MAX1280 Datasheet, PDF (5/24 Pages) Maxim Integrated Products – 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference

400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
ELECTRICAL CHARACTERISTICS—MAX1281 (continued)
(V_DD1 = V_DD2 = +2.7V to +3.6V, COM = GND, f_SCLK = 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external
+2.5V at REF, REFADJ = V_DD1, 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
CONVERSION RATE
Conversion Time (Note 5)
t_CONV Normal operating mode
3.3
µs
Track/Hold Acquisition Time
t_ACQ Normal operating mode
625
ns
Aperture Delay
10
ns
Aperture Jitter
<50
ps
Serial Clock Frequency
f_SCLK
Duty Cycle
ANALOG INPUTS (CH7–CH0, COM)
Input Voltage Range, Single-
Ended and Differential (Note 6)
V_{CH_}
Normal operating mode
Unipolar, V_COM = 0
Bipolar, V_COM or V_{CH_} = V_REF/2,
referenced to COM or CH_
0.5
4.8 MHz
40
60
%
V_REF
V
±V_REF/2
Multiplexer Leakage Current
Input Capacitance
INTERNAL REFERENCE
REF Output Voltage
REF Short-Circuit Current
On/off leakage current, V_{CH_} = 0 or AV_DD
V_REF T_A = +25°C
±0.001 ±1
µA
18
pF
2.480 2.500 2.520
V
15
mA
REF Output Temperature
Coefficient
TC V_REF
±15
ppm/°C
Load Regulation (Note 7)
Capacitive Bypass at REF
Capacitive Bypass at REFADJ
REFADJ Output Voltage
REFADJ Input Range
0 to 0.75mA output load
For small adjustments, from 1.22V
0.1 2.0
4.7
10
0.01
10
1.22
±100
mV/mA
µF
µF
V
mV
REFADJ Buffer Disable
Threshold
To power down the internal reference
1.4
V_DD1 - 1
V
Buffer Voltage Gain
EXTERNAL REFERENCE (Reference buffer disabled, reference applied to REF)
2.05
V/V
REF Input Voltage Range
(Note 8)
1.0
V_DD1 +
50mV
V
REF Input Current
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
Input High Voltage
V_INH
Input Low Voltage
V_INL
Input Hysteresis
V_HYST
Input Leakage
I_IN
Input Capacitance
C_IN
V_REF = 2.500V, f_SCLK = 4.8MHz
V_REF = 2.500V, f_SCLK = 0
In power-down, f_SCLK = 0
V_IN = 0 or V_DD2
200 350
320
µA
5
2.0
V
0.8
V
0.2
V
±1
µA
15
pF
_______________________________________________________________________________________ 5