參數(shù)資料
型號(hào)： AD5381BSTZ-5-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 28/40頁(yè)
文件大?。?/td> 0K
描述： IC DAC 12BIT 40CH 5V 100-LQFP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
產(chǎn)品變化通告： AD5381,3 Redesign Change 24/Oct/2011
設(shè)計(jì)資源： 40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5381 (CN0010)
AD5381 Channel Monitor Function (CN0013)
標(biāo)準(zhǔn)包裝： 1
設(shè)置時(shí)間： 6µs
位數(shù)： 12
數(shù)據(jù)接口： 串行，并聯(lián)
轉(zhuǎn)換器數(shù)目： 40
電壓電源： 單電源
功率耗散（最大）： 80mW
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-LQFP
供應(yīng)商設(shè)備封裝： 100-LQFP（14x14）
包裝： 標(biāo)準(zhǔn)包裝
輸出數(shù)目和類(lèi)型： 40 電壓，單極
采樣率（每秒）： 167k
其它名稱： AD5381BSTZ-5-REELDKR
AD5381
Data Sheet
Rev. D | Page 34 of 40
MONITOR FUNCTION
The AD5381 channel monitor function consists of a multiplexer
addressedvia the interface, allowing any channel output to be
routed to this pin for monitoring using an external ADC. In
channel monitor mode, VOUT39 becomes the MON_OUTpin,
to which all monitoredsignals are routed. The channel monitor
function must be enabled in the control register beforeany
channels are routed to MON_OUT. Table17 contains the
decoding information required to route anychannel to
MON_OUT.Selecting Channel Address 63 three-states
MON_OUT.Figure 41 shows a typical monitoring circuit
implemented using a 12-bit SAR ADC in a 6-lead SOT-23
package. The controller output port selects the channel to be
monitored, and the input port readsthe converteddata from
the ADC.
AD7476
GND
SDATA
CS
SCLK
VDD
VIN
VOUT39/MON_OUT
AGND
DIN
SYNC
SCLK
DAC_GND SIGNAL_GND
VOUT0
VOUT38
AVDD
AD5381
OUTPUT PORT
INPUT PORT
CONTROLLER
03732-041
Figure 41. Typical Channel Monitoring Circuit
TOGGLE MODE FUNCTION
The toggle mode function allows an output signal to be gener-
ated using the LDACcontrolsignalthat switches between two
DAC data registers. This function is configured using the SFR
control register as follows. A write with REG1 = REG0 = 0 and
A5 to A0 = 001100 specifies a control register write. The toggle
mode function is enabled in groups of eight channels using Bit
CR4 to Bit CR0 in the control register. See the AD5381 control
register description. Figure42 shows a blockdiagram of toggle
mode implementation. Each of the 40 DAC channels on the
AD5381 contain an A and B data register.
Note that B registers can only be loadedwhen toggle mode is
enabled. The sequence of events whenconfiguring the AD5381
for toggle mode is
1. Enable toggle mode for the required channels via the
control register.
2. Load data to the A registers.
3. Load data to the B registers.
4. Apply LDAC.
LDACis used to switch between the A and B registers in
determining the analog output. Thefirst LDACconfiguresthe
output to reflect data in the A registers. This modeofferssignif-
icant advantages if the user wants to generatea square waveat
the output of all 40 channels, as might be required to drivea
liquid crystal-based variableoptical attenuator.
In this case, the user writes to the control register and enables
the toggle function by setting CR4 to CR2 = 0, thus enabling the
five groups of eight for toggle modeoperation. The user must
then load data to all 40 A and B registers. Toggling LDACsets
the output values to reflect the data in the A and B registers.
The frequency of the LDACdetermines the frequency of the
square waveoutput.
Toggle mode is disabled via the control register. The first LDAC
following the disabling of the toggle mode will update the out-
puts with the data contained in the A registers.
THERMAL MONITOR FUNCTION
The AD5381 contains a temperature shutdown function to
protect the chip if multiple outputs areshorted. The short-
circuit current of each output amplifier is typically 40 mA.
Operating the AD5381 at 5 V leads to a power dissipation of
200 mW per shorted amplifier. Withfive channels shorted, this
leads to an extra watt of powerdissipation. Forthe 100-lead
LQFP, the θ
JA is typically 44°C/W.
The thermal monitoris enabledby the user via CR6 in the
control register. The outputamplifiers on the AD5381 are
automatically powered down if the die temperatureexceeds
approximately 130°C. After a thermal shutdown hasoccurred,
the user can re-enable the part by executing a soft power-upif
the temperature has droppedbelow130°C or by turning off the
thermal monitorfunction via the control register.
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