MAX1108_03 Datasheet, PDF (3/20 Pages) Maxim Integrated Products – Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1108 (continued)
(V_DD = +2.7V to +3.6V; unipolar input mode; COM = GND, f_SCLK = 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-
sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; 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
TRACK/HOLD
Internal clock
Conversion Time (Note 5)
t_{CONV External clock, 500kHz, 10 sclks/conv}
20
35
µs
Track/Hold Acquisition Time
Aperture Delay
t_ACQ External clock, 2MHz
1
µs
10
ns
Aperture Jitter
<50
ps
Internal Clock Frequency
400
kHz
External Clock Frequency Range
For data transfer only
50
500 kHz
2
MHz
INTERNAL REFERENCE
Output Voltage
REF Short-Circuit Current
REF Tempco
V_REF
I_REFSC
(Note 6)
1.968
2.048
150
±50
2.128
V
µA
ppm/°C
Load Regulation
0 to 0.5mA (Note 7)
2.5
mV
Capacitive Bypass at REF
1
µF
EXTERNAL REFERENCE
Input Voltage Range
1.0
V_DD + 0.05 V
Input Current
+2.048V at REF, full scale,
500kHz external clock
1
20
µA
POWER REQUIREMENTS
Supply Voltage
Supply Current (Notes 2, 8)
V_DD
V_DD = 2.7V to 3.6V,
C_L = 10pF
Internal reference
External reference
I_DD V_DD = 5.5V,
C_L = 10pF
Internal reference
External reference
2.7
3
5.5
V
105
250
70
µA
130
µA
95
Power-Supply Rejection (Note 10) PSR
DIGITAL INPUTS (DIN, SCLK, and CS)
Threshold Voltage High
V_IH
Threshold Voltage Low
Input Hysteresis
Input Current High
Input Current Low
Input Capacitance
V_IL
V_HYST
I_IH
I_IL
C_IN
Power down, V_DD = 2.7V to 3.6V (Note 9)
Full-scale input, V_DD = 2.7V to 3.6V
V_DD ≤ 3.6V
V_DD > 3.6V
0.5
2.5
±0.4
±4
mV
2
V
3
V
0.8
V
0.2
V
±1
µA
±1
µA
15
pF
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