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器件3D模型￥ 301.386
DAC1282IPWR 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DA转换器
封装:
TSSOP-24
描述:
低失真数位类比转换器用于地震 LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3P22Hot
典型应用电路图在P37P38
原理图在P14P15
封装尺寸在P40P42P43
标记信息在P40
封装信息在P39P40P41P42P43
功能描述在P3
技术参数、封装参数在P4P26
应用领域在P1P37P38P46
电气规格在P5P6P7P14P26
型号编号列表在P26
导航目录
DAC1282IPWR数据手册
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SWOUTP
SWOUTN
SWINP
SWINN
S
5
S
2
S
1
S
4
S
3
DAC1282, DAC1282A
SBAS490B –DECEMBER 2011–REVISED MAY 2015
www.ti.com
8.2.5 Output Switch (SWINP, SWINN, SWOUTP, SWOUTN)
The DAC1282 has an integrated output switch. The switch can be used to route the DAC output signal to a
sensor for pulse, THD, and common-mode testing. The switch has low on-resistance and matched elements to
minimize signal distortion. The switch input voltage range extends to the analog power supply.
The switch is controlled by three register bits, SW[2:0], and is also controlled by the SW/TD input pin. The switch
integrates break-before-make operation when the register or the SW/TD input control is changed. The SW/TD
input can be used to force the switch open for precise timing control of sensor impulse testing; see the Switch
Control/DAC Data Input (SW/TD) section. Figure 37 and Table 8 describe the switch operation.
Figure 37. DAC1282 Signal Switch
Note that when the DAC is in power-down mode, the switch is forced open.
As shown in Figure 29, the switch on-resistance varies with the switch signal level. When the switch is used to
route the signal and a resistive load is connected to the switch output, the switch on-resistance variations interact
with the load resistance and cause the THD to degrade. Figure 27 illustrates the dependence of THD versus
switch load resistance. The dependence of THD data was taken with a full-scale signal.
Table 8. Switch Connections
DESCRIPTION PIN CONNECTIONS SWITCHES CLOSED SW[2:0] REGISTER BITS
Open (default) Open None 000
Differential SWINP to SWOUTP and SWINN to SWOUTN S1, S3 001
Differential reverse SWINP to SWOUTN and SWINN to SWOUTP S2, S4 010
Common-mode positive SWINP to SWOUTP and SWOUTN S1, S2 011
Common-mode negative SWINN to SWOUTP and SWOUTN S3, S4 100
Single-ended positive SWINP to SWOUTP S1 101
Single-ended negative SWINN to SWOUTN S3 110
Output short SWOUTP to SWOUTN S5 111
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