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| MAX1220 Datasheet, PDF (3/47 Pages) Maxim Integrated Products – 12-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports | |||
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12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1257), external reference VREF = 2.5V (MAX1257), AVDD = 4.75V to 5.25V, DVDD = 2.7V to AVDD
(MAX1220/MAX1258), external reference VREF = 4.096V (MAX1220/MAX1258), fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C,
unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1257), AVDD = DVDD = 5V (MAX1220/MAX1258), TA = +25°C.
Outputs are unloaded, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Acquisition Time
tACQ (Note 5)
Conversion Time
Internally clocked
tCONV Externally clocked
External Clock Frequency
Duty Cycle
fCLK Externally clocked conversion (Note 5)
Aperture Delay
Aperture Jitter
ANALOG INPUTS
Input Voltage Range (Note 6)
Unipolar
Bipolar
Input Leakage Current
Input Capacitance
INTERNAL TEMPERATURE SENSOR
Measurement Error (Notes 5, 7)
Temperature Resolution
TA = +25°C
TA = TMIN to TMAX
INTERNAL REFERENCE
REF1 Output Voltage (Note 8)
MAX1257
MAX1220/MAX1258
MIN
TYP MAX UNITS
0.6
µs
5.5
µs
3.6
0.1
3.6
MHz
40
60
%
30
ns
< 50
ps
0
-VREF / 2
VREF
V
+VREF / 2
±0.01
±1
µA
24
pF
±0.7
±1.0
1/8
±3.0
°C
°C/LSB
2.482 2.50 2.518
V
4.066 4.096 4.126
REF1 Voltage Temperature
Coefficient
TCREF
±30
ppm/°C
REF1 Output Impedance
REF1 Short-Circuit Current
EXTERNAL REFERENCE
VREF = 2.5V
VREF = 4.096V
6.5
kâ¦
0.39
mA
0.63
REF1 Input Voltage Range
VREF1 REF mode 11 (Note 4)
1
AVDD +
0.05
V
REF2 Input Voltage Range
(Note 4)
VREF2
REF mode 01
REF mode 11
1
AVDD +
0.05
V
0
1
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