 ONLY)

 

 

 

SHDN

3

6

DOUT

REF

 

 

SAR

 

MAX189

 

 

 

 

 

 

 

 

 

 

 

REF

4

 

5

GND

AIN2

 

 

 

 

 

 

T/H

 

 

 

 

 

 

 

 

 

 

 

 

 

COMPARATOR

7

 

 

DIP

 

 

 

 

MAX187

 

 

 

 

 

 

 

 

 

BUFFER ENABLE/DISABLE

CONTROL

CS

 

 

 

 

 

 

 

MAX189

 

 

 

 

 

 

 

 

 

 

AND

3

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

VDD

 

 

 

TIMING

 

 

 

 

 

 

 

 

 

 

SHDN

 

 

 

 

 

NOTE: PIN NUMBERS SHOWN ARE FOR 8-PIN DIPs ONLY.

Pin Configurations continued on last page.

™ SPI and QSPI are trademarks of Motorola. Microwire is a trademark of National Semiconductor.

________________________________________________________________ Maxim Integrated Products 1

MAX187/MAX189

Call toll free 1-800-998-8800 for free samples or literature.

+5V, Low-Power, 12-Bit Serial ADCs

MAX187/MAX189

ABSOLUTE MAXIMUM RATINGS

VDD to GND .............................................................

-0.3V to +6V

AIN to GND................................................

-0.3V to (VDD + 0.3V)

REF to GND ...............................................

-0.3V to (VDD + 0.3V)

Digital Inputs to GND.................................

-0.3V to (VDD + 0.3V)

Digital Outputs to GND..............................

-0.3V to (VDD + 0.3V)

SHDN to GND.............................................

-0.3V to (VDD + 0.3V)

REF Load Current (MAX187) .........................

4.0mA Continuous

REF Short-Circuit Duration (MAX187)................................

20sec

DOUT Current..................................................................

±20mA

Continuous Power Dissipation (TA = +70°C)

 

 

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)

..500mW

16-Pin Wide SO (derate 8.70mW/°C above +70°C) ...

478mW

8-Pin CERDIP (derate 8.00mW/°C above +70°C) ......

440mW

Operating Temperature Ranges:

 

 

MAX187_C_ _/MAX189_C_ _.............................

0°C to +70°C

MAX187_E_ _/MAX189_E_ _ ..........................

-40°C to +85°C

MAX187_MJA/MAX189_MJA .......................

-55°C to +125°C

Storage Temperature Range............................

-60°C to +150°C

Lead Temperature (soldering, 10sec)............................

 

+300°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.

ELECTRICAL CHARACTERISTICS

(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, external clock (50% duty cycle); MAX187—internal reference: VREF = 4.096V, 4.7µF capacitor at REF pin, or MAX189—external reference: VREF = 4.096V applied to REF pin, 4.7µF capacitor at REF pin; TA = TMIN to TMAX; unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

DC ACCURACY (Note 1)

 

 

 

 

 

 

 

 

 

 

 

 

 

Resolution

 

 

 

 

12

Bits

 

 

 

 

 

 

 

 

 

MAX18_A

 

 

±12

 

Relative Accuracy (Note 2)

 

MAX18_B

 

 

±1

LSB

 

 

 

 

 

 

 

 

 

MAX18_C

 

 

±2

 

 

 

 

 

 

 

 

Differential Nonlinearity

DNL

No missing codes over temperature

 

 

±1

LSB

 

 

 

 

 

 

 

Offset Error

 

MAX18_A

 

 

±112

LSB

 

MAX18_B/C

 

 

±3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX187

 

 

±3

 

Gain Error (Note 3)

 

 

 

 

 

LSB

 

MAX189A

 

 

±1

 

 

 

 

 

 

 

 

 

MAX189B/C

 

 

±3

 

 

 

 

 

 

 

 

Gain Temperature Coefficient

 

External reference, 4.096V

 

±0.8

 

ppm/°C

 

 

 

 

 

 

 

DYNAMIC SPECIFICATIONS (10kHz sine wave input, 0V to 4.096Vp-p, 75ksps)

 

 

 

 

Signal-to-Noise plus

SINAD

 

70

 

 

dB

Distortion Ratio

 

 

 

 

 

 

 

 

 

Total Harmonic Distortion

THD

 

 

 

-80

dB

(up to the 5th harmonic)

 

 

 

 

 

 

 

 

 

Spurious-Free Dynamic Range

SFDR

 

80

 

