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 refer-
ence, 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.
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.
____________________________Features
o
One-Chip Data Acquisition System
o
Four or Eight Analog Input Channels
o
2.5µs per Channel Conversion Time
o
Internal 2.5V Reference
o
Built-In Track/Hold Function
o
1/2
LSB Error Specification
o
Single +5V Supply Operation
o
No External Clock
o
New Space-Saving SSOP Package
MAX154/MAX158
______________Ordering Information
PART
MAX154ACNG
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
24 Narrow
Plastic DIP
24 Narrow
Plastic DIP
Dice
24 Wide SO
24 Wide SO
24 SSOP
24 SSOP
ERROR
(LSB)
±
1/2
±1
±
1/2
±
1/2
±1
±
1/2
±1
________________________Applications
Digital Signal Processing
High-Speed Data Acquisition
Telecommunications
High-Speed Servo Control
Audio Instrumentation
MAX154BCNG
MAX154BC/D
MAX154ACWG
MAX154BCWG
MAX154ACAG
MAX154BCAG
Ordering Information continued at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
AIN6 1
AIN4 1
AIN3 2
AIN2 3
AIN1 4
REF OUT 5
DB0 6
DB1 7
DB2 8
DB3 9
RD 10
INT 11
GND 12
24 V
DD
23 N.C.
22 A0
21 A1
AIN5 2
AIN4 3
AIN3 4
AIN2 5
AIN1 6
REF OUT 7
DB0 8
DB1 9
DB2 10
DB3 11
RD 12
INT 13
GND 14
28 AIN7
27 AIN8
26 V
DD
25 A0
MAX158
24 A1
23 A2
22 DB7
21 DB6
20 DB5
19 DB4
18 CS
17 RDY
16 V
REF
+
15 V
REF
-
MAX154
20 DB7
19 DB6
18 DB5
17 DB4
16 CS
15 RDY
14 V
REF
+
13 V
REF
-
DIP/SO/SSOP
DIP/SO/SSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
MAX154/MAX158
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD
to GND.........................................0V, +10V
Voltage at Any Other Pins........................GND -0.3V, V
DD
+0.3V
Output Current (REF OUT)..................................................30mA
Power Dissipation (any package) to +75°C ....................450mW
Derate above +25°C by ..............................................6mW/°C
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
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
(V
DD
= +5V, V
REF+
= +5V, V
REF-
= GND, Mode 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted).
PARAMETER
ACCURACY
Resolution
Total Unadjusted Error (Note 1)
No-Missing-Codes Resolution
Channel-to-Channel Mismatch
REFERENCE INPUT
Reference Resistance
V
REF
+ Input Voltage Range
V
REF
- Input Voltage Range
REFERENCE OUTPUT
(Note 2)
Output Voltage
Load Regulation
Power-Supply Sensitivity
Temperature Drift (Note 3)
Output Noise
Capacitive Load
ANALOG INPUT
Analog Input Voltage Range
Analog Input Capacitance
Analog Input Current
A
INR
C
AIN
I
AIN
Any channel, AIN = 0V to 5V
0.7
2.4
0.8
1
-1
5
8
V
REF
-
45
±3
0.157
V
REF
+
V
pF
µA
V/µs
V
V
µA
µA
pF
e
N
REF OUT
T
A
= +25°C
I
L
= 0mA to 10mA, T
A
= +25°C
V
DD
±5%, T
A
= +25°C
MAX15_ _C
MAX15_ _E
MAX15_ _M
2.47
2.50
-6
±1
40
40
60
200
0.01
2.53
-10
±3
70
70
100
µV/rms
µF
ppm/°C
V
mV
mV
1
V
REF
-
GND
4
V
DD
V
REF
+
kΩ
V
V
MAX15_A
MAX15_B
8
±1/4
8
±1/2
±1
Bits
LSB
Bits
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Slew Rate, Tracking
SR
– – ––
— —
LOGIC INPUTS ( RD , CS , A0, A1, A2)
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Input Capacitance (Note 4)
V
INH
V
INL
I
INH
I
INL
C
IN
2
_______________________________________________________________________________________
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V
REF+
= +5V, V
REF-
= GND, MODE 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted).
