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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(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 473K |
| 代理商： | AD5554 |
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REV. 0
AD5544/AD5554
–12–
CLOCK FREQUENCY
–
Hz
100
1k
P
–
10k
100k
1M
100
V
DD
= 5V 10%
T
A
= 25 C
90
80
70
60
50
40
30
20
TPC 17. AD5544/AD5554 Power Supply Rejection
vs. Frequency
TEMPERATURE
–
C
55
S
–
–
50
V
DD
= 5V
V
REF
= 10V
LOGIC = V
DD
54
53
52
51
50
49
48
47
46
–
25
0
25
50
75
100
125
150
TPC 18. AD5544/AD5554 Power Supply Current
vs. Temperature
LOGIC INPUT VOLTAGE
–
Volts
600
I
D
–
0
V
DD
= 5V
V
REF
= 10V
T
A
= 25 C
500
400
300
200
100
0
1
2
3
4
5
TPC 19. AD5544/AD5554 Power Supply Current
vs. Logic Input Voltage
CIRCUIT OPERATION
The AD5544 and AD5554 contain four, 16-bit and 14-bit,
current-output, digital-to-analog converters respectively. Each
DAC has its own independent multiplying reference input. Both
AD5544/AD5554 use 3-wire SPI compatible serial data inter-
face, with a configurable asynchronous
RS
pin for half-scale
(MSB = 1) or zero-scale (MSB = 0) preset. In addition, an
LDAC
strobe enables four channel simultaneous updates for
hardware synchronized output voltage changes.
D/A Converter Section
Each part contains four current-steering R-2R ladder DACs.
Figure 4 shows a typical equivalent DAC. Each DAC contains
a matching feedback resistor for use with an external I-to-V
converter amplifier. The R
FB
X pin is connected to the output of
the external amplifier. The I
OUT
X terminal is connected to the
inverting input of the external amplifier. The A
GND
X pin should
be Kelvin-connected to the load point in the circuit requiring
the full 16-bit accuracy. These DACs are designed to operate
with both negative or positive reference voltages. The V
DD
power
pin is only used by the logic to drive the DAC switches ON and
OFF. Note that a matching switch is used in series with the
internal 5 k
feedback resistor. If users are attempting to mea-
sure the value of R
FB
, power must be applied to V
DD
in order to
achieve continuity. An additional V
SS
bias pin is used to guard
the substrate during high temperature applications to minimize
zero-scale leakage currents that double every 10
°
C. The DAC
output voltage is determined by V
REF
and the digital data (D) as:
V
V
OUT
REF
=
×
D
65536
(For AD5544)
(Equation 1)
V
V
OUT
REF
=
×
D
16384
(For AD5554)
(Equation 2)
Note that the output polarity is opposite to the V
REF
polarity for
dc reference voltages.
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