Rainbow Electronics MAX1145 - Manual

General Description
The MAX1144/MAX1145 are 150ksps, 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, clock, and three general-purpose
digital output pins (for external multiplexer or PGA con-
trol) in a 20-pin SSOP package. The excellent dynamic
performance (THD
≥ 90dB), high speed (150ksps in
bipolar mode), and low power (8.0mA) of these ADCs
make them ideal for applications such as industrial
process control, instrumentation, and medical applica-
tions.
The MAX1144 accepts input signals of 0 to +6V (unipo-
lar) or ±6V (bipolar), while the MAX1145 accepts input
signals of 0 to +2.048V (unipolar) or ±2.048V (bipolar).
Operating from a single 3.135V to 3.465V analog digital
supply, powerdown modes reduce current consump-
tion to 0.15mA at 10ksps and further reduce supply
current to less than 20µA slower data rates.
A serial strobe output (SSTRB) allows direct connection
to the TMS320 family digital-signal processors. The
MAX1144/MAX1145 user can select either the internal
clock or an external serial-interface clock for the ADC to
perform analog-to-digital conversions.
The MAX1144/MAX1145 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 PGA.
The MAX1144/MAX1145 are available in a 20-pin SSOP
package and are fully specified over the -40°C to
+85°C temperature range.
Applications
Industrial Process Control
Industrial I/O Modules
Data-Acquisition Systems
Medical Instruments
Portable and Battery-Powered Equipment
Features
♦ 150ksps (Bipolar) and 125ksps (Unipolar)
Sampling ADC
♦ 14 Bits, No Missing Codes
♦ 1LSB INL Guaranteed
♦ -100dB THD
♦ 3.3V Single-Supply Operation
♦ Low-Power Operation
5mA typ (Unipolar Mode)
♦ 1.2µA Shutdown Mode
♦ Software-Configurable Unipolar and Bipolar Input
Ranges
0 to +6V and ±6V (MAX1144)
0 to +2.048V and ±2.048V (MAX1145)
♦ Internal or External Clock
♦ SPI/QSPI/MICROWIRE TMS320-Compatible Serial
Interface
♦ Three User-Programmable Logic Outputs
♦ Small 20-Pin SSOP Package
MAX1144/MAX1145
14-Bit ADCs, 150ksps, 3.3V Single Supply
________________________________________________________________ Maxim Integrated Products 1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
AIN
AGND
CREF
CS AV DD
AGND
AV DD
REF
TOP VIEW
DIN
DV DD
DGND
SCLK P1
P2
SHDN
DGND
12
11
9
10
RST
DOUT SSTRB
PO
MAX1144
MAX1145
SSOP
Pin Configuration
Ordering Information
19-2465; Rev 0; 4/02
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.
Ordering Information continued at end of data sheet.
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
PART
TEMP
RANGE
PIN-
PACKAGE INL
(LSB)
MAX1144ACAP 0 °C to +70°C 20 SSOP ±1
MAX1144BCAP 0 °C to +70°C 20 SSOP ±2
MAX1144AEAP -40 °C to +85°C 20 SSOP ±1
MAX1144BEAP -40 °C to +85°C 20 SSOP ±2
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.