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參數(shù)資料
| 型號： | LTC1099CSW#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/D CONV 8BIT HI-SPEED 20SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 3 |
| 功率耗散（最大）： | 55mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
LTC1099
11
ANALOG INTERFACE
UU
APPLICATIONS
Analog Multiplier
The schematic Figure 9 shows the LTC1099 configured
with a DAC to form a two quadrant analog multiplier. An
input waveform is applied to the LTC1099 where it is
digitized at a 300kHz rate. The digitized signal is fed to the
DAC in “flow-through” mode where another signal is input
to the DAC reference input. In this way, the two analog
signals are multiplied to produce a double sideband ampli-
tude modulated output. Figure 10 shows a 3kHz sine wave
multiplied by a 100Hz triangle.
–
+
1
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7
1
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10
1
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N/C
CLK
3MHz
OSC
5V
OUT
74LS90
LT1019-5
÷ 10 = 300kHz
= ANALOG GROUND
= DIGITAL GROUND
15VIN
5VREF
AGND
25k
OUT
TRIM
GND
IN
LTC1099
DB0
DB1
DB2
DB3
WR/RDY
MODE
RD
INT
GND
CS
WR1
GND
DI5
DI4
DI3
DI2
DI1
DI0
VREF
RFB
VCC
WR2
XFER
DI6
DI7
DI8
DI9
DI10
DI11
IOUT2
IOUT1
DB7
DB6
DB5
DB4
CS
REF+
REF –
BYTE 1/
BYTE 2
(VIN1) 0V TO 5V
ANALOG
INPUT
(VIN2) +10V TO –10V
ANALOG
INPUT
CS AND RD LOW
4
DB0-DB3
4
DB4-DB7
88
MICROLINEAR
MP1208 DAC
12V
10
F
4.7
F
0.01
F
10
F
50k
OFFSET NULL
15V
–15V
15V
10pF
1
5
LT1056
5V
Figure 9
Note that since this is only a two quadrant multiplier, a
carrier component (the input to the LTC1099) will appear
in the output spectrum. Figure 11 shows the frequency
spectrum of a 42.5kHz sine wave multiplied by a 5kHz sine
wave. The depth of modulation is about 30dB. Figure 12
shows a 42.375kHz sine wave multiplied by a 30.875kHz
sine wave. Note that at these higher frequencies, the depth
of modulation is still about 30dB. The carrier feed-through
is seen in Figure 12.
VIN1 0V TO 5V
TRIANGLE INTO LTC1099
~100Hz
VIN2 ±4.8V SINE
INTO DAC ~ 3kHz
1099 F10
Figure 10
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