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General Description
The MAX191 is a monolithic, CMOS, 12-bit analog-to-
digital converter (ADC) featuring differential inputs,
track/hold (T/H), internal voltage reference, internal or
external clock, and parallel or serial µP interface. The
MAX191 has a 7.5µs conversion time, a 2µs acquisition
time, and a guaranteed 100ksps sample rate.
The MAX191 operates from a single +5V supply or from
dual ±5V supplies, allowing ground-referenced bipolar
input signals. The device features a logic power-down
input, which reduces the 3mA V
DD
supply current to
50µA max, including the internal-reference current.
Decoupling capacitors are the only external compo-
nents needed for the power supply and reference. This
ADC operates with either an external reference, or an
internal reference that features an adjustment input for
trimming system gain errors.
The MAX191 provides three interface modes: two 8-bit
parallel modes, and a serial interface mode that is com-
patible with SPI
TM
, QSPI
TM
, and MICROWIRE
TM
serial-
interface standards.
________________________Applications
Battery-Powered Data Logging
PC Pen Digitizers
High-Accuracy Process Control
Electromechanical Systems
Data-Acquisition Boards for PCs
Automatic Testing Systems
Telecommunications
Digital Signal Processing (DSP)
____________________________Features
♦ 12-Bit Resolution, 1/2LSB Linearity
♦ +5V or ±5V Operation
♦ Built-In Track/Hold
♦ Internal Reference with Adjustment Capability
♦ Low Power: 3mA Operating Mode
20µA Power-Down Mode
♦ 100ksps Tested Sampling Rate
♦ Serial and 8-Bit Parallel µP Interface
♦ 24-Pin Narrow DIP and Wide SO Packages
MAX191
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
________________________________________________________________
Maxim Integrated Products
1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
V
DD
CLK/SCLK
PAR
HBEN
AIN-
AIN+
V
SS
PD
TOP VIEW
CS
RD
D7/DOUT
D6/SCLK
OUT
BIP
AGND
REFADJ
VREF
16
15
14
13
9
10
11
12
D5/SSTRB
D4
D3/D11
D2/D10
DGND
D1/D9
D0/D8
BUSY
DIP/SO
MAX191
Pin Configuration
2.46V
REF
IN REF OUT
12-BIT
SAR ADC
OSC
CONTROL
LOGIC
3-STATE
OUTPUT
8-BIT
BUS
AND
SERIAL
I/O
18
17
16
15
14
13
11
10
20
19
9
21
D7/DOUT
D6/SCLK
OUT
D5/SSTRB
D4
D3/D11
D2/D10
D1/D9
D0/D8
CS
RD
BUSY
HBEN
REFADJ
VREF
AIN +
AIN -
5
6
3
4
24 23
V
DD
CLK/SCLK
712
PD
1
22 8
AGND DGND
2
PAR
BIP
MAX191
12
V
SS
Functional Diagram
19-4506; Rev 4; 2/97
PART TEMP. RANGE PIN-PACKAGE
MAX191ACNG 0°C to +70°C
24 Narrow Plastic DIP
24 Wide SO
±1/2
±1
±1/2
ERROR
(LSB)
24 Narrow Plastic DIP
MAX191BCNG
MAX191ACWG
0°C to +70°C
0°C to +70°C
MAX191BCWG 0°C to +70°C 24 Wide SO ±1
MAX191BC/D Dice* ±10°C to +70°C
MAX191AENG -40°C to +85°C 24 Narrow Plastic DIP ±1/2
MAX191BENG -40°C to +85°C 24 Narrow Plastic DIP ±1
MAX191AEWG -40°C to +85°C 24 Wide SO ±1/2
MAX191AMRG 24 Narrow CERDIP** ±1/2
MAX191BMRG 24 Narrow CERDIP** ±1
-55°C to +125°C
-55°C to +125°C
MAX191BEWG -40°C to +85°C 24 Wide SO ±1
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
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.
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
* Dice are specified at T
A
= +25°C, DC parameters only.
** Contact factory for availability and processing to MIL-STD-883.
Ordering Information
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