PARAMETER
LOGIC OUTPUTS
Output High Voltage
Output Low Voltage
Three-State Output Current
Output Capacitance (Note 4)
POWER-SUPPLY
Supply Voltage
Supply Current
Power Dissipation
Power-Supply Sensitivity
Note 1:
Note 2:
Note 3:
Note 4:
PSS
V
DD
= ±5%
V
DD
I
DD
5V ±5% for specified performance
CS = RD = 2.4V
25
±1/16
4.75
5.25
15
75
±1/4
V
mA
mW
LSB
C
OUT
V
OH
V
OL
DB0-DB7, INT; I
OUT
= -360µA
DB0-DB7, INT; RDY
I
OUT
= 1.6mA
I
OUT
= 2.6mA
5
4.0
0.4
0.4
±3
8
V
V
µA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX154/MAX158
DB0-DB7, RDY; V
OUT
= 0V to V
DD
Total unadjusted error includes offset, full-scale, and linearity errors.
Specified with no external load unless otherwise noted.
Temperature drift is defined as change in output voltage from +25°C to T
MIN
or T
MAX
divided by (25 - T
MIN
) or (T
MAX
- 25).
Guaranteed by design.
TIMING CHARACTERISTICS
(Note 5)
(V
DD
= +5V, V
REF+
= +5V, V
REF-
= GND, MODE 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted).
T
A
= +25°C
MIN
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)
t
CSS
t
CSH
t
AS
t
AH
t
RDY
t
CRD
t
ACC1
t
ACC2
t
INTH
t
DH
t
P
t
RD
(Note 6)
(Note 6)
C
L
= 50pF
(Note 7)
500
60
600
20
40
C
L
= 50pF, R
L
= 5kΩ
0
0
0
30
30
1.6
40
2.0
85
50
75
60
500
80
500
TYP
MAX
MAX15_C/E
MIN
0
0
0
35
60
2.4
110
60
100
70
600
80
400
MAX
MAX15_M
MIN
0
0
0
40
60
2.8
120
70
100
70
MAX
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
ns
PARAMETER
SYMBOL
CONDITIONS
UNITS
Note 5:
All input control signals are specified with t
R
= t
F
= 20ns (10% to 90% of +5V) and timed from a 1.6V voltage level.
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.
_______________________________________________________________________________________
3
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
MAX154/MAX158
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
REFERENCE TEMPERATURE DRIFT
MX7824/28-1
OUTPUT CURRENT
vs. TEMPERATURE
MX7824/28-2
ACCURACY
vs. DELAY BETWEEN CONVERSIONS (t
p
)
V
DD
= 5V
V
REF
= 5V
1.5
MX7824/28-3
2.520
20
V
DD
= 5V
OUTPUT CURRENT (mA)
16
I
SOURCE
V
OUT
= 2.4V
12
2.0
REF OUT VOLTAGE (V)
2.510
LINEARITY ERROR (LSB)
150
2.500
1.0
8
I
SINK
V
OUT
= 0.4V
4
2.490
0.5
2.480
-50
0
50
100
150
AMBIENT TEMPERATURE (°C)
0
-100
-50
0
50
100
AMBIENT TEMPERATURE (°C)
0
300
400
500
600
t
p
(ns)
700
800
900
ACCURACY vs. V
REF
[V
REF
= V
REF
(+) - V
REF
(-)]
MX7824/28-4
POWER-SUPPLY CURRENT vs. TEMPERATURE
(NOT INCLUDING REFERENCE LADDER)
MX7824/28-5
2.0
V
DD
= 5V
LINEARITY ERROR (LSB)
1.5
8
I
DD
– SUPPLY CURRENT (mA)
7
6
5
4
3
2
V
DD
= 4.75V
V
DD
= 5.25V
1.0
V
DD
= 5V
0.5
0
0
1
2
3
4
5
V
REF
(V)
-100
-50
0
50
100
150
AMBIENT TEMPERATURE (°C)
+5V
3k
DBN
3k
DGND
100pF
DBN
10pF
DGND
DBN
3k
DGND
100pF
DBN
+5V
3k
10pF
DGND
a. High-Z to V
OH
b. High-Z to V
OL
a. High-Z to V
OH
b. High-Z to V
OL
Figure 1. Load Circuits for Data-Access Time Test
4
Figure 2. Load Circuits for Data-Hold Time Test
_______________________________________________________________________________________
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
_____________________________________________________________Pin Descriptions
PIN
MAX154
1
2
3
4
5
6
7
8
9
10
NAME
AIN4
AIN3
AIN2
AIN1
REF OUT
DBO
DB1
DB2
DB3
RD
FUNCTION
Analog Input Channel 4
Analog Input Channel 3
Analog Input Channel 2
Analog Input Channel 1
Reference Output (2.5V) for MAX154
Three-State Data Output, bit 0 (LSB)
Three-State Data Output, bit 1
Three-State Data Output, bit 2
Three-State Data Output, bit 3
Read Input. RD controls conversions and
data access. See
Digital Interface
section.
