_______________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.
________________________Applications
Digital Signal Processing
High-Speed Data Acquisition
Telecommunications
High-Speed Servo Control
Audio Instrumentation
____________________________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
______________Ordering Information
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
________________________________________________________________
Maxim Integrated Products
1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
V
DD
N.C.
A0
A1
AIN1
AIN2
AIN3
AIN4
TOP VIEW
DB7
DB6
DB5
DB4
DB2
DB1
DB0
REF OUT
16
15
14
13
9
10
11
12
CS
RDY
V
REF
+
V
REF
-
GND
INT
RD
DB3
DIP/SO/SSOP
MAX154
28
27
26
25
24
23
22
21
1
2
3
4
5
6
7
8
AIN7
AIN8
V
DD
A0
AIN3
AIN4
AIN5
AIN6
A1
A2
DB7
DB6
DB0
REF OUT
AIN1
AIN2
20
19
18
17
9
10
11
12
DB5
DB4
CS
RDY
RD
DB3
DB2
DB1
DIP/SO/SSOP
MAX158
16
15
13
14
V
REF
+
V
REF
-
GND
INT
__________________________________________________________Pin Configurations
19-0892; Rev 3; 12/96
PART
MAX154
ACNG
MAX154BCNG
MAX154BC/D
0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
24 Narrow
Plastic DIP
24 Narrow
Plastic DIP
Dice
MAX154ACWG
MAX154BCWG
MAX154ACAG
0°C to +70°C
0°C to +70°C
0°C to +70°C
24 Wide SO
24 Wide SO
24 SSOP
Ordering Information continued at end of data sheet.
ERROR
(LSB)
±
1/2
±1
±
1/2
±
1/2
±1
±
1/2
MAX154BCAG
0°C to +70°C
24 SSOP
±1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V, V
REF+
= +5V, V
REF-
= GND, Mode 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted).
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.
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
Input Capacitance (Note 4)
C
IN
5
8
pF
Input Low Voltage
V
INL
0.8
V
Input High Current
I
INH
1
µA
Input Low Current
I
INL
-1
µA
Analog Input Current
I
AIN
±3
µA
Slew Rate, Tracking
SR
0.7
0.157
V/µs
Input High Voltage
V
INH
2.4
V
Any channel, AIN = 0V to 5V
Output Noise
e
N
200
µV/rms
Capacitive Load
0.01
µF
Analog Input Voltage Range
A
INR
V
REF
-
V
REF
+
V
Analog Input Capacitance
C
AIN
45
pF
±1
MAX15_B
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Channel-to-Channel Mismatch
±1/4
LSB
No-Missing-Codes Resolution
8
Bits
Total Unadjusted Error (Note 1)
±1/2
LSB
Reference Resistance
1
4
k
V
REF
+ Input Voltage Range
V
REF
-
V
DD
V
V
REF
- Input Voltage Range
GND
V
REF
+
V
Resolution
8
Bits
Output Voltage
REF OUT
2.47
2.50
2.53
V
Load Regulation
-6
-10
mV
Power-Supply Sensitivity
±1
±3
mV
40
70
40
70
Temperature Drift (Note 3)
60
100
ppm/°C
CONDITIONS
T
A
= +25°C
MAX15_A
ACCURACY
REFERENCE INPUT
REFERENCE OUTPUT (Note 2)
ANALOG INPUT
LOGIC INPUTS (
R
--
D
,
C
--
S
, A0, A1, A2)
I
L
= 0mA to 10mA, T
A
= +25°C
V
DD
±5%, T
A
= +25°C
MAX15_ _C
MAX15_ _E
MAX15_ _M
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V, V
REF+
= +5V, V
REF-
= GND, MODE 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted).
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).
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.
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
_______________________________________________________________________________________
3
(Note 6)
(Note 6)
C
L
= 50pF, R
L
= 5k
(Note 7)
C
L
= 50pF
CONDITIONS
ns
60
t
DH
Data Hold Time
ns
40
75
t
INTH
RD to INT Delay (Mode 1)
ns
0
t
CSH
ns
0
t
CSS
CS to RD Setup Time
CS to RD Hold Time
ns
20
50
t
ACC2
Data Access Time
After INT, Mode 0
ns
85
t
ACC1
Data Access Time After RD
µs
1.6
2.0
t
CRD
Conversion Time (Mode 0)
ns
30
40
t
RDY
CS to RDY Delay
ns
0
t
AS
Multiplexer Address
Setup Time
ns
30
t
AH
Multiplexer Address
Hold Time
UNITS
MIN
TYP
MAX
SYMBOL
ns
500
t
P
Delay Time
Between Conversions
500
70
100
0
0
60
110
2.4
60
0
35
MAX15_C/E
600
70
100
0
0
70
120
2.8
60
0
40
MAX15_M
MIN
MAX
MIN
MAX
ns
60
600
t
RD
RD Pulse Width (Mode 1)
80
500
80
400
DB0-DB7, INT; I
OUT
= -360µA
CS = RD = 2.4V
5V ±5% for specified performance
DB0-DB7, INT; RDY
DB0-DB7, RDY; V
OUT
= 0V to V
DD
V
DD
= ±5%
CONDITIONS
LSB
±1/16
±1/4
PSS
Power-Supply Sensitivity
V
4.0
V
OH
Output High Voltage
mW
25
75
Power Dissipation
mA
15
I
DD
Supply Current
V
4.75
5.25
V
DD
Supply Voltage
0.4
V
0.4
V
OL
Output Low Voltage
µA
±3
Three-State Output Current
pF
5
8
C
OUT
Output Capacitance (Note 4)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
I
OUT
= 1.6mA
I
OUT
= 2.6mA
LOGIC OUTPUTS
POWER-SUPPLY
PARAMETER
T
A
= +25°C
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
MIN
or T
MAX
divided by (25 - T
MIN
) or (T
MAX
- 25).
