_______________General Description
The MAX196/MAX198 multirange, 12-bit data-acquisi-
tion 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 indepen-
dently software programmable for a variety of ranges:
10V, 5V, 0V to +10V, and 0V to +5V for the MAX196;
V
REF
, V
REF
/2, 0V to +V
REF
, and 0V to +V
REF
/2 for
the MAX198. This range switching increases the effec-
tive 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 con-
verters 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, soft-
ware-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 con-
versions. In STBYPD mode, the reference buffer
remains active, eliminating start-up delays.
The MAX196/MAX198 employ a standard microproces-
sor (P) interface. A three-state data I/O port is config-
ured to operate with 16-bit data buses, and data-
access and bus-release timing specifications are com-
patible with most popular Ps. All logic inputs and out-
puts 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
____________________________Features
o
12-Bit Resolution, 1/2LSB Linearity
o
Single +5V Supply Operation
o
Software-Selectable Input Ranges:
10V, 5V, 0V to +10V, 0V to +5V (MAX196)
V
REF
, V
REF
/2, 0V to +V
REF
, 0V to +V
REF
/2
(MAX198)
o
Internal 4.096V or External Reference
o
Fault-Protected Input Multiplexer
o
6 Analog Input Channels
o
6s Conversion Time, 100ksps Sampling Rate
o
Internal or External Acquisition Control
o
Two Power-Down Modes
o
Internal or External Clock
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
________________________________________________________________
Maxim Integrated Products
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DGND
V
DD
WR
RD
INT
REF
AGND
REFADJ
CH5
CH4
CH3
CH2
CH1
CH0
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
CS
CLK
DIP/SO/SSOP/Ceramic SB
TOP VIEW
MAX196
MAX198
__________________Pin Configuration
Call toll free 1-800-722-8266 for free samples or literature.
19-0435; Rev 0; 9/95
PART
MAX196
ACNI
MAX196BCNI
MAX196ACWI
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
EVALUATION KIT
AVAILABLE
______________Ordering Information
MAX196BCWI
0C to +70C
28 Wide SO
Functional Diagram appears at end of data sheet.
Ordering Information continued at end of data sheet.
MAX196ACAI
0C to +70C
28 SSOP
MAX196BCAI
0C to +70C
28 SSOP
Aperture Jitter
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 5V 5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7F at REF pin; external clock, f
CLK
= 2.0MHz
with 50% duty cycle; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25C.)
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.
V
DD
to AGND............................................................-0.3V to +7V
AGND to DGND.....................................................-0.3V to +0.3V
REF to AGND..............................................-0.3V to (V
DD
+ 0.3V)
REFADJ to AGND.......................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to DGND...............................-0.3V to (V
DD
+ 0.3V)
Digital Outputs to DGND ............................-0.3V to (V
DD
+ 0.3V)
CH0CH5 to AGND ..........................................................16.5V
Continuous Power Dissipation (T
A
= +70C)
Narrow Plastic DIP (derate 14.29mW/C above +70C)....1143mW
