Datasheet
AD7790 Data Sheet
Rev. A | Page 4 of 20
SPECIFICATIONS (continued)
1
Parameter AD7790B Unit Test Conditions/Comments
REFERENCE INPUT (continued)
Normal Mode Rejection
2
@ 50 Hz, 60 Hz 65 dB min 73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 100
4
@ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[2:0] = 101
4
@ 60 Hz 80 dB min 90 dB typ, 60 ± 1 Hz, FS[2:0] = 011
4
Common Mode Rejection
Input Range = ±2.5 V, AIN = 1 V
@ DC 100 dB typ FS[2:0] = 100
4
@ 50 Hz, 60 Hz 110 dB typ 50 ± 1 Hz (FS[2:0] = 101
4
), 60 ± 1 Hz (FS[2:0] = 011
4
)
LOGIC INPUTS
All Inputs Except SCLK
2
V
INL
, Input Low Voltage 0.8 V max V
DD
= 5 V
0.4 V max V
DD
= 3 V
V
INH
, Input High Voltage 2.0 V min V
DD
= 3 V or 5 V
SCLK Only (Schmitt-Triggered Input)
2
V
T
(+) 1.4/2 V min/V max V
DD
= 5 V
V
T
(–) 0.8/1.4 V min/V max V
DD
= 5 V
V
T
(+) – V
T
(–) 0.3/0.85 V min/V max V
DD
= 5 V
V
T
(+) 0.9/2 V min/V max V
DD
= 3 V
V
T
(–) 0.4/1.1 V min/V max V
DD
= 3 V
V
T
(+) - V
T
(–)
0.3/0.85
V min/V max
V
DD
= 3 V
Input Currents ±1 µA max V
IN
= V
DD
or GND
Input Capacitance 10 pF typ All Digital Inputs
LOGIC OUTPUTS
V
OH
, Output High Voltage
2
V
DD
– 0.6 V min V
DD
= 3 V, I
SOURCE
= 100 µA
V
OL
, Output Low Voltage
2
0.4 V max V
DD
= 3 V, I
SINK
= 100 µA
V
OH
, Output High Voltage
2
4 V min V
DD
= 5 V, I
SOURCE
= 200 µA
V
OL
, Output Low Voltage
2
0.4 V max V
DD
= 5 V, I
SINK
= 1.6 mA
Floating-State Leakage Current ±1 µA max
Floating-State Output Capacitance 10 pF typ
Data Output Coding Offset Binary
POWER REQUIREMENTS
5
Power Supply Voltage
V
DD
– GND 2.5/5.25 V min/max
Power Supply Currents
I
DD
Current
6
75 µA max 65 µA typ, V
DD
= 3.6 V, Unbuffered Mode
145 µA max 130 µA typ, V
DD
= 3.6 V, Buffered Mode
80
µA max
73 µA typ, V
DD
= 5.25 V, Unbuffered Mode
160 µA max 145 µA typ, V
DD
= 5.25 V, Buffered Mode
I
DD
(Power-Down Mode) 1 µA max
5
Digital inputs equal to V
DD
or GND.
6
The current consumption can be further reduced by using the ADC in one of the low power modes (see Table 15).