 

dB

 

 

 

 

 

 

 

Small-Signal Bandwidth

 

Rolloff -3dB

 

4.5

 

MHz

 

 

 

 

 

 

 

Full-Power Bandwidth

 

 

 

0.8

 

MHz

 

 

 

 

 

 

 

2 _______________________________________________________________________________________

+5V, Low-Power, 12-Bit Serial ADCs

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, external clock (50% duty cycle); MAX187—internal reference: VREF = 4.096V, 4.7µF capacitor at REF pin, or MAX189—external reference: VREF = 4.096V applied to REF pin, 4.7µF capacitor at REF pin; TA = TMIN to TMAX; unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

CONVERSION RATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conversion Time

tCONV

 

 

 

5.5

 

8.5

µs

Track/Hold Acquisition Time

tACQ

 

 

 

1.5

 

 

µs

Throughput Rate

 

External clock, 4MHz, 13 clocks

 

 

75

ksps

 

 

 

 

 

 

 

 

 

Aperture Delay

tAPR

 

 

 

 

10

 

ns

Aperture Jitter

 

 

 

 

 

<50

 

ps

 

 

 

 

 

 

 

 

 

ANALOG INPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Voltage Range

 

 

 

 

 

 

0 to VREF

V

Input Capacitance (Note 4)

 

 

 

 

 

16

 

pF

 

 

 

 

 

 

 

 

 

INTERNAL REFERENCE (MAX187 only, reference buffer enabled)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TA = +25°C

 

 

4.076

4.096

4.116

 

REF Output Voltage

VREF

 

 

MAX187_C

4.060

 

4.132

 

 

 

 

 

 

 

V

TA = TMIN to TMAX

 

MAX187_E

4.050

 

4.140

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX187_M

4.040

 

4.150

 

REF Short-Circuit Current

 

 

 

 

 

 

30

mA

 

 

 

 

 

 

 

 

 

 

 

MAX187AC/BC

 

 

±30

±50

 

 

 

 

 

 

 

 

 

 

REF Tempco

 

MAX187AE/BE

 

 

±30

±60

ppm/°C

 

 

 

 

 

 

 

 

MAX187AM/BM

 

 

±30

±80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX187C

 

 

±30

 

 

 

 

 

 

 

 

 

 

 

Load Regulation (Note 5)

 

0mA to 0.6mA output load

 

 

1

 

mV

 

 

 

 

 

 

 

 

 

EXTERNAL REFERENCE AT REF (Buffer disabled, VREF = 4.096V)

 

 

 

 

 

Input Voltage Range

 

 

 

 

2.50

 

VDD + 50mV

V

Input Current

 

 

 

 

 

200

350

µA

 

 

 

 

 

 

 

 

 

Input Resistance

 

 

 

 

12

20

 

 

 

 

 

 

 

 

 

 

Shutdown REF Input Current

 

 

 

 

 

1.5

10

µA

 

 

 

 

 

 

 

 

 

MAX187/MAX189

_______________________________________________________________________________________ 3

+5V, Low-Power, 12-Bit Serial ADCs

MAX187/MAX189

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, external clock (50% duty cycle); MAX187—internal reference: VREF = 4.096V, 4.7µF capacitor at REF pin, or MAX189—external reference: VREF = 4.096V applied to REF pin, 4.7µF capacitor at REF pin; TA = TMIN to TMAX; unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

DIGITAL INPUTS (SCLK, ,

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCLK, CS Input High Voltage

VINH

 

 

2.4

 

 

V

SCLK, CS Input Low Voltage

VINL

 

 

 

 

0.8

V

SCLK, CS Input Hysteresis

VHYST

 

 

 

0.15

 

V

SCLK, CS Input Leakage

IIN

VIN = 0V or VDD

 

 

±1

µA

SCLK, CS Input Capacitance

CIN

(Note 4)

 

 

15

pF

SHDN Input High Voltage

VINSH

 

 

VDD - 0.5

 

 

V

SHDN Input Low Voltage

VINSL

 

 

 

 

0.5

V

SHDN Input Current

IINS

SHDN = VDD or 0V

 

 

±4.0

µA

SHDN Input Mid Voltage

VIM

 

 

1.5

 

VDD -1.5

V

SHDN Voltage, Floating

VFLT

SHDN = open

 

2.75

 

V

SHDN Maximum Allowed

 

SHDN = open

-100

 

100

nA

Leakage, Mid Input

 

 

 

 

 

 

