Rainbow Electronics MAX158 User Manual

19-0892; Rev 3; 12/96

CMOS High-Speed 8-Bit ADCs with

Multiplexer and Reference

_______________General Description

The MAX154/MAX158 are high-speed multi-channel
analog-to-digital converters (ADCs). The MAX154 has
four analog input channels while the MAX158 has eight
channels. Conversion time for both devices is 2.5µs.
The MAX154/MAX158 also feature a 2.5V on-chip refer­ence, forming a complete high-speed data acquisition
system.

Both converters include a built-in track/hold, eliminating
the need for an external track/hold. The analog input
range is 0V to +5V, although the ADC operates from a
single +5V supply.

____________________________Features

♦ One-Chip Data Acquisition System
♦ Four or Eight Analog Input Channels
♦ 2.5µs per Channel Conversion Time
♦ Internal 2.5V Reference
♦ Built-In Track/Hold Function

1

♦

LSB Error Specification

/

2

♦ Single +5V Supply Operation
♦ No External Clock
♦ New Space-Saving SSOP Package

Microprocessor interfaces are simplified by the ADC’s
ability to appear as a memory location or I/O port without
the need for external logic. The data outputs use latched,
three-state buffer circuitry to allow direct connection to a
microprocessor data bus or system input port.

________________________Applications

Digital Signal Processing
High-Speed Data Acquisition
Telecommunications
High-Speed Servo Control
Audio Instrumentation

______________Ordering Information

PART

MAX154ACNG

MAX154BCNG
MAX154BC/D 0°C to +70°C

MAX154ACWG
MAX154BCWG
MAX154ACAG 0°C to +70°C

TEMP. RANGE PIN-PACKAGE

0°C to +70°C

0°C to +70°C

24 Narrow
Plastic DIP

24 Narrow
Plastic DIP

Dice
0°C to +70°C 24 Wide SO
0°C to +70°C

24 Wide SO

24 SSOP

MAX154BCAG 0°C to +70°C 24 SSOP ±1

Ordering Information continued at end of data sheet.

ERROR

(LSB)

1

±

±1

1

±

1

±

±1

1

±

/

/
/

/

__________________________________________________________Pin Configurations

MAX154/MAX158

2

2
2

2

TOP VIEW

AIN4
AIN3
AIN2
AIN1

REF OUT

DB0
DB1
DB2

DB3

INT

GND

1
2
3
4

MAX154

5
6
7
8
9

RD

10
11
12

V

DD

24

N.C.

23

A0

22

A1

21

DB7

20

DB6

19

DB5

18

DB4

17

CS

16

RDY

15

+

V

14

REF

V

-

13

REF

AIN6
AIN5
AIN4
AIN3
AIN2
AIN1

REF OUT

DB0
DB1
DB2

DB3

INT

GND

1
2
3
4

MAX158

5
6
7
8

9
10
11

RD

12
13
14



AIN7

28

AIN8

27

V

26

DD

A0

25

A1

24

A2

23

DB7

22

DB6

21

DB5

20

DB4

19

CS

18

RDY

17

+

V

16

REF

V

-

15

REF

DIP/SO/SSOP

DIP/SO/SSOP

________________________________________________________________

Maxim Integrated Products

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VDDto GND.........................................0V, +10V

Voltage at Any Other Pins........................GND -0.3V, V

Output Current (REF OUT)..................................................30mA

Power Dissipation (any package) to +75°C ....................450mW

Derate above +25°C by..............................................6mW/°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.

DD

+0.3V

ELECTRICAL CHARACTERISTICS

(VDD= +5V, V

PARAMETER SYMBOL MIN TYP MAX UNITS

ACCURACY

Resolution 8 Bits

MAX154/MAX158

Total Unadjusted Error (Note 1)
No-Missing-Codes Resolution 8 Bits

Channel-to-Channel Mismatch ±1/4 LSB

REFERENCE INPUT

Reference Resistance 14kΩ

V

+ Input Voltage Range V

REF

V

- Input Voltage Range GND V

REF

REFERENCE OUTPUT (Note 2)

Output Voltage REF OUT 2.47 2.50 2.53 V
Load Regulation -6 -10 mV
Power-Supply Sensitivity ±1 ±3 mV

Output Noise e
Capacitive Load 0.01 µF

ANALOG INPUT

Analog Input Voltage Range A
Analog Input Capacitance C
Analog Input Current I
Slew Rate, Tracking SR 0.7 0.157 V/µs

LOGIC INPUTS (–R—D–, –C—S–, A0, A1, A2)

Input High Voltage V
Input Low Voltage V
Input High Current I
Input Low Current I
Input Capacitance (Note 4) C

REF+

= +5V, V

= GND, Mode 0, TA= T

REF-

N

INR
AIN

AIN

INH

INL
INH
INL

IN

to T

MIN

MAX15_A

TA= +25°C
IL= 0mA to 10mA, TA= +25°C
VDD±5%, TA= +25°C
MAX15_ _C
MAX15_ _E
MAX15_ _M

Any channel, AIN = 0V to 5V

Operating Temperature Ranges

MAX15_ _C_ _.....................................................0°C to +70°C

MAX15_ _E_ _..................................................-40°C to +85°C

MAX15_ _M_ _...............................................-55°C to +125°C

Storage Temperature Range.............................-65°C to +160°C

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

, unless otherwise noted).

