參數(shù)資料
型號(hào)： AD7568
廠商： Analog Devices, Inc.
英文描述： Octal 12-Bit DAC(LC2MOS八通道12位D/A轉(zhuǎn)換器)
中文描述： 八通道12位DAC（LC2MOS八通道12位的D / A轉(zhuǎn)換器）
文件頁(yè)數(shù)： 8/12頁(yè)
文件大小： 251K
代理商： AD7568
AD7568
REV. B
–8–
UNIPOLAR BINARY OPE RAT ION
(2-Quadrant Multiplication)
Figure 15 shows the standard unipolar binary connection dia-
gram for one of the DACs in the AD7568. When V
IN
is an ac
signal, the circuit performs 2-quadrant multiplication. Resistors
R1 and R2 allow the user to adjust the DAC gain error. Offset
can be removed by adjusting the output amplifier offset voltage.
A1 should be chosen to suit the application. For example, the
AD OP07 or OP177 are ideal for very low bandwidth applica-
tions while the AD843 and AD845 offer very fast settling time
in wide bandwidth applications. Appropriate multiple versions
of these amplifiers can be used with the AD7568 to reduce
board space requirements.
T he code table for Figure 15 is shown in T able III.
DAC A
A1
I A
I A
AD7568
V
OUT
R A
V A
V
IN
NOTES
1. ONLY ONE DAC IS SHOWN FOR CLARITY.
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C1 PHASE COMPENSATION (5–15pF) MAY BE
REQUIRED WHEN USING HIGH SPEED AMPLIFIER, A1.
R2 10
R1 20
SIGNAL
GND
A1: OP-177
ADOP-07
AD711
AD843
AD845
C1
Figure 15. Unipolar Binary Operation
T able III. Unipolar Binary Code T able
Digital Input
MSB… … … LSB
Analog Output
(V
OUT
As Shown in Figure 15)
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
–V
REF
(4095/4096)
–V
REF
(2049/4096)
–V
REF
(2048/4096)
–V
REF
(2047/4096)
–V
REF
(1/4096)
–V
REF
(0/4096) = 0
NOT E
Nominal LSB size for the circuit of Figure 15 is given by:
V
REF
(1/4096).
BIPOLAR OPE RAT ION
(4-Quadrant Multiplication)
Figure 16 shows the standard connection diagram for bipolar
operation of any one of the DACs in the AD7568. T he coding is
offset binary as shown in T able IV. When V
IN
is an ac signal,
the circuit performs 4-quadrant multiplication. T o maintain the
gain error specifications, resistors R3, R4 and R5 should be ra-
tio matched to 0.01%.
DAC A
A1
I A
I A
AD7568
V
OUT
R A
V A
V
IN
NOTES
1. ONLY ONE DAC IS SHOWN FOR CLARITY.
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C1 PHASE COMPENSATION (5–15pF) MAY BE
REQUIRED WHEN USING HIGH SPEED AMPLIFIER, A1.
R2 10
R1 20
SIGNAL
GND
C1
A2
R3
10k
R5
20k
20k
R4
Figure 16. Bipolar Operation (4-Quadrant Multiplication)
T able IV. Bipolar (Offset Binary) Code T able
Digital Input
MSB . . . . . LSB
Analog Output
(V
OUT
As Shown in Figure 16)
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
+V
REF
(2047/2048)
+V
REF
(1/2048)
+V
REF
(0/2048) = 0
–V
REF
(1/2048)
–V
REF
(2047/2048)
–V
REF
(2048/2048) = –V
REF
NOT E
Nominal LSB size for the circuit of Figure 16 is given by:
V
REF
(1/2048).
SINGLE SUPPLY CIRCUIT S
T he AD7568 operates from a single +5 V supply, and this
makes it ideal for single supply systems. When operating in such
a system, it is not possible to use the standard circuits of Figures
15 and 16 since these invert the analog input, V
IN
. T here are
two alternatives. One of these continues to operate the DAC as
a current-mode device, while the other uses the voltage switch-
ing mode.
DAC A
A1
I A
I A
AD7568
V
BIAS
V
OUT
R A
V A
V
IN
NOTES
1. ONLY ONE DAC IS SHOWN FOR CLARITY.
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C1 PHASE COMPENSATION (5–15pF) MAY BE
REQUIRED WHEN USING HIGH SPEED AMPLIFIER, A1.
Figure 17. Single Supply Current-Mode Operation
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