參數(shù)資料
型號(hào): AD5546
廠商: Analog Devices, Inc.
元件分類: DAC
英文描述: Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
中文描述: 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): 6/16頁(yè)
文件大小: 683K
代理商: AD5546
AD5546/AD5556
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Rev. 0 | Page 6 of 16
0
AD5546
TOP VIEW
(Not to Scale)
D7
1
V
DD
D8
28
D6
2
27
D5
3
D9
26
D4
4
D10
25
D3
5
D11
24
D2
6
D12
23
D1
7
D13
22
D0
8
D14
21
R
OFS
R
FB
R1
11
9
D15
20
10
GND
19
RS
18
R
COM
REF
13
12
MSB
17
WR
16
I
OUT
14
LDAC
15
Figure 3.AD5546 Pin Configuration
0
AD5556
TOP VIEW
(Not to Scale)
NC = NO CONNECT
D5
1
V
DD
D6
28
D4
2
27
D3
3
D7
26
D2
4
D8
25
D1
5
D9
24
D0
6
D10
23
NC
7
D11
22
NC
8
D12
21
R
OFS
R
FB
R1
11
9
D13
20
10
GND
19
RS
18
R
COM
REF
13
12
MSB
17
WR
16
I
OUT
14
LDAC
15
Figure 4. AD5556 Pin Configuration
Table 3. AD5546 Functional Descriptions
Pin No.
Mnemonic
1–8
D7 to D0
9
R
OFS
Description
Digital Input Data Bits D7 to D0. Signal level must be ≤ V
DD
+ 0.3 V.
Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to R
FB
. In 4-quadrant mode ties to R1 and
external reference.
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to R
OFS
.
Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the
reference amplifier. In 2-quadrant mode, shorts to REF pin.
DAC Reference Input in 2-Quadrant Mode and R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, this is the
reference input with constant input resistance versus code. In 4-quadrant mode, this pin is driven by the external
reference amplifier.
DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
Digital Input Load DAC Control. Signal level must be ≤ V
DD
+ 0.3 V.
Write Control Digital Input in Active Low. Transfers shift-register data to DAC register on rising edge. Signal level
must be ≤ V
DD
+ 0.3 V.
Power-On Reset State. MSB = 0 resets at zero scale, MSB = 1 resets at midscale. Signal level must be ≤ V
DD
+ 0.3 V.
Reset in Active Low. Resets to zero scale if MSB = 0, and resets to midscale if MSB = 1. Signal level must be
≤ V
DD
+ 0.3 V.
Analog and Digital Grounds.
Digital Input Data Bits D15 to D14. Signal level must be ≤ V
DD
+ 0.3 V.
Digital Input Data Bits D13 to D8. Signal level must be ≤ V
DD
+ 0.3 V.
Positive Power Supply Input. Specified range of operation: 2.7 V to 5.5 V.
10
11
12
R
FB
R1
R
COM
13
REF
14
15
16
I
OUT
LDAC
WR
17
18
MSB
RS
19
20–21
22–27
28
Table 4. AD5556 Functional Descriptions
Pin No.
Mnemonic
1–6
D5 to D0
7–8
NC
9
R
OFS
GND
D15 to D14
D13 to D8
V
DD
Description
Digital Input Data Bits D5 to D0. Signal level must be
V
DD
+0.3 V.
No Connection. User should not connect anything other than dummy pads on these terminals.
Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to RFB. In 4-quadrant mode ties to R1 and
external reference.
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to R
OFS
.
Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the
reference amplifier. In 2-quadrant mode, shorts to REF pin.
DAC Reference Input in 2-Quadrant Mode and R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, this is the
reference input with constant input resistance versus code. In 4-quadrant mode, this pin is driven by the external
reference amplifier.
DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
10
11
12
R
FB
R1
R
COM
13
REF
14
I
OUT
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