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Part: MAX187CE
Category:
Data Conversion
-> ADC (Analog to Digital Converters)
Description: MAX187, MAX189 +5V, Low-Power, 12-Bit Serial ADCs
Company: Maxim Integrated Products
Datasheet: Download MAX187CE datasheet File size : 505 kB
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Datasheet text preview:
19-0196; Rev 0; 10/93
NUAL KIT MA ATION HEET EVALU DATA S WS FOLLO
+5V, Low-Power, 12-Bit Serial ADCs
________________________________Features
o o o o o 12-Bit Resolution ±1/2 LSB Integral Nonlinearity (MAX187A/MAX189A) Internal Track/Hold, 75kHz Sampling Rate Single +5V Operation Low Power: 2µA Shutdown Current 1.5mA Operating Current o Internal 4.096V Buffered Reference (MAX187) o 3-Wire Serial Interface, Compatible with SPI, QSPI, and Microwire o Small-Footprint 8-Pin DIP and 16-Pin SO
__________________General Description
T h e MAX187/MAX189 serial 12-bit analog-to-digital converters (ADCs) operate from a single +5V supply and accept a 0V to 5V analog input. Both parts feature a n 8.5µs successive-approximation ADC, a fast track/hold (1.5µs), an on-chip clock, and a high-speed 3-wire serial interface. T h e MAX187/MAX189 digitize signals at a 75ksps throughput rate. An external clock accesses data from t h e interface, which communicates without external hardware to most digital signal processors and microc o n t r o l l e r s . The interface is compatible with SPITM, QSPITM, and MicrowireTM. The MAX187 has an on-chip buffered reference, and the MAX189 requires an external reference. Both the MAX187 and MAX189 save space with 8-pin DIP and 1 6-pi n SO packages. Power consumption is 7.5mW and reduces to only 10µW in shutdown. Excellent AC characteristics and very low power consumption combined with ease of use and small package size make these converters ideal for remote DSP and sensor applications, or for circuits where power consumption and space are crucial.
MAX187/MAX189
_________________Ordering Information
PART MAX187ACPA MAX187BCPA MAX187CCPA MAX187ACWE MAX187BCWE MAX187CCWE MAX187BC/D TEMP. RANGE PIN-PACKAGE ERROR (LSB) 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 8 Plastic DIP 8 Plastic DIP 8 Plastic DIP 16 Wide SO 16 Wide SO 16 Wide SO Dice* ±1/2 ±1 ±2 ±1/2 ±1 ±2 ±1
___________________________Applications
Portable Data Logging Remote Digital Signal Processing Isolated Data Acquisition High-Accuracy Process Control
Ordering Information continued on last page. * Dice are specified at TA = +25°C, DC parameters only. ** Contact factory for availability and processing to MIL-STD-883.
________________Functional Diagram
OS TPUT U R HIFT EGISTER 6 DOUT 8 SCLK
_________________Pin Configurations
T O P VIEW
GND
5 AV = 1.638 +2.5V R BANDGAP EFERENCE (MAX187 ONLY) 10k (4.096V)
REFDAC REF+
VDD AIN 1S-BIT 2 AR
1 2
8 7
SCLK CS DOUT GND
REF AIN
4 2
SHDN 3 REF 4
MAX187 AX189
6 5
T/H COMPARATOR
MAX187 AX189
VDD 1
7 N BUFFER ENABLE/DISABLE COA TROL T ND IMING 3
DIP
CS SHDN
NOTE: PIN NUMBERS SHOWN ARE FOR 8-PIN DIPs ONLY.
Pin Configurations continued on last page.
TM SPI and QSPI are trademarks of Motorola. Microwire is a trademark of National Semiconductor.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
+5V, Low-Power, 12-Bit Serial ADCs MAX187/MAX189
ABSOLUTE MAXIMUM RATINGS
VDD to GND ....-0.3V to +6V AIN to GND......-0.3V to (VDD + 0.3V) REF to GND .....-0.3V to (VDD + 0.3V) Digital Inputs to GND.........-0.3V to (VDD + 0.3V) Digital Outputs to GND......-0.3V to (VDD + 0.3V) SHDN to GND............-0.3V to (VDD + 0.3V) REF Load Current (MAX187) .......4.0mA Continuous REF Short-Circuit Duration (MAX187)........20sec DOUT Current .........±20mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..500mW 16-Pin Wide SO (derate 8.70mW/°C above +70°C) ...478mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C) ......440mW Operating Temperature Ranges: MAX187_C_ _/MAX189_C_ _.....0°C to +70°C MAX187_E_ _/MAX189_E_ _ ..-40°C to +85°C MAX187_MJA/MAX189_MJA .....-55°C to +125°C Storage Temperature Range....-60°C to +150°C Lead Temperature (soldering, 10sec) ....+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
(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, external clock (50% duty cycle); MAX187--internal reference: VREF = 4.096V, 4.7µF capacitor at REF pin, or MAX189--external reference: VREF = 4.096V applied to REF pin, 4.7µF capacitor at REF pin; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER DC ACCURACY (Note 1) Resolution MAX18_A Relative Accuracy (Note 2) MAX18_B MAX18_C Differential Nonlinearity Offset Error DNL No missing codes over temperature MAX18_A MAX18_B/C MAX187 Gain Error (Note 3) MAX189A MAX189B/C Gain Temperature Coefficient External reference, 4.096V ±0.8 12 ±1/2 ±1 ±2 ±1 ±1
1
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bits
LSB
LSB LSB
/2
±3 ±3 ±1 ±3 ppm/°C LSB
DYNAMIC SPECIFICATIONS (10kHz sine wave input, 0V to 4.096Vp-p, 75ksps) Signal-to-Noise plus Distortion Ratio Total Harmonic Distortion (up to the 5th harmonic) Spurious-Free Dynamic Range Small-Signal Bandwidth Full-Power Bandwidth SINAD THD SFDR Rolloff -3dB 80 4.5 0.8 70 -80 dB dB dB MHz MHz
2
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+5V, Low-Power, 12-Bit Serial ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5V ±5%; GND = 0V; unipolar input mode; 75ksps, fCLK = 4.0MHz, external clock (50% duty cycle); MAX187--internal reference: VREF = 4.096V, 4.7µF capacitor at REF pin, or MAX189--external reference: VREF = 4.096V applied to REF pin, 4.7µF capacitor at REF pin; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER CONVERSION RATE Conversion Time Track/Hold Acquisition Time Throughput Rate Aperture Delay Aperture Jitter ANALOG INPUT Input Voltage Range Input Capacitance (Note 4) INTERNAL REFERENCE (MAX187 only, reference buffer enabled) TA = +25°C REF Output Voltage VREF TA = TMIN to TMAX REF Short-Circuit Current MAX187AC/BC REF Tempco MAX187AE/BE MAX187AM/BM MAX187C Load Regulation (Note 5) 0mA to 0.6mA output load ±30 ±30 ±30 ±30 1 mV MAX187_C MAX187_E MAX187_M 4.076 4.060 4.050 4.040 4.096 4.116 4.132 4.140 4.150 30 ±50 ±60 ±80 ppm/°C mA V 16 0 to VREF V pF tAPR tCONV tACQ External clock, 4MHz, 13 clocks 10 <50 5.5 1.5 75 8.5 µs µs ksps ns ps SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX187/MAX189
EXTERNAL REFERENCE AT REF (Buffer disabled, VREF = 4.096V) Input Voltage Range Input Current Input Resistance Shutdown REF Input Current 12 2.50 200 20 1.5 10 VDD + 50mV 350 V µA k µA
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