Datasheet

AD7794/AD7795
Rev. D | Page 6 of 36
Parameter
1
AD7794/AD7795 Unit Test Conditions/Comments
BIAS VOLTAGE GENERATOR
V
BIAS
AV
DD
/2 V nom
V
BIAS
Generator Start-Up Time ms/nF typ
Dependent on the capacitance connected to AIN;
See
Figure 11
TEMPERATURE SENSOR
Accuracy ±2 °C typ Applies if user calibrates the temperature sensor
Sensitivity 0.81 mV/°C typ
LOW-SIDE POWER SWITCH
R
ON
7 Ω max AV
DD
= 5 V
9 Ω max AV
DD
= 3 V
Allowable Current
2
30 mA max Continuous current
DIGITAL OUTPUTS (P1 and P2)
V
OH
, Output High Voltage
2
AV
DD
− 0.6 V min AV
DD
= 3 V, I
SOURCE
= 100 μA
V
OL
, Output Low Voltage
2
0.4 V max AV
DD
= 3 V, I
SINK
= 100 μA
V
OH
, Output High Voltage
2
4 V min AV
DD
= 5 V, I
SOURCE
= 200 μA
V
OL
, Output Low Voltage
2
0.4 V max AV
DD
= 5 V, I
SINK
= 800 μA
INTERNAL/EXTERNAL CLOCK
Internal Clock
Frequency
2
64 ± 3%
kHz
min/max
Duty Cycle 50:50 % typ
External Clock
Frequency 64 kHz nom
A 128 kHz external clock can be used if the divide-by-2
function is used (Bit CLK1 = CLK0 = 1)
Duty Cycle 45:55 to 55:45 % typ
Applies for external 64 kHz clock, a 128 kHz clock can
have a less stringent duty cycle
LOGIC INPUTS
CS
2
V
INL
, Input Low Voltage 0.8 V max DV
DD
= 5 V
0.4 V max DV
DD
= 3 V
V
INH
, Input High Voltage 2.0 V min DV
DD
= 3 V or 5 V
SCLK (Schmitt-Triggered Input),
CLK, and DIN
2
AD7794B/AD7795B
V
T
(+) 1.4/2 V min/max DV
DD
= 5 V
V
T
(−) 0.8/1.7 V min/max DV
DD
= 5 V
V
T
(+) to V
T
(−) 0.1/0.17 V min/max DV
DD
= 5 V
V
T
(+) 0.9/2 V min/max DV
DD
= 3 V
V
T
(−) 0.4/1.35 V min/max DV
DD
= 3 V
V
T
(+) to V
T
(−) 0.06/0.13 V min/max DV
DD
= 3 V
AD7794C
V
T
(+) 1.35/2.05 V min/max DV
DD
= 5 V
V
T
(−) 0.8/1.9 V min/max DV
DD
= 5 V
V
T
(+) to V
T
(−) 0.1/0.19 V min/max DV
DD
= 5 V
V
T
(+) 0.9/2 V min/max DV
DD
= 3 V
V
T
(−) 0.4/1.35 V min/max DV
DD
= 3 V
V
T
(+) to V
T
(−) 0.06/0.15 V min/max DV
DD
= 3 V
Input Currents ±10 μA max V
IN
= DV
DD
or GND
Input Capacitance 10 pF typ All digital inputs