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MAX1285BCSA

P1-P3P4-P6P7-P9P10-P12P13-P15
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.
General Description
The MAX1284/MAX1285 12-bit analog-to-digital con-
verters (ADCs) combine a high-bandwidth track/hold
(T/H), a serial interface with high conversion speed, an
internal +2.5V reference, and low power consumption.
The MAX1284 operates from a single +4.5V to +5.5V
supply. The MAX1285 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
conversions.
Low power, ease of use, and small package size make
these converters ideal for remote-sensor and data-acqui-
sition applications or for other circuits with demanding
power consumption and space requirements. The
MAX1284/MAX1285 are available in 8-pin SO packages.
These devices are pin-compatible, higher-speed ver-
sions of the MAX1240/MAX1241. Refer to the respec-
tive data sheets for more information.
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
____________________________Features
o Single-Supply Operation
+4.5V to +5.5V (MAX1284)
+2.7V to +3.6V (MAX1285)
o ±1LSB (max) DNL, ±1LSB (max) INL
o 400ksps Sampling Rate (MAX1284)
o Internal Track/Hold
o +2.5V Internal Reference
o Low Power: 2.5mA (400ksps)
o SPI/QSPI/MICROWIRE 3-Wire Serial-Interface
o Pin-Compatible, High-Speed Upgrades to
MAX1240/MAX1241
o 8-Pin SO Package
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
________________________________________________________________
Maxim Integrated Products
1
19-1687; Rev 2; 12/10
TOP VIEW
1
2
3
4
8
7
6
5
SCLK
CS
DOUT
GND
REF
SHDN
AIN
V
DD
SO
MAX1284
MAX1285
+
Pin Configuration
Ordering Information
Functional Diagram
7
AIN
T/H
DOUT
6
1
OUTPUT
SHIFT
REGISTER
CONTROL
LOGIC
INT
CLOCK
12-BIT
SAR
8
2
3
5
REF
4
SHDN
+2.5V REFERENCE
GND
SCLK
CS
MAX1284
MAX1285
V
DD
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX1284/MAX1285
+
Denotes a lead(Pb)-free/RoHS-compliant package.
PART
TEMP RANGE
PIN-
PACKAGE
SUPPLY
VOLTAGE (V)
MAX1284BCSA+
0°C to +70°C
8 SO 5
MAX1284BESA+
-40°C to +85°C
8 SO 5
MAX1285BCSA+
0°C to +70°C
8 SO 2.7 to 3.6
MAX1285BESA+
-40°C to +85°C
8 SO 2.7 to 3.6
EVALUATION KIT
AVAILABLE
MAX1284/MAX1285
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
2 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX1284
(V
DD
= +4.5V to +5.5V; f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7µF capacitor at REF, T
A
= T
MIN
to
T
MAX,
unless otherwise noted. Typical values are at T
A
= +25°C.)
V
DD
to GND .............................................................-0.3V to +6V
AIN to GND................................................-0.3V to (V
DD
+ 0.3V)
REF to GND ...............................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND...............................................-0.3V to +6V
DOUT to GND............................................-0.3V to (V
DD
+ 0.3V)
DOUT Current..................................................................±25mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C) ..............471mW
Operating Temperature Ranges
MAX1284BCSA/MAX1285BCSA .......................0°C to +70°C
MAX1284BESA/MAX1285BESA .....................-40°C to +85°C
Storage Temperature Range............................-60°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
Soldering Temperature (reflow)......................................+260°C
ABSOLUTE MAXIMUM RATINGS
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.
SYMBOL
MIN TYP MAX
UNITS
Bits
±1.0
LSB
±1.0
LSB
±6.0
LSB
±6.0
LSB
±0.8
ppm/°C
SINAD
MHz
350
kHz
t
CONV
468
< 50
MHz
MAX1284/MAX1285
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—MAX1284 (continued)
(V
DD
= +4.5V to +5.5V; f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7µF capacitor at REF, T
A
= T
MIN
to
T
MAX,
unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS—MAX1285
(V
DD
= +2.7V to +3.6V; f
SCLK
= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), 4.7µF capacitor at REF, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INTERNAL REFERENCE
REF Output Voltage V
REF
2.48 2.50 2.52
V
REF Short-Circuit Current T
A
= +25°C 30 mA
REF Output Tempco
TC V
REF
±15
ppm/°C
Load Regulation (Note 5) 0 to 1mA output load 0.1 2.0
mV/mA
Capacitive Bypass at REF 4.7 10 µF
DIGITAL INPUTS (SCLK, CS, SHDN)
Input High Voltage V
INH
3.0 V
Input Low Voltage V
INL
0.8 V
Input Hysteresis
V
HYST
0.2 V
Input Leakage I
IN
V
IN
= 0V or V
DD
±1 µA
Input Capacitance C
IN
15 pF
DIGITAL OUTPUT (DOUT)
Output Voltage Low V
OL
I
SINK
= 5mA 0.4 V
Output Voltage High V
OH
I
SOURCE
= 1mA 4 V
Three-State Leakage Current I
L
V
CS
= +5V
±10
µA
Three-State Output Capacitance
C
OUT
V
CS
= +5V 15 pF
POWER SUPPLY
Positive Supply Voltage (Note 6)
VDD 4.5 5.5 V
Positive Supply Current (Note 7)
IDD V
DD
= +5.5V 2.5 4.0 mA
Shutdown Supply Current I
SHDN
SCLK = V
DD
, SHDN = GND 2 10 µA
Power-Supply Rejection PSR V
DD
= +5V ±10%, midscale input
±0.5 ±2.0
mV
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
DC ACCURACY (Note 1)
Resolution 12
Bits
Relative Accuracy (Note 2) INL
±1.0
LSB
Differential Nonlinearity DNL No missing codes over temperature
±1.0
LSB
Offset Error
±6.0
LSB
Gain Error (Note 3)
±6.0
LSB
Gain-Error Temperature
Coefficient
±1.6
ppm/°C
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX1285BCSA

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Description:
IC ADC LP 12-BIT 300KSPS 8-SOIC
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