MAX197BCAI ,Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus InterfaceApplicationsHBEN 5 24 INTIndustrial-Control Systems MAX197SHDN 23 CH76RoboticsD77 22 CH6Data-Acquis ..
MAX197BCAI ,Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus InterfaceGeneral Description ________
MAX197BCAI+ ,Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus InterfaceELECTRICAL CHARACTERISTICS(V = 5V ±5%; unipolar/bipolar range; external reference mode, V = 4.096V; ..
MAX197BCAI+ ,Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus InterfaceMAX19719-0381; Rev 2; 9/01Multi-Range (±10V, ±5V, +10V, +5V),Single +5V, 12-Bit DAS with 8+4 Bus In ..
MAX197BCNI ,Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interfacefeatures include a 5MHz bandwidth track/hold, a100ksps throughput rate, software-selectable interna ..
MAX197BCNI+ ,Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interfacefeatures include a 5MHz bandwidth track/hold, a100ksps throughput rate, software-selectable interna ..
MAX5003CEE ,High-Voltage PWM Power-Supply Controllerfeatures and building blocks need- Internal High-Voltage Startup Circuited for a cost-effective fl ..
MAX5003CEE+ ,High-Voltage PWM Power-Supply ControllerMAX500319-1555; Rev 2; 4/02High-Voltage PWM Power-Supply Controller
MAX5003CSE+ ,High-Voltage PWM Power-Supply Controllerfeatures and building blocks need-♦ Internal High-Voltage Startup Circuited for a cost-effective fl ..
MAX5003EEE ,High-Voltage PWM Power-Supply ControllerELECTRICAL CHARACTERISTICS(V+ = V = V = +12V, V = 2V, V = 0, R = R = 200kΩ , T = T to T , unless ot ..
MAX5003EEE ,High-Voltage PWM Power-Supply ControllerFeaturesThe MAX5003 high-voltage switching power-supply Wide Input Range: 11V to 110Vcontroller ha ..
MAX5003EEE+ ,High-Voltage PWM Power-Supply Controllerfeatures and building blocks need-♦ Internal High-Voltage Startup Circuited for a cost-effective fl ..
MAX197ACAI-MAX197ACNI-MAX197ACWI-MAX197AEAI-MAX197AENI-MAX197AEWI-MAX197BCAI-MAX197BCNI-MAX197BCWI-MAX197BEAI-MAX197BENI-MAX197BEWI
Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface
_______________General DescriptionThe MAX197 multi-range, 12-bit data-acquisition sys-
tem (DAS) requires only a single +5V supply for opera-
tion, yet accepts signals at its analog inputs that may
span both above the power-supply rail and below
ground. This system provides 8 analog input channels
that are independently software programmable for a
variety of ranges: ±10V, ±5V, 0V to +10V, or 0V to +5V.
This increases effective dynamic range to 14 bits, and
provides the user flexibility to interface 4mA-to-20mA,
±12V, and ±15V powered sensors to a single +5V sys-
tem. In addition, the converter is overvoltage tolerant to
±16.5V; a fault condition on any channel will notaffect
the conversion result of the selected channel. Other
features include a 5MHz bandwidth track/hold, a
100ksps throughput rate, software-selectable internal or
external clock and acquisition, 8+4 parallel interface,
and an internal 4.096V or an external reference.
A hardware SHDNpin and two programmable power-
down modes (STBYPD, FULLPD) are provided for low-
current shutdown between conversions. In STBYPD
mode, the reference buffer remains active, eliminating
start-up delays.
The MAX197 employs a standard microprocessor (µP)
interface. A three-state data I/O port is configured to
operate with 8-bit data buses, and data-access and
bus-release timing specifications are compatible with
most popular µPs. All logic inputs and outputs are
TTL/CMOS compatible.
The MAX197 is available in 28-pin DIP, wide SO, SSOP,
and ceramic SB packages.
For a different combination of ranges (±4V, ±2V, 0V to
4V, 0V to 2V), see the MAX199 data sheet. For 12-bit bus
interface, see the MAX196 and MAX198 data sheets.
________________________ApplicationsIndustrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
____________________________Features12-Bit Resolution, 1/2LSB LinearitySingle +5V OperationSoftware-Selectable Input Ranges:
±10V, ±5V, 0V to 10V, 0V to 5VFault-Protected Input Multiplexer (±16.5V)8 Analog Input Channels6µs Conversion Time, 100ksps Sampling RateInternal or External Acquisition ControlInternal 4.096V or External ReferenceTwo Power-Down ModesInternal or External Clock
MAX197, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
________________________________________________________________Maxim Integrated Products1
__________________Pin ConfigurationFunctional Diagram appears at end of data sheet.
Ordering Information continued at end of data sheet.*Dice are specified at TA= +25°C, DC parameters only.
& the latest literature: http://,
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, VREF= 4.096V; 4.7µF at REF pin; external clock, fCLK= 2.0MHz
with 50% duty cycle; 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.