 

 

 

DIGITAL OUTPUT (DOUT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Voltage Low

VOL

ISINK = 5mA

 

 

0.4

V

ISINK = 16mA

 

0.3

 

Output Voltage High

VOH

ISOURCE = 1mA

4

 

 

V

Three-State Leakage Current

IL

CS = 5V

 

 

±10

µA

Three-State Output

COUT

CS = 5V (Note 4)

 

 

15

pF

Capacitance

 

 

POWER REQUIREMENTS

 

 

 

 

 

 

 

Supply Voltage

VDD

 

 

4.75

 

5.25

V

 

 

Operating mode

MAX187

 

1.5

2.5

mA

 

 

 

 

 

 

Supply Current

IDD

MAX189

 

1.0

2.0

 

 

 

 

 

Power-down mode

 

2

10

µA

 

 

 

 

 

 

 

 

Power-Supply Rejection

PSR

VDD = +5V, ±5%; external reference, 4.096V;

 

±0.06

±0.5

mV

 

 

full-scale input (Note 6)

 

 

 

 

 

 

 

 

 

 

 

 

4 _______________________________________________________________________________________

+5V, Low-Power, 12-Bit Serial ADCs

TIMING CHARACTERISTICS

(VDD = +5.0V ±5%, TA = TMIN to TMAX, unless otherwise noted.)

PARAMETER

SYMBOL

 

 

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

 

Track/Hold Acquisition Time

tACQ

CS = high (Note 7)

1.5

 

 

µs

SCLK Fall to Output Data Valid

t

C

LOAD

= 100pF

 

MAX18_ _C/E

20

 

150

ns

 

DO

 

 

 

MAX18_ _M

20

 

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CS Fall to Output Enable

tDV

CLOAD = 100pF

 

 

100

ns

CS Rise to Output Disable

tTR

CLOAD = 100pF

 

 

100

ns

SCLK Clock Frequency

fSCLK

 

 

 

 

 

 

 

5

MHz

SCLK Pulse Width High

tCH

 

 

 

 

 

100

 

 

ns

SCLK Pulse Width Low

tCL

 

 

 

 

 

100

 

 

ns

SCLK Low to CS Fall

tCSO

 

 

 

 

 

50

 

 

ns

Setup Time

 

 

 

 

 

 

 

 

 

 

CS Pulse Width

tCS

 

 

 

 

 

500

 

 

ns

Note 1: Tested at VDD = +5V.

Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has been calibrated.

Note 3: MAX187—internal reference, offset nulled; MAX189–external +4.096V reference, offset nulled. Excludes reference errors. Note 4: Guaranteed by design. Not subject to production testing.

Note 5: External load should not change during conversion for specified ADC accuracy. Note 6: DC test, measured at 4.75V and 5.25V only.

Note 7: To guarantee acquisition time, tACQ is the maximum time the device takes to acquire the signal, and is also the minimum time needed for the signal to be acquired.

MAX187/MAX189

_______________________________________________________________________________________ 5

Maxim MAX189CEPA, MAX189CCWE, MAX189CCPA, MAX189BMJA, MAX189BCWE Datasheet

+5V, Low-Power, 12-Bit Serial ADCs

MAX187/MAX189

________________________________________________Typical Operating Characteristics

POWER-SUPPLY REJECTION vs.

TEMPERATURE

 

0.16

(mV)

0.14

0.12

REJECTION

0.10

 

SUPPLY

0.08

0.06

-

 

POWER

0.04

 

 

0.02

 

0

-60

-20

20

60

100

140

 

 

TEMPERATURE (°C)

 

 

SUPPLY CURRENT vs. TEMPERATURE

(mA)

2.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CURRENT

1.4

 

 

 

 

 

 

 

MAX187

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SUPPLY

1.0

 

 

 

 

 

 

 

MAX189

 

 

 

 

 

 

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-60

-20

20

 

60

 

100

140

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

VREF vs. TEMPERATURE

 

4.090

(V)

4.089

4.088

VOLTAGE

4.087

 

REFERENCE

4.086

4.085

 

INTERNAL

4.084

4.083

 

4.082

4.081

4.080

-60

-20

20

60

100

140

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT vs.

TEMPERATURE

 

7

A)

6

(μ

 

CURRENT

5

 

SUPPLY

4

3

SHUTDOWN

2

 

 

1

 

0

-60

-20

20

60

100

140

TEMPERATURE (°C)

6 _______________________________________________________________________________________

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