Datasheet
MAX1242/MAX1243
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V; 73ksps; f
S
CLK
= 2.1MHz (50% duty cycle); MAX1242—4.7µF capacitor at REF pin, MAX1243—external
reference; V
REF
= 2.5V applied to REF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
Capacitive Bypass at REF 4.7 µF
Load Regulation (Note 5) 0.35 mV0mA to 0.2mA output load
REF Temperature Coefficient ±30 ppm/°CMAX1242
REF Short-Circuit Current 30 mA
REF Output Voltage 2.470 2.500 2.530 VT
A
= +25°C (Note 4)
Power-Supply Rejection (Note 7) PSR V
DD
= V
DD
(min)
to V
DD
(max)
, full-scale input
1.00 V
DD
+
50mV
Supply Current I
DD
3.0
0.8
V
DD
> 3.6V
I
SINK
= 16mA
Output Voltage High
SCLK, CS Input High Voltage
V
IH
2.0
V
SCLK, CS Input Low Voltage
Capacitive Bypass at REF 0.1 µF
V
IL
0.8
V
DD
≤ 3.6V
V
V
OH
V
DD
- 0.5 V
Three-State Leakage Current I
L
±0.01 ±10
I
SOURCE
= 0.5mA
µA
CS = V
DD
Three-State Output Capacitance C
OUT
15 pF
CS = V
DD
(Note 6)
Output Voltage Low V
OL
0.4
V
PARAMETER SYMBOL MIN TYP MAX UNITS
I
SINK
= 5mA
SHDN Input Mid Voltage
V
SM
1.1 V
DD
- 1.1 V
SHDN Voltage, Open
V
FLT
V
DD
/ 2 V
SHDN Max Allowed Leakage,
Mid Input
±100
SHDN = open
nA
SHDN = open
SCLK, CS Input Capacitance
Input Voltage Range V
C
IN
15 pF
SHDN Input High Voltage
V
SH
V
DD
- 0.4
(Note 6)
V
SHDN Input Low Voltage
V
SL
0.4 V
Input Resistance
SHDN Input Current
±4.0
18 25 kΩ
REF Input Current in Shutdown
µAV
SHDN
= 0V or V
DD
SCLK, CS Input Hysteresis
V
HYST
±0.01 10 µAV
SHDN
= 0V
CONDITIONS
Input Current
0.2 V
SCLK, CS Input Leakage
I
IN
±0.01 ±1
100 150 µA
µAV
IN
= 0V or V
DD
Operating mode (MAX1242)
V
DD
= 5.25V
Operating mode (MAX1243)
V
DD
= 5.25V
V
DD
= 3.6V
Power-down
V
DD
= 5.25V
V
DD
= 3.6V
Supply Voltage V
DD
V
V
DD
= 3.6V
1.9 10
3.5 15
±0.3
1.6 2.5
0.9 1.5
1.8 3.0
1.4 2.0
2.7 5.25
mA
µA
mV
Operating mode (MAX1242)
EXTERNAL REFERENCE (V
REF
= 2.5V)
INTERNAL REFERENCE (MAX1242 only)
DIGITAL INPUTS: SCLK,
CCSS
,
SSHHDDNN
DIGITAL OUTPUT: DOUT
POWER REQUIREMENTS