Document
19-2465; Rev 0; 4/02
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14-Bit ADCs, 150ksps, 3.3V Single Supply
General Description 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
MAX1144/MAX1145
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 control) 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 applications. The MAX1144 accepts input signals of 0 to +6V (unipolar) 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 consumption 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 circuitry 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.
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 PINPACKAGE 20 SSOP 20 SSOP 20 SSOP 20 SSOP INL (LSB) ±1 ±2 ±1 ±2
Ordering Information continued at end of data sheet.
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.
TOP VIEW
REF 1 AVDD 2 AGND 3 AVDD 4 DGND 5 SHDN 6 P2 7 P1 8 PO 9
Pin Configuration
20 AIN 19 AGND 18 CREF 17 CS
MAX1144 MAX1145
16 DIN 15 DVDD 14 DGND 13 SCLK 12 RST 11 DOUT
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor, Corp.
SSTRB 10
SSOP
________________________________________________________________ Maxim Integrated Products
1
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.
www.DataSheet4U.com 14-Bit ADCs, 150ksps, 3.3V Single Supply
MAX1144/MAX1145
ABSOLUTE MAXIMUM RATINGS
AVDD to AGND, DVDD to DGND ..............................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V AIN to AGND ....................................................................±16.5V CREF, REF to AGND ................................-0.3V to (AVDD + 0.3V) Digital Inputs to DGND.............................................-0.3V to +6V Digital Outputs to DGND .........................-0.3V to (DVDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW Operating Temperature Ranges MAX114_ _CAP...................................................0°C to +70°C MAX114_ _EAP ................................................-40°C to +85°C Storage Temperature Range .............................-60°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(AVDD = DVDD = 3.3V ±5%, fSCLK = 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input, VREF = 2.048V, CREF = 4.7µF, CCREF = 1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER DC ACCURACY (Note 1.