參數(shù)資料
型號： ADE7759
廠商： Analog Devices, Inc.
英文描述： Active Energy Metering IC with di/dt Sensor Interface
中文描述： 有源電能計量IC的di / dt傳感器接口
文件頁數(shù)： 11/32頁
文件大?。?/td> 530K
代理商： ADE7759
REV. 0
ADE7759
–11–
GAIN (CH1)
1
4
RB
10
2.5
V
DD
10 F
10 F
100nF
100nF
AVDD DVDD
RESET
DIN
DOUT
SCLK
CS
CLKOUT
CLKIN
IRQ
SAG
ZX
CF
AGND DGND
V1P
V1N
V2N
V2P
REF
IN/OUT
U1
ADE7759
TO SPI BUS
(USED ONLY FOR
CALIBRATION)
22pF
22pF
Y1
3.58MHz
NOT CONNECTED
U3
TO
FREQUENCY
COUNTER
PS2501-1
I
1k
33nF
1k
33nF
1k
33nF
600k
110V
1k
33nF
10 F
100nF
RB
CT TURN RATIO = 1800:1
CHANNEL 2 GAIN = 1
Test Circuit 1. Performance Curve (Integrator OFF)
V
DD
10 F
10 F
100nF
100nF
AVDD DVDD
RESET
DIN
DOUT
SCLK
CS
CLKOUT
CLKIN
IRQ
SAG
ZX
CF
AGND DGND
V1P
V1N
V2N
V2P
REF
IN/OUT
U1
ADE7759
TO SPI BUS
(USED ONLY FOR
CALIBRATION)
22pF
22pF
Y1
3.58MHz
NOT CONNECTED
U3
PS2501-1
I
di/dt CURRENT
SENSOR
100
1k
33nF
33nF
100
1k
33nF
33nF
1k
33nF
600k
110V
1k
33nF
10 F
100nF
CHANNEL 1 GAIN = 4
CHANNEL 2 GAIN = 1
TO
FREQUENCY
COUNTER
Test Circuit 2. Performance Curve (Integrator ON)
ANALOG INPUTS
The ADE7759 has two fully differential voltage input channels.
The maximum differential input voltage for input pairs V1P/V1N
and V2P/V2N are
±
0.5 V. In addition, the maximum signal level
on analog inputs for V1P/V1N and V2P/V2N are
±
0.5 V with
respect to AGND.
Each analog input channel has a PGA (Programmable Gain
Amplifier) with possible gain selections of 1, 2, 4, 8, and 16.
The gain selections are made by writing to the Gain register—
see Figure 5. Bits 0 to 2 select the gain for the PGA in Channel 1
and the gain selection for the PGA in Channel 2 is made via
Bits 5 to 7. Figure 4 shows how a gain selection for Channel 1
is made using the Gain register.
V1P
V1N
V
IN
K V
IN
+
GAIN[7:0]
GAIN (K)
SELECTION
OFFSET ADJUST
( 50mV)
CH1OS[7:0]
BIT 0 to 5: SIGN MAGNITUDE CODED OFFSET CORRECTION
BIT 6: NOT USED
BIT 7: DIGITAL INTEGRATOR (ON = 1, OFF = 0; DEFAULT ON)
Figure 4. PGA in Channel 1
In addition to the PGA, Channel 1 also has a full-scale input
range selection for the ADC. The ADC analog input range
selection is also made using the Gain register—see Figure 2. As
mentioned previously the maximum differential input voltage is
0.5 V. However, by using Bits 3 and 4 in the Gain register, the
maximum ADC input voltage can be set to 0.5 V, 0.25 V, or
0.125 V. This is achieved by adjusting the ADC reference—see
Reference Circuit section. Table I summarizes the maximum
differential input signal level on Channel 1 for the various ADC
range and gain selections.
Table I. Maximum Input Signal Levels for Channel 1
Max Signal
Channel 1
ADC Input Range Selection
0.25 V
0.5 V
0.125 V
0.5 V
0.25 V
0.125 V
0.0625 V
0.0313 V
0.0156 V
0.00781 V
Gain = 1
Gain = 2
Gain = 4
Gain = 8
Gain = 16
Gain = 1
Gain = 2
Gain = 4
Gain = 8
Gain = 16
Gain = 1
Gain = 2
Gain = 4
Gain = 8
Gain = 16
GAIN REGISTER
*
CHANNEL 1 AND CHANNEL 2 PGA CONTROL
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
ADDR:
0AH
*
REGISTER CONTENTS
SHOW POWER-ON DEFAULTS
PGA 2 GAIN SELECT
000 = 1
001 = 2
010 = 4
011 = 8
100 = 16
PGA 1 GAIN SELECT
000 = 1
001 = 2
010 = 4
011 = 8
100 = 16
CHANNEL 1 FULL SCALE SELECT
00 = 0.5V
01 = 0.25V
10 = 0.125V
Figure 5. Analog Gain Register
Test Circuits
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