Note 4:
Guaranteed by design.
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
2.520
2.480
-50
150
REFERENCE TEMPERATURE DRIFT
2.490
2.510
MX7824/28-1
AMBIENT TEMPERATURE (°C)
REF OUT VOLTAGE (V)
2.500
100
0
50
20
0
-100
150
OUTPUT CURRENT
vs. TEMPERATURE
4
12
16
MX7824/28-2
AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT (mA)
8
100
-50
0
50
V
DD
= 5V
I
SOURCE
V
OUT
= 2.4V
I
SINK
V
OUT
= 0.4V
2.0
0
300
900
ACCURACY
vs. DELAY BETWEEN CONVERSIONS (t
p
)
0.5
1.0
1.5
MX7824/28-3
t
p
(ns)
LINEARITY ERROR (LSB)
700
800
400
500
600
V
DD
= 5V
V
REF
= 5V
2.0
0
0
5
ACCURACY vs. V
REF
[V
REF
= V
REF
(+) - V
REF
(-)]
0.5
1.0
1.5
MX7824/28-4
V
REF
(V)
LINEARITY ERROR (LSB)
3
4
1
2
V
DD
= 5V
3k
3k
100pF
DGND
DBN
a. High-Z to V
OH
b. High-Z to V
OL
DBN
+5V
DGND
10pF
3k
3k
100pF
DGND
DBN
a. High-Z to V
OH
b. High-Z to V
OL
DBN
+5V
DGND
10pF
8
2
-100
150
POWER-SUPPLY CURRENT vs. TEMPERATURE
(NOT INCLUDING REFERENCE LADDER)
3
4
5
6
7
MX7824/28-5
AMBIENT TEMPERATURE (°C)
I
DD
SUPPLY CURRENT (mA)
50
100
-50
0
V
DD
= 5.25V
V
DD
= 5V
V
DD
= 4.75V
Figure 1. Load Circuits for Data-Access Time Test
Figure 2. Load Circuits for Data-Hold Time Test
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
_______________________________________________________________________________________
5
Reference Output (2.5V) for MAX154
REF OUT
5
Three-State Data Output, bit 0 (LSB)
DBO
6
Three-State Data Output, bit 1
DB1
7
Analog Input Channel 1
AIN1
4
Analog Input Channel 2
AIN2
3
Analog Input Channel 3
AIN3
2
Analog Input Channel 4
AIN4
1
_____________________________________________________________Pin Descriptions
Three-State Data Output, bit 2
DB2
8
Three-State Data Output, bit 3
DB3
9
Read Input. RD controls conversions and
data access. See
Digital Interface section.
RD
10
Three-State Data Output, bit 7 (MSB)
DB7
20
Ground
GND
12
Lower Limit of Reference Span. Sets
the zero-code voltage.
Range: GND to V
REF
+.
V
REF
-
13
Interrupt Output. INT going low indi-
cates the completion of a conversion.
See
Digital Interface section.
INT
11
Chip-Select Input. CS must be low for
the device to be selected.
CS
16
Three-State Data Output, bit 4
DB4
17
Three-State Data Output, bit 5
DB5
18
Three-State Data Output, bit 6
DB6
19
Interrupt Output. INT going low indi-
cates the completion of a conversion.
See
Digital Interface section.
INT
13
Ground
GND
14
Analog Input Channel 2
AIN2
5
Analog Input Channel 1
AIN1
6
Reference Output (2.5V) for MAX158
REF OUT
7
Analog Input Channel 3
AIN3
4
Analog Input Channel 4
AIN4
3
Analog Input Channel 5
AIN5
2
Analog Input Channel 6
AIN6
1
Three-State Data Output, bit 0 (LSB)
DB0
8
Three-State Data Output, bit 1
DB1
9
Three-State Data Output, bit 2
DB2
10
Three-State Data Output, bit 3
DB3
11
Lower Limit of Reference Span. Sets
the zero-code voltage.
Range: GND to V
REF
+.
V
REF
-
15
Read Input. RD controls conversions
and data access.
See
Digital Interface section.
RD
12
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.
RDY
17
Power-Supply Voltage, +5V
V
DD
26
Channel Address 2 Input
A2
23
Channel Address 1 Input
A1
24
Channel Address 0 Input
A0
25
Upper Limit of Reference Span. Sets
the full-scale input voltage.
Range: V
REF
- to V
DD
.
V
REF
+
14
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.
RDY
15
Power-Supply Voltage, +5V
V
DD
24
Channel Address 1 Input
A1
21
Channel Address 0 Input
A0
22
No Connect
NC
23
Three-State Data Output, bit 7 (MSB)
DB7
22
Chip-Select input.
CS must be low for
the device to be selected.
CS
18
Three-State Data Output, bit 4
DB4
19
Three-State Data Output, bit 5
DB5
20
Three-State Data Output, bit 6
DB6
21
Analog Input Channel 8
AIN8
27
Analog Input Channel 7
AIN7
28
Upper Limit of Reference Span. Sets
the full-scale input voltage.
Range: V
REF
- to V
DD
.
V
REF
+
16
PIN
MAX154
FUNCTION
NAME
PIN
MAX158
FUNCTION
NAME
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