參數資料
| 型號： | AD5344BRU |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT QUAD VOUT 28-TSSOP |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 50 |
| 設置時間： | 8µs |
| 位數： | 12 |
| 數據接口： | 并聯 |
| 轉換器數目： | 4 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 4.5mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 28-TSSOP |
| 包裝： | 管件 |
| 輸出數目和類型： | 4 電壓，單極；4 電壓，雙極 |
| 采樣率（每秒）： | 125k |
REV. 0
AD5334/AD5335/AD5336/AD5344
–15–
DB8
DB9
X
HIGH BYTE
LOW BYTE
X = UNUSED BIT
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
XX
Figure 30. Data Format For AD5335
POWER-ON RESET
The AD5334/AD5335/AD5336/AD5344 are provided with a
power-on reset function, so that they power up in a dened state.
The power-on state is:
Normal operation
0 – VREF output range
Output voltage set to 0 V
Both input and DAC registers are lled with zeros and remain
so until a valid write sequence is made to the device. This is
particularly useful in applications where it is important to know
the state of the DAC outputs while the device is powering up.
POWER-DOWN MODE
The AD5334/AD5335/AD5336/AD5344 have low power con-
sumption, dissipating typically 1.5 mW with a 3 V supply and
3 mW with a 5 V supply. Power consumption can be further
reduced when the DACs are not in use by putting them into
power-down mode, which is selected by taking pin
PD low.
When the
PD pin is high, the DACs work normally with a typical
power consumption of 600
A at 5 V (500 A at 3 V). In power-
down mode, however, the supply current falls to 200 nA at 5 V
(80 nA at 3 V) when the DACs are powered down. Not only
does the supply current drop, but the output stage is also internally
switched from the output of the amplier, making it open-circuit.
This has the advantage that the outputs are three-state while
the part is in power-down mode, and provides a dened input
condition for whatever is connected to the outputs of the
DAC ampliers. The output stage is illustrated in Figure 31.
RESISTOR
STRING DAC
POWER-DOWN
CIRCUITRY
AMPLIFIER
VOUT
Figure 31. Output Stage During Power-Down
The bias generator, the output amplier, the resistor string, and
all other associated linear circuitry are all shut down when the
power-down mode is activated. However, the contents of the
registers are unaffected when in power-down. The time to exit
power-down is typically 2.5
s for VDD = 5 V and 5 s when
VDD = 3 V. This is the time from a rising edge on the PD pin
to when the output voltage deviates from its power-down volt-
age. See Figure 22.
Table I. AD5334/AD5336/AD5344 Truth Table
CLR
LDAC
CS
WR
A1
A0
Function
1
X
No Data Transfer
1
X
1
X
No Data Transfer
0
X
Clear All Registers
11
0
1
0
Load DAC A Input Register, GAIN A (AD5334/AD5336)
11
0
1
0
1
Load DAC B Input Register, GAIN B (AD5334/AD5336)
11
0
1
0
Load DAC C Input Register, GAIN C (AD5334/AD5336)
11
0
1
Load DAC D Input Register, GAIN D (AD5334/AD5336)
1
0
X
Update DAC Registers
X = don’t care.
Table II. AD5335 Truth Table
CLR
LDAC
CS
WR
A1
A0
HBEN
Function
1
X
No Data Transfer
1
X
1
X
No Data Transfer
0
X
Clear All Registers
11
0
1
0
Load DAC A Low Byte Input Register
11
0
1
0
1
Load DAC A High Byte Input Register
11
0
1
0
1
0
Load DAC B Low Byte Input Register
11
0
1
0
1
Load DAC B High Byte Input Register
11
0
1
0
Load DAC C Low Byte Input Register
11
0
1
0
1
Load DAC C High Byte Input Register
11
0
1
0
Load DAC D Low Byte Input Register
11
0
1
Load DAC D High Byte Input Register
1
0
X
Update DAC Registers
X = don’t care.
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