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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 683K |
| 代理商： | AD5546 |
AD5546/AD5556
CIRCUIT OPERATION
D/A CONVERTER SECTION
The AD5546/AD5556 are 16-/14-bit multiplying, current out-
put, and parallel input DACs. The devices operate from a single
2.7 V to 5.5 V supply, and provide both unipolar 0 V to –V
REF
, or
0 V to +V
REF
, and bipolar ±V
REF
output ranges from a –18 V to
+18 V reference. In addition to the precision conversion R
FB
commonly found in current output DACs, there are three addi-
tional precision resistors for 4-quadrant bipolar applications.
Rev. 0 | Page 11 of 16
The AD5546/AD5556 consist of two groups of precision R-2R
ladders, which make up the 12/10 LSBs, respectively. Further-
more, the four MSBs are decoded into 15 segments of resistor
value 2R. Figure 19 shows the architecture of the 16-bit
AD5546. Each of the 16 segments in the R-2R ladder carries an
equally weighted current of one-sixteenth of full scale. The
feedback resistor, R
FB
, and 4-quadrant resistor, R
OFS
, have values
of 10 k. Each 4-quadrant resistor, R1 and R2, equals 5 k. In
4-quadrant operation, R1, R2, and an external op amp work
together to invert the reference voltage and apply it to the REF
input. With R
OFS
and R
FB
connected as shown in Figure 2, the
output can swing from –V
REF
to +V
REF
.
The reference voltage inputs exhibit a constant input resistance
of 5 k ±20%. The DAC output, I
OUT
, impedance is code depen-
dent. External amplifier choice should take into account the
variation of the AD5546/AD5556 output impedance. The
feedback resistance in parallel with the DAC ladder resistance
dominates output voltage noise. To maintain good analog
performance, it is recommended to bypass the power supply
with a 0.01 μF to 0.1 μF ceramic or chip capacitor in parallel
with a 1 μF tantulum capacitor. Also, to minimize gain error,
PCB metal traces between V
REF
and R
FB
should match.
Every code change of the DAC corresponds to a step function;
gain peaking at each output step may occur if the op amp has
limited GBP and excessive parasitic capacitance present at the
op amp inverting node. A compensation capacitor, therefore,
may be needed between the I-V op amp inverting and output
nodes to smooth the step transition. Such a compensation
capacitor should be found empirically, but a 20 pF capacitor is
generally adequate for the compensation.
The V
DD
power is used primarily by the internal logic and to
drive the DAC switches. Note that the output precision degrades
if the operating voltage falls below the specified voltage. Users
should also avoid using switching regulators because device
power supply rejection degrades at higher frequencies.
0
2R
80k
R
40k
2R
80k
2R
80k
2R
80k
2R
80k
2R
80k
R
40k
2R
80k
R
2R
80k
R
2R
80k
R
2R
80k
R
2R
80k
2R
80k
R
40k
R2
5k
R1
5k
REF
2R
80k
R
40k
2R
80k
R
40k
2R
80k
R
40k
2R
80k
R
40k
2R
80k
R
40k
2R
80k
RCOM
R1
ADDRESS DECODER
DAC REGISTER
INPUT REGISTER
LDAC
WR
RS
RS
4 MSB
15 SEGMENTS
8-BIT R2R
4-BIT R2R
16
8
4
LDAC
WR
D15
D14
D0
RS
10k
10k
ROFS
RFB
IOUT
GND
RA
RB
Figure 19. 16-Bit AD5546 Equivalent R-2R DAC Circuit with Digital Section
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