Wide SO (derate 12.50mW/C above +70C)..............1000mW
SSOP (derate 9.52mW/C above +70C) ......................762mW
Narrow Ceramic SB (derate 20.00mW/C above +70C)..1600mW
Operating Temperature Ranges
MAX196_C_ I/MAX198_C_ I .................................0C to +70C
MAX196_E_ I/MAX198_E_ I ...............................-40C to +85C
MAX196_MYI/MAX198_MYI.............................-55C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
MAX196A/MAX198A
Internal CLK mode/internal acquisition
control (Note 4)
External CLK mode/external acquisition control
External CLK mode/external acquisition control
50kHz, V
IN
= 5V (MAX196) or 4V (MAX198)
(Note 3)
Up to the 5th harmonic
Bipolar
MAX196B/MAX198B
Unipolar
MAX196A/MAX198A
CONDITIONS
10
ps
<50
ns
15
Aperture Delay
dB
-86
Channel-to-Channel Crosstalk
dB
80
SFDR
Spurious-Free Dynamic Range
dB
-85
-78
THD
Total Harmonic Distortion
dB
70
LSB
1/2
INL
Integral Nonlinearity
Bits
12
Resolution
0.5
LSB
0.1
Channel-to-Channel Offset
Error Matching
10
5
1
LSB
1
DNL
Differential Nonlinearity
LSB
3
Offset Error
5
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Bipolar
Unipolar
5
ppm/C
3
Gain Temperature Coefficient
(Note 2)
10
7
LSB
7
Gain Error
(Note 2)
10
MAX196B/MAX198B
69
SINAD
Signal-to-Noise + Distortion Ratio
ns
Bipolar
Unipolar
Bipolar
MAX196B/MAX198B
MAX196B/MAX198B
Unipolar
MAX196B/MAX198B
MAX196B/MAX198B
MAX196A/MAX198A
MAX196A/MAX198A
MAX196A/MAX198A
MAX196A/MAX198A
ACCURACY
(Note 1)
DYNAMIC SPECIFICATIONS
(10kHz sine-wave input, 10Vp-p (MAX196) or 4.096Vp-p (MAX198), f
SAMPLE
= 100ksps)
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V 5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7F at REF pin; external clock, f
CLK
= 2.0MHz
with 50% duty cycle; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25C.)
MAX198
MAX196
MAX198
MAX196
-600
360
I
IN
-1200
720
A
V
REF
/2 range
V
REF
range
5V range
-1200
10
10V range
-600
10
Bipolar
Input Voltage Range
(see Table 3)
V
IN
-10
10
-5
5
MAX196
-V
REF
V
REF
-V
REF
/2
V
REF
/2
MAX198
Bipolar
MAX196
MAX198
0V to 5V or 0V to V
REF
/2 range
0V to 10V or 0V to V
REF
range
5V or V
REF
/2 range
10V or V
REF
range
Buffer Voltage Gain
1.6384
V/V
REFADJ Adjustment Range
1.5
%
With recommended circuit (Figure 1)
Capacitive Bypass at REF
4.7
F
REFADJ Output Voltage
2.465
2.500
2.535
V
Load Regulation
10
mV
0mA to 0.5mA output current (Note 6)
0
V
REF
0
V
REF
/2
Unipolar
Input Resistance
V
IN
I
IN
21
k
16
360
Unipolar
Input Current
720
Bipolar
0V to 5V range
0.1
10
0V to 10V range
Unipolar
2.5
Small-Signal Bandwidth
5
MHz
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
2.5
-3dB
rolloff
1.25
0
10
V
0
5
Track/Hold Acquisition Time
3
s
Input Capacitance
40
pF
REF Output Voltage
V
REF
4.076
4.096
4.116
V
REF Output Tempco
(Contact Maxim Applications for
guaranteed temperature drift
specifications)
15
ppm/C
Output Short-Circuit Current
30
mA
CONDITIONS
(Note 5)
T
A
= +25C
MAX196_C/MAX198_C
f
CLK
= 2.0MHz
TC V
REF
40
MAX196_M/MAX198_M
30
MAX196_E/MAX198_E
ANALOG INPUT
INTERNAL REFERENCE
Input Capacitance
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V 5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7F at REF pin; external clock, f
CLK
= 2.0MHz
with 50% duty cycle; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25C.)
