Maxim MAX196ACWI, MAX196ACNI, MAX196ACAI, MAX196BCNI, MAX196BCAI Datasheet

19-0435; Rev 0; 9/95

EVALUATION KIT

AVAILABLE

Multirange, Single +5V, 12-Bit DAS

with 12-Bit Bus Interface

_______________General Description

The MAX196/MAX198 multirange, 12-bit data-acquisi­tion systems (DAS) require only a single +5V supply for
operation, yet convert analog signals at their inputs up
to ±10V (MAX196) and ±4V (MAX198). These systems
provide six analog input channels that are indepen­dently software programmable for a variety of ranges:
±10V, ±5V, 0V to +10V, and 0V to +5V for the MAX196;
±V

, ±V

REF

/2, 0V to +V

REF

, and 0V to +V

REF

REF

/2 for
the MAX198. This range switching increases the effec­tive dynamic range to 14 bits and provides the flexibility
to interface ±12V, ±15V, and 4mA to 20mA powered
sensors to a single +5V system. In addition, these con­verters are fault protected to ±16.5V; a fault condition
on any channel will not affect the conversion result of
the selected channel. Other features include a 5MHz
bandwidth track/hold, 100ksps throughput rate, soft­ware-selectable internal/external clock, internal/external
acquisition control, 12-bit parallel interface, and internal

4.096V or external reference.
Two programmable power-down modes (STBYPD,

FULLPD) provide low-current shutdown between con­versions. In STBYPD mode, the reference buffer
remains active, eliminating start-up delays.

The MAX196/MAX198 employ a standard microproces­sor (µP) interface. A three-state data I/O port is config­ured to operate with 16-bit data buses, and data­access and bus-release timing specifications are com­patible with most popular µPs. All logic inputs and out­puts are TTL/CMOS compatible.

These devices are available in 28-pin DIP, wide SO,
SSOP (55% smaller in area than wide SO), and ceramic
SB packages. For 8+4 bus interface, see the MAX197
and the MAX199 data sheets. An evaluation kit will be
available after December 1995 (MAX196EVKIT-DIP).

________________________Applications

Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications

Functional Diagram appears at end of data sheet.

____________________________Features

♦ 12-Bit Resolution, 1/2LSB Linearity
♦ Single +5V Supply Operation
♦ Software-Selectable Input Ranges:

±10V, ±5V, 0V to +10V, 0V to +5V (MAX196)
±V

, ±V

REF

(MAX198)

/2, 0V to +V

REF

, 0V to +V

REF

REF

/2

♦ Internal 4.096V or External Reference
♦ Fault-Protected Input Multiplexer
♦ 6 Analog Input Channels
♦ 6µs Conversion Time, 100ksps Sampling Rate
♦ Internal or External Acquisition Control
♦ Two Power-Down Modes
♦ Internal or External Clock

______________Ordering Information

PART

MAX196ACNI

MAX196BCNI
MAX196ACWI 0°C to +70°C
MAX196BCWI 0°C to +70°C 28 Wide SO
MAX196ACAI 0°C to +70°C 28 SSOP
MAX196BCAI 0°C to +70°C 28 SSOP

Ordering Information continued at end of data sheet.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO

__________________Pin Configuration

TOP VIEW

CLK

1

CS

2

D11

3

D10

4

D9

5
D8
D7
D6
D5
D4
D3
D2
D1
D0

DIP/SO/SSOP/Ceramic SB

MAX196

6

MAX198

7

8

9

10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

DGND
V

DD

WR
RD
INT
REF
REFADJ
CH5
CH4
CH3
CH2
CH1
CH0
AGND

MAX196/MAX198

________________________________________________________________

Maxim Integrated Products

Call toll free 1-800-722-8266 for free samples or literature.

1

Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface

ABSOLUTE MAXIMUM RATINGS

VDDto AGND............................................................-0.3V to +7V

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

REF to AGND..............................................-0.3V to (V

REFADJ to AGND.......................................-0.3V to (V

Digital Inputs to DGND...............................-0.3V to (V

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

CH0–CH5 to AGND ..........................................................±16.5V

Continuous Power Dissipation (T

Narrow Plastic DIP (derate 14.29mW/°C above +70°C)....1143mW

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.

= +70°C)

A

DD
DD
DD
DD

+ 0.3V)
+ 0.3V)
+ 0.3V)
+ 0.3V)

ELECTRICAL CHARACTERISTICS

(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, V
with 50% duty cycle; T

MAX196/MAX198

ACCURACY (Note 1)

Offset Error

Channel-to-Channel Offset
Error Matching

Gain Error
(Note 2)

Gain Temperature Coefficient
(Note 2)

DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10Vp-p (MAX196) or ±4.096Vp-p (MAX198), f

= T

to T

A

MIN

; unless otherwise noted. Typical values are at TA= +25°C.)

