ADE7757ARN Analog Devices Inc, ADE7757ARN Datasheet - Page 5

• Manufacturer Part Number: ADE7757ARN
• Description: IC ENERGY METERING 16-SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADE7757ARN

• Rohs Status: RoHS non-compliant
• Input Impedance: 320 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 5mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Meter Type: Single Phase

Pin No.
1
2, 3
4, 5
6
7
8
9, 10
11
12
13
14
15, 16
REV. A
Mnemonic
V
V2P, V2N
V1N, V1P
AGND
REF
SCF
S1, S0
RCLKIN
REVP
DGND
CF
F2, F1
DD
IN/OUT
Description
Power Supply. This pin provides the supply voltage for the circuitry in the ADE7757. The supply voltage
should be maintained at 5 V
capacitor in parallel with a ceramic 100 nF capacitor.
Analog Inputs for Channel V2 (voltage channel). These inputs provide a fully differential input pair. The
maximum differential input voltage is 165 mV for specified operation. Both inputs have internal ESD
protection circuitry; an overvoltage of 6 V can be sustained on these inputs without risk of permanent
damage.
Analog Inputs for Channel V1 (current channel). These inputs are fully differential voltage inputs with a
maximum signal level of 30 mV with respect to the V1N pin for specified operation. Both 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.
This provides the ground reference for the analog circuitry in the ADE7757, i.e., ADCs and reference.
This pin should be tied to the analog ground plane of the PCB. The analog ground plane is the ground
reference for all analog circuitry, e.g., antialiasing filters, current and voltage sensors, and so forth. For
accurate noise suppression, the analog ground plane should be connected to the digital ground plane at
only one point. A star ground configuration will help to keep noisy digital currents away from the analog
circuits.
This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value
of 2.5 V and a typical temperature coefficient of 20 ppm/ C. An external reference source may also
be connected at this pin. In either case, this pin should be decoupled to AGND with a 1 F tanta-
lum capacitor and a 100 nF ceramic capacitor. The internal reference cannot be used to drive an
external load.
Select Calibration Frequency. This logic input is used to select the frequency on the calibration output
CF. Table III shows calibration frequencies selection.
These logic inputs are used to select one of four possible frequencies for the digital-to-frequency conver-
sion. With this logic input, designers have greater flexibility when designing an energy meter. See the
Selecting a Frequency for an Energy Meter Application section.
To enable the internal oscillator as a clock source to the chip, a precise low temperature drift resistor at a
nominal value of 6.2 k must be connected from this pin to DGND.
This logic output will go high when negative power is detected, i.e., when the phase angle between the
voltage and current signals is greater than 90 . This output is not latched and will be reset when positive
power is once again detected. The output will go high or low at the same time that a pulse is issued on CF.
This provides the ground reference for the digital circuitry in the ADE7757, i.e., multiplier, filters, and
digital-to-frequency converter. This pin should be tied to the digital ground plane of the PCB. The digi-
tal ground plane is the ground reference for all digital circuitry, e.g., counters (mechanical and digital),
MCUs, and indicator LEDs. For accurate noise suppression, the analog ground plane should be con-
nected to the digital ground plane at one point only, i.e., a star ground.
Calibration Frequency Logic Output. The CF logic output provides instantaneous real power informa-
tion. This output is intended for calibration purposes. Also see SCF pin description.
Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic outputs can
be used to directly drive electromechanical counters and 2-phase stepper motors. See the Transfer Func-
tion section.
PIN FUNCTION DESCRIPTIONS
REF
PIN CONFIGURATION
AGND
IN/OUT
SCF
V2P
V2N
V1N
V1P
V
DD
5% for specified operation. This pin should be decoupled with a 10 F
1
2
3
4
5
6
7
8
(Not to Scale)
ADE7757
TOP VIEW
–5–
16
15
14
13
12
11
10
9
F1
F2
CF
DGND
REVP
RCLKIN
S0
S1
ADE7757