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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1112 Datasheet

+5V / Low-Power / Multi-Channel / Serial 8-Bit ADCs

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19-1231; Rev 2; 4/11
EVAALVUAAILTAIOBNLEKIT
+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
General Description
The MAX1112/MAX1113 low-power, 8-bit, 8-channel
analog-to-digital converters (ADCs) feature an internal
track/hold, voltage reference, clock, and serial inter-
face. They operate from a single 4.5V to 5.5V supply
and consume only 135µA while sampling at rates up to
50ksps. The MAX1112’s 8 analog inputs and the
MAX1113’s 4 analog inputs are software-configurable,
allowing unipolar/bipolar and single-ended/differential
operation.
Successive-approximation conversions are performed
using either the internal clock or an external serial-inter-
face clock. The full-scale analog input range is deter-
mined by the 4.096V internal reference, or by an
externally applied reference ranging from 1V to VDD.
The 4-wire serial interface is compatible with the SPI™,
QSPI™, and MICROWIRE™ serial-interface standards.
A serial-strobe output provides the end-of-conversion
signal for interrupt-driven processors.
The MAX1112/MAX1113 have a software-program-
mable, 2µA automatic power-down mode to minimize
power consumption. Using power-down, the supply
current is reduced to 13µA at 1ksps, and only 82µA at
10ksps. Power-down can also be controlled using the
SHDN input pin. Accessing the serial interface automat-
ically powers up the device.
The MAX1112 is available in a 20-pin SSOP package.
The MAX1113 is available in a small 16-pin QSOP
package.
________________________Applications
Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4mA to 20mA-Powered Remote
Data-Acquisition Systems
____________________________Features
4.5V to 5.5V Single Supply
Low Power: 135µA at 50ksps
13µA at 1ksps
8-Channel Single-Ended or 4-Channel Differential
Inputs (MAX1112)
4-Channel Single-Ended or 2-Channel Differential
Inputs (MAX1113)
Internal Track/Hold; 50kHz Sampling Rate
Internal 4.096V Reference
SPI/QSPI/MICROWIRE-Compatible Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
Total Unadjusted Error: ±1 LSB (max)
±0.3 LSB (typ)
Ordering Information continued at end of data sheet.
Functional Diagram
CS
SCLK
DIN
SHDN
CH0
CH1
CH2
CH3
CH4*
CH5*
CH6*
CH7*
COM
REFOUT
REFIN
INPUT
SHIFT
REGISTER
CONTROL
LOGIC
INT
CLOCK
ANALOG
INPUT
MUX
T/H
+4.096V
REFERENCE
OUTPUT
SHIFT
REGISTER
CLOCK
IN
8-BIT
SAR ADC
OUT
REF
MAX1112
MAX1113
DOUT
SSTRB
VDD
DGND
AGND
Pin Configurations appear at end of data sheet.
*MAX1112 ONLY
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1112 Datasheet

+5V / Low-Power / Multi-Channel / Serial 8-Bit ADCs

No Preview Available !

+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND............................................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
CH0–CH7, COM, REFIN,
REFOUT to AGND ...................................-0.3V to (VDD + 0.3V)
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs to DGND ............................-0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.30mW/°C above +70°C) .....................667mW
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Ranges
MAX1112CAP/MAX1113CEE...............................0°C to +70°C
MAX1112EAP/MAX1113EEE ............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°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 = 4.5V to 5.5V; unipolar input mode; VCOM = 0V; fSCLK = 500kHz, external clock (50% duty cycle); 10 clocks/conversion cycle
(50ksps); 1µF capacitor at REFOUT; TA = TMIN to TMAX; unless otherwise noted.)
PARAMETER
DC ACCURACY
Resolution
Relative Accuracy (Note 1)
Differential Nonlinearity
Offset Error
Gain Error (Note 2)
Gain Temperature Coefficient
Total Unadjusted Error
SYMBOL
CONDITIONS
INL
DNL
No missing codes over temperature
Internal or external reference
External reference, 4.096V
TUE
MIN TYP MAX UNITS
8 Bits
±0.1 ±0.5 LSB
±1 LSB
±0.3 ±1 LSB
±1 LSB
±0.8
ppm/°C
±0.3 ±1 LSB
Channel-to-Channel
Offset Matching
±0.1
LSB
DYNAMIC SPECIFICATIONS (10.034kHz sine-wave input, 4.096VP-P, 50ksps, 500kHz external clock)
Signal-to-Noise
and Distortion Ratio
SINAD
49
dB
Total Harmonic Distortion
(Up to the 5th Harmonic)
THD
-70 dB
Spurious-Free Dynamic Range
Channel-to-Channel Crosstalk
Small-Signal Bandwidth
Full-Power Bandwidth
SFDR
VCH_ = 4.096VP-P, 25kHz (Note 3)
-3dB rolloff
68 dB
-75 dB
1.5 MHz
800 kHz
2 _______________________________________________________________________________________


Part Number MAX1112
Description +5V / Low-Power / Multi-Channel / Serial 8-Bit ADCs
Maker Maxim
Total Page 20 Pages
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