MAX197BCAI Maxim Integrated, MAX197BCAI Datasheet

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MAX197BCAI

Manufacturer Part Number
MAX197BCAI
Description
Analog to Digital Converters - ADC Integrated Circuits (ICs)
Manufacturer
Maxim Integrated
Datasheet
1.MAX197ACWI-T.pdf (16 pages)

Specifications of MAX197BCAI

Number Of Channels
8
Architecture
SAR
Conversion Rate
100 KSPs
Resolution
12 bit
Input Type
Single-Ended
Snr
Yes
Interface Type
Parallel
Operating Supply Voltage
4.75 V to 5.25 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
SSOP-28
Maximum Power Dissipation
762 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Factory Pack Quantity
46
Voltage Reference
Internal 4.096 V or External

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The 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 does not
affect 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 SHDN pin 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), refer to the MAX199 data sheet. For 12-bit
bus interface, refer to the MAX196 and MAX198 data
sheets.
________________________Applications
19-0381; Rev 2; 9/01
Functional Diagram appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
_______________General Description
Single +5V, 12-Bit DAS with 8+4 Bus Interface
Industrial-Control Systems
Robotics
Data-Acquisition Systems
Automatic Testing Systems
Medical Instruments
Telecommunications
________________________________________________________________ Maxim Integrated Products
Multi-Range (±10V, ±5V, +10V, +5V),
o 12-Bit Resolution, 1/2LSB Linearity
o Single +5V Operation
o Software-Selectable Input Ranges:
o Fault-Protected Input Multiplexer (±16.5V)
o 8 Analog Input Channels
o 6µs Conversion Time, 100ksps Sampling Rate
o Internal or External Acquisition Control
o Internal 4.096V or External Reference
o Two Power-Down Modes
o Internal or External Clock
____________________________Features
Ordering Information continued at end of data sheet.
*Dice are specified at T
______________Ordering Information
MAX197ACNI
MAX197BCNI
MAX197ACWI
MAX197BCWI
MAX197ACAI
MAX197BCAI
MAX197BC/D
__________________Pin Configuration
±10V, ±5V, 0V to 10V, 0V to 5V
TOP VIEW
PART
D2/D10
D3/D11
D1/D9
D0/D8
SHDN
HBEN
CLK
WR
RD
CS
D7
D6
D5
D4
DIP/SO/SSOP/Ceramic SB
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
10
11
12
13
14
1
2
3
4
5
6
7
8
9
A
= +25°C, DC parameters only.
MAX197
PIN-PACKAGE
28 Narrow Plastic DIP
28 Narrow Plastic DIP
28 Wide SO
28 Wide SO
28 SSOP
28 SSOP
Dice*
28
26
25
24
23
22
19
18
17
16
15
27
21
20
DGND
V
REF
CH7
CH6
CH5
CH3
CH2
CH1
CH0
REFADJ
INT
CH4
AGND
DD
1

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MAX197BCAI Summary of contents

Page 1

... MAX197BCNI 0°C to +70°C MAX197ACWI 0°C to +70°C MAX197BCWI 0°C to +70°C MAX197ACAI 0°C to +70°C MAX197BCAI 0°C to +70°C MAX197BC/D 0°C to +70°C Ordering Information continued at end of data sheet. *Dice are specified +25°C, DC parameters only. A __________________Pin Configuration ...

Page 2

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0.3V to +7V DD AGND to DGND.....................................................-0.3V to +0.3V REF to AGND..............................................-0. REFADJ to AGND.......................................-0. Digital Inputs to ...

Page 3

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ELECTRICAL CHARACTERISTICS (continued ±5%; unipolar/bipolar range; external reference mode with 50% duty cycle MIN MAX PARAMETER ...

Page 4

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ELECTRICAL CHARACTERISTICS (continued ±5%; unipolar/bipolar range; external reference mode with 50% duty cycle unless otherwise noted.) ...

Page 5

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface TIMING CHARACTERISTICS ( ±5%; unipolar/bipolar range; external reference mode with 50% duty cycle MIN MAX PARAMETER SYMBOL ...

Page 6

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A INTEGRAL NONLINEARITY vs. DIGITAL CODE 0.250 0.200 0.150 0.100 0.050 0.000 -0.050 -0.100 -0.150 0 1000 2000 ...

Page 7

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ______________________________________________________________Pin Description PIN NAME Clock Input. In external clock mode, drive CLK with a TTL/CMOS compatible clock. In internal clock mode, 1 CLK place a capacitor from ...

Page 8

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface _______________Detailed Description Converter Operation The 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 ...

Page 9

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface The input channels are overvoltage protected to ±16.5V. This protection is active even if the device is in power-down mode. Even with V = 0V, the input ...

Page 10

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface Table 6. Data-Bus Output PIN HBEN = LOW HBEN = HIGH D0 B0 (LSB B10 D3 B3 B11 (MSB ...

Page 11

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface CSWS CONTROL D7–D0 BYTE ACQMOD = "1" INT RD HBEN DOUT Figure 6. Conversion Timing Using External Acquisition ...

Page 12

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface External Clock Mode Select external clock mode by writing the control byte with and Figure 8 shows CLK and WR timing ...

Page 13

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface __________Applications Information At power-up, the internal power-supply circuitry sets INT high and puts the device in normal operation/external clock mode. This state is selected to keep the ...

Page 14

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface Power-Down Mode To save power, you can put the converter into low- current shutdown mode between conversions. Two programmable power-down modes are available, in addition to a ...

Page 15

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface Transfer Function Output data coding for the MAX197 is binary in unipo- lar mode with 1LSB = (FS / 4096) and two’s-comple- ment binary in bipolar mode ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2001 Maxim Integrated Products ...

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