參數(shù)資料
型號(hào)： EVAL-AD5382EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 29/40頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD5382
產(chǎn)品培訓(xùn)模塊： DAC Architectures
標(biāo)準(zhǔn)包裝： 1
DAC 的數(shù)量： 32
位數(shù)： 14
采樣率（每秒）： 125k
數(shù)據(jù)接口： DSP，I²C，MICROWIRE?，并行，QSPI?，SPI?
設(shè)置時(shí)間： 8µs
DAC 型： 電壓
工作溫度： -40°C ~ 85°C
已供物品： 板，CD
已用 IC / 零件： AD5382
其它名稱(chēng)： Q4391457
Data Sheet
AD5382
Rev. C | Page 35 of 40
14-BIT DAC
DAC
REGISTER
INPUT
DATA
INPUT
REGISTER
DATA
REGISTER
B
DATA
REGISTER
A
A/B
VOUT
LDAC
CONTROL INPUT
03733
-0
42
Figure 41. Toggle Mode Function
ACTUATORS
FOR MEMS
MIRROR
ARRAY
SENSOR
AND
MULTIPLEXER
8-CHANNEL ADC
(AD7856)
OR
SINGLE CHANNEL
ADC (AD7671)
AD5382
14-BIT DAC
REFOUT/REFIN
AVDD
VOUT1
VOUT31
G = 50
OUTPUT RANGE
0V TO 200V
ADSP-21065L
0.01
F
03733-043
+5V
Figure 42. AD5382 in a MEMS Based Optical Switch
THERMAL MONITOR FUNCTION
The AD5382 contains a temperature shutdown function to
protect the chip if multiple outputs are shorted. The short-
circuit current of each output amplifier is typically 40 mA.
Operating the AD5382 at 5 V leads to a power dissipation of
200 mW per shorted amplifier. With five channels shorted, this
leads to an extra watt of power dissipation. For the 100-lead
LQFP, the θJA is typically 44°C/W.
The thermal monitor is enabled by the user via CR8 in the
control register. The output amplifiers on the AD5382 are
automatically powered down if the die temperature exceeds
approximately 130°C. After a thermal shutdown occurs, the
user can re-enable the part by executing a soft power-up if the
temperature drops below 130°C or by turning off the thermal
monitor function via the control register.
AD5382 IN A MEMS-BASED OPTICAL SWITCH
In their feed-forward control paths, MEMS-based optical
switches require high resolution DACs that offer high channel
density with 14-bit monotonic behavior. The 32-channel, 14-bit
AD5382 DAC satisfies these requirements. In the circuit in
Figure 42, the 0 V to 5 V outputs of the AD5382 are amplified
to achieve an output range of 0 V to 200 V, which is used to
control actuators that determine the position of MEMS mirrors
in an optical switch. The exact position of each mirror is meas-
ured using sensors. The sensor outputs are multiplexed into a
high resolution ADC in determining the mirror position. The
control loop is closed and driven by an ADSP-21065L, a 32-bit
SHARC DSP with an SPI-compatible SPORT interface. The
ADSP-21065L writes data to the DAC, controls the multiplexer,
and reads data from the ADC via the serial interface.
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