Interrupt Output. INT going low indi-
cates the completion of a conversion.
See
Digital Interface
section.
Ground
Lower Limit of Reference Span. Sets
the zero-code voltage.
Range: GND to V
REF
+.
Upper Limit of Reference Span. Sets
the full-scale input voltage.
Range: V
REF
- to V
DD
.
Ready Output. Open-drain output with
no active pull-up device. Goes low
when CS goes low and high imped-
ance at the end of a conversion.
Chip-Select Input. CS must be low for
the device to be selected.
Three-State Data Output, bit 4
Three-State Data Output, bit 5
Three-State Data Output, bit 6
Three-State Data Output, bit 7 (MSB)
Channel Address 1 Input
Channel Address 0 Input
No Connect
Power-Supply Voltage, +5V
PIN
MAX158
1
2
3
4
5
6
7
8
9
10
11
12
NAME
AIN6
AIN5
AIN4
AIN3
AIN2
AIN1
REF OUT
DB0
DB1
DB2
DB3
RD
FUNCTION
Analog Input Channel 6
Analog Input Channel 5
Analog Input Channel 4
Analog Input Channel 3
Analog Input Channel 2
Analog Input Channel 1
Reference Output (2.5V) for MAX158
Three-State Data Output, bit 0 (LSB)
Three-State Data Output, bit 1
Three-State Data Output, bit 2
Three-State Data Output, bit 3
Read Input. RD controls conversions
and data access.
See
Digital Interface
section.
Interrupt Output. INT going low indi-
cates the completion of a conversion.
See
Digital Interface
section.
Ground
Lower Limit of Reference Span. Sets
the zero-code voltage.
Range: GND to V
REF
+.
Upper Limit of Reference Span. Sets
the full-scale input voltage.
Range: V
REF
- to V
DD
.
Ready Output. Open-drain output with
no active pull-up device. Goes low
when CS goes low and high imped-
ance at the end of a conversion.
–
Chip-Select input. CS must be low for
the device to be selected.
Three-State Data Output, bit 4
Three-State Data Output, bit 5
Three-State Data Output, bit 6
Three-State Data Output, bit 7 (MSB)
Channel Address 2 Input
Channel Address 1 Input
Channel Address 0 Input
Power-Supply Voltage, +5V
Analog Input Channel 8
Analog Input Channel 7
5
MAX154/MAX158
11
12
13
INT
GND
V
REF
-
13
14
15
INT
GND
V
REF
-
14
V
REF
+
16
V
REF
+
15
RDY
17
RDY
16
17
18
19
20
21
22
23
24
CS
DB4
DB5
DB6
DB7
A1
A0
NC
V
DD
18
19
20
21
22
23
24
25
26
27
28
CS
DB4
DB5
DB6
DB7
A2
A1
A0
V
DD
AIN8
AIN7
_______________________________________________________________________________________
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