For more information www.linear.com/LTC2641 operaTion high-to-low transition" />
參數資料
型號: LTC2641IDD-16#TRPBF
廠商: Linear Technology
文件頁數: 4/24頁
文件大?。?/td> 0K
描述: IC DAC 16BIT VOUT 8-DFN
產品培訓模塊: Open Loop DAC
標準包裝: 2,500
設置時間: 1µs
位數: 16
數據接口: 串行
轉換器數目: 1
電壓電源: 單電源
功率耗散(最大): 600µW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-WFDFN 裸露焊盤
供應商設備封裝: 8-DFN-EP(3x3)
包裝: 帶卷 (TR)
輸出數目和類型: 1 電壓,單極
采樣率(每秒): *
LTC2641/LTC2642
12
26412fc
For more information www.linear.com/LTC2641
operaTion
high-to-low transition, the data on DIN is loaded, MSB
first, into the shift register on each rising edge of the serial
clock input (SCLK). After 16 data bits have been loaded
into the serial input register, a low-to-high transition on
CS transfers the data to the 16-bit DAC latch, updating
the DAC output (see Figures 1a, 1b, 1c). While CS remains
high, the serial input shift register is disabled. If there
are less than 16 low-to-high transitions on SCLK while
CS remains low, the data will be corrupted, and must be
reloaded.Also,iftherearemorethan16low-to-hightransi-
tions on SCLK while CS remains low, only the last 16 data
bits loaded from DIN will be transferred to the DAC latch.
For the 14-bit DACs, (LTC2641-14/LTC2642-14), the MSB
remains in the same (left-justified) position in the input
16-bit data word. Therefore, two “don’t-care” bits must
be loaded after the LSB, to make up the required 16 data
bits (Figure 1b). Similarly, for the 12-bit family members
(LTC2641-12/LTC2642-12) four “don’t-care” bits must
follow the LSB (Figure 1c).
Power-On Reset
The LTC2641/LTC2642 include a power-on reset circuit
to ensure that the DAC ouput comes up in a known state.
When VDD is first applied, the power-on reset circuit
sets the output of the LTC2641 to zero-scale (code 0).
The LTC2642 powers up to midscale (bipolar zero). De-
pending on the DAC number of bits, the midscale code
is: 32,768 (LTC2642-16); 8,192 (LTC2642-14); or 2,048
(LTC2642-12).
Clearing the DAC
A 10ns (minimum) low pulse on the CLR pin asynchro-
nously clears the DAC latch to code zero (LTC2641) or to
midscale (LTC2642).
Figure 1c. 12-Bit Timing Diagram (LTC2641-12/LTC2642-12)
Figure 1b. 14-Bit Timing Diagram (LTC2641-14/LTC2642-14)
Figure 1a. 16-Bit Timing Diagram (LTC2641-16/LTC2642-16)
D15
MSB
1
CS
SCLK
DIN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D14 D13 D12 D11 D10 D9
D8
DATA (16 BITS)
D7
D6
D5
D4
D3
D2
D1
D0
DAC
UPDATED
LSB
26412 F01a
D13
MSB
1
CS
SCLK
DIN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D12 D11 D10 D9
D8
D7
D6
DATA (14 BITS + 2 DON’T-CARE BITS)
D5
D4
D3
D2
D1
D0
X
DAC
UPDATED
LSB
26412 F01b
MSB
1
CS
SCLK
DIN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D11 D10 D9
D8
D7
D6
DATA (12 BITS + 4 DON’T-CARE BITS)
D5
D4
D3
D2
D1
D0
X
DAC
UPDATED
LSB
26412 F01c
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