參數資料
| 型號： | AD5791BRUZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 29/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 20BIT SRL 20TSSOP |
| 產品變化通告： | AD57x1 Feature Change 27/Jul/2011 |
| 標準包裝： | 1 |
| 設置時間： | 1µs |
| 位數： | 20 |
| 數據接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數目： | 1 |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 20-TSSOP |
| 包裝： | 管件 |
| 輸出數目和類型： | * |
| 采樣率（每秒）： | * |
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AD5791
Data Sheet
Rev. D | Page 8 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
9
10
VOUT
VREFPS
VREFPF
CLR
RESET
VDD
INV
IOVCC
VCC
LDAC
20
19
18
17
16
15
14
13
12
11
AGND
VSS
VREFNS
SYNC
DGND
VREFNF
SDO
SDIN
SCLK
RFB
AD5791
TOP VIEW
(Not to Scale)
08964-
005
Figure 4. Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
INV
Connection to Inverting Input of External Amplifier. See the AD5791 Features section for further details.
2
VOUT
Analog Output Voltage.
3
VREFPS
Positive Reference Sense Voltage Input. A voltage range of 5 V to VDD 2.5 V can be connected. A unity gain
amplifier must be connected at this pin in conjunction with the VREFPF pin. See the AD5791 Features section for
further details.
4
VREFPF
Positive Reference Force Voltage Input. A voltage range of 5 V to VDD 2.5 V can be connected. A unity gain
amplifier must be connected at this pin in conjunction with the VREFPS pin. See the AD5791 Features section for
further details.
5
VDD
Positive Analog Supply Connection. A voltage range of 7.5 V to 16.5 V can be connected, VDD should be decoupled
to AGND.
6
RESET
Active Low Reset Logic Input Pin. Asserting this pin returns the AD5791 to its power-on status.
7
CLR
Active Low Clear Logic Input Pin. Asserting this pin sets the DAC register to a user defined value (see Table 13) and
updates the DAC output. The output value depends on the DAC register coding that is being used, either binary
or twos complement.
8
LDAC
Active Low Load DAC Logic Input Pin. This is used to update the DAC register and consequently, the analog
output. When tied permanently low, the output is updated on the rising edge of SYNC. If LDAC is held high during
the write cycle, the input register is updated, but the output update is held off until the falling edge of LDAC. The
LDAC pin should not be left unconnected.
9
VCC
Digital Supply Connection. A voltage range of 2.7 V to 5.5 V can be connected. VCC should be decoupled to DGND.
10
IOVCC
Digital Interface Supply Pin. Digital threshold levels are referenced to the voltage applied to this pin. A voltage in
the range of 1.71 V to 5.5 V can be connected. IOVCC should not be allowed to exceed VCC.
11
SDO
Serial Data Output Pin. Data is clocked out on the rising edge of the serial clock input.
12
SDIN
Serial Data Input Pin. This device has a 24-bit shift register. Data is clocked into the register on the falling edge of
the serial clock input.
13
SCLK
Serial Clock Input. Data is clocked into the input shift register on the falling edge of the serial clock input. Data can
be transferred at clock rates of up to 35 MHz.
14
SYNC
Active Low Digital Interface Synchronization Input Pin. This is the frame synchronization signal for the input data.
When SYNC is low, it enables the input shift register, and data is then transferred in on the falling edges of the
following clocks. The input shift register is updated on the rising edge of SYNC.
15
DGND
Ground Reference Pin for Digital Circuitry.
16
VREFNF
Negative Reference Force Voltage Input. A voltage range of VSS + 2.5 V to 0 V can be connected. A unity gain
amplifier must be connected at this pin, in conjunction with the VREFNS pin. See the AD5791 Features section for
further details.
17
VREFNS
Negative Reference Sense Voltage Input. A voltage range of VSS + 2.5 V to 0 V can be connected. A unity gain
amplifier must be connected at this pin, in conjunction with the VREFNF pin. See the AD5791 Features section for
further details.
18
VSS
Negative Analog Supply Connection. A voltage range of 16.5 V to 2.5 V can be connected. VSS should be
decoupled to AGND.
19
AGND
Ground Reference Pin for Analog Circuitry.
20
RFB
Feedback Connection for External Amplifier. See the AD5791 Features section for further details.
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