參數(shù)資料
型號(hào)： AD5547
廠商： Analog Devices, Inc.
英文描述： Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
中文描述： 雙路電流輸出，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)： 12/20頁(yè)
文件大小： 481K
代理商： AD5547
AD5547/AD5557
CIRCUIT OPERATION
D/A CONVERTER SECTION
The AD5547/AD5557 are 16-/14-bit, multiplying, current
output, 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 –18 V
to +18 V references. 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 12 of 20
The AD5547/AD5557 consist of two groups of precision R-2R
ladders, which make up the 12/10 LSBs, respectively. Further-
more, the 4 MSBs are decoded into 15 segments of resistor value
2R. Figure 19 shows the architecture of the 16-bit AD5547. Each
of the 16 segments and 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 VREF 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 impedance of I
OUT
, the DAC output, is code
dependent. External amplifier choice should take into account
the variation of the AD5547/AD5557 output impedance. The
feedback resistance in parallel with the DAC ladder resistance
dominates output voltage noise. To maintain good analog
performance, it is recommended that the power supply is
bypassed with a 0.01 μF to 0.1 μF ceramic or chip capacitor in
parallel with a 1 μF tantalum 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’s 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 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
V
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
15
8
4
LDAC
WR
D15
D14
D0
RS
10k
10k
ROFS
RFB
IOUT
AGND
RA
RB
Figure 19. 16-Bit AD5547 Equivalent R-2R DAC Circuit with Digital Section, One Channel Shown
相關(guān)PDF資料
PDF描述
AD5547BRU Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5547BRU-REEL7 Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5557 Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5557CRU Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5557CRU-REEL7 Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
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參數(shù)描述
AD5547BRU 功能描述:IC DAC 16BIT DUAL 38-TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時(shí)間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-LCC（J 形引線(xiàn)） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類(lèi)型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
AD5547BRU-REEL7 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
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