MAX1144-MAX1145 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 14-Bit ADCs, 150ksps, 3.3V Single Supply

19-2465; Rev 0; 4/02
14-Bit ADCs, 150ksps, 3.3V Single Supply
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
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
Features
o 150ksps (Bipolar) and 125ksps (Unipolar)
Sampling ADC
o 14 Bits, No Missing Codes
o 1LSB INL Guaranteed
o -100dB THD
o 3.3V Single-Supply Operation
o Low-Power Operation
5mA typ (Unipolar Mode)
o 1.2µA Shutdown Mode
o Software-Configurable Unipolar and Bipolar Input
Ranges
0 to +6V and ±6V (MAX1144)
0 to +2.048V and ±2.048V (MAX1145)
o Internal or External Clock
o SPI/QSPI/MICROWIRE TMS320-Compatible Serial
Interface
o Three User-Programmable Logic Outputs
o Small 20-Pin SSOP Package
Ordering Information
PART
MAX1144ACAP
MAX1144BCAP
MAX1144AEAP
MAX1144BEAP
TEMP
RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
20 SSOP
20 SSOP
20 SSOP
20 SSOP
INL
(LSB)
±1
±2
±1
±2
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
REF 1
AV_DD 2
AGND 3
AV_DD 4
DGND 5
SHDN 6
P2 7
P1 8
PO 9
SSTRB 10
MAX1144
MAX1145
SSOP
20 AIN
19 AGND
18 CREF
17 CS
16 DIN
15 DV_DD
14 DGND
13 SCLK
12 RST
11 DOUT
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