MAX1270BCAI Datasheet, PDF (4/20 Pages) Maxim Integrated Products – Multirange, +5V, 8-Channel, Serial 12-Bit ADCs

Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(V_DD = +5.0V ±5%; unipolar/bipolar range; external reference mode, V_REF = +4.096V; 4.7µF at REF; external clock; f_CLK = 2.0MHz,
50% duty cycle (MAX127_B); f_CLK = 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T_A = T_MIN to T_MAX, unless
otherwise noted. Typical values are T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
INTERNAL REFERENCE
REF Output Voltage
REF Output Tempco
Output Short-Circuit Current
Load Regulation
Capacitive Bypass at REF
Capacitive Bypass at REFADJ
V_REF
TC V_REF
T_A = +25°C
MAX1270_C/MAX1271_C
MAX1270_E/MAX1271_E
0 to 0.5mA output current (Note 5)
REFADJ Output Voltage
REFADJ Adjustment Range
Figure 1
Buffer Voltage Gain
REFERENCE INPUT (Reference buffer disabled, reference input applied to REF)
Input Voltage Range
Input Current
V_REF = 4.18V
Normal or STBYPD
FULLPD
Input Resistance
V_REF = 4.18V
Normal or STBYPD
FULLPD
REFADJ Threshold for Buffer
Disable
POWER REQUIREMENT
Supply Voltage
Supply Current
V_DD
Bipolar range
Normal
Unipolar range
I_DD
STBYPD power-down mode (Note 6)
FULLPD power-down mode
Power-Supply Rejection
Ratio (Note 7)
PSRR
External reference = 4.096V
Internal reference
TIMING
External Clock Frequency Range
Acquisition Phase
f_SCLK
MAX127_A
MAX127_B
External clock mode
(Note 8)
MAX127_A
MAX127_B
Internal clock mode, Figure 9
MIN TYP MAX UNITS
4.076
4.7
0.01
2.465
4.096
±15
±30
30
2.500
±1.5
1.638
4.116
V
ppm/°C
mA
10
mV
µF
µF
2.535
V
%
V/V
2.40
10
4.18
V_DD -
0.5
4.18
V
400
µA
1
kΩ
MΩ
V
4.75
5.25
V
18
mA
6
10
700 850
µA
120 220
±0.1 ±0.5
LSB
±0.5
0.1
1.8
MHz
0.1
2.0
3.3
3.0
µs
3
5
4 _______________________________________________________________________________________