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參數資料
| 型號： | AD7751AAN-REF |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | GT 3C 3#8 SKT RECP |
| 中文描述： | 電能計量IC，帶有片上故障檢測 |
| 文件頁數： | 4/16頁 |
| 文件大小： | 249K |
| 代理商： | AD7751AAN-REF |
REV. A
AD7751
–4–
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 AD7751 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.
WARNING!
ESD SENSITIVE DEVICE
ABSOLUTE MAXIMUM RATINGS
*
(T
A
= 25
°
C unless otherwise noted)
AV
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DV
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DV
DD
to AV
DD
. . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
Analog Input Voltage to AGND
V1A, V1B, V1N, V2P, and V2N . . . . . . . . . . –6 V to +6 V
Reference Input Voltage to AGND . . –0.3 V to AV
DD
+ 0.3 V
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
Industrial (A, B Versions) . . . . . . . . . . . . . –40
°
C to +85
°
C
Storage Temperature Range . . . . . . . . . . . . –65
°
C to +150
°
C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150
°
C
24-Lead Plastic DIP, Power Dissipation . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 105
°
C/W
Lead Temperature, (Soldering 10 sec) . . . . . . . . . . . 260
°
C
24-Lead SSOP, Power Dissipation . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 112
°
C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215
°
C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220
°
C
*
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 condi-
tions for extended periods may affect device reliability.
TERMINOLOGY
MEASUREMENT ERROR
The error associated with the energy measurement made by the
AD7751 is defined by the following formula:
Percentage Error =
Energy Registered by the AD7751 – True Energy
True Energy
×
100%
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 10 and 11).
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 an analog input signal of 1 mV to
10 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.
POWER SUPPLY REJECTION
This quantifies the AD7751 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.
GAIN ERROR
The gain error of the AD7751 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
V1A. The difference is expressed as a percentage of the ideal
frequency. The ideal frequency is obtained from the transfer
function—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 output
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.
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