- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375233 > AD5557CRU (ANALOG DEVICES INC) Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors PDF資料下載
參數(shù)資料
| 型號： | AD5557CRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.5 us SETTLING TIME, 14-BIT DAC, PDSO38 |
| 封裝： | MO-153BD-1, TSSOP-38 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 481K |
| 代理商： | AD5557CRU |
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 |
|---|---|
| AD5557CRU-REEL7 | Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors |
| AD557 | DACPORT, Low-Cost Complete μP-Compatible 8-Bit DAC(完備的電壓輸出8位D/A轉(zhuǎn)換器) |
| AD5582YRU-REEL7 | QUAD, Parallel-Input, Voltage Output, 12-/10-Bit Digital-to-Analog Converter |
| AD5583 | QUAD, Parallel-Input, Voltage Output, 12-/10-Bit Digital-to-Analog Converter |
| AD5583YRU-REEL7 | QUAD, Parallel-Input, Voltage Output, 12-/10-Bit Digital-to-Analog Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5557CRU-REEL7 | 功能描述:IC DAC 14BIT 2CH I OUT 38TSSOP RoHS:否 類別: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 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD5557CRUZ | 功能描述:IC DAC 14BIT 2CH I OUT 38TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD5560 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.2 A Programmable Device Power Supply with Integrated 16-Bit Level Setting DACs |
| AD5560JBCZ | 功能描述:PMIC 解決方案 1.2A programmable DPS with DACs RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| AD5560JBCZ-REEL | 功能描述:PMIC 解決方案 1.2A programmable DPS with DACs RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。