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參數(shù)資料
| 型號(hào)： | AD7112CN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | DAC |
| 英文描述： | LC2MOS LOGDAC Dual Logarithmic D/A Converter |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 230K |
| 代理商： | AD7112CN |
AD7112
REV. 0
–11–
OUTPUT
INPUT
VARIABLE
GAIN ELEMENT
1/2 AD7112
D
UP/DOWN COUNTER
U
V
REF
END STOP AND
CONTROL LOGIC
DETECTOR
COMPARATOR
Figure 21. Automatic Gain Control System
Programmable State Variable Filter
T he AD7112 with its multiplying capability and fast settling
time is ideal for many types of signal conditioning applications.
T he circuit of Figure 22 shows its use in a state variable filter
design. T his type of filter has three outputs: low pass, bandpass
and high pass. T he particular version shown in Figure 22 uses
two AD7112 to control the critical parameters f
0
, Q and A
0
. In-
stead of several fixed resistors, the circuit uses the DAC equiva-
lent resistances as circuit elements. T hus, R1 in Figure 22 is
controlled by the 8-bit word loaded to DAC A1 of the AD7112.
T his is also the case with R2, R3 and R4.
DAC Equivalent Resistance,
R
EQ
=
R
DAC
10
×
EX P
(±0.375
×
N
/20)
where:
R
DAC
is
the DAC ladder resistance.
N
is the DAC code in Decimal (0
≤
N
≤
240).
DACs A1 and B1 control the gain and Q of the filter character-
istic while DACs A2 and B2 control the cutoff frequency.
Circuit equations:
C1 = C2, R3 = R4, R7 = R8.
Resonant frequency, f
0
= 1/(2
π
R3C1).
Quality factor, Q = (R6/R8)
×
(R2/R
FBB1
).
R
FBB1
is the feedback resistance of DAC B1 in Figure 22
Bandpass Gain, A
0
= –R2/R1.
Programmable range for component values shown is f
0
= 0 kHz
to 15 kHz and Q = 0.3 to 4.5.
DATA 2
OUT A
AD7112
DAC A1
(R1)
V
IN
A
R
FB
B
C3
10pF
V
IN
NOTES
1. A1, A2, A3, A4 : 1/4 x AD713
2. C3 IS A COMPENSATION CAPACITOR TO ELIMINATE Q AND GAIN VARIATIONS
CAUSED BY AMPLIFIER GAIN BANDWIDTH LIMITATIONS
HIGH
OUTPUT
OUT B
DAC B1
(R2)
BANDPASS
OUTPUT
V
IN
B
LOW-PASS
OUTPUT
R7
30k
R8
30k
R6
10k
C1
1000pF
C2
1000pF
R5
DB0–DB7
CS
WR
DAC A/
DAC B
DATA 1
D(R3)
D(R4)
A1
OUT A
AD7112
V
IN
A
OUT B
V
IN
B
DB0–DB7
CS
WR
DAC A/
DAC B
A2
A3
A4
Figure 22. Programmable State Variable Filter
相關(guān)PDF資料 |
PDF描述 |
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| AD7112CR | ECONOLINE: REC2.2-S_DR/H1 - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- UL94V-0 Package Material- Continuous Short Circiut Protection- Internal SMD design- 100% Burned In- Efficiency to 75% |
| AD7112* | LC2MOS LOGDAC Dual Logarithmic D/A Converter |
| AD7118UQ2 | CAT6 SOL PC GRE PLE 20FT PLENUM SOLID PATCH CORD |
| AD7118 | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD7118BQ | LOGDAC CMOS Logarithmic D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7112CNZ | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 17-bit 20-Pin PDIP N Tube |
| AD7112CR | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 17-bit 20-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:DUAL LOGDAC IC - Bulk |
| AD7112CR-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD7112CRZ | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 17-bit 20-Pin SOIC W |
| AD71153ACPZ | 制造商:Analog Devices 功能描述: |
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