MAX192 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – Low-Power, 8-Channel, Serial 10-Bit ADC

19-0247; Rev. 1; 4/97
Low-Power, 8-Channel,
Serial 10-Bit ADC
________________General Description
The MAX192 is a low-cost, 10-bit data-acquisition system
that combines an 8-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and ultra-low power consumption. The device
operates with a single +5V supply. The analog inputs are
software configurable for single-ended and differential
(unipolar/bipolar) operation.
The 4-wire serial interface connects directly to SPI™,
QSPI™, and Microwire™ devices, without using external
logic. A serial strobe output allows direct connection to
TMS320 family digital signal processors. The MAX192
uses either the internal clock or an external serial-
interface clock to perform successive approximation A/D
conversions. The serial interface can operate beyond
4MHz when the internal clock is used. The MAX192 has
an internal 4.096V reference with a drift of ±30ppm typi-
cal. A reference-buffer amplifier simplifies gain trim and
two sub-LSBs reduce quantization errors.
The MAX192 provides a hardwired SHDN pin and two
software-selectable power-down modes. Accessing the
serial interface automatically powers up the device, and
the quick turn-on time allows the MAX192 to be shut
down between conversions. By powering down
between conversions, supply current can be cut to
under 10µA at reduced sampling rates.
The MAX192 is available in 20-pin DIP and SO pack-
ages, and in a shrink-small-outline package (SSOP)
that occupies 30% less area than an 8-pin DIP. The
data format provides hardware and software compati-
bility with the MAX186/MAX188. For anti-aliasing filters,
consult the data sheets for the MAX291–MAX297.
________________________Applications
Automotive
Pen-Entry Systems
Consumer Electronics
Portable Data Logging
Robotics
Battery-Powered Instruments, Battery
Management
Medical Instruments
____________________________Features
See last page for Typical Operating Circuit.
SPI and QSPI are trademarks of Motorola Corp.
Microwire is a trademark of National Semiconductor Corp.
o 8-Channel Single-Ended or 4-Channel Differential
Inputs
o Single +5V Operation
o Low Power: 1.5mA (operating)
2µA (power-down)
o Internal Track/Hold, 133kHz Sampling Rate
o Internal 4.096V Reference
o 4-Wire Serial Interface is Compatible
with SPI, QSPI, Microwire, and TMS320
o 20-Pin DIP, SO, SSOP Packages
o Pin-Compatible 12-Bit Upgrade (MAX186/MAX188)
_______________Ordering Information
PART
MAX192ACPP
MAX192BCPP
MAX192ACWP
MAX192BCWP
MAX192ACAP
MAX192BCAP
MAX192AEPP
MAX192BEPP
MAX192AEWP
MAX192BEWP
MAX192AEAP
MAX192BEAP
MAX192AMJP
MAX192BMJP
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
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE INL (LSB)
20 Plastic DIP ±1/2
20 Plastic DIP ±1
20 Wide SO ±1/2
20 Wide SO ±1
20 SSOP
±1/2
20 SSOP
±1
20 Plastic DIP ±1/2
20 Plastic DIP ±1
20 Wide SO ±1/2
20 Wide SO ±1
20 SSOP
±1/2
20 SSOP
±1
20 CERDIP ±1/2
20 CERDIP ±1
___________________Pin Configuration
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
AGND 9
SHDN 10
MAX192
20 VDD
19 SCLK
18 CS
17 DIN
16 SSTRB
15 DOUT
14 DGND
13 AGND
12 REFADJ
11 VREF
DIP/SO/SSOP
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