V
2.4
4.18
Input Voltage Range
A
400
Input Current
V
REF
=
4.18V
1
V
V
DD
- 50mV
REFADJ Threshold for
Buffer Disable
Normal, or STANDBY power-down mode
k
10
Input Resistance
FULL power-down mode
5
M
Normal, or STANDBY
power-down mode
FULL power-down mode
Internal acquisition
3.0
5.0
External reference = 4.096V
After FULLPD or STBYPD
External acquisition (Note 9)
CONDITIONS
FULL power-down mode (Note 7)
5
s
3.0
t
ACQI
Acquisition Time
LSB
0.1
1
/
2
PSRR
Power-Supply Rejection Ratio
(Note 8)
3.0
t
ACQE
External CLK
s
V
4.75
5.25
V
DD
Supply Voltage
6.0
t
CONV
Conversion Time
Internal CLK, C
CLK
= 100pF
6.0
7.7
10.0
To 0.1mV REF bypass
capacitor fully discharged
ms
8
Reference Buffer Settling
60
120
60
Normal mode, bipolar ranges
700
850
Normal mode, unipolar ranges
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
STANDBY power-down mode
mA
18
I
DD
Supply Current
6
10
A
Internal reference
1
/
2
C
CLK
= 100pF
MHz
1.25
1.56
2.00
f
CLK
Internal Clock Frequency
0.1
2.0
f
CLK
External Clock Frequency Range
MHz
External CLK
Internal CLK
Power-up (Note 10)
s
200
Bandgap Reference
Start-Up Time
External CLK
ksps
100
Throughput Rate
Internal CLK, C
CLK
= 100pF
62
C
REF
= 4.7F
C
REF
= 33F
C
IN
15
pF
(Note 5)
Input Leakage Current
I
IN
10
A
V
IN
= 0V or V
DD
Input Low Voltage
V
INL
0.8
V
Input High Voltage
V
INH
2.4
V
POWER REQUIREMENTS
TIMING
REFERENCE INPUT
(buffer disabled, reference input applied to REF pin)
DIGITAL INPUTS
(D7D0, CLK, RD, WR, CS) (Note 11)
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
_______________________________________________________________________________________
5
Note 1:
Accuracy specifications tested at V
DD
= 5.0V. Performance at power-supply tolerance limits guaranteed by Power-Supply
Rejection test. Tested for the 10V (MAX196) and 4.096V (MAX198) input ranges.
Note 2:
External reference: V
REF
= 4.096V, offset error nulled, ideal last code transition = FS - 3/2LSB.
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 with ACQMOD
= high control byte.
Note 10:
Not subject to production testing. Provided for design guidance only.
Note 11:
All input control signals specified with t
R
= t
F
= 5ns from a voltage level of 0.8V to 2.4V.
Note 12:
t
DO
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.
Note 13:
t
TR
is defined as the time required for the data lines to change by 0.5V.
TIMING CHARACTERISTICS
(V
DD
= 5V 5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7F at REF pin; external clock, f
CLK
= 2.0MHz
with 50% duty cycle; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V 5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7F at REF pin; external clock, f
CLK
= 2.0MHz
with 50% duty cycle; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at T
A
= +25C.)
Three-State Output Capacitance
C
OUT
15
pF
(Note 5)
Output High Voltage
V
OH
V
DD
- 1
V
V
DD
= 4.75V, I
SOURCE
= 1mA
Output Low Voltage
V
OL
0.4
V
V
DD
= 4.75V, I
SINK
= 1.6mA
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
DIGITAL OUTPUTS
(D11D0, INT)
RD Low to Output Data Valid
t
DO
120
ns
Figure 2, C
L
= 100pF (Note 12)
Data Valid to WR Setup
Data Valid to WR Hold
t
DH
0
ns
t
DS
60
ns
CLK to WR Setup Time
CLK to WR Hold Time
t
CWH
50
ns
t
CWS
100
ns
CS to RD Setup Time
CS to RD Hold Time
t
CSRH
0
ns
t
CSRS
0
ns
CS to WR Setup Time
CS to WR Hold Time
t
CSWH
0
ns
t
CSWS
0
ns
WR Pulse Width
t
WR
80
ns
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CS Pulse Width
t
CS
80
ns
RD Low to INT High Delay
t
INT1
120
ns
RD High to Output Disable
t
TR
CONDITIONS
70
ns
(Note 13)
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