Electrical characteristics—max1108 (continued) – Rainbow Electronics MAX1109 User Manual
Page 3
µA
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
_______________________________________________________________________________________
3
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.)
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
External clock, 500kHz, 10 sclks/conv
Internal clock
External clock, 2MHz
µs
20
t
CONV
Conversion Time (Note 5)
35
µs
1
t
ACQ
Track/Hold Acquisition Time
ps
<50
Aperture Jitter
ns
10
Aperture Delay
kHz
400
Internal Clock Frequency
(Note 6)
0 to 0.5mA (Note 7)
ppm/°C
±50
REF Tempco
µA
150
I
REFSC
REF Short-Circuit Current
mV
2.5
Load Regulation
kHz
50
500
V
1.968
2.048
2.128
V
REF
Output Voltage
+2.048V at REF, full scale,
500kHz external clock
µA
1
20
Input Current
V
2.7
3
5.5
V
DD
Supply Voltage
Power down, V
DD
= 2.7V to 3.6V
Full-scale input, V
DD
= 2.7V to 3.6V
0.5
2.5
I
DD
mV
±0.4
±4
PSR
Power-Supply Rejection (Note 9)
V
DD
= 2.7V to 3.6V,
C
L
= 10pF
V
DD
= 5.5V,
C
L
= 10pF
105
250
130
µF
1
Capacitive Bypass at REF
V
0.2
V
HYST
Input Hysteresis
V
0.8
V
IL
Threshold Voltage Low
µA
±1
I
IH
Input Current High
V
DD
≤
3.6V
V
DD
> 3.6V
V
2
V
3
V
IH
Threshold Voltage High
MHz
2
External Clock Frequency Range
V
1.0
V
DD
+ 0.05
Input Voltage Range
µA
±1
I
IL
Input Current Low
pF
15
C
IN
Input Capacitance
For data transfer only
Internal reference
External reference
70
Internal reference
External reference
95
µA
Supply Current (Notes 2, 8)
TRACK/HOLD
INTERNAL REFERENCE
EXTERNAL REFERENCE
POWER REQUIREMENTS
DIGITAL INPUTS
(DIN, SCLK, and CS)