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參數資料
| 型號： | 5962-87701032A |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | DUAL, PARALLEL, 8 BITS INPUT LOADING, 0.18 us SETTLING TIME, 8-BIT DAC, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數： | 6/10頁 |
| 文件大小： | 196K |
| 代理商： | 5962-87701032A |
AD7528
REV. B
–5–
Table I. Unipolar Binary Code Table
DAC Latch Contents
Analog Output
MSB
LSB
(DAC A or DAC B)
1 1 1 1 1 1 1 1
–V
IN
255
256
1 0 0 0 0 0 0 1
–V
IN
129
256
1 0 0 0 0 0 0 0
–V
IN
128
256
=
V
IN
2
0 1 1 1 1 1 1 1
–V
IN
127
256
0 0 0 0 0 0 0 1
–V
IN
1
256
0 0 0 0 0 0 0 0
–V
IN
0
256
= 0
Note: 1 LSB = 2
8
() V
IN
() = 1
256
V
IN
()
Table II. Bipolar (Offset Binary) Code Table
DAC Latch Contents Analog Output
MSB
LSB
(DAC A or DAC B)
1 1 1 1 1 1 1 1
+V
IN
127
128
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0
0
0 1 1 1 1 1 1 1
–V
IN
1
128
0 0 0 0 0 0 0 1
–V
IN
127
128
0 0 0 0 0 0 0 0
–V
IN
128
Note: 1 LSB = 2
7
() V
IN
() = 1
128
V
IN
()
Table III. Recommended Trim Resistor
Values vs. Grade
Trim
Resistor
J/A/S
K/B/T
L/C/U
R1; R3
1 k
500
200
R2; R4
330
150
82
VIN A
(± 10V)
AD7528
VIN B
(± 10V)
RFB B
AGND
VDD
DB0
DB7
DATA
INPUTS
DAC A/
DAC B
CS
WR
DGND
CONTROL
LOGIC
INPUT
BUFFER
OUT B
LATCH
R41
DAC B
C22
R31
DAC A
LATCH
VOUT B
AGND
RFB A
OUT A
R21
C12
VOUT A
AGND
R11
NOTES:
1R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
SEE TABLE III FOR RECOMMENDED VALUES.
2C1, C2 PHASE COMPENSATION (10pF–15pF) IS REQUIRED WHEN
USING HIGH SPEED AMPLIFIERS TO PREVENT RINGING OR OSCILLATION.
Figure 4. Dual DAC Unipolar Binary Operation
(2 Quadrant Multiplication); See Table I
VIN A
(± 10V)
AD7528
VIN B
(± 10V)
RFB B
AGND
VDD
DB0
DB7
DATA
INPUTS
DAC A/
DAC B
CS
WR
DGND
CONTROL
LOGIC
INPUT
BUFFER
OUT B
LATCH
R41
DAC B
C23
R31
DAC A
LATCH
VOUT B
AGND
RFB A
OUT A
R21
C13
VOUT A
AGND
R11
A1
R72
10k
R62
20k
A2
R5
20k
R11
5k
AGND
R102
20k
R92
10k
A4
R8
20k
R12
5k
AGND
A3
NOTES:
1R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
SEE TABLE III FOR RECOMMENDED VALUES.
ADJUST R1 FOR VOUT A = 0V WITH CODE 10000000 IN DAC A LATCH.
ADJUST R3 FOR VOUT B = 0V WITH CODE 10000000 IN DAC B LATCH.
2MATCHING AND TRACKING IS ESSENTIAL FOR RESISTOR PAIRS
R6, R7 AND R9, R10.
3C1, C2 PHASE COMPENSATION (10pF–15pF) MAY BE REQUIRED
IF A1/A3 IS A HIGH SPEED AMPLIFIER.
Figure 5. Dual DAC Bipolar Operation
(4 Quadrant Multiplication); See Table II
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