Rainbow Electronics MAX1143 - Manual

General Description
The MAX1142/MAX1143 are 200ksps, 14-bit ADCs.
These serially interfaced ADCs connect directly to
SPI™, QSPI™, and MICROWIRE™ devices without
external logic. They combine an input scaling network,
internal track/hold, a clock, +4.096V reference, and
three general-purpose digital output pins (for external
multiplexer or PGA control) in a 20-pin SSOP package.
The excellent dynamic performance (SINAD
≥
81dB),
high-speed (200ksps), and low power (7.5mA) of these
ADCs, make them ideal for applications such as indus-
trial process control, instrumentation, and medical
applications. The MAX1142 accepts input signals of 0
to +12V (unipolar) or ±12V (bipolar), while the
MAX1143 accepts input signals of 0 to +4.096V (unipo-
lar) or ±4.096V (bipolar). Operating from a single
+4.75V to +5.25V analog supply and a +4.75V to
+5.25V digital supply, power-down modes reduce cur-
rent consumption to 1mA at 10ksps and further reduce
supply current to less than 20µA at slower data rates.
A serial strobe output (SSTRB) allows direct connection
to the TMS320-family of digital signal processors. The
MAX1142/MAX1143 user can select either the internal
clock, or an external serial-interface clock for the ADC
to perform analog-to-digital conversions.
The MAX1142/MAX1143 feature internal calibration cir-
cuitry to correct linearity and offset errors. On-demand
calibration allows the user to optimize performance.
Three user-programmable logic outputs are provided
for the control of an 8-channel MUX or a PGA.
Applications
Industrial Process Control
Industrial I/O Modules
Data-Acquisition Systems
Medical Instruments
Portable and Battery-Powered Equipment
Features
♦ 200ksps (Bipolar) and 150ksps (Unipolar)
Sampling ADC
♦ 14-Bits, No Missing Codes
♦ 1LSB INL Guaranteed
♦ 81dB (min) SINAD
♦ +5V Single-Supply Operation
♦ Low Power Operation, 7.5mA (Unipolar Mode)
♦ 2.5µA Shutdown Mode
♦ Software-Configurable Unipolar & Bipolar Input
Ranges
0 to +12V and ±12V (MAX1142)
0 to +4.096V and ±4.096V (MAX1143)
Internal or External Reference
♦ Internal or External Clock
♦ SPI/QSPI/MICROWIRE-Compatible Wire Serial
Interface
♦ Three User-Programmable Logic Outputs
♦ Small 20-Pin SSOP Package
MAX1142/MAX1143
14-Bit ADC, 200ksps, +5V Single-Supply
with Reference
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
CS
SHDN
RST
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
AGND
AIN
CREF
AV DD
AGND
REFADJ
REF
DIN
DV DD
DGND
SCLK
P2
P1
P0
SSTRB
DGND
12
11
9
10 DOUT
MAX1142
MAX1143
SSOP
Pin Configuration
19-2037; Rev 0; 5/01
Ordering Information
PART TEMP. RANGE
PIN-
PACKAGE
INL
(LSB)
MAX1142 ACAP 0
°
C to +70
°
C 20 SSOP
±
1
MAX1142BCAP 0
°
C to +70
°
C 20 SSOP
±
2
Functional Diagram appears at end of data sheet.
Typical Application Circuit appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information continued at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.