MAX

MAX196A/MAX198A

INLIntegral Nonlinearity

MAX196B/MAX198B

Unipolar

Bipolar
Unipolar

Bipolar
Unipolar

Bipolar
Unipolar

Bipolar

SINADSignal-to-Noise + Distortion Ratio

MAX196A/MAX198A
MAX196B/MAX198B 69
Up to the 5th harmonic

MAX196A/MAX198A
MAX196B/MAX198B
MAX196A/MAX198A
MAX196B/MAX198B

MAX196A/MAX198A
MAX196B/MAX198B
MAX196A/MAX198A
MAX196B/MAX198B

Wide SO (derate 12.50mW/°C above +70°C)..............1000mW

SSOP (derate 9.52mW/°C above +70°C) ......................762mW

Narrow Ceramic SB (derate 20.00mW/°C above +70°C)..1600mW

Operating Temperature Ranges

MAX196_C_ I/MAX198_C_ I .................................0°C to +70°C

MAX196_E_ I/MAX198_E_ I...............................-40°C to +85°C

MAX196_MYI/MAX198_MYI.............................-55°C to +125°C

Storage Temperature Range.............................-65°C to +150°C

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

= 4.096V; 4.7µF at REF pin; external clock, f

REF

CONDITIONS

±1/2

±1

±3
±5
±5

±10
±0.1
±0.5

±7

±10

±7

±10

3
5

= 100ksps)

SAMPLE

70

CLK

= 2.0MHz

UNITSMIN TYP MAXSYMBOLPARAMETER

ppm/°C

Bits12Resolution
LSB
LSB±1DNLDifferential Nonlinearity

LSB

LSB

LSB

dB
dB-85 -78THDTotal Harmonic Distortion
dB80SFDRSpurious-Free Dynamic Range

50kHz, VIN= ±5V (MAX196) or ±4V (MAX198)
(Note 3)

External CLK mode/external acquisition control
External CLK mode/external acquisition control

Aperture Jitter

2 _______________________________________________________________________________________

Internal CLK mode/internal acquisition
control (Note 4)

10

dB-86Channel-to-Channel Crosstalk
ns15Aperture Delay

ps<50
ns

Multirange, Single +5V, 12-Bit DAS

with 12-Bit Bus Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, V
with 50% duty cycle; T

PARAMETER SYMBOL MIN TYP MAX UNITS

ANALOG INPUT

Track/Hold Acquisition Time 3 µs

Small-Signal Bandwidth

Input Voltage Range
(see Table 3)

Input Current

Input Resistance
Input Capacitance 40 pF

INTERNAL REFERENCE

REF Output Voltage V
REF Output Tempco

(Contact Maxim Applications for
guaranteed temperature drift
specifications)

Output Short-Circuit Current 30 mA
Load Regulation 10 mV0mA to 0.5mA output current (Note 6)
Capacitive Bypass at REF 4.7 µF
REFADJ Output Voltage 2.465 2.500 2.535 V
REFADJ Adjustment Range ±1.5 %With recommended circuit (Figure 1)
Buffer Voltage Gain 1.6384 V/V

= T

to T

A

MIN

; unless otherwise noted. Typical values are at TA= +25°C.)

MAX

CONDITIONS

f

= 2.0MHz

∆V

∆I

TC V

CLK

-3dB
rolloff

Unipolar

V

IN

Bipolar

Unipolar

I

IN

Bipolar

Unipolar

IN

IN

Bipolar
(Note 5)

TA= +25°C

REF

MAX196_C/MAX198_C

REF

±10V or ±V
±5V or ±V
0V to 10V or 0V to V
0V to 5V or 0V to V

MAX196

MAX198

MAX196

MAX198

MAX196
MAX198
MAX196

MAX198

= 4.096V; 4.7µF at REF pin; external clock, f

REF

range

REF

/2 range

REF

0V to 10V range
0V to 5V range

±10V range
±5V range
±V

REF

±V

REF

REF

/2 range

REF

range

/2 range

range

1.25
010
05
0V
0V

-10 10

-5 5

-V

REF

-V

/2 V

REF

-1200 720

-600 360

-1200 10

-600 10

4.076 4.096 4.116 V

5

2.5

2.5

REF

V

REF

720
360

0.1 10

21
16

15
30MAX196_E/MAX198_E
40MAX196_M/MAX198_M

CLK

REF

REF

= 2.0MHz

/2

/2

ppm/°C

MAX196/MAX198

MHz

V

µA

kΩ

_______________________________________________________________________________________ 3

Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, V
with 50% duty cycle; T

REFERENCE INPUT (buffer disabled, reference input applied to REF pin)

Input Current

Input Resistance
REFADJ Threshold for

Buffer Disable

POWER REQUIREMENTS

MAX196/MAX198

Supply Voltage

Supply Current

Power-Supply Rejection Ratio
(Note 8)

TIMING

Internal Clock Frequency
External Clock Frequency Range MHz

Acquisition Time

Conversion Time

Throughput Rate
Bandgap Reference

Start-Up Time
Reference Buffer Settling
DIGITAL INPUTS (D7–D0, CLK, RD, WR, CS) (Note 11)

Input High Voltage V
Input Low Voltage V
Input Leakage Current I
Input Capacitance

= T

to T

A

MIN

; unless otherwise noted. Typical values are at TA= +25°C.)

