Typical operating characteristics, Electrical characteristics—max1109 (continued) – Rainbow Electronics MAX1109 User Manual
Page 7
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
_______________________________________________________________________________________
7
ELECTRICAL CHARACTERISTICS—MAX1109 (continued)
(V
DD
= +4.5V to +5.5V; unipolar input mode; COM = GND, f
SCLK
= 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values
are at T
A
= +25°C.)
CONDITIONS
External reference
Internal reference (Note 10)
µs
20
ns
200
t
CL
SCLK Pulse Width Low
ms
12
t
WAKE
Wake-Up Time
ns
0
t
CSH
CS to SCLK Rise Hold
ns
100
t
CSS
CS to SCLK Rise Setup
ns
200
t
CH
SCLK Pulse Width High
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Note 1:
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 2:
See
Typical Operating Characteristics
.
Note 3:
V
REF
= +2.048V (MAX1108), V
REF
= +4.096V (MAX1109), offset nulled.
Note 4:
Common-mode range (CH0, CH1, COM) GND to V
DD
.
Note 5:
Conversion time defined as the number of clock cycles times the clock period; clock has 50% duty cycle (Figures 6 and 8).
Note 6:
REF supplies typically 2.5mA under normal operating conditions.
Note 7:
External load should not change during the conversion for specified accuracy.
Note 8:
Power consumption with CMOS levels.
Note 9:
Measured as
V
FS
(2.7V) - V
FS
(3.6V)
for MAX1108, and measured as
V
FS
(4.5V) - V
FS
(5.5V)
for MAX1109.
Note 10:
1µF at REF, internal reference settling to 0.5LSB.
Typical Operating Characteristics
(V
DD
= +3.0V (MAX1108), V
DD
= +5.0V (MAX1109); external conversion mode; f
SCLK
= 500kHz; 50ksps; external reference; 1µF at
REF; T
A
= +25°C; unless otherwise noted.)
200
0
0
6
SUPPLY CURRENT vs. SUPPLY VOLTAGE
40
20
180
160
MAX1108/09-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
1
2
3
4
5
140
120
100
80
60
D
OUT
= 10101010
MAX1108 (2.7V TO 5.5V)
MAX1109 (4.5V TO 5.5V)
INTERNAL REFERENCE
C
LOAD
= 47pF
C
LOAD
= 10pF
200
0
-40
100
SUPPLY CURRENT vs. TEMPERATURE
40
20
180
160
MAX1108/09-02
TEMPERATURE (°C)
SUPPLY CURRENT (
µ
A)
-20
0
20
40
60
80
140
120
100
80
60
V
DD
= 5V
V
DD
= 3V
D
OUT
= 10101010
C
LOAD
= 10pF
INTERNAL REFERENCE
0.50
0
2.5
5.5
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.10
0.05
0.45
0.40
MAX1108/09-03
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
µ
A)
3.0
3.5
4.0
4.5
5.0
0.35
0.30
0.25
0.20
0.15