VDDto AGND............................................................-0.3V to +7V
AGND to DGND.....................................................-0.3V to +0.3V
REF to AGND..............................................-0.3V to (VDD+ 0.3V)
REFADJ to AGND.......................................-0.3V to (VDD+ 0.3V)
Digital Inputs to DGND...............................-0.3V to (VDD+ 0.3V)
Digital Outputs to DGND............................-0.3V to (VDD+ 0.3V)
CH0–CH7 to AGND..........................................................±16.5V
Continuous Power Dissipation (TA= +70°C)
Narrow Plastic DIP (derate 14.29mW/°C above +70°C)....1143mW
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
MAX197_C_ _.......................................................0°C to +70°C
MAX197_E_ _.....................................................-40°C to +85°C
MAX197_M_ _..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, VREF= 4.096V; 4.7µF at REF pin; external clock, fCLK= 2.0MHz
with 50% duty cycle; TA= TMINto TMAX, unless otherwise noted.)
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, VREF= 4.096V; 4.7µF at REF pin; external clock, fCLK= 2.0MHz
with 50% duty cycle; TA= TMINto TMAX, unless otherwise noted.)
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
_______________________________________________________________________________________5
Note 1:Accuracy specifications tested at VDD= 5.0V. Performance at power-supply tolerance limits guaranteed by Power-Supply
Rejection test. Tested for the ±10V input range.
Note 2:External reference: VREF= 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 WRwith ACQMOD
= high control byte.
Note 10:Not subject to production testing. Provided for design guidance only.
Note 11:All input control signals specified with tR= tF= 5ns from a voltage level of 0.8V to 2.4V.
Note 12:tDOand tDO1are 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:tTRis defined as the time required for the data lines to change by 0.5V.
TIMING CHARACTERISTICS(VDD= 5V ±5%; unipolar/bipolar range; external reference mode, VREF= 4.096V; 4.7µF at REF pin; external clock, fCLK= 2.0MHz
with 50% duty cycle; TA= TMINto TMAX, unless otherwise noted.)
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
EFFECTIVE NUMBER OF BITS
vs. INPUT FREQUENCY
MAX197-3
INPUT FREQUENCY (kHz)
EFFECTIVE NUMBER OF BITS
-55-3545105125TEMPERATURE (°C)
REF
(V)
REFERENCE OUTPUT VOLTAGE (VREF)
vs. TEMPERATURE
MAX197-4
-70-5050110130TEMPERATURE (°C)
CHANNEL-TO-CHANNEL
GAIN-ERROR MATCHING (LSB)
CHANNEL-TO-CHANNEL
GAIN-ERROR MATCHING vs. TEMPERATURE
MAX197-7
MAX197-5
-70-5050110130TEMPERATURE (°C)
PSRR (LSB)
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
MAX197-6
-70-5050110130TEMPERATURE (°C)
CHANNEL-TO-CHANNEL
OFFSET-ERROR MATCHING (LSB)
CHANNEL-TO-CHANNEL
OFFSET-ERROR MATCHING vs. TEMPERATURE
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
_______________________________________________________________________________________7
______________________________________________________________Pin DescriptionFigure 1. Reference-Adjust Circuit
Figure 2. Load Circuits for Enable Time
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface_______________________________________________________________________________________
_______________Detailed Description
Converter OperationThe MAX197, a multi-range, fault-tolerant ADC, uses
successive approximation and internal input track/hold
(T/H) circuitry to convert an analog signal to a 12-bit
digital output. The parallel-output format provides easy
interface to microprocessors (µPs). Figure 3 shows the
MAX197 in its simplest operational configuration.
Analog-Input Track/HoldIn the internal acquisition control mode (control bit D5
set to 0), the T/H enters its tracking mode on WR’s ris-
ing edge, and enters its hold mode when the internally
timed (6 clock cycles) acquisition interval ends. A low
impedance input source, which settles in less than
1.5µs, is required to maintain conversion accuracy at
the maximum conversion rate.
In the external acquisition control mode (D5 = 1), the
T/H enters its tracking mode on the first WRrising edge
and enters its hold mode when it detects the second WR
rising edge with D5 = 0. See the External Acquisition
section.
Input BandwidthThe ADC’s input tracking circuitry has a 5MHz small-
signal bandwidth. When using the internal acquisition
mode with an external clock frequency of 2MHz, a
100ksps throughput rate can be achieved. It is possible
to digitize high-speed transient events and measure
periodic signals with bandwidths exceeding the ADC’s
sampling rate by using undersampling techniques. To
avoid high-frequency signals being aliased into the fre-
quency band of interest, anti-alias filtering is recom-
mended (MAX274/MAX275 continuous-time filters).
Input Range and ProtectionFigure 4 shows the equivalent input circuit. With VREF=
4.096V, the MAX197 can be programmed for input
ranges of ±10V, ±5V, 0V to 10V, or 0V to 5V by setting the
appropriate control bits (D3, D4) in the control byte (see
Tables 2 and 3). The full-scale input voltage depends on
the voltage at REF (Table 1). When an external reference
is applied at REFADJ, the voltage at REF is given by VREF
= 1.6384 x VREFADJ(2.4V < VREF< 4.18V).
Figure 3. Operational Diagram
