AD7755AAN Analog Devices Inc, AD7755AAN Datasheet - Page 4

• Manufacturer Part Number: AD7755AAN
• Manufacturer: Analog Devices Inc

Specifications of AD7755AAN

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 24
• Mounting: Through Hole
• Package Type: PDIP
• Screening Level: Industrial
• Lead Free Status / Rohs Status: Not Compliant

TERMINOLOGY
MEASUREMENT ERROR
The error associated with the energy measurement made by the
AD7755 is defined by the following formula:
PHASE ERROR BETWEEN CHANNELS
The HPF (High Pass Filter) in Channel 1 has a phase lead
response. To offset this phase response and equalize the phase
response between channels, a phase correction network is also
placed in Channel 1. The phase correction network matches the
phase to within 0.1 over a range of 45 Hz to 65 Hz and 0.2
over a range 40 Hz to 1 kHz. See Figures 22 and 23.
POWER SUPPLY REJECTION
This quantifies the AD7755 measurement error as a percentage
of reading when the power supplies are varied.
For the ac PSR measurement a reading at nominal supplies
(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced
onto the supplies and a second reading obtained under the same
input signal levels. Any error introduced is expressed as a per-
centage of reading—see Measurement Error definition.
For the dc PSR measurement a reading at nominal supplies
(5 V) is taken. The supplies are then varied 5% and a second
reading is obtained with the same input signal levels. Any error
introduced is again expressed as a percentage of reading.
AD7755
ABSOLUTE MAXIMUM RATINGS
(T
AV
DV
DV
Analog Input Voltage to AGND
Reference Input Voltage to AGND . . –0.3 V to AV
Digital Input Voltage to DGND . . . –0.3 V to DV
Digital Output Voltage to DGND . . –0.3 V to DV
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . . –65 C to +150 C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150 C
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7755 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
Percentage Error
A
V1P, V1N, V2P and V2N . . . . . . . . . . . . . . . –6 V to +6 V
Industrial (A, B Versions) . . . . . . . . . . . . . –40 C to +85 C
DD
= +25 C unless otherwise noted)
DD
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
to AV
DD
Energy Registered by the AD7755 – True Energy
. . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
True Energy
DD
DD
DD
+ 0.3 V
+ 0.3 V
+ 0.3 V
100%
24-Lead Plastic DIP, Power Dissipation . . . . . . . . . . 450 mW
24-Lead SSOP, Power Dissipation . . . . . . . . . . . . . . 450 mW
ADC OFFSET ERROR
This refers to the dc offset associated with the analog inputs to
the ADCs. It means that with the analog inputs connected to
AGND, the ADCs still see a small dc signal (offset). The offset
decreases with increasing gain in channel V1. This specification
is measured at a gain of 1. At a gain of 16, the dc offset is typi-
cally less than 1 mV. However, when the HPF is switched on,
the offset is removed from the current channel and the power
calculation is not affected by this offset.
GAIN ERROR
The gain error of the AD7755 is defined as the difference between
the measured output frequency (minus the offset) and the ideal
output frequency. It is measured with a gain of 1 in channel V1.
The difference is expressed as a percentage of the ideal frequency.
The ideal frequency is obtained from the AD7755 transfer func-
tion—see Transfer Function section.
GAIN ERROR MATCH
The gain error match is defined as the gain error (minus the
offset) obtained when switching between a gain of 1 and a
gain of 2, 8, or 16. It is expressed as a percentage of the out-
put frequency obtained under a gain of 1. This gives the gain
error observed when the gain selection is changed from 1 to 2,
8 or 16.
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.
Lead Temperature, (Soldering 10 sec) . . . . . . . . . . . . 260 C
Lead Temperature, Soldering
JA
JA
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215 C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 C
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 105 C/W
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 112 C/W
WARNING!
ESD SENSITIVE DEVICE