Datasheet

REV. A
AD7719
–6–
Parameter AD7719B Unit Test Conditions
Power Supply Currents (Continued)
AI
DD
Current (Main ADC) 1.1 mA max AV
DD
= 3 V or 5 V, Buffered Mode,
0.85 mA typ
0.55 mA max AV
DD
= 3 V or 5 V, Unbuffered Mode,
0.45 mA typ
AI
DD
Current (Aux ADC) 0.3 mA max AV
DD
= 3 V or 5 V, 0.25 mA typ
AI
DD
Current (Main and Aux ADC) 1.25 mA max AV
DD
= 3 V or 5 V, Main ADC Buffered,
1 mA typ
DI
DD
(ADC Disable Mode)
13
0.35 mA max DV
DD
= 3 V, 0.25 mA typ
0.4 mA max DV
DD
= 5 V, 0.3 mA typ
AI
DD
(ADC Disable Mode) 0.15 mA max AV
DD
= 3 V or 5 V
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
NOTES
1
Temperature range –40°C to +85°C.
2
Guaranteed by design and/or characterization data on production release.
3
System zero calibration will remove this error.
4
A calibration at any temperature will remove this drift error.
5
The main ADC is factory-calibrated with AV
DD
= DV
DD
= 4 V, T
A
= 25°C, REFIN1(+) – REFIN1(–) = 2.5 V. If the user power supplies or temperature conditions
are significantly different from these, internal full-scale calibration will restore this error to the published specification. System calibration can be used to reduce this
error to the order of the noise. Full-scale error applies to both positive and negative full scale.
6
A system full-scale calibration will remove this error.
7
A typical gain error of ±10 µV results following a user self-calibration.
8
Simultaneous 50 Hz and 60 Hz rejection is achieved using 19.8 Hz (SF = 69) update rate. Normal mode rejection in this case is 60 dB min.
9
After a calibration if the analog input exceeds positive full scale, the converter will output all 1s. If the analog input is less than negative full scale, the device will
output all 0s.
10
FS = Full-Scale Input. FS = 1.024 × REFIN1/Gain on the main ADC, where REFIN1 = REFIN1(+) – REFIN1(– ). FS = REFIN2 on the aux ADC when ARN = 1
in the aux ADC control register (AD1CON) and REFIN2/2 on the aux ADC when ARN = 0.
11
Input and output levels on the I/O Port are with respect to AV
DD
and AGND.
12
Normal mode refers to the case where both main and aux ADCs are running.
13
ADC disable is entered by setting both the AD0EN and AD1EN bits in the main and aux ADC control registers to a 0 and setting the mode bits (MD2, MD1,
MD0) in the mode register to non-0.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
1
(T
A
= 25°C, unless otherwise noted.)
AV
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
AV
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DV
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DV
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
AGND to DGND
2
. . . . . . . . . . . . . . . . . . . –20 mV to +20 mV
PWRGND to AGND . . . . . . . . . . . . . . . . –20 mV to +20 mV
AV
DD
to DV
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . –5 V to +5 V
Analog Input Voltage to AGND . . . . –0.3 V to AV
DD
+0.3 V
Reference Input Voltage to AGND . . –0.3 V to AV
DD
+0.3 V
Total AIN/REFIN Current (Indefinite) . . . . . . . . . . . . 30 mA
Digital Input Voltage to DGND . . . . –0.3 V to DV
DD
+0.3 V
Digital Output Voltage to DGND . . . –0.3 V to DV
DD
+0.3 V
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
SOIC Package
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 71.4°C/W
θ
JC
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 23°C/W
TSSOP Package
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 97.9°C/W
θ
JC
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 14°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
AGND and DGND are connected internally within the AD7719.
ORDERING GUIDE
Model Temperature Range Package Description Package Option
AD7719BR –40°C to +85°C SOIC R-28
AD7719BRU –40°C to +85°CTSSOP RU-28
EVAL-AD7719EB Evaluation Board