參數(shù)資料
型號(hào): AD5557
廠商: Analog Devices, Inc.
英文描述: Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
中文描述: 雙路電流輸出,并行輸入,16-/14-Bit乘法數(shù)模轉(zhuǎn)換器4象限電阻
文件頁數(shù): 17/20頁
文件大?。?/td> 481K
代理商: AD5557
AD5547/AD5557
AC Reference Signal Attenuator
Besides handling the digital waveform decoded from the
parallel input data, the AD5547/AD5557 can also handle low
frequency ac reference signals for signal attenuation, channel
equalization, and waveform generation applications. The
maximum signal range can be up to ±18 V (See Figure 25).
Rev. 0 | Page 17 of 20
System Calibration
The initial accuracy of the system can be adjusted by trimming
the voltage reference ADR0x with a digital potentiometer (see
Figure 26). The AD5170 provides a one-time programmable
(OTP), 8-bit adjustment that is ideal and reliable for such
calibration. ADI’s OTP digital potentiometer comes with
programmable software that simplifies factory calibration.
WR
WR
RS
RS
2
LDAC
0
AD5547/AD5557
16/14 DATA
VDD
R
OFSA
R
FBA
C6
RFB
ROFS
MSB A0, A1
I
OUTA
AGNDA
C2
0.1
μ
F
C1
1
μ
F
V
OUTA
MSB
A0, A1
LDAC
+10V
–10V
+5V
OP2177
C7
R
1A
R
COMA
R2
R1
V
REFA
16-/14-BIT
C4
+15V
U2B
1
μ
F
0.1
μ
F
C5
C8
1
μ
F
0.1
μ
F
C9
OP2177
–V
+V
U2A
U1
–15V
Figure 25. Signal Attenuator with AC Reference
WR
WR
RS
RS
2
LDAC
0
AD5547/AD5557
16/14 DATA
VDD
R
OFSA
R
FBA
C6
RFB
ROFS
MSB A0, A1
I
OUTA
U2B
+5V
AGNDA
C1
1
μ
F
C2
0.1
μ
F
C3
0.1
μ
F
V
OUTA
MSB
A0, A1
LDAC
REF 01/AD
4
5
10k
B
1k
6
U3
AD5170
R7
R3
+2.5V
U4
U2
470k
2
+5V
0V TO +2.5V
–2.5V
AD8628
C7
R
1A
R
COMA
R2
U1
R1
V
REFA
16-/14-BIT
GND
ADR03
VOUT
TRIM
VIN
C4
1
μ
F
0.1
μ
F
C5
AD8628
–V
+V
Figure 26. Full-Span Calibration
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