MAX157/MAX159 19-1388 Rev 0 11/98 +2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin MAX General Description Features The MAX157/MAX159 low-power, 10-bit analog-to-digi- Single-Supply Operation (+2.7V to +5.25V) tal converters (ADCs) are available in 8-pin MAX and Two Single-Ended Channels (MAX157) DIP packages. Both devices operate with a single +2.7V to +5.25V supply and feature a 7.4s succes- Single Pseudo-Differential Channel (MAX159) sive-approximation ADC, automatic power-down, fast Low Power wake-up (2.5s), an on-chip clock, and a high-speed, 0.9mA (at 108ksps, +3V) 3-wire serial interface. 100A (at 10ksps, +3V) Power consumption is only 3.2mW (V = +3.6V) at the DD 10A (at 1ksps, +3V) maximum sampling rate of 108ksps. At slower through- <0.2A (power-down mode) put rates, the 0.2A automatic shutdown further Internal Track/Hold reduces power consumption. The MAX157 provides 2-channel, single-ended opera- 108ksps Sampling Rate tion and accepts input signals from 0 to V . The REF SPI/QSPI/MICROWIRE-Compatible 3-Wire MAX159 accepts pseudo-differential inputs ranging Serial Interface from 0 to V . An external clock accesses data REF through the 3-wire serial interface, which is SPI, Space-Saving 8-Pin MAX Package QSPI, and MICROWIRE compatible. Pin-Compatible 12-Bit Upgrades Available Excellent dynamic performance and low power, com- bined with ease of use and a small package size, make these converters ideal for battery-powered and data acquisition applications, or for other circuits with demanding power-consumption and space require- Ordering Information ments. For pin-compatible 12-bit upgrades, see the MAX144/MAX145 data sheet. TEMP. PIN- INL PART RANGE PACKAGE (LSB) Applications MAX157ACUA 0C to +70C 8 MAX 0.5 Battery-Powered Systems Instrumentation MAX157BCUA 0C to +70C 8 MAX 1 Portable Data Logging Test Equipment MAX157ACPA 0C to +70C 8 Plastic DIP 0.5 Isolated Data Acquisition Medical Instruments MAX157BCPA 0C to +70C 8 Plastic DIP 1 MAX157AEUA -40C to +85C 8 MAX 0.5 Process-Control Monitoring System Supervision MAX157BEUA -40C to +85C 8 MAX 1 MAX157AEPA -40C to +85C 8 Plastic DIP 0.5 Pin Configuration MAX157BEPA -40C to +85C 8 Plastic DIP 1 MAX157AMJA -55C to +125C 8 CERDIP* 0.5 TOP VIEW MAX157BMJA -55C to +125C 8 CERDIP* 1 MAX159ACUA 0C to +70C 8 MAX 0.5 V 1 8 SCLK DD MAX159BCUA 0C to +70C 8 MAX 1 MAX159ACPA 0C to +70C 8 Plastic DIP 0.5 CH0 (CH+) 2 7 DOUT MAX157 MAX159BCPA 0C to +70C 8 Plastic DIP 1 MAX159 CH1 (CH-) 3 6 CS/SHDN MAX159AEUA -40C to +85C 8 MAX 0.5 GND 4 5 REF MAX159BEUA -40C to +85C 8 MAX 1 MAX159AEPA -40C to +85C 8 Plastic DIP 0.5 MAX/DIP MAX159BEPA -40C to +85C 8 Plastic DIP 1 MAX159AMJA -55C to +125C 8 CERDIP* 0.5 ( ) ARE FOR MAX159 ONLY. MAX159BMJA -55C to +125C 8 CERDIP* 1 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. *Contact factory for availability. Maxim Integrated Products 1 For free samples & the latest literature: +2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin MAX ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Ranges DD CH0, CH1 (CH+, CH-) to GND...................-0.3V to (V + 0.3V) MAX157/MAX159 C A .......................................0C to +70C DD REF to GND................................................-0.3V to (V + 0.3V) MAX157/MAX159 E A ....................................-40C to +85C DD Digital Inputs to GND ...............................................-0.3V to +6V MAX157/MAX159 MJA................................. -55C to +125C DOUT to GND.............................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD DOUT Sink Current ............................................................ 25mA Lead Temperature (soldering, 10sec) .............................+300C Continuous Power Dissipation (T = +70C) A MAX (derate 4.1mW/C above +70C) ......................330mW Plastic DIP (derate 9.09mW/C above +70C) ............727mW CERDIP (derate 8.00mW/C above +70C).................640mW 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 (V = +2.7V to +5.25V, V = 2.5V, 0.1F capacitor at REF, f = 2.17MHz, 16 clocks/conversion cycle (108ksps), DD REF SCLK CH- = GND for MAX159, T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution RES 10 Bits MAX15 A 0.5 Relative Accuracy (Note 2) INL LSB MAX15 B 1 Differential Nonlinearity DNL No missing codes over temperature 0.5 LSB Offset Error 2 LSB Gain Error (Note 3) 2 LSB Gain Temperature Coefficient External reference, V = 2.5V 0.8 ppm/C REF Channel-to-Channel Offset 0.02 LSB Matching Channel-to-Channel Gain 0.02 LSB Matching DYNAMIC SPECIFICATIONS (f (sine wave) = 10kHz, V = 2.5Vp-p, 108ksps, external f = 2.17MHz, CH- = GND for MAX159) IN IN SCLK Signal-to-Noise Ratio plus SINAD 66 dB Distortion Total Harmonic Distortion THD -70 dB (including 5th-order harmonic) Spurious-Free Dynamic Range SFDR 70 dB Channel-to-Channel Crosstalk f = 65kHz, V = 2.5Vp-p (Note 4) -75 dB IN IN Small-Signal Bandwidth -3dB rolloff 2.25 MHz Full-Power Bandwidth 1.0 MHz 2 MAX157/MAX159