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MAX1284/MAX1285
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX1285 (continued)
(VDD = +2.7V to +3.6V; fSCLK = 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), 4.7F capacitor at REF, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC SPECIFICATIONS (75kHz sine wave, 2.5VP-P, fSAMPLE = 300ksps, fSCLK = 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
fIN1 = 73kHz, fIN2 = 77kHz
76
dB
Full-Power Bandwidth
-3dB point
3
MHz
Full-Linear Bandwidth
SINAD > 68dB
250
kHz
CONVERSION RATE
Conversion Time (Note 4)
tCONV
3.3
s
Track/Hold Acquisition Time
tACQ
625
ns
Aperture Delay
10
ns
Aperture Jitter
< 50
ps
Serial Clock Frequency
tSCLK
0.5
4.8
MHz
Duty Cycle
40
60
%
ANALOG INPUT (AIN)
Input Voltage Range
VAIN
0
2.5
V
Input Capacitance
18
pF
INTERNAL REFERENCE
REF Output Voltage
VREF
2.48
2.50
2.52
V
REF Short-Circuit Current
TA = +25°C
15
mA
REF Output Tempco
TC VREF
±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
F
DIGITAL INPUTS (SCLK, CS, SHDN)
Input High Voltage
VINH
2.0
V
Input Low Voltage
VINL
0.8
V
Input Hysteresis
VHYST
0.2
V
Input Leakage
IIN
VIN = 0V or VDD
±1
A
Input Capacitance
CIN
15
pF
DIGITAL OUTPUT (DOUT)
Output Voltage Low
VOL
ISINK = 5mA
0.4
V
Output Voltage High
VOH
ISOURCE = 0.5mA
VDD - 0.5
V
Three-State Leakage Current
IL
V
CS = +3V
±10
A
Three-State Output Capacitance
COUT
V
CS = +3V
15
pF
POWER SUPPLY
Positive Supply Voltage (Note 6)
VDD
2.7
3.6
V
Positive Supply Current (Note 7)
IDD
VDD = +3.6V
2.5
3.5
mA
Shutdown Supply Current
I
SHDN
SCLK = VDD, SHDN = GND
2
10
A
Power-Supply Rejection
PSR
VDD = +2.7V to 3.6V, midscale input
±0.5
±2.0
mV
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