With the values of tRC given in Table 1, tCSS0
參數(shù)資料
型號: MAX532BEPE+
廠商: Maxim Integrated Products
文件頁數(shù): 3/16頁
文件大小: 0K
描述: IC MDAC 12BIT DUAL SER 16-DIP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 25
設(shè)置時間: 2.5µs
位數(shù): 12
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 2
電壓電源: 雙 ±
功率耗散(最大): 842mW
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 16-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 16-PDIP
包裝: 管件
輸出數(shù)目和類型: 2 電壓,單極;2 電壓,雙極
采樣率(每秒): *
With the values of tRC given in Table 1, tCSS0 is always
given by tDV + tDS. For different values of R or C, tRC
must be calculated to determine tCSS0.
Additionally, the maximum clock frequency is limited to
1
fCLK (max) =
————————————— .
2 x (tDO + tRC -15ns + tDS)
For example, with tRC = 15ns (5V ±10% supply with
1k
pull-up), the maximum clock frequency is 2MHz.
Digital-to-Analog Section
Figure 8 shows a simplified circuit diagram for one of
the DACs and the output amplifier.
A segmented scheme is used to improve linearity,
whereby the two MSBs of the 12-bit data word are
decoded to drive the three switches, SA, SB, and SC.
The remaining ten bits drive the switches S0 through S9
in a standard R-2R ladder configuration.
Each of the switches, SA, SB, and SC, steers 1/4 of the
total reference current with the remaining 1/4 passing
through the R-2R section.
The output amplifier and feedback resistor perform the
current-to-voltage conversion, giving the following:
VOUT_ = -D x VREF_,
where _ denotes A or B, and D is the fractional representa-
tion of the digital word. (D can be set from 0 to 4095/4096.)
MAX532
Dual, Serial-Input,
Voltage-Output, 12-Bit MDAC
______________________________________________________________________________________
11
VPULL-UP (V)
C (pF)
RP (k)tRC (ns)
4.5
20
1
15
4.5
35
1
27
4.5
50
1
38
4.5
100
1
76
4.5
150
1
114
11.4
20
3
14
11.4
35
3
25
11.4
50
3
35
11.4
100
3
71
11.4
150
3
106
13.5
20
3
12
13.5
35
3
21
13.5
50
3
29
13.5
100
3
59
13.5
150
3
88
Table 1. tRC Delay Times
RR
R
2R
SC
SB
SA
S9
S8
S0
R/2
RFB_
VOUT_
AGND_
SHOWN FOR ALL 1s ON DAC
VREF_
Figure 8. Simplified D/A Circuit Diagram
DACA
AGNDA
VSS
DGND
RFBA
VOUTA
VOUT
VIN
-12V to -15V
VDD
VREFA
+12V to +15V
MAX532
Figure 9. Unipolar Binary Operation
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