参数资料
| 型号： | LTC2622IMS8 |
| 厂商： | Linear Technology |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT DUAL R-R VOUT 8MSOP |
| 标准包装： | 50 |
| 设置时间： | 7µs |
| 位数： | 12 |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 6.5mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 输出数目和类型： | 2 电压，单极 |
| 采样率（每秒）： | * |
10
LTC2602/LTC2612/LTC2622
2602fa
OPERATIO
U
Serial Interface
The CS/LD input is level triggered. When this input is taken
low, it acts as a chip-select signal, activating the SDI and
SCK buffers and enabling the input shift register. Data
(SDI input) is transferred at 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 16-, 14- or 12-bit input code,
ordered MSB-to-LSB, followed by 0, 2 or 4 don’t-care bits
(LTC2602, LTC2612 and LTC2622 respectively). Data can
only be transferred to the device when the CS/LD signal is
low.The rising edge of CS/LD ends the data transfer and
causes the device to carry out the action specified in the
24-bit input word. The complete sequence is shown in
Figure 2a.
The command (C3-C0) and address (A3-A0) assignments
are shown in Table 1. The first four commands in the table
consist of write and update operations. A write operation
loads a 16-bit data word from the 32-bit shift register into
the input register of the selected DAC, n. An update
operation copies the data word from the input register to
the DAC register. Once copied into the DAC register, the
data word becomes the active 16-, 14- or 12-bit input
code, and is converted to an analog voltage at the DAC
output. The update operation also powers up the selected
DAC if it had been in power-down mode. The data path and
registers are shown in the block diagram.
While the minimum input word is 24 bits, it may optionally
be extended to 32 bits to accommodate microprocessors
which have a minimum word width of 16 bits (2 bytes). To
use the 32-bit word width, 8 don’t-care bits are transferred
to the device first, followed by the 24-bit word as just
described. Figure 2b shows the 32-bit sequence.
Power-Down Mode
For power-constrained applications, power-down mode
can be used to reduce the supply current whenever less
than two outputs are needed. When in power-down, the
buffer amplifiers, bias circuits and reference inputs are
disabled, and draw essentially zero current. The DAC
outputs are put into a high-impedance state, and the
Power-On Reset
The LTC2602/LTC2612/LTC2622 clear the outputs to zero
scale when power is first applied, making system initializa-
tion consistent and repeatable.
For some applications, downstream circuits are active
during DAC power-up, and may be sensitive to nonzero
outputs from the DAC during this time. The LTC2602/
LTC2612/LTC2622 contain circuitry to reduce the power-
on glitch; furthermore, the glitch amplitude can be made
smaller by reducing the ramp rate of the power supply. For
example, if the power supply is ramped to 5V in 1ms, the
analog outputs rise less than 10mV above ground (typ)
during power-on. See Power-On Reset Glitch in the Typi-
cal Performance Characteristics section.
Power Supply Sequencing
The voltage at REF (Pin 4) should be kept within the range
– 0.3V
≤ VREF ≤ VCC + 0.3V (see Absolute Maximum
Ratings). Particular care should be taken to observe these
limits during power supply turn-on and turn-off sequences,
when the voltage at VCC (Pin 6) is in transition.
Transfer Function
The digital-to-analog transfer function is
V
k
V
OUT IDEAL
N
REF
() =
2
where k is the decimal equivalent of the binary DAC input
code, N is the resolution and VREF is the voltage at REF
(Pin 4).
Table 1.
COMMAND*
C3
C2
C1
C0
0000
Write to Input Register n
0001
Update (Power Up) DAC Register n
0010
Write to Input Register n, Update (Power Up) All n
0011
Write to and Update (Power Up) n
0100
Power Down n
1111
No Operation
ADDRESS (n)*
A3
A2
A1
A0
0000
DAC A
0001
DAC B
1111
All DACs
*Command and address codes not shown are reserved and should not be used.
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相关代理商/技术参数 |
参数描述 |
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| LTC2622IMS8#PBF | 功能描述:IC DAC 12BIT DUAL R-R VOUT 8MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| LTC2622IMS8#TR | 功能描述:IC DAC 12BIT DUAL R-R VOUT 8MSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| LTC2622IMS8#TRPBF | 功能描述:IC DAC 12BIT DUAL R-R VOUT 8MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| LTC2622IMS8PBF | 制造商:Linear Technology 功能描述:DAC Dual 12-Bit Rail-to-Rail MSOP8 |
| LTC-2623B | 功能描述:LED 显示器和配件 Blue 4 Dig 0.28" Ht 466nm 3000ucd RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
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