MAX

Normal, or STANDBY

=

power-down mode
FULL power-down mode

= 100pF MHz1.25 1.56 2.00f

CLK

CLK

DD

DD

I

DD

PSRR

CLK
CLK

t

ACQI

t

ACQE

t

CONV

INH

INL
IN

C

IN

V

REF

4.18V
Normal, or STANDBY power-down mode kΩ10

FULL power-down mode 5 MΩ

Normal mode, bipolar ranges
Normal mode, unipolar ranges
STANDBY power-down mode
FULL power-down mode (Note 7)
External reference = 4.096V
Internal reference ±1/

C

CLK

Internal acquisition
External acquisition (Note 9)

After FULLPD or STBYPD
External CLK
Internal CLK, C
External CLK
Internal CLK, C

Power-up (Note 10) µs200

To 0.1mV REF bypass
capacitor fully discharged

= 4.096V; 4.7µF at REF pin; external clock, f

REF

CONDITIONS

610

700 850

60 120

±0.1 ±1/

2

0.1 2.0f

External CLK

Internal CLK

= 100pF 6.0 7.7 10.0

= 100pF 62

C

= 4.7µF

REF

C

= 33µF

REF

3.0

3.0 5.0

3.0
5

6.0

8

60

2.4 V

= 2.0MHz

CLK

UNITSMIN TYP MAXSYMBOLPARAMETER

400

1

18

2

100

0.8 V

±10 µAVIN= 0V or V

15 pF(Note 5)

V2.4 4.18Input Voltage Range

µA

VVDD- 50mV

V4.75 5.25V

mA

µA

LSB

µs

µs

ksps

ms

4 _______________________________________________________________________________________

Multirange, Single +5V, 12-Bit DAS

with 12-Bit Bus Interface

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, V
with 50% duty cycle; T

PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS

DIGITAL OUTPUTS (D11–D0, INT)

Output Low Voltage V
Output High Voltage V
Three-State Output Capacitance C

= T

to T

A

MIN

; unless otherwise noted. Typical values are at TA= +25°C.)

MAX

OL
OH

OUT

SINK
SOURCE

= 4.096V; 4.7µF at REF pin; external clock, f

REF

= 1.6mA

= 1mA

VDD- 1 VVDD= 4.75V, I

CLK

0.4 VVDD= 4.75V, I

15 pF(Note 5)

= 2.0MHz

TIMING CHARACTERISTICS

(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, V
with 50% duty cycle; T

PARAMETER SYMBOL MIN TYP MAX UNITS

CS Pulse Width t
WR Pulse Width t
CS to WR Setup Time
CS to WR Hold Time t
CS to RD Setup Time
CS to RD Hold Time t
CLK to WR Setup Time
CLK to WR Hold Time t
Data Valid to WR Setup
Data Valid to WR Hold t
RD Low to Output Data Valid
RD High to Output Disable
RD Low to INT High Delay

Note 1: Accuracy specifications tested at VDD= 5.0V. Performance at power-supply tolerance limits guaranteed by Power-Supply
Note 2: External reference: V

Note 3: Ground “on” channel; sine wave applied to all “off” channels.
Note 4: Maximum full-power input frequency for 1LSB error with 10ns jitter = 3kHz.
Note 5: Guaranteed by design. Not tested.
Note 6: Use static loads only.
Note 7: Tested using internal reference.
Note 8: PSRR measured at full-scale.
Note 9: External acquisition timing: starts at data valid at ACQMOD = low control byte; ends at rising edge of WR

Note 10: Not subject to production testing. Provided for design guidance only.
Note 11: All input control signals specified with t
Note 12: t
Note 13: t

Rejection test. Tested for the ±10V (MAX196) and ±4.096V (MAX198) input ranges.

= high control byte.

is measured with the load circuits of Figure 2 and defined as the time required for an output to cross 0.8V or 2.4V.

DO

is defined as the time required for the data lines to change by 0.5V.

TR

= T

to T

A

MIN

; unless otherwise noted.)

MAX

CONDITIONS

CS

WR

t

CSWS
CSWH

t

CSRS
CSRH

t

CWS
CWH

t

DS

DH

t

DO

t

TR

t

INT1

= 4.096V, offset error nulled, ideal last code transition = FS - 3/2LSB.

REF

= tF= 5ns from a voltage level of 0.8V to 2.4V.

R

= 4.096V; 4.7µF at REF pin; external clock, f

REF

80 ns
80 ns

0 ns
0 ns
0 ns
0 ns

60 ns

0 ns

= 2.0MHz

CLK

100 ns

50 ns

120 nsFigure 2, CL= 100pF (Note 12)

70 ns(Note 13)

120 ns

with ACQMOD

MAX196/MAX198

_______________________________________________________________________________________ 5