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ADE7758 View Datasheet(PDF) - Analog Devices

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ADE7758 Datasheet PDF : 72 Pages
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Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADE7758
APCF 1
24 DOUT
DGND 2
23 SCLK
DVDD 3
22 DIN
AVDD 4
21 CS
IAP 5 ADE7758 20 CLKOUT
IAN 6 TOP VIEW 19 CLKIN
(Not to Scale)
IBP 7
18 IRQ
IBN 8
17 VARCF
ICP 9
16 VAP
ICN 10
15 VBP
AGND 11
14 VCP
REFIN/OUT 12
13 VN
Figure 5. Pin Configuration
Table 4. Pin Function Descriptions
Pin
No. Mnemonic Description
1
APCF
Active Power Calibration Frequency (APCF) Logic Output. It provides active power information. This output
is used for operational and calibration purposes. The full-scale output frequency can be scaled by writing to
the APCFNUM and APCFDEN registers (see the Active Power Frequency Output section).
2
DGND
This provides the ground reference for the digital circuitry in the ADE7758, that is, the multiplier, filters, and
digital-to-frequency converter. Because the digital return currents in the ADE7758 are small, it is acceptable to
connect this pin to the analog ground plane of the whole system. However, high bus capacitance on the DOUT
pin can result in noisy digital current that could affect performance.
3
DVDD
Digital Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7758. The supply
voltage should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled to DGND with
a 10 μF capacitor in parallel with a ceramic 100 nF capacitor.
4
AVDD
Analog Power Supply. This pin provides the supply voltage for the analog circuitry in the ADE7758. The supply
should be maintained at 5 V ± 5% for specified operation. Every effort should be made to minimize power
supply ripple and noise at this pin by the use of proper decoupling. The Typical Performance Characteristics
show the power supply rejection performance. This pin should be decoupled to AGND with a 10 μF capacitor
in parallel with a ceramic 100 nF capacitor.
5, 6, IAP, IAN,
7, 8, IBP, IBN,
9, 10 ICP, ICN
Analog Inputs for Current Channel. This channel is used with the current transducer and is referenced in this
document as the current channel. These inputs are fully differential voltage inputs with maximum differential
input signal levels of ±0.5 V, ±0.25 V, and ±0.125 V, depending on the gain selections of the internal PGA (see
the Analog Inputs section). All inputs have internal ESD protection circuitry. In addition, an overvoltage
of ±6 V can be sustained on these inputs without risk of permanent damage.
11
AGND
This pin provides the ground reference for the analog circuitry in the ADE7758, that is, ADCs, temperature sensor,
and reference. This pin should be tied to the analog ground plane or the quietest ground reference in the system.
This quiet ground reference should be used for all analog circuitry, for example, antialiasing filters, current, and
voltage transducers. To keep ground noise around the ADE7758 to a minimum, the quiet ground plane should be
connected to the digital ground plane at only one point. It is acceptable to place the entire device on the analog
ground plane.
12
REFIN/OUT
This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value of
2.4 V ± 8% and a typical temperature coefficient of 30 ppm/°C. An external reference source can also be
connected at this pin. In either case, this pin should be decoupled to AGND with a 1 μF ceramic capacitor.
13, 14, VN, VCP,
15, 16 VBP, VAP
Analog Inputs for the Voltage Channel. This channel is used with the voltage transducer and is referenced as
the voltage channels in this document. These inputs are single-ended voltage inputs with the maximum signal
level of ±0.5 V with respect to VN for specified operation. These inputs are voltage inputs with maximum input
signal levels of ±0.5 V, ±0.25 V, and ±0.125 V, depending on the gain selections of the internal PGA (see the
Analog Inputs section). All inputs have internal ESD protection circuitry, and in addition, an overvoltage of
±6 V can be sustained on these inputs without risk of permanent damage.
Rev. E | Page 9 of 72
 

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