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| 型號： | AD5405YCP-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Dual 12-Bit, High Bandwidth, Multiplying DAC with 4-Quadrant Resistors and Parallel Interface |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.015 us SETTLING TIME, 12-BIT DAC, QCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 925K |
| 代理商： | AD5405YCP-REEL7 |
AD5405
GENERAL DESCRIPTION
DAC SECTION
The AD5405 is a 12-bit, dual-channel, current-output DAC
consisting of a standard inverting R-2R ladder configuration.
Figure 31 shows a simplified diagram for a single channel of the
AD5405. The feedback resistor R
FB
has a value of 2R. The value
of R is typically 10 k (minimum 8 k and maximum 12 k).
If I
OUT
1A and I
OUT
2A are kept at the same potential, a constant
current flows in each ladder leg, regardless of digital input code.
Thus, the input resistance presented at V
REF
is always constant.
Rev. 0 | Page 14 of 24
V
REFA
I
OUT2A
DAC DATA LATCHES
AND DRIVERS
2R
S1
2R
S2
2R
S3
2R
S12
2R
R
R
R
I
OUT1A
R
FB
A
2R
0
Figure 31. Simplified Ladder Configuration
Access is provided to the V
REF
, R
FB
, I
OUT
1, and I
OUT
2 terminals of
each DAC, making the device extremely versatile and allowing
it to be configured in several different operating modes, such as
for unipolar output, bipolar output, or single-supply mode.
CIRCUIT OPERATION
Unipolar Mode
Using a single op amp, this DAC can easily be configured to
provide 2-quadrant multiplying operation or a unipolar output
voltage swing, as shown in Figure 32.
R
FB
2R
R1
2R
AD5405
12-Bit DAC A
R
R1A
R
FB
A
V
DD
V
REF
A
V
OUT
= 0V TO –V
IN
A1
I
OUT
2A
I
OUT
1A
AGND
C1
GND
AGND
R2A
R2_3A
R3A
R2
2R
R3
2R
AGND
0
NOTES
1. SIMILAR CONFIGURATION FOR DAC B
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 32. Unipolar Operation
When an output amplifier is connected in unipolar mode, the
output voltage is given by
REF
n
OUT
V
D
V
×
=
2
where D is the fractional representation of the digital word
loaded to the DAC, and n is the resolution of the DAC.
4095
0
to
D
=
With a fixed 10 V reference, the circuit shown in Figure 32 gives
a unipolar 0 V to 10 V output voltage swing. When V
IN
is an ac
signal, the circuit performs 2-quadrant multiplication.
Table 5 shows the relationship between digital code and
expected output voltage for unipolar operation.
Table 5. Unipolar Code Table
Digital Input
Analog Output (V)
1111 1111
V
REF
(4095/4096)
1000 0000
V
REF
(2048/4096) = V
REF
/2
0000 0001
V
REF
(1/4096)
0000 0000
V
REF
(0/4096) = 0
Bipolar Operation
In some applications, it may be necessary to generate full
4-quadrant multiplying operation or a bipolar output swing.
This can be easily accomplished by using another external
amplifier, as shown in Figure 33.
R
FB
2R
R1
2R
AD5405
12-Bit DAC A
R
R1A
R
FB
A
V
DD
V
REF
A
R2A
R2_3A
R3A
A1
I
OUT
2A
I
OUT
1A
AGND
C1
R2
2R
R3
2R
AGND
GND
AGND
A1
V
IN
V
OUT
= –V
IN
TO +V
IN
0
NOTES
1. SIMILAR CONFIGURATION FOR DAC B
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 33. Bipolar Operation (4-Quadrant Multiplication)
When in bipolar mode, the output voltage is given by
REF
n
REF
OUT
V
V
D
V
×
×
=
1
2
where D is the fractional representation of the digital word
loaded to the DAC, in the range of 0 to 4095, and n is the
number of bits. When V
IN
is an ac signal, the circuit performs
4-quadrant multiplication.
Table 6 shows the relationship between the digital code and the
expected output voltage for bipolar operation.
Table 6. Bipolar Code Table
Digital Input
Analog Output (V)
1111 1111
+V
REF
(2047/2048)
1000 0000
0
0000 0001
V
REF
(2047/2048)
0000 0000
V
REF
(2048/2048)
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