Datasheet

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.
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
±0.8
ppm/°C
DYNAMIC SPECIFICATIONS (100kHz sine wave, 2.5V
P-P
, clock = 6.4MHz)
Signal-to-Noise Plus Distortion
Ratio
SINAD
70 dB
Total Harmonic Distortion THD Up to the 5th harmonic -80 dB
Spurious-Free Dynamic Range SFDR 80 dB
Intermodulation Distortion IMD f
IN1
= 99Hz, f
IN2
= 102Hz 76 dB
Full-Power Bandwidth -3dB point 6
MHz
Full-Linear Bandwidth SINAD > 68dB
350
kHz
CONVERSION RATE
Conversion Time (Note 4)
t
CONV
2.5 µs
Track/Hold Acquisition Time t
ACQ
468
ns
Aperture Delay 10 ns
Aperture Jitter
< 50
ps
Serial Clock Frequency t
SCLK
0.5 6.4
MHz
Duty Cycle 40 60 %
ANALOG INPUT (AIN)
Input Voltage Range V
AIN
0 2.5 V
Input Capacitance 18 pF