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参数资料
| 型号： | AD5382BST-5-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 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 |
| 封装： | 14 X 14 MM, MS-026BED, LQFP-100 |
| 文件页数： | 23/40页 |
| 文件大小： | 616K |
| 代理商： | AD5382BST-5-REEL |
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AD5382
Table 16. Control Register Contents
MSB
CR13
CR12
Control Register Write/Read
REG1 = REG0 = 0, A4–A0 = 01100, R/W status determines if
the operation is a write (R/W = 0) or a read (R/W = 1). DB13 to
DB0 contains the control register data.
Rev. 0 | Page 23 of 40
CR11
CR10
CR9
CR8
CR7
CR6
CR5
CR4
CR3
CR2
CR1
LSB
CR0
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 (default on
power-up).
CR13 = 0. Amplifier output is 100 k to ground.
CR12:
REF Select. This bit selects the operating internal
reference for the AD5382. CR12 is programmed as follows:
CR12 = 1: Internal reference is 2.5 V (AD5382-5 default), the
recommended operating reference for AD5382-5.
CR12 = 0: Internal reference is 1.25 V (AD5382-3 default),
the recommended operating reference for AD5382-3.
CR11:
Current Boost Control. This bit is used to boost the
current in the output amplifier, thereby 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 bit determines if the
DAC uses its internal reference or an externally applied
reference.
CR10 = 1: Internal Reference Enabled. The 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. After a write to the monitor channel in the SFR
register, the selected channel output is routed to the
MON_OUT pin.
CR9 = 0: Monitor Disabled (default on power-up). When the
monitor is disabled, MON_OUT is three-stated.
CR8:
Thermal Monitor Function. This function is used to
monitor the AD5382’s internal die temperature when enabled.
The thermal monitor powers down the output amplifiers when
the temperature exceeds 130°C. This function can be used to
protect the device in cases where power dissipation may be
exceeded if a number of output channels are simultaneously
short-circuited. A soft power-up will re-enable the output
amplifiers if the die temperature has dropped below 130°C.
CR8 = 1: Thermal Monitor Enabled.
CR8 = 0: Thermal Monitor Disabled (default on power- up).
CR7 and CR6:
Don’t Care.
CR5 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 CR5 to CR2 are
used to enable individual groups of eight channels for opera-
tion in toggle mode. A Logic 1 written to any bit enables a group
of channels; a Logic 0 disables a group. LDAC is used to toggle
between the two registers. Table 17 shows the decoding for
toggle mode operation. For example, CR5 controls group 3,
which contains channels 24 to 31, CR5 = 1 enables these
channels .
CR1 and CR0:
Don’t Care.
Table 17.
CR Bit
CR5
CR4
CR3
CR2
Channel Monitor Function
REG1 = REG0 = 0, A4–A0 = 01010
Group
3
2
1
0
Channels
24–31
16–23
8–15
0–7
DB13–DB8 = Contain data to address the monitored channel.
A channel monitor function is provided on the AD5382. This
feature, which consists of a multiplexer addressed via the
interface, allows any channel output or the signals connected to
the MON_IN inputs to be routed to the MON_OUT pin for
monitoring using an external ADC. The channel monitor
function must be enabled in the control register before any
channels are routed to MON_OUT. On the AD5382, DB13 to
DB8 contain the channel address for the monitored channel.
Selecting channel address 63 three-states MON_OUT.
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