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Maxim Integrated Semiconductor Electronic Components Datasheet


MAX1084

Serial 10-Bit ADCs



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MAX1084 pdf
19-1686; Rev 1; 12/10
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
General Description
The MAX1084/MAX1085 10-bit analog-to-digital convert-
ers (ADCs) combine a high-bandwidth track/hold, a serial
interface with high conversion speed, an internal +2.5V
reference, and low power consumption. The MAX1084
operates from a single +4.5V to +5.5V supply; the
MAX1085 operates from a single +2.7V to +3.6V supply.
The 3-wire serial interface connects directly to
SPI™/QSPI™/MICROWIRE™ devices without external
logic. The devices use an external serial-interface clock to
perform successive-approximation analog-to-digital con-
versions.
Low power combined with ease of use and small pack-
age size make these converters ideal for remote-sensor
and data-acquisition applications, or for other circuits with
demanding power consumption and space requirements.
The MAX1084/MAX1085 are available in 8-pin SO
packages.
These devices are pin-compatible, higher-speed versions
of the MAX1242/MAX1243; for more information, refer to
the respective data sheets.
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
Pin Configuration
Features
Single-Supply Operation
+4.5V to +5.5V (MAX1084)
+2.7V to +3.6V (MAX1085)
10-Bit Resolution
400ksps Sampling Rate (MAX1084)
Internal Track/Hold
Internal +2.5V Reference
Low Power: 2.5mA (400ksps)
SPI/QSPI/MICROWIRE 3-Wire Serial Interface
Pin-Compatible, High-Speed Upgrade to
MAX1242/MAX1243
8-Pin SO Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX1084ACSA+ 0°C to +70°C 8 SO
MAX1084BCSA+ 0°C to +70°C 8 SO
MAX1084AESA+ -40°C to +85°C 8 SO
MAX1084BESA+ -40°C to +85°C 8 SO
MAX1085ACSA+ 0°C to +70°C 8 SO
MAX1085BCSA+ 0°C to +70°C 8 SO
MAX1085AESA+ -40°C to +85°C 8 SO
MAX1085BESA+ -40°C to +85°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
INL
(LSB)
±1/2
±1
±1/2
±1
±1/2
±1
±1/2
±1
Functional Diagram
TOP VIEW
+
VDD 1
AIN 2
SHDN 3
REF 4
MAX1084
MAX1085
8 SCLK
7 CS
6 DOUT
5 GND
SO
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
CS
SCLK
7
8
SHDN 3
AIN 2
4
REF
VDD
1
CONTROL
LOGIC
T/H
2.5V
REFERENCE
INT
CLOCK
10-BIT
SAR
OUTPUT
SHIFT
REGISTER
6 DOUT
MAX1084
MAX1085
5
GND
________________________________________________________________ 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.



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MAX1084 pdf
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
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 +6V
DOUT to GND............................................-0.3V to (VDD + 0.3V)
DOUT Current ..................................................................±25mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C) ..............471mW
Operating Temperature Ranges
MAX1084_CSA/MAX1085_CSA.........................0°C to +70°C
MAX1084_ESA/MAX1085_ESA ......................-40°C to +85°C
Storage Temperature Range............................-60°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—MAX1084
(VDD = +4.5V to +5.5V, fSCLK = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7µF capacitor at REF, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
DC ACCURACY (Note 1)
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Resolution
10 Bits
Relative Accuracy (Note 2)
MAX1084A
INL
MAX1084B
±0.5
±1.0
LSB
Differential Nonlinearity
DNL No missing codes over temperature
±1.0 LSB
Offset Error
±4.0 LSB
Gain Error (Note 3)
±3.0 LSB
Gain-Error Temperature
Coefficient
±0.8
ppm/°C
DYNAMIC SPECIFICATIONS (100kHz sine wave, 2.5VP-P, clock = 6.4MHz)
Signal-to-Noise Plus Distortion
Ratio
SINAD
60 dB
Total Harmonic Distortion
THD Up to the 5th harmonic
-70 dB
Spurious-Free Dynamic Range SFDR
70 dB
Intermodulation Distortion
Full-Power Bandwidth
IMD fIN1 = 99kHz, fIN2 =102kHz
-3dB point
76 dB
6 MHz
Full-Linear Bandwidth
CONVERSION RATE
SINAD > 58dB
350 kHz
Conversion Time (Note 4)
Track/Hold Acquisition Time
Aperture Delay
tCONV
tACQ
2.5 µs
468 ns
10 ns
Aperture Jitter
< 50
ps
Serial Clock Frequency
Duty Cycle
ANALOG INPUT (AIN)
fSCLK
0.5 6.4 MHz
40 60 %
Input Voltage Range
Input Capacitance
VAIN
0 2.5 V
18 pF
2 _______________________________________________________________________________________



Part Number MAX1084
Description Serial 10-Bit ADCs
Maker Maxim - Maxim
Total Page 16 Pages
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