Datasheet

MAX11634–MAX11637
12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
4 _______________________________________________________________________________________
Note 2: Limits at T
A
= -40°C are guaranteed by design and not production tested.
Note 3: Tested at V
DD
= 3V (MAX11635/MAX11637); V
DD
= 5V (MAX11634/MAX11636), unipolar input mode.
Note 4: Offset nulled.
Note 5: Time for reference to power up and settle to within 1 LSB.
Note 6: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 7: 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 8: See Figure 3 (Equivalent Input Circuit) and the Sampling Error vs. Source Impedance curve in the
Typical Operating
Characteristics
section.
Note 9: When CNVST is configured as a digital input, do not apply a voltage between V
IL
and V
IH
.
Note 10: 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
= 2.7V to 3.6V (MAX11635/MAX11637), V
DD
= 4.75V to 5.25V (MAX11634/MAX11636), f
SAMPLE
= 300kHz, f
SCLK
= 4.8MHz
(external clock, 50% duty cycle), V
REF
= 2.5V (MAX11635/MAX11637), V
REF
= 4.096V (MAX11634/MAX11636) T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Leakage Current I
IN
V
IN
= 0V 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
Three-State Leakage Current I
L
CS = V
DD
±0.05 ±1 µA
Three-State Output Capacitance C
OUT
CS = V
DD
15 pF
POWER REQUIREMENTS
MAX11634/MAX11636 4.75 5.25
Supply Voltage V
DD
MAX11635/MAX11637 2.7 3.6
V
f
SAMPLE
= 300ksps 1750 2000
f
SAMPLE
= 0, REF on 1000 1200
Internal
reference
Shutdown 0.2 5
f
SAMPLE
= 300ksps 1050 1200
MAX11635/MAX11637
Supply Current (Note 10)
I
DD
External
reference
Shutdown 0.2 5
µA
f
SAMPLE
= 300ksps 2300 2550
f
SAMPLE
= 0, REF on 1050 1350
Internal
reference
Shutdown 0.2 5
f
SAMPLE
= 300ksps 1500
1700
MAX11634/MAX11636
Supply Current (Note 10)
I
DD
External
reference
Shutdown 0.2 5
µA
V
DD
= 2.7V to 3.6V, full-scale input ±0.2 ±1
Power-Supply Rejection PSR
V
DD
= 4.75V to 5.25V, full-scale input ±0.2 ±1.4
mV