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參數(shù)資料
| 型號(hào)： | AD5554 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad, Current-Output Serial-Input, 16-Bit/14-Bit DACs |
| 中文描述： | 四，電流輸出串行輸入，16-Bit/14-Bit數(shù)模轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD5554 |
REV. 0
AD5544/AD5554
–13–
V
REF
X
V
SS
DGND
V
DD
R
FB
X
I
OUT
X
A
GND
F
A
GND
X
R
R
R
R
2R
2R
2R
5k
S1
S2
FROM OTHER DACS A
GND
DIGITAL INTERFACE CONNECTIONS OMITTED FOR CLARITY.
SWITCHES S1 AND S2 ARE CLOSED, V
DD
MUST BE POWERED.
Figure 4. Typical Equivalent DAC Channel
These DACs are also designed to accommodate ac reference
input signals. Both AD5544/AD5554 will accommodate input
reference voltages in the range of
–
12 V to +12 V. The reference
voltage inputs exhibit a constant nominal input resistance of
5 k
,
±
30%. On the other hand, the DAC outputs I
OUT
A, B,
C, D are code-dependent and produce various output resis-
tances and capacitances. The choice of external ampli
fi
er
should take into account the variation in impedance generated
by the AD5544/AD5554 on the ampli
fi
ers
’
inverting input
node. The feedback resistance, in parallel with the DAC ladder
resistance, dominates output voltage noise. For multiplying
mode applications, an external feedback compensation capacitor
(C
FB
) may be needed to provide a critically damped output
response for step changes in reference input voltages. Figures 5
and 6 show the gain vs. frequency performance at various
attenuation settings using a 23 pF external feedback capacitor
connected across the I
OUT
X and R
FB
X terminals for AD5544
and AD5554 respectively. In order to maintain good analog
performance, power supply bypassing of 0.01
μ
F, in parallel
with 1
μ
F, is recommended. Under these conditions, clean
power supply with low ripple voltage capability should be used.
Switching power supplies is usually not suitable for this application
due to the higher ripple voltage and PSS frequency-dependent
characteristics. It is best to derive the AD5544/AD5554
’
s 5 V
supply from the systems
’
analog supply voltages. (Do not use
the digital 5 V supply.) See Figure 7.
FREQUENCY
–
Hz
1k
G
–
FFFF
H
B15
B14
B13
B12
B11
B10
10k
100k
1M
10M
100
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
ZS
V
DD
= 5V
V
REF
= 100mV rms
T
A
= 25 C
Figure 5. AD5554 Reference Multiplying Bandwidth
vs. Code
FREQUENCY
–
Hz
1k
G
–
3FFF
H
B13
B12
B11
B10
10k
100k
1M
10M
100
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
ZS
V
DD
= 5V
V
REF
= 100mV rms
T
A
= 25 C
C
F
= 23pF
Figure 6. AD5554 Reference Multiplying Bandwidth
vs. Code
V
REF
X
V
SS
DGND
V
DD
R
FB
X
I
OUT
X
A
GND
F
A
GND
X
R
R
R
R
2R
2R
2R
5k
S1
S2
FROM OTHER DACS A
GND
AD5544
+
A1
15V
V
EE
V
CC
V
OUT
LOAD
2R
R
5V
15V
ANALOG
POWER
SUPPLY
DIGITAL INTERFACE CONNECTIONS OMITTED.
FOR CLARITY SWITCHES S1 AND S2 ARE CLOSED,
V
DD
MUST BE POWERED.
+
Figure 7. Recommended Kelvin-Sensed Hookup
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