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參數(shù)資料
| 型號： | EVAL-AD5780SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD5780 |
| 設(shè)計資源： | CN-0200 Circuit |
| 標準包裝： | 1 |
| DAC 的數(shù)量： | 1 |
| 位數(shù)： | 18 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，和 SPI? |
| 設(shè)置時間： | 2.5µs |
| DAC 型： | 電壓 |
| 工作溫度： | -40°C ~ 125°C |
| 已供物品： | 板，纜線，CD |
| 已用 IC / 零件： | AD5780 |
| 相關(guān)產(chǎn)品： | AD5780ACPZ-ND - IC DAC VOLT OUT 18BIT 24LFCSP |
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AD5780
Data Sheet
Rev. E | Page 8 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
2
1
3
4
5
6
7
18
19
17
16
15
14
13
LDAC
CLR
VDD
RESET
VDD
VREFP
VOUT
SCLK
SYNC
DGND
VREFN
VSS
AGND
NOTES
1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
2. NEGATIVE ANALOG SUPPLY CONNECTION (VSS).
A VOLTAGE IN THE RANGE OF –16.5 V TO –2.5 V
CAN BE CONNECTED. VSS SHOULD BE DECOUPLED
TO AGND. THE PADDLE CAN BE LEFT ELECTRICALLY
UNCONNECTED PROVIDED THAT A SUPPLY
CONNECTION IS MADE AT THE VSS PINS. IT IS
RECOMMENDED THAT THE PADDLE BE THERMALLY
CONNECTED TO A COPPER PLANE FOR ENHANCED
THERMAL PERFORMANCE.
9
1
0
1
2
8
IO
V
C
D
N
C
S
D
O
S
D
IN
V
C
AD5780
TOP VIEW
(Not to Scale)
2
1
2
0
2
D
N
C
R
F
B
D
N
C
2
3
D
N
C
2
4
IN
V
0
964
9-
00
5
Figure 4. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VOUT
Analog Output Voltage.
2
VREFP
Positive Reference Voltage Input. A voltage in the range of 5 V to VDD 2.5 V can be connected to this pin.
3, 5
VDD
Positive Analog Supply Connection. A voltage in the range of 7.5 V to 16.5 V can be connected to this pin. VDD must
be decoupled to AGND.
4
RESET
Active Low Reset. Asserting this pin returns the AD5780 to its power-on status.
6
CLR
Active Low Input. Asserting this pin sets the DAC register to a user defined value (see Table 12) and updates the DAC
output. The output value depends on the DAC register coding that is being used, either binary or twos complement.
7
LDAC
Active Low Load DAC Logic Input. This pin 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. Do not leave
the LDAC pin unconnected.
8
VCC
Digital Supply. Voltage range is from 2.7 V to 5.5 V. VCC should be decoupled to DGND.
9
IOVCC
Digital Interface Supply. Digital threshold levels are referenced to the voltage applied to this pin. Voltage range is
from 1.71 V to 5.5 V.
10, 21,
22, 23
DNC
Do Not Connect. Do not connect to these pins.
11
SDO
Serial Data Output. Data is clocked out on the rising edge of the serial clock input.
12
SDIN
Serial Data Input. This device has a 24-bit input 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 rates of up to 35 MHz.
14
SYNC
Level Triggered Control Input (Active Low). This is the frame synchronization signal for the input data. When SYNC
goes low, it enables the input shift register, and data is then transferred in on the falling edges of the following
clocks. The DAC is updated on the rising edge of SYNC.
15
DGND
Ground Reference Pin for Digital Circuitry.
16
VREFN
Negative Reference Voltage Input.
17, 18
VSS
Negative Analog Supply Connection. A voltage in the range of 16.5 V to 2.5 V can be connected to this pin.
VSS must be decoupled to AGND.
19
AGND
Ground Reference Pin for Analog Circuitry.
20
RFB
Feedback Connection for External Amplifier. See the AD5780 Features section for further details.
24
INV
Inverting Input Connection for External Amplifier. See the AD5780 Features section for further details.
EPAD
VSS
Negative Analog Supply Connection (VSS). A voltage in the range of 16.5 V to 2.5 V can be connected to this pin.
VSS must be decoupled to AGND. The paddle can be left electrically unconnected provided that a supply connection is
made at the VSS pins. It is recommended that the paddle be thermally connected to a copper plane for enhanced
thermal performance.
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