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(yè)數(shù)： 7/20頁(yè)
文件大小： 481K
代理商： AD5557
AD5547/AD5557
Pin No.
18
Rev. 0 | Page 7 of 20
Mnemonic
WR
Function
Write Control Digital Input In, Active Low. WR transfers shift register data to the DAC register on the rising edge.
Signal level must be ≤ V
DD
+ 0.3 V.
Address Pin 0. Signal level must be ≤ V
DD
+ 0.3 V.
Address Pin 1. Signal level must be ≤ V
DD
+ 0.3 V.
Digital Input Load DAC Control. Signal level must be ≤ V
DD
+ 0.3 V.
Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The
signal level must be ≤ V
DD
+ 0.3 V.
Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal
level must be ≤ V
DD
+ 0.3 V.
Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V.
19
20
21
22
A0
A1
LDAC
MSB
23
RS
29
VDD
Table 4. AD5557 Pin Function Descriptions
Pin No.
Mnemonic
1, 2
NC
3
R
OFSA
Function
No Connection. Do not connect anything other than dummy pads to these pins.
Bipolar Offset Resistor A. Accepts up to ±18 V. In 2-quadrant mode, R
OFSA
ties to R
FBA
. In 4-quadrant mode, R
OFSA
ties
to R
1A
and the external reference.
Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion.
4-Quandrant Resistor. In 2-quadrant mode, R
1A
shorts to the V
REFA
pin. In 4-quadrant mode, R
1A
ties to R
OFSA
. Do not
connect when operating in unipolar mode.
Center Tap Point of the Two 4-Quadrant Resistors, R
1A
and R
2A
. In 4-quadrant mode, R
COMA
ties to the inverting node
of the reference amplifier. In 2-quadrant mode, R
COMA
shorts to the VREF pin. Do not connect if operating in
unipolar mode.
DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, V
REFA
is the
reference input with constant input resistance versus code. In 4-quadrant mode, V
REFA
is driven by the external
reference amplifier.
DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage output.
DAC A Analog Ground.
Digital Ground.
DAC B Analog Ground.
DAC B Current Output. Connects to inverting terminal of external precision I-V op amp for voltage output.
DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance versus code. If configured
with an external op amp for 4-quadrant multiplying, V
REFB
becomes –V
REF
.
Center Tap Point of the Two 4-Quadrant Resistors, R
1B
and R
2B
. In 4-quadrant mode, R
COMB
ties to the inverting node
of the reference amplifier. In 2-quadrant mode, R
COMB
shorts to the VREF pin. Do not connect if operating in
unipolar mode.
4-Quandrant Resistor. In 2-quadrant mode, R
1B
shorts to the V
REFB
pin. In 4-quadrant mode, R
1B
ties to R
OFSB
. Do not
connect if operating in unipolar mode.
Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion.
Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, R
OFSB
ties to R
FBB
. In 4-quadrant mode, R
OFSB
ties
to R
1B
and an external reference.
Write Control Digital Input In, Active Low. Transfers shift register data to the DAC register on the rising edge. Signal
level must be ≤ V
DD
+ 0.3 V.
Address Pin 0. Signal level must be ≤ V
DD
+ 0.3 V.
Address Pin 1. Signal level must be ≤ V
DD
+ 0.3 V.
Digital Input Load DAC Control. Signal level must be ≤ V
DD
+ 0.3 V.
Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The signal
level must be ≤ V
DD
+ 0.3 V.
Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal
level must be ≤ V
DD
+ 0.3 V.
Digital Input Data Bits D13 to D0. Signal level must be ≤ V
DD
+ 0.3 V.
4
5
R
FBA
R
1A
6
R
COMA
7
V
REFA
8
9
10
11
12
13
I
OUTA
AGNDA
DGND
AGNDB
I
OUTB
V
REFB
14
R
COMB
15
R
1B
16
17
R
FBB
R
OFSB
18
WR
19
20
21
22
A0
A1
LDAC
MSB
23
RS
24–28,
30–38
29
D13 to D0
VDD
Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V.
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