MAX158BCAI ,CMOS High-Speed 8-Bit ADCs with Multiplexer and ReferenceApplications24 NarrowMAX154BCNG 0°C to +70°C ±1Plastic DIPDigital Signal Processing1MAX154BC/D 0°C ..
MAX158BCPI ,CMOS High-Speed 8-Bit ADCs with Multiplexer and ReferenceELECTRICAL CHARACTERISTICS(V = +5V, V = +5V, V = GND, Mode 0, T = T to T , unless otherwise noted). ..
MAX158BCPI+ ,CMOS High-Speed, 8-Bit ADCs with Multiplexer and ReferenceMAX154/MAX15819-0892; Rev 3; 12/96CMOS High-Speed 8-Bit ADCs w ith Multiplexer and Reference_______ ..
MAX158BCWI ,CMOS High-Speed 8-Bit ADCs with Multiplexer and ReferenceGeneral Description ________
MAX158BCWI+ ,CMOS High-Speed, 8-Bit ADCs with Multiplexer and ReferenceGeneral Description ________
MAX158BEWI ,CMOS High-Speed 8-Bit ADCs with Multiplexer and ReferenceMAX154/MAX15819-0892; Rev 3; 12/96CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference________ ..
MAX4271ESA ,3V to 12V Current-Limiting Hot Swap Controllers with Autoretry / DualSpeed/BiLevel Fault Protection
MAX4271ESA ,3V to 12V Current-Limiting Hot Swap Controllers with Autoretry / DualSpeed/BiLevel Fault Protection
MAX4271ESA ,3V to 12V Current-Limiting Hot Swap Controllers with Autoretry / DualSpeed/BiLevel Fault Protection
MAX4271ESA+ ,3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection
MAX4271ESA+ ,3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection
MAX4271ESA+T ,3V to 12V, Current-Limiting, Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection
MAX154ACNG-MAX154ACWG-MAX154AENG-MAX154AEWG-MAX154BCAG-MAX154BCNG-MAX154BCWG-MAX154BEWG-MAX158ACAI-MAX158AEAI-MAX158AEPI-MAX158BCAI-MAX158BCPI-MAX158BCWI-MAX158BEWI
CMOS High-Speed 8-Bit ADCs with Multiplexer and Reference
_______________General DescriptionThe 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.
________________________ApplicationsDigital Signal Processing
High-Speed Data Acquisition
Telecommunications
High-Speed Servo Control
Audio Instrumentation
____________________________FeaturesOne-Chip Data Acquisition SystemFour or Eight Analog Input Channels2.5µs per Channel Conversion TimeInternal 2.5V ReferenceBuilt-In Track/Hold Function1/2LSB Error SpecificationSingle +5V Supply OperationNo External ClockNew Space-Saving SSOP Package
______________Ordering Information
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
__________________________________________________________Pin Configurations19-0892; Rev 3; 12/96
Ordering Information continued at end of data sheet.
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +5V, VREF+= +5V, VREF-= GND, Mode 0, TA= TMINto TMAX, 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, VDDto GND.........................................0V, +10V
Voltage at Any Other Pins........................GND -0.3V, VDD+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
ELECTRICAL CHARACTERISTICS (continued)(VDD= +5V, VREF+= +5V, VREF-= GND, MODE 0, TA= TMINto TMAX, unless otherwise noted).
TIMING CHARACTERISTICS (Note 5)(VDD= +5V, VREF+= +5V, VREF-= GND, MODE 0, TA= TMINto TMAX, unless otherwise noted).
Note 5:All input control signals are specified with tR= tF= 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
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 TMINor TMAXdivided by (25 - TMIN) or (TMAX- 25).
Note 4:Guaranteed by design.
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
REFERENCE TEMPERATURE DRIFT
MX7824/28-1
AMBIENT TEMPERATURE (°C)
REF OUT VOLTAGE (V)
OUTPUT CURRENT
vs. TEMPERATURE
MX7824/28-2
AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT (mA)
ACCURACY
vs. DELAY BETWEEN CONVERSIONS (tp)
MX7824/28-3
tp (ns)
LINEARITY ERROR (LSB)
ACCURACY vs. VREF
[VREF = VREF(+) - VREF(-)]
MX7824/28-4
VREF (V)
LINEARITY ERROR (LSB)12
POWER-SUPPLY CURRENT vs. TEMPERATURE
(NOT INCLUDING REFERENCE LADDER)
MX7824/28-5
AMBIENT TEMPERATURE (°C)
IDD
– SUPPLY CURRENT (mA)100-500
Figure 1. Load Circuits for Data-Access Time TestFigure 2. Load Circuits for Data-Hold Time Test
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
_____________________________________________________________Pin Descriptions
MAX154/MAX158
CMOS High-Speed 8-Bit ADCs with
Multiplexer and Reference
_______________Detailed Description
Converter OperationsThe MAX154/MAX158 use what is commonly called a
"half-flash" conversion technique (Figure 3). Two 4-bit
flash ADC converter sections are used to achieve an 8-
bit result. Using 15 comparators, the upper 4-bit MS
(most significant) flash ADC compares the unknown
input voltage to the reference ladder and provides the
upper four data bits.
An internal DAC uses the MS bits to generate an analog
signal from the first flash conversion. A residue voltage
representing the difference between the unknown input
and the DAC voltage is then compared to the reference
ladder by 15 LS (least significant) flash comparators to
obtain the lower four output bits.
Operating SequenceThe operating sequence is shown in Figure 4. A conver-
sion is initiated by a falling edge of RDand CS. The
comparator inputs track the analog input voltage for
approximately 1µs. After this first cycle, the MS flash
result is latched into the output buffers and the LS con-
version begins. INTgoes low approximately 600ns later,
indicating the end of the conversion, and that the lower
four bits are latched into the output buffers. The data
can then be accessed using the CSand RDinputs.
___________________Digital InterfaceThe MAX154/MAX158 use only Chip Select (CS) and
Read (RD) as control inputs. A READ operation, takingand RDlow, latches the multiplexer address inputs
and starts a conversion (Table 1).
There are two interface modes, which are determined
by the length of the RDinput. Mode 0, implemented by
keeping RDlow until the conversion ends, is designed
for microprocessors that can be forced into a WAIT
state. In this mode, a conversion is started with a READ
operation (taking CSand RDlow), and data is read
when the conversion ends. Mode 1, on the other hand,
does not require microprocessor WAIT states. A READ
operation simultaneously initiates a conversion and
reads the previous conversion result.
Figure 3. Functional Diagram
