Datasheet > LTC2636HMS-LZ12#TR

LTC2636HMS-LZ12#TR

更新时间： 2024-02-14 10:41:24

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

INPUT WORD (LTC2636-12)

COMMAND

ADDRESS

DATA (12 BITS + 4 DON'T-CARE BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB

LSB

INPUT WORD (LTC2636-10)

COMMAND

ADDRESS

DATA (10 BITS + 6 DON'T-CARE BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB LSB

INPUT WORD (LTC2636-8)

COMMAND

ADDRESS

DATA (8 BITS + 8 DON'T-CARE BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

MSB LSB

2636 F02

Figure 2. Command and Data Input Format

Serial Interface

DAC if it had been in power-down mode. The data path

and registers are shown in the Block Diagram.

TheCS/LDinputisleveltriggered. Whenthisinputistaken

low, it acts as a chip-select signal, enabling the SDI and

SCK buffers and the input shift register. Data (SDI input)

is transferred into the LTC2636 on the next 24 rising SCK

edges. The 4-bit command, C3-C0, is loaded ﬁrst; then

the 4-bit DAC address, A3-A0; and ﬁnally the 16-bit data

word. The data word comprises the 12-, 10- or 8-bit

input code, ordered MSB-to-LSB, followed by 4, 6 or

8 don’t-care bits (LTC2636-12, -10 and -8 respectively;

see Figure 2). Data can only be transferred to the device

when the CS/LD signal is low, beginning on the ﬁrst rising

edge of SCK. SCK may be high or low at the falling edge

of CS/LD. The rising edge of CS/LD ends the data transfer

and causes the device to execute the command speciﬁed

in the 24-bit input sequence. The complete sequence is

shown in Figure 3a.

While the minimum input sequence is 24 bits, it may

optionally be extended to 32 bits to accommodate micro-

processors that have a minimum word width of 16 bits

(2 bytes). To use the 32-bit width, 8 don’t-care bits

must be transferred to the device ﬁrst, followed by the

24-bit sequence described. Figure 3b shows the 32-bit

sequence.

The 16-bit data word is ignored for all commands that do

not include a Write operation.

Reference Modes

For applications where an accurate external reference is

either not available, or not desirable due to limited space,

the LTC2636 has a user-selectable, integrated reference.

The integrated reference voltage is internally ampliﬁed

by 2x to provide the full-scale DAC output voltage range.

The LTC2636-LMI/-LMX/-LZ provides a full-scale DAC

output of 2.5V. The LTC2636-HMI/-HMX/-HZ provides a

full-scale DAC output of 4.096V. The internal reference

can be useful in applications where the supply voltage is

poorlyregulated. InternalReferencemodecanbeselected

by using command 0110b, and is the power-on default for

LTC2636-HZ/-LZ, as well as for LTC2636-HMI/-LMI.

The command (C3-C0) and address (A3-A0) assignments

are shown in Tables 1 and 2. The ﬁrst four commands in

Table 1 consist of write and update operations. A Write

operation loads a 16-bit data word from the 24-bit shift

Update operation copies the data word from the input

8-bit input code, and is converted to an analog voltage at

the DAC output. Write to and Update combines the ﬁrst

two commands. The Update operation also powers up the

The10ppm/°C,1.25V(LTC2636-LMI/-LMX/-LZ)or2.048V

(LTC2636-HMI/-HMX/-HZ) internal reference is available

2636f

1...15 16 171819 20 21...24

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