MAX1226/MAX1228/MAX1230
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
4 _______________________________________________________________________________________
Note 1: Tested at V
DD
= +5V, unipolar input mode.
Note 2: Offset nulled.
Note 3: Time for reference to power up and settle to within 1 LSB.
Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 5: The operational input voltage range for each individual input of a differentially configured pair is from GND to V
DD
. The
operational input voltage difference is from -V
REF
/2 to +V
REF
/2.
Note 6: See Figure 3 (Input Equivalent Circuit) and the
Sampling Error
vs.
Source Impedance
curve in the
Typical Operating
Characterisitcs
section.
Note 7: Fast automated test, excludes self-heating effects.
Note 8: When CNVST is configured as a digital input, do not apply a voltage between V
IL
and V
IH
.
Note 9: Supply current is specified depending on whether an internal or external reference is used for voltage conversions.
Temperature measurements always use the internal reference.
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, f
SAMPLE
= 300kHz, f
SCLK
= 4.8MHz (50% duty cycle), V
REF
= 4.096V, 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
DIGITAL INPUTS (SCLK, DIN, CS, CNVST)
Input Voltage Low V
IL
(Note 8) 0.8 V
Input Voltage High V
IH
2.0 V
Input Hysteresis V
HYST
200 mV
Input Leakage Current I
IN
V
IN
= 0 or V
DD
±0.01 ±1.0 µA
Input Capacitance C
IN
15 pF
DIGITAL OUTPUTS (DOUT, EOC)
I
SINK
= 2mA 0.4
Output Voltage Low V
OL
I
SINK
= 4mA 0.8
V
Output Voltage High V
OH
I
SOURCE
= 1.5mA V
DD
- 0.5 V
Tri-State Leakage Current I
L
CS = V
DD
±0.05 ±1 µA
Tri-State Output Capacitance C
OUT
CS = V
DD
15 pF
POWER REQUIREMENTS
Supply Voltage V
DD
4.75 5.25 V
During temp sense 2800 3200
f
SAMPLE
= 300ksps 2300 2550
f
SAMPLE
= 0, REF on 1050 1350
Internal
reference
Shutdown 0.2 5
During temp sense 1800 2300
f
SAMPLE
= 300ksps 1600 1700
Supply Current (Note 9) I
DD
External
reference
Shutdown 0.2 5
µA
Power-Supply Rejection PSR V
DD
= 4.75V to 5.25V; full-scale input ±0.2 ±1.4 mV