MAX

CONDITIONS

±1/2

±1MAX15_B

-VDDV

REF

REF

40 70
40 70Temperature Drift (Note 3)
60 100

200 µV/rms

V

-V

REF

45 pF

2.4 V

58pF

REF

±3 µA

0.8 V

-1 µA

LSB

+ V

ppm/°C

+ V

1 µA

2 _______________________________________________________________________________________

CMOS High-Speed 8-Bit ADCs with

Multiplexer and Reference

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +5V, V

LOGIC OUTPUTS

Output High Voltage
Output Low Voltage

Output Capacitance (Note 4)

POWER-SUPPLY

Supply Voltage
Supply Current

Note 1: Total unadjusted error includes offset, full-scale, and linearity errors.
Note 2: Specified with no external load unless otherwise noted.
Note 3: Temperature drift is defined as change in output voltage from +25°C to T
Note 4: Guaranteed by design.

REF+

= +5V, V

= GND, MODE 0, TA= T

REF-

OH

V

OL

OUT

DD

DD

to T

MIN

, unless otherwise noted).

MAX

CONDITIONS

DB0-DB7, INT; I
DB0-DB7, INT; RDY
DB0-DB7, RDY; V

OUT

OUT

= -360µA

I

OUT

I

OUT

= 0V to V

= 1.6mA
= 2.6mA

5V ±5% for specified performance
CS = RD = 2.4V

VDD= ±5%

TIMING CHARACTERISTICS (Note 5)

(VDD= +5V, V

REF+

= +5V, V

= GND, MODE 0, TA= T

REF-

MIN

to T

, unless otherwise noted).

MAX

DD

MIN

or T

divided by (25 - T

MAX

MIN

0.4

0.4

) or (T

MAX

MAX154/MAX158

UNITSMIN TYP MAXSYMBOLPARAMETER

V4.0V
V

µA±3Three-State Output Current
pF58C

V4.75 5.25V

mA15I
mW25 75Power Dissipation
LSB±1/16 ±1/4PSSPower-Supply Sensitivity

- 25).

PARAMETER

CS to RD Setup Time
CS to RD Hold Time

Multiplexer Address
Setup Time

Multiplexer Address
Hold Time

CS to RDY Delay
Conversion Time (Mode 0)
Data Access Time After RD

Data Access Time
After INT, Mode 0

RD to INT Delay (Mode 1)
Data Hold Time

Delay Time
Between Conversions

RD Pulse Width (Mode 1)

SYMBOL

t

CSS

t

CSH

t

AS

t

AH

t

RDY

t

CRD

t

ACC1

t

ACC2

t

INTH

t

DH

t

P

t

RD

CONDITIONS

CL= 50pF, RL= 5kΩ

(Note 6)
(Note 6)
CL= 50pF

(Note 7)

Note 5: All input control signals are specified with t

TA= +25°C

MIN TYP MAX

0
0

0

30

30 40

1.6 2.0
85

20 50
40 75

60

500

60 600

= tF= 20ns (10% to 90% of +5V) and timed from a 1.6V voltage level.

R

MAX15_C/E

MIN MAX MIN MAX

0
0

0

35

60

2.4

110

60

100

70

500

80 500 80 400

MAX15_M

0
0

0

40

600

Note 6: Measured with load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.
Note 7: Defined as the time required for the data lines to change 0.5V when loaded with the circuits of Figure 2.

60

2.8

120

70

100

70

UNITS

ns
ns

ns

ns
ns

µs
ns

ns
ns

ns
ns
ns

_______________________________________________________________________________________ 3

CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)




REFERENCE TEMPERATURE DRIFT

2.520

MX7824/28-1

2.510

2.500

REF OUT VOLTAGE (V)

2.490

MAX154/MAX158

2.480

-50 150

050

AMBIENT TEMPERATURE (°C)

100

ACCURACY vs. V

[V

= V

2.0

1.5

1.0

LINEARITY ERROR (LSB)

0.5

0

REF

05



OUTPUT CURRENT

vs. TEMPERATURE

20

VDD = 5V

16

12

8

OUTPUT CURRENT (mA)

4

0

-100 150

-50 0 50

AMBIENT TEMPERATURE (°C)

I

SOURCE VOUT

I

SINK VOUT





REF

(+) - V

(-)]

REF

V

= 5V

DD

MX7824/28-4

3412

(V)

V

REF

REF

= 2.4V

= 0.4V

100

POWER-SUPPLY CURRENT vs. TEMPERATURE

8

7

6

5

4

– SUPPLY CURRENT (mA)

DD

I

3

2

vs. DELAY BETWEEN CONVERSIONS (t

ACCURACY 

2.0

MX7824/28-2

1.5

1.0

LINEARITY ERROR (LSB)

0.5

0

300 900

tp (ns)



(NOT INCLUDING REFERENCE LADDER)

V

= 5.25V

DD



V

= 5V

DD



V

= 4.75V

DD



-100 150

AMBIENT TEMPERATURE (°C)

50 100-50 0



MX7824/28-5

)

p

V

= 5V

DD

V

REF

700 800400 500 600

= 5V

MX7824/28-3

+5V

3k

DBN

3k

DBN

100pF

DGND

a. High-Z to V

OH

b. High-Z to V

Figure 1. Load Circuits for Data-Access Time Test

10pF

DGND

DBN

3k

DGND

OL

a. High-Z to V

OH

Figure 2. Load Circuits for Data-Hold Time Test

DBN

100pF

4 _______________________________________________________________________________________

+5V

3k

10pF

b. High-Z to V

DGND

OL