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| 型號： | AD5380BST-5 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 32-Channel, 3 V/5 V, Single-Supply, 14-Bit, Voltage Output DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 8 us SETTLING TIME, 14-BIT DAC, PQFP100 |
| 封裝： | 14 X 14 MM, MS-026BED, LQFP-100 |
| 文件頁數(shù)： | 19/34頁 |
| 文件大小： | 975K |
| 代理商： | AD5380BST-5 |
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PRELIMINARY TECHNICAL DATA
REV. PrF 09/2003
AD5380
–19–
Control Register Write/Read
REG1=REG0=0, A5-A0=001100, R/
W
status determines if the operation is a write (R/
W
=0) or a read (R/
W
=1).
DB13-DB0 contains the control register data.
AD5380 Control Register Contents
MSB
CR13
CR12
CR11
CR10
CR9
CR8
LSB
CR0
CR7
CR6 CR5 CR4 CR3 CR2 CR1
Table VI: AD5380 Control Register Contents
CR13: Power Down Status. This bit is used to configure the output amplifier state in power down.
CR13=1 amplifier output is high impedance .
CR13=0 amplifier output is 100k to ground (default on power up).
CR12: REF Select. This bit selects the operating internal reference for the AD5380. CR12 is programmed as follows:
CR12=1: Internal reference is 2.5V (AD5380-5 default). Recommended operating reference for
AD5380-5.
CR12=0: Internal reference is 1.25V (AD5380-3 default). Recommended operating reference for AD5380-3.
CR11: Current Boost Control. This bit is used to boost the current in the output amplifier therby altering its slew rate.
This bit is configured as follows:
CR11=1: Boost mode on. This maximizes the bias current in the output amplifier optimizing its slew rate
but increasing the power dissipation.
CR11=0: Boost mode off (default on power up). This reduces the bias current in the output amplifier and
reduces the overall power consumption.
CR10: Internal/External Reference. This bits determines if the DAC uses its internal reference or an externally applied
reference.
CR10=1: Internal Reference enabled. Reference output depends on data loaded to CR12.
CR10=0: External Reference selected (default on power up)
CR9: Channel Monitor Enable (see channel monitor function )
CR9=1: Monitor Enabled. This enables the channel monitor function. Following a write to the monitor
channel in the SFR register the selected channel output is routed to the MON_OUT pin. VOUT 39 operates
as the MON-OUT pin on the AD5380.
CR9=0: Monitor Disabled (default on power-up). When monitor is disabled the MON_OUT pin assumes its
normal DAC output function on the AD5380.
CR8: Thermal Monitor Function. This function is used to monitor the internal die temperature of the AD5380 when
enabled. The thermal monitor powers down the output amplifiers when the temperature exceeds 130 degree C. This
function can be used to protect the device in cases where the power dissipation of the device may be exceeded if a number
of output channels are simultaneously short circuited. A soft power-up will re-enable the output amplifiers id the die
temperature has dropped below 130C.
CR8=1: Thermal monitor enabled.
CR8=0 Thermal monitor disabled (default on power-up).
CR7: Dont Care
CR6 to CR2: Toggle Function Enable. This function allows the user to toggle the output between two codes loaded to
the A and B register for each DAC. Control Register bits CR6 to CR2 are used to enable individual groups of 8-chan-
nels for operation in toggle mode. A logic 1 written to any bit enables a group of channels and a logic zero disables a
group.
LDAC
is used to toggle between the two registers. Logic 1 enables a group of channels and a logic zero disables
a group.
CR Bit
Group
CR6
4
CR5
3
CR4
2
CR3
1
CR2
0
Channels
32-39
24-31
16-23
8-15
0-7
CR1 and CR0 are dont cares.
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