Datasheet

MX7705
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3V or 5V, GND = 0, V
REF+
= 1.225V for V
DD
= 3V and V
REF+
= 2.5V for V
DD
= 5V, V
REF-
= GND, external f
CLKIN
=
2.4576MHz, CLKDIV bit = 0, C
REF+
to GND = 0.1µF, C
REF
- to GND = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Gain = 1 34
Gain = 2 38
Gain = 4 45
AIN Input Capacitance
Gain = 8 to 128 60
pF
AIN Input Sampling Rate f
s
Gain = 1 to 128
f
CLKIN
/
64
MHz
Gain = 1 96
Gain = 2 105
Gain = 4 110
V
DD
= 5V
Gain = 8 to 128 130
Gain = 1 105
Gain = 2 110
Gain = 4 120
Input Common-Mode Rejection CMR
V
DD
= 3V
Gain = 8 to 128 130
dB
Normal-Mode 50Hz Rejection
For filter notches of 25Hz, 50Hz,
±0.02 × f
NOTCH
98 dB
Normal-Mode 60Hz Rejection
For filter notches of 20Hz, 60Hz,
±0.02 × f
NOTCH
98 dB
Common-Mode 50Hz Rejection
For filter notches of 25Hz, 50Hz,
±0.02 × f
NOTCH
150 dB
Common-Mode 60Hz Rejection
For filter notches of 20Hz, 60Hz,
±0.02 × f
NOTCH
150 dB
EXTERNAL REFERENCE (REF+, REF-)
V
DD
= 4.75V to 5.25V 1.0 3.5
REF Differential Input Voltage
Range (Note 9)
V
REF
V
DD
= 2.7V to 3.6V 1.00 1.75
V
RE F Ab sol ute Inp ut V ol tag e Rang e GND V
DD
V
REF Input Capacitance Gain = 1 to 128 10 pF
REF Input Sampling Rate f
s
f
CLKIN
/
64
MHz
DIGITAL INPUTS (DIN, SCLK, CS, RESET)
Input High Voltage V
IH
2V
V
DD
= 4.75V to 5.25V 0.8
Input Low Voltage V
IL
V
DD
= 2.7V to 3.6V 0.4
V
DIN, CS, RESET 250
Input Hysteresis V
HYST
SCLK 500
mV
Input Current I
IN
±1 µA
Input Capacitance 5pF