Datasheet
MAX1284/MAX1285
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX1285 (continued)
(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
DYNAMIC SPECIFICATIONS (75kHz sine wave, 2.5V
P-P
, f
SAMPLE
= 300ksps, f
SCLK
= 4.8MHz)
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
= 73kHz, f
IN2
= 77kHz 76 dB
Full-Power Bandwidth -3dB point 3
MHz
Full-Linear Bandwidth SINAD > 68dB
250 kHz
CONVERSION RATE
Conversion Time (Note 4)
t
CONV
3.3 µs
Track/Hold Acquisition Time t
ACQ
625
ns
Aperture Delay 10 ns
Aperture Jitter
< 50
ps
Serial Clock Frequency t
SCLK
0.5 4.8
MHz
Duty Cycle 40 60 %
ANALOG INPUT (AIN)
Input Voltage Range V
AIN
0 2.5 V
Input Capacitance 18 pF
INTERNAL REFERENCE
REF Output Voltage V
REF
2.48 2.50 2.52
V
REF Short-Circuit Current T
A
= +25°C 15 mA
REF Output Tempco
TC V
REF
±15 ppm/°C
Load Regulation (Note 5) 0 to 0.75mA 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
2.0 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
= 0.5mA
V
DD
- 0.5
V
Three-State Leakage Current I
L
V
CS
= +3V
±10
µA
Three-State Output Capacitance
C
OUT
V
CS
= +3V 15 pF
POWER SUPPLY
Positive Supply Voltage (Note 6)
VDD 2.7 3.6 V
Positive Supply Current (Note 7)
IDD V
DD
= +3.6V 2.5 3.5 mA
Shutdown Supply Current I
SHDN
SCLK = V
DD
, SHDN = GND 2 10 µA
Power-Supply Rejection PSR V
DD
= +2.7V to 3.6V, midscale input
±0.5 ±2.0
mV