Datasheet
REV. 0
–5–
AD7708/AD7718
Parameter B Grade Unit Test Conditions
LOGIC INPUTS (Continued)
SCLK Only (Schmitt-Triggered Input)
2
V
T(+)
1.4/2 V min/V max DV
DD
= 5 V
V
T(–)
0.8/1.4 V min/V max DV
DD
= 5 V
V
T(+)
– V
T(–)
0.3/0.85 V min/V max DV
DD
= 5 V
V
T(+)
0.95/2 V min/V max DV
DD
= 3 V
V
T(–)
0.4/1.1 V min/V max DV
DD
= 3 V
V
T(+)
–V
T(–)
0.3/0.85 V min/V max DV
DD
= 3 V
XTAL1 Only
2
V
INL
, Input Low Voltage 0.8 V max DV
DD
= 5 V
V
INH
, Input High Voltage 3.5 V min DV
DD
= 5 V
V
INL
, Input Low Voltage 0.4 V max DV
DD
= 3 V
V
INH
, Input High Voltage 2.5 V min DV
DD
= 3 V
Input Currents ±10 µA max Logic Input = DV
DD
–70 µA max
Logic Input = DGND, Typical –40 µA @ 5 V
and –20 µA at 3 V
Input Capacitance 10 pF typ All Digital Inputs
LOGIC OUTPUTS (Excluding XTAL2)
5
V
OH
, Output High Voltage
2
DV
DD
– 0.6 V min DV
DD
= 3 V, I
SOURCE
= 100 µA
V
OL
, Output Low Voltage
2
0.4 V max DV
DD
= 3 V, I
SINK
= 100 µA
V
OH
, Output High Voltage
2
4V minDV
DD
= 5 V, I
SOURCE
= 200 µA
V
OL
, Output Low Voltage
2
0.4 V max DV
DD
= 5 V, I
SINK
= 1.6 mA
Floating State Leakage Current ±10 µA max
Floating State Output Capacitance ±10 pF typ
Data Output Coding Binary Unipolar Mode
Offset Binary Bipolar Mode
SYSTEM CALIBRATION
2
Full-Scale Calibration Limit 1.05 × FS V max
Zero-Scale Calibration Limit –1.05 × FS V min
Input Span 0.8 × FS V min
2.1 × FS V max
START-UP TIME
From Power-On 300 ms typ
From Power-Down Mode 1 ms typ Oscillator Enabled
300 ms typ Oscillator Powered Down
POWER REQUIREMENTS
Power Supply Voltages AV
DD
and DV
DD
can be operated independently of each other.
AV
DD
–AGND 2.7/3.6 V min/max AV
DD
= 3 V nom
4.75/5.25 V min/max AV
DD
= 5 V nom
DV
DD
–DGND 2.7/3.6 V min/max DV
DD
= 3 V nom
4.75/5.25 V min DV
DD
= 5 V nom
DI
DD
(Normal Mode) 0.55 mA max DV
DD
= 3 V, 0.43 mA typ
0.65 mA max DV
DD
= 5 V, 0.5 mA typ
AI
DD
(Normal Mode) 1.1 mA max AV
DD
= 3 V or 5 V, 0.85 mA typ
DI
DD
(Power-Down Mode) 10 µA max DV
DD
= 3 V, 32.768 kHz Osc. Running
2 µA max DV
DD
= 3 V, Oscillator Powered Down
30 µA max DV
DD
= 5 V, 32.768 kHz Osc. Running
8 µA max DV
DD
= 5 V, Oscillator Powered Down
AI
DD
(Power-Down Mode) 1 µA max AV
DD
= 3 V or 5 V
Power Supply Rejection (PSR) Input Range = ±2.56 V, AIN = 1 V
Chop Disabled 70 dB min 95 dB typ
Chop Enabled 100 dB typ
NOTES
1
Temperature range is –40°C to +85°C.
2
Not production tested, guaranteed by design and/or characterization data at release.
3
Following a self-calibration this error will be in the order of the noise for the programmed gain and update selected. A system calibration will completely remove this error.
4
Recalibration at any temperature will remove these errors.
5
I/O Port Logic Levels are with respect to AV
DD
and
AGND.
Specifications are subject to change without notice.