Rainbow Electronics MAX188 - Manual

_______________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
____________________________Features
♦ 8-Channel Single-Ended or 4-Channel
Differential Inputs
♦ Single +5V or ±5V Operation
♦ Low Power: 1.5mA (operating mode)
2µA (power-down mode)
♦ Internal Track/Hold, 133kHz Sampling Rate
♦ Internal 4.096V Reference (MAX186)
♦ SPI-, QSPI-, Microwire-, TMS320-Compatible
4-Wire Serial Interface
♦ Software-Configurable Unipolar or Bipolar Inputs
♦ 20-Pin DIP, SO, SSOP Packages
♦ Evaluation Kit Available
______________Ordering Information
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.
TEMP. RANGE
MAX186/MAX188
Low-Power, 8-Channel,
Serial 12-Bit ADCs
________________________________________________________________ Maxim Integrated Products 1
PART
†
PIN-PACKAGE
MAX186_CPP 20 Plastic DIP
MAX186_CWP 20 SO
20 SSOP
MAX186DC/D Dice*
MAX186_EPP 20 Plastic DIP
MAX186_CAP
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
TOP VIEW
DIP/SO/SSOP
V DD
SCLK
CS
DIN
SSTRB
DOUT
DGND
AGND
REFADJ
VREF SHDN
V SS
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
MAX186
MAX188
____________________Pin Configuration
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX186_EWP 20 SO
MAX186_EAP -40°C to +85°C 20 SSOP
MAX186_MJP -55°C to +125°C 20 CERDIP**
SPI and QSPI are registered trademarks of Motorola.
Microwire is a registered trademark of National Semiconductor.
-40°C to +85°C
-40°C to +85°C
19-0123; Rev. 4; 8/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
EVALUATION KIT
AVAILABLE