MAX186 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – Low-Power, 8-Channel, Serial 12-Bit ADCs

19-0123; Rev. 4; 8/96
EVAALVUAAILTAIOBNLEKIT
Low-Power, 8-Channel,
Serial 12-Bit ADCs
_______________General Description
The MAX186/MAX188 are 12-bit data-acquisition sys-
tems that combine an 8-channel multiplexer, high-band-
width track/hold, and serial interface together with high
conversion speed and ultra-low power consumption.
The devices operate with a single +5V supply or dual
±5V supplies. The analog inputs are software config-
urable for unipolar/bipolar and single-ended/differential
operation.
The 4-wire serial interface directly connects to SPI™,
QSPI™ and Microwire™ devices without external logic. A
serial strobe output allows direct connection to TMS320
family digital signal processors. The MAX186/MAX188
use either the internal clock or an external serial-interface
clock to perform successive-approximation A/D conver-
sions. The serial interface can operate beyond 4MHz
when the internal clock is used.
The MAX186 has an internal 4.096V reference while the
MAX188 requires an external reference. Both parts
have a reference-buffer amplifier that simplifies gain
trim .
The MAX186/MAX188 provide a hard-wired SHDN pin
and two software-selectable power-down modes.
Accessing the serial interface automatically powers up
the devices, and the quick turn-on time allows the
MAX186/MAX188 to be shut down between every
conversion. Using this technique of powering down
between conversions, supply current can be cut to
under 10µA at reduced sampling rates.
The MAX186/MAX188 are available in 20-pin DIP and
SO packages, and in a shrink small-outline package
(SSOP), that occupies 30% less area than an 8-pin DIP.
For applications that call for a parallel interface, see the
MAX180/MAX181 data sheet. For anti-aliasing filters,
consult the MAX274/MAX275 data sheet.
________________________Applications
Portable Data Logging
Data-Acquisition
High-Accuracy Process Control
Automatic Testing
Robotics
Battery-Powered Instruments
Medical Instruments
SPI and QSPI are registered trademarks of Motorola.
Microwire is a registered trademark of National Semiconductor.
____________________________Features
o 8-Channel Single-Ended or 4-Channel
Differential Inputs
o Single +5V or ±5V Operation
o Low Power: 1.5mA (operating mode)
2µA (power-down mode)
o Internal Track/Hold, 133kHz Sampling Rate
o Internal 4.096V Reference (MAX186)
o SPI-, QSPI-, Microwire-, TMS320-Compatible
4-Wire Serial Interface
o Software-Configurable Unipolar or Bipolar Inputs
o 20-Pin DIP, SO, SSOP Packages
o Evaluation Kit Available
______________Ordering Information
PART^†
TEMP. RANGE PIN-PACKAGE
MAX186_CPP
0°C to +70°C
20 Plastic DIP
MAX186_CWP
0°C to +70°C
20 SO
MAX186_CAP
0°C to +70°C
20 SSOP
MAX186DC/D
0°C to +70°C
Dice*
MAX186_EPP
-40°C to +85°C
20 Plastic DIP
MAX186_EWP -40°C to +85°C
20 SO
MAX186_EAP
-40°C to +85°C
20 SSOP
MAX186_MJP
-55°C to +125°C 20 CERDIP**
Ordering Information continued on last page.
† NOTE: Parts are offered in grades A, B, C and D (grades defined
in Electrical Characteristics). When ordering, please specify grade.
Contact factory for availability of A-grade in SSOP package.
* Dice are specified at +25°C, DC parameters only.
* * Contact factory for availability and processing to MIL-STD-883.
____________________Pin Configuration
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
V_SS 9
SHDN 10
MAX186
MAX188
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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