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MAX1221 Datasheet, PDF (3/44 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 5.25V, external reference VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C, unless other-
wise noted. Typical values are at AVDD = DVDD = 3V. TA = +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
Acquisition Time
Conversion Time
External-Clock Frequency
Duty Cycle
Aperture Delay
SYMBOL
CONDITIONS
tACQ (Note 5)
Internally clocked
tCONV Externally clocked
fCLK Externally clocked conversion (Note 5)
Aperture Jitter
ANALOG INPUTS
Input Voltage Range (Note 6)
Input Leakage Current
Input Capacitance
Unipolar
Bipolar
INTERNAL TEMPERATURE SENSOR
Measurement Error (Notes 5, 7)
Temperature Resolution
INTERNAL REFERENCE
REF1 Output Voltage
TA = +25°C
TA = TMIN to TMAX
(Note 8)
REF1 Voltage Temperature
Coefficient
TCREF
REF1 Output Impedance
REF1 Short-Circuit Current
EXTERNAL REFERENCE
VREF = 2.5V
REF1 Input Voltage Range
VREF1 REF mode 11 (Note 4)
REF2 Input Voltage Range
(Note 4)
VREF2
REF mode 01
REF mode 11
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
±2.0
°C
°C/LSB
2.482
2.50
2.518
V
±30
ppm/°C
6.5
kΩ
0.39
mA
1
AVDD +
V
0.05
1
AVDD +
0.05
V
0
1
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