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參數(shù)資料
| 型號： | AD5421CREZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 16BIT SPI/SRL 28TSSOP |
| 標準包裝： | 1,000 |
| 設置時間： | 50µs |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 625mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.173"，4.40mm 寬）裸露焊盤 |
| 供應商設備封裝： | 28-TSSOP 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 1 電壓，單極 |
| 采樣率（每秒）： | * |
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Data Sheet
AD5421
Rev. G | Page 13 of 36
Pin No.
Mnemonic
Description
TSSOP
LFCSP
13, 14
4, 11, 12
COM
Ground Reference Pin for the AD5421. It is recommended that a 4.7 V Zener diode be placed
between the LOOP and COM pins. See the Applications Information section for more
information.
15, 16,
17
13, 14, 15
REG_SEL2,
REG_SEL1,
REG_SEL0
section).
18
17
REFIN
Reference Voltage Input. VREFIN = 2.5 V for specified performance.
19
18
REFOUT2
Internal Reference Voltage Output (1.22 V). It is recommended to connect a 100 nF capacitor
from this pin to COM.
20
19
REFOUT1
Internal Reference Voltage Output (2.5 V). It is recommended to connect a 100 nF capacitor from
this pin to COM.
21
20
CIN
External Capacitor Connection and HART FSK Input. An external capacitor connected from CIN to
COM implements an output slew rate control function (see the Loop Current Slew Rate Control
section). HART FSK signaling can also be coupled through a capacitor to this pin (see the HART
Communications section).
22, 23
21, 22
REXT1, REXT2
Connection for External Current Setting Resistor. A precision 24 k resistor can be connected
between these pins for improved performance.
24
23
LOOP
Loop Current Return Pin. As shown in Figure 1, the COM and LOOP pins can be used to sense
the loop current across the internal 52 resistor. Note that the voltage measured at LOOP will
be negative with respect to COM.
25
23
VLOOP
Voltage Input Pin. Voltage input range is 0 V to 2.5 V. The voltage applied to this pin is digitized to
eight bits, which are available in the fault register. This pin can be used for general-purpose
voltage monitoring, but it is intended for monitoring of the loop supply voltage. Connecting the
loop voltage to this pin via a 20:1 resistor divider allows the AD5421 to monitor and feedback
the loop voltage. The AD5421 also generates an alert if the loop voltage is close to the minimum
operating value (see the Loop Voltage Fault section).
26
DRIVE
Gate Connection for External Depletion Mode MOSFET. For more information, see the
27
REGIN
Voltage Regulator Input. The loop voltage can be connected directly to this pin. Or, to reduce on-
chip power dissipation, an external pass transistor can be connected at this pin to stand off the
loop voltage. For more information, see the Connection to Loop Power Supply section.
28
REGOUT
Voltage Regulator Output. Pin selectable values are from 1.8 V to 12 V via the REG_SEL0,
REG_SEL1, and REG_SEL2 pins (see the Voltage Regulator section). If REGOUT is driving a
microconverter supply (see Figure 50), this pin should be decoupled to COM with a >1 μF
capacitor.
N/A1
9, 16, 25
NC
No Connect. Do not connect to this pin.
EPAD
Exposed Pad
The exposed paddle should be connected to the same potential as the COM pin and to a copper
plane for optimum thermal performance.
1
N/A means not applicable.
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