MAX128BCAI+ Maxim Integrated Products, MAX128BCAI+ Datasheet

IC DAS 12BIT 2-WIRE 28-SSOP

MAX128BCAI+

Manufacturer Part Number
MAX128BCAI+
Description
IC DAS 12BIT 2-WIRE 28-SSOP
Manufacturer
Maxim Integrated Products
Type
Data Acquisition System (DAS)r
Datasheet

Specifications of MAX128BCAI+

Resolution (bits)
12 b
Sampling Rate (per Second)
8k
Data Interface
Serial
Voltage Supply Source
Single Supply
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX127/MAX128 are multirange, 12-bit data
acquisition systems (DAS) that require only a single
+5V supply for operation, yet accept signals at their
analog inputs that may span above the power-supply
rail and below ground. These systems provide eight
analog input channels that are independently software
programmable for a variety of ranges: ±10V, ±5V, 0 to
+10V, 0 to +5V for the MAX127; and ±V
to +V
switching increases the effective dynamic range to 14
bits and provides the flexibility to interface 4–20mA,
±12V, and ±15V-powered sensors directly to a single
+5V system. In addition, these converters are fault pro-
tected to ±16.5V; a fault condition on any channel will
not affect the conversion result of the selected channel.
Other features include a 5MHz bandwidth track/hold,
an 8ksps throughput rate, and the option of an internal
4.096V or external reference.
The MAX127/MAX128 feature a 2-wire, I
serial interface that allows communication among multi-
ple devices using SDA and SCL lines.
A hardware shutdown input (SHDN) and two software-
programmable power-down modes (standby and full
power-down) are provided for low-current shutdown
between conversions. In standby mode, the reference-
buffer remains active, eliminating start-up delays.
The MAX127/MAX128 are available in 24-pin DIP or
space-saving 28-pin SSOP packages.
Ordering Information continued at end of data sheet.
19-4773; Rev 0; 7/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX127ACNG
MAX127ACNG
PART
REF
Industrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
, 0 to +V
TEMP. RANGE
0°C to +70°C
0°C to +70°C
________________________________________________________________ Maxim Integrated Products
REF
Ordering Information
/2 for the MAX128. This range
General Description
24 Narrow Plastic DIP
24 Narrow Plastic DIP
PIN-PACKAGE
Applications
Multirange, +5V, 12-Bit DAS with
REF
2
C-compatible
, ±V
REF
(LSB)
±1/2
±1
/2, 0
INL
Pin Configurations appear at end of data sheet.
2-Wire Serial Interface
4.7 F
12-Bit Resolution, 1/2 LSB Linearity
+5V Single-Supply Operation
I
Four Software-Selectable Input Ranges
8 Analog Input Channels
8ksps Sampling Rate
±16.5V Overvoltage-Tolerant Input Multiplexer
Internal 4.096V or External Reference
Two Power-Down Modes
24-Pin Narrow DIP or 28-Pin SSOP Packages
2
C-Compatible, 2-Wire Serial Interface
MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
MAX128: 0 to +V
ANALOG
INPUTS
0.01 F
±V
Typical Operating Circuit
REF
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
REF
REFADJ
/2
0.1 F
REF
DGND
MAX127
MAX128
, 0 to +V
AGND
+5V
SHDN
V
SDA
SCL
DD
A0
A1
A2
REF
/2, ±V
Features
REF
SCL SDA
C
,
1k
1

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MAX128BCAI+ Summary of contents

Page 1

... MAX127ACNG 0°C to +70°C 24 Narrow Plastic DIP Ordering Information continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface ...

Page 2

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0.3V to +6V DD AGND to DGND.....................................................-0.3V to +0.3V CH0–CH7 to AGND ......................................................... ±16.5V REF to AGND..............................................-0. REFADJ to AGND.......................................-0. A0, A1, A2 ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +5V ±5%; unipolar/bipolar range; external reference mode unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL ANALOG INPUT Track/Hold Acquisition Time Small-Signal Bandwidth ...

Page 4

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface ELECTRICAL CHARACTERISTICS (continued +5V ±5%; unipolar/bipolar range; external reference mode unless otherwise noted. Typical values are MIN MAX PARAMETER ...

Page 5

ELECTRICAL CHARACTERISTICS (continued +5V ±5%; unipolar/bipolar range; external reference mode unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL DIGITAL INPUTS (SDA, SCL) Input High Threshold ...

Page 6

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface TIMING CHARACTERISTICS (continued +4.75V to +5.25V; unipolar/bipolar range; external reference mode unless otherwise noted. Typical values are at T PARAMETERS SYMBOL 2-WIRE STANDARD MODE SCL Clock Frequency f ...

Page 7

V DD REF SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) FULL POWER-DOWN SUPPLY CURRENT vs. TEMPERATURE 150 130 EXTERNAL REFERENCE ...

Page 8

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface PIN NAME DIP SSOP 11, 22 22, 24 N.C. 24, 25 DGND 5 5 SCL ...

Page 9

SHDN CH0 CH1 ANALOG CH2 INPUT CH3 MUX CH4 AND SIGNAL CH5 CONDITIONING CH6 CH7 REF 2.5V REFERENCE REFADJ Figure 1. Block Diagram Detailed Description Converter Operation The MAX127/MAX128 multirange, fault-tolerant ADCs use successive approximation and internal track/hold (T/H) circuitry ...

Page 10

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface Table 1. Control-Byte Format BIT 7 BIT 6 BIT 5 (MSB) START SEL2 SEL1 BIT NAME The logic "1" received after acknowledge of a write bit (R defines the 7 ...

Page 11

The MAX127/MAX128 have a 7-bit-long slave address. The first four bits (MSBs) of the slave address have been factory programmed and are always 0101. The logic state of the address input pins (A2–A0) determine the three LSBs of the device ...

Page 12

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface Start a Conversion (Write Cycle) A conversion cycle begins with the master issuing a START condition followed by seven address bits (Figure 3) and a write bit (R/W = 0). Once the ...

Page 13

SLAVE ADDRESS BYTE 0 1 MSB START CONDITION Figure 10. Complete 2-Wire Serial Read Transmission The MAX127/MAX128 ignore acknowledge and NOT- acknowledge conditions issued by the master during the read cycle. The device waits for the master ...

Page 14

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface REF MAX127 MAX128 A = 1.638 V REFADJ 10k 2.5V Figure 11a. Internal Reference REF MAX127 MAX128 A = 1.638 V REFADJ 10k 2.5V Figure 11b. External Reference, Reference at REF REF ...

Page 15

Transfer Function Output data coding for the MAX127/MAX128 is binary in unipolar mode with 1LSB = (FS/4096) and two’s complement binary in bipolar mode with 1LSB = [( 4096]. Code transitions occur halfway between successive-integer LSB ...

Page 16

... 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 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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