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參數(shù)資料
| 型號(hào)： | AD7755 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Pulse Output(帶脈沖輸出的高精度電子能量測(cè)量芯片) |
| 中文描述： | 電能計(jì)量IC脈沖輸出（帶脈沖輸出的高精度電子能量測(cè)量芯片） |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 260K |
| 代理商： | AD7755 |
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AD7755
6
PRELIM B2 10/98
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
AD7755. 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
AD7755. 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.
5,6
V1P, V1N
Analog inputs for Channel 1. These inputs are fully differential voltage inputs with a maximum
signal level of ±500mV with respect to pin V1N for specified operation. Channel 1 also has a
PGA and the gain selections are outlined in table I.The maximum signal level at this pin is ±1V
with respect to AGND. Both inputs have internal ESD protection circuitry and in addition an
overvoltage of ±6V can be sustained on these inputs without risk of permanent damage.
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 ±500mV 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 AD7755. 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 AD7755 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 AD7755, 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
AD7755 Transfer Function.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD7755AAN | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk |
| AD7755AAN-REF | 制造商:Analog Devices 功能描述: |
| AD7755AARS | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk 制造商:Analog Devices 功能描述: |
| ad7755aarsrl | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD7755ABRS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
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