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| 型號： | AD5755ACPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 38/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 16BIT QUAD 64-LFCSP |
| 視頻文件： | AD5755: 16-Bit Multi-Channel, Voltage and Current Output DAC |
| 特色產(chǎn)品： | AD5755 / AD5755-1 / AD5757 DACs |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 設(shè)置時間： | 11µs |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸出數(shù)目和類型： | 4 電流，4 電壓 |
| 采樣率（每秒）： | * |
| 其它名稱： | AD5755ACPZ-REEL7DKR |
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Data Sheet
AD5755
Rev. C | Page 43 of 52
Table 33. Recommended DC-to-DC Components
Symbol
Component
Value
Manufacturer
LDCDC
XAL4040-103
10 H
Coilcraft
CDCDC
GRM32ER71H475KA88L
4.7 F
Murata
DDCDC
PMEG3010BEA
0.38 VF
NXP
It is recommended to place a 10 , 100 nF low-pass RC filter
after CDCDC. This consumes a small amount of power but
reduces the amount of ripple on the VBOOST_x supply.
DC-to-DC Converter Operation
The on-board dc-to-dc converters use a constant frequency,
peak current mode control scheme to step up an AVCC input of
4.5 V to 5.5 V to drive the AD5755 output channel. These are
designed to operate in discontinuous conduction mode (DCM)
with a duty cycle of <90% typical. Discontinuous conduction
mode refers to a mode of operation where the inductor current
goes to zero for an appreciable percentage of the switching
cycle. The dc-to-dc converters are nonsynchronous; that is, they
require an external Schottky diode.
DC-to-DC Converter Output Voltage
When a channel current output is enabled, the converter regulates
the VBOOST_x supply to 7.4 V (±5%) or (IOUT × RLOAD + Headroom),
whichever is greater (see Figure 52 for a plot of headroom
supplied vs. output current). In voltage output mode with the
output disabled, the converter regulates the VBOOST_x supply to
+15 V (±5%). In current output mode with the output disabled,
the converter regulates the VBOOST_x supply to 7.4 V (±5%).
Within a channel, the VOUT_x and IOUT_x stages share a common
VBOOST_x supply so that the outputs of the IOUT_x and VOUT_x stages
can be tied together.
DC-to-DC Converter Settling Time
When in current output mode, the settling time for a step greater
than ~1V (IOUT × RLOAD) is dominated by the settling time of the
dc-to-dc converter. The exception to this is when the required
voltage at the IOUT_x pin plus the compliance voltage is below
7.4 V (±5%). A typical plot of the output settling time can be
found in Figure 48. This plot is for a 1 k load. The settling time
for smaller loads is faster. The settling time for current steps less
than 24 mA is also faster.
DC-to-DC Converter VMAX Functionality
The maximum VBOOST_x voltage is set in the dc-to-dc control
register (23 V, 24.5 V, 27 V, or 29.5 V; see Table 25). On reaching
this maximum voltage, the dc-to-dc converter is disabled, and
the VBOOST_x voltage is allowed to decay by ~0.4 V. After the
VBOOST_x voltage has decayed by ~0.4 V, the dc-to-dc converter
is reenabled, and the voltage ramps up again to VMAX, if still
required. This operation is shown in Figure 79.
28.6
28.7
28.8
28.9
29.0
29.1
29.2
29.3
29.4
29.5
29.6
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
V
B
OOS
T
_
x
VO
L
T
A
G
E
(V)
TIME (ms)
VMAX
0mA TO 24mA RANGE, 24mA OUTPUT
OUTPUT UNLOADED
DC-DC MaxV = 29.5V
DC_DC BIT
DC-DCx BIT = 0
DC-DCx BIT = 1
f
SW = 410kHz
TA = 25°C
07304-
183
Figure 79. Operation on Reaching VMAX
As can be seen in Figure 79, the DC-DCx bit in the status register
asserts when the AD5755 is ramping to the VMAX value, but
deasserts when the voltage is decaying to VMAX ~0.4 V.
DC-to-DC Converter On-Board Switch
The AD5755 contains a 0.425 internal switch. The switch
current is monitored on a pulse by pulse basis and is limited to
0.8 A peak current.
DC-to-DC Converter Switching Frequency and Phase
The AD5755 dc-to-dc converter switching frequency can be
selected from the dc-to-dc control register. The phasing of the
channels can also be adjusted so that the dc-to-dc converter can
clock on different edges (see Table 25). For typical applications,
a 410 kHz frequency is recommended. At light loads (low output
current and small load resistor), the dc-to-dc converter enters a
pulse-skipping mode to minimize switching power dissipation.
DC-to-DC Converter Inductor Selection
For typical 4 mA to 20 mA applications, a 10 H inductor (such
as the XAL4040-103 from Coilcraft), combined with a switch-
ing frequency of 410 kHz, allows up to 24 mA to be driven into
a load resistance of up to 1 k with an AVCC supply of 4.5 V to
5.5 V. It is important to ensure that the inductor is able to handle
the peak current without saturating, especially at the maximum
ambient temperature. If the inductor enters into saturation mode,
it results in a decrease in efficiency. The inductance value also
drops during saturation and may result in the dc-to-dc converter
circuit not being able to supply the required output power.
DC-to-DC Converter External Schottky Selection
The AD5755 requires an external Schottky for correct opera-
tion. Ensure that the Schottky is rated to handle the maximum
reverse breakdown expected in operation and that the rectifier
maximum junction temperature is not exceeded. The diode
average current is approximately equal to the ILOAD current.
Diodes with larger forward voltage drops result in a decrease in
efficiency.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| AD5755BCPZ | 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:DAC QUAD 16BIT -26.4/33VIN 64LFCSP 制造商:Analog Devices 功能描述:DAC, QUAD, 16BIT, -26.4/33VIN, 64LFCSP 制造商:Analog Devices 功能描述:DAC, QUAD, 16BIT, -26.4/33VIN, 64LFCSP, Resolution (Bits):16bit, Input Channel Type:Serial, Digital IC Case Style:LFCSP, No. of Pins:64, Data Interface:Microwire, QSPI, SPI, Supply Current:8.6mA, Operating Temperature Min:-40C, , RoHS Compliant: Yes |
| AD5755BCPZ-REEL7 | 功能描述:IC DAC 16BIT QUAD 64-LFCSP RoHS:是 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 |
| AD5755BCPZX | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad Channel, 16-Bit, Serial Input, 4-20mA & Voltage Output DAC, Dynamic Power Control |
| AD5757 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad Channel, 16-Bit,Serial Input, 4 mA to 20 mA Output DAC, Dynamic Power Control |
| AD5757_11 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad Channel, 16-Bit,Serial Input, 4 mA to 20 mA Output DAC, Dynamic Power Control |
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