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參數(shù)資料
| 型號： | AD7751 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with On-Chip Fault Detection(高精度容錯電子能量測量芯片) |
| 中文描述： | 電能計量IC片故障檢測（高精度容錯電子能量測量芯片） |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 287K |
| 代理商： | AD7751 |
AD7751
6
PRELIM B1 1098
PIN FUNCTION DESCRIPTION
Pin No.
MNEMONIC
DESCRIPTION
1
DV
DD
Digital power supply. This pin provides the supply voltage for the digital circuitry in the
AD7751. The supply voltage should be maintained at 5V ± 5% for specified operation. This
pin should be decoupled to DGND with a 10μF capacitor in parallel with a ceramic 100nF
capacitor.
2
AC/DC
High pass filter select. This logic input is used to enable the HPF in Channel 1 (the current
channel). A logic one on this pin enables the HPF. The associated phase response of this filter
has been internally compensated over a frequency range of 45Hz to 65Hz. The HPF filter
should be enabled in power metering applications.
3
AV
DD
Analog power supply. This pin provides the supply voltage for the analog circuitry in the
AD7751. The supply should be maintained at 5V ± 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 graphs in this data sheet show power supply rejection
performance. This pin should be decoupled to AGND with a 10μF capacitor in parallel with a
ceramic 100nF capacitor.
4,5
V1A, V1B
Analog inputs for Channel 1. These inputs are fully differential voltage inputs with a maximum
signal level of ±660mV with respect to pin V1N for specified operation. The maximum signal
level at these pins is ±1V with respect to AGND. Both inputs have internal ESD protection
circuitry and an overvoltage of ±6V can also be sustained on these inputs without risk of
permanent damage.
6
V1N
Negative input pin for differential voltage inputs V1A and V1B. The maximum signal level at
this pin is ±1V with respect to AGND. The input has internal ESD protection circuitry and in
addition an overvoltage of ±6V can be sustained without risk of permanent damage. This input
should be connected directly to one side of the SHUNT or BURDEN resistor and held at a
fixed potential, i.e. AGND . See Analog Input section.
7,8
V2N, V2P
Negative and positive inputs for Channel 2 (voltage channel). These inputs provide a fully
differential input pair. The maximum differential input voltage is ±660mV for specified
operation. The maximum signal level at these pins is ±1V with respect to AGND. Both inputs
have internal ESD protection circuitry and an overvoltage of ±6V can also be sustained on these
inputs without risk of permanent damage.
9
RESET
Reset pin for the AD7751. A logic low on this pin will hold the ADCs and digital circuitry in a
reset condition. This pin may be used to hold the AD7751 in reset until the power supplies
have settled after power up—see Using the Reset Pin.
10
REF
IN/OUT
This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal
value of 2.5V ± 8% and a typical temperature coefficient of 55ppm/°C. An external reference
source may also be connected at this pin. In either case this pin should be decoupled to AGND
with a 1μF ceramic capacitor.
11
AGND
This provides the ground reference for the analog circuitry in the AD7751, 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. anti aliasing filters, current and
voltage transducers, etc. For good noise suppression the analog ground plane should only
connected to the digital ground plane at the DGND pin.
12
SCF
Select Calibration Frequency. This logic input is used to select the frequency on the calibration
output CF. Table IV shows how the calibration frequencies are selected.
13,14
S1, S0
These logic inputs are used to select one of four possible frequencies for the digital to frequency
conversion. This offers the designer greater flexibility when designing the energy meter. See
AD7751 Transfer Function.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7751AAN | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
| AD7751AAN-REF | 制造商:Analog Devices 功能描述: |
| AD7751AARS | 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
| AD7751ABRS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC With On-Chip Fault Detection |
| AD7751AN | 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
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