Datasheet > LTC2636HMS-LZ12#TR

LTC2636HMS-LZ12#TR

更新时间： 2024-02-10 06:52:50

品牌	Logo	应用领域
凌特 - Linear		光电二极管转换器
页数	文件大小	规格书
24页	351K
描述
D/A Converter, 12-Bit, 8 Func, CMOS, PDSO16

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技术参数
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LTC2636HMS-LZ12#TR 技术参数

是否Rohs认证：	不符合	生命周期：	Active
Reach Compliance Code：	not_compliant	风险等级：	5.62
转换器类型：	D/A CONVERTER	输入位码：	BINARY
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e0
最大线性误差 (EL)：	0.06%	位数：	12
功能数量：	8	端子数量：	16
最高工作温度：	125 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装等效代码：	TSSOP16,.19,20	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	电源：	3/5 V
认证状态：	Not Qualified	子类别：	Other Converters
最大压摆率：	1.5 mA	表面贴装：	YES
技术：	CMOS	温度等级：	AUTOMOTIVE
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	0.5 mm	端子位置：	DUAL

LTC2636HMS-LZ12#TR 数据手册

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LTC2636

OPERATION

up as its voltage output is updated. When a DAC which

is in a powered-down state is powered up and updated,

normal settling is delayed. If less than eight DACs are in

a powered-down state prior to the update command, the

power-up delay time is 10μs. However, if all eight DACs

and the integrated reference are powered down, then the

main bias generation circuit block has been automatically

shut down in addition to the DAC ampliﬁers and reference

buffers. In this case, the power up delay time is 12μs.

The power-up of the integrated reference depends on

the command that powered it down. If the reference is

powered down using the Select External Reference Com-

mand (0111b), then it can only be powered back up using

Select Internal Reference Command (0110b). However, if

the reference was powered down using Power Down Chip

Command (0101b), then in addition to Select Internal

Reference Command (0110b), any command (in software

or using the LDAC pin) that powers up the DACs will also

power up the integrated reference.

at the REF pin. Adding bypass capacitance to the REF pin

will improve noise performance; and up to 10μF can be

drivenwithoutoscillation.TheREFoutputmustbebuffered

when driving an external DC load current.

Alternatively, the DAC can operate in External Reference

modeusingcommand0111b.Inthismode,aninputvoltage

supplied externally to the REF pin provides the reference

(1V ≤ V ≤ V ) and the supply current is reduced. The

REF

external reference voltage supplied sets the full-scale DAC

output voltage. External Reference mode is the power-on

default for LTC2636-HMX/-LMX.

The reference mode of LTC2636-HZ/-LZ/-HMI/-LMI

(Internal Reference power-on default), can be changed

by software command after power-up. The same is true

for LTC2636-HMX/-LMX (External Reference power-on

default).

Power-Down Mode

Forpower-constrainedapplications,power-downmodecan

be used to reduce the supply current whenever less than

eight DAC outputs are needed. When in power-down, the

buffer ampliﬁers, bias circuits, and integrated reference

circuitsaredisabled,anddrawessentiallyzerocurrent.The

DAC outputs are put into a high-impedance state, and the

output pins are passively pulled to ground through indi-

vidual 200kΩ resistors. Input- and DAC-register contents

are not disturbed during power-down.

Voltage Outputs

The LTC2636’s integrated rail-to-rail ampliﬁers have guar-

anteed load regulation when sourcing or sinking up to

10mA at 5V, and 5mA at 3V.

Load regulation is a measure of the ampliﬁer’s ability to

maintain the rated voltage accuracy over a wide range of

load current. The measured change in output voltage per

change in forced load current is expressed in LSB/mA.

Any DAC channel or combination of channels can be put

into power-down mode by using command 0100b in

combination with the appropriate DAC address, (n). The

supplycurrentisreducedapproximately10%foreachDAC

powered down. The integrated reference is automatically

powered down when external reference is selected using

command 0111b. In addition, all the DAC channels and

the integrated reference together can be put into power-

down mode using Power Down Chip command 0101b.

When the integrated reference and all DAC channels are

in power-down mode, the REF pin becomes high imped-

ance (typically > 1GΩ). For all power-down commands

the 16-bit data word is ignored.

DC output impedance is equivalent to load regulation, and

may be derived from it by simply calculating a change in

units from LSB/mA to ohms. The ampliﬁer’s DC output

impedance is 0.1Ω when driving a load well away from

the rails.

When drawing a load current from either rail, the output

voltage headroom with respect to that rail is limited by

the 50Ω typical channel resistance of the output devices

(e.g., when sinking 1mA, the minimum output voltage is

50Ω • 1mA, or 50mV). See the graph “Headroom at Rails

vs. Output Current” in the Typical Performance Charac-

teristics section.

The ampliﬁer is stable driving capacitive loads of up to

500pF.

Normal operation resumes after executing any command

that includes a DAC update, (as shown in Table 1) or using

theasynchronousLDACpin. TheselectedDACispowered

2636f

1...17 18 192021 22 23 24

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