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參數(shù)資料
| 型號： | ISPPAC20-01J |
| 廠商： | LATTICE SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | In-System Programmable Analog Circuit |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 15/32頁 |
| 文件大?。?/td> | 525K |
| 代理商： | ISPPAC20-01J |
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Specifications
ispPAC20
15
Theory of Operation (Continued)
Integrator
. Switching out R
F
(turning off IAF) removes
the feedback element as shown in Figure 6. The
integrator
’
s transfer function can be derived from Equa-
tion 5b by setting g
m3
= 0 (open circuit IAF (R
F
)).
Figure 6. PAC-Designer PACblock Integrator
(IAF Disabled; g
m3
= 0)
k
1
k
2
V
OUT
V
IN1
V
IN2
C
F
R
F
IA1
IA2
OA1
2.5V
m
F
IN2
V
2
IN1
V
1
OUT
V
g
2
sC
k
k
+
=
(7)
The integrator slope is proportional to 1/f and, for the case
of a single input, the transfer function magnitude equals
|k| when the frequency is (1/2
π
)(2g
m
/C). The integrator
should not be used as a stand-alone circuit element. It
needs to be used in configurations that provide DC
feedback to ensure the output does not saturate, as
illustrated by the biquad filter circuit below.
Application Examples
Biquad Filter
. By simply combining the two structures,
the integrator providing feedback around the lossy inte-
grator, creates a useful circuit. The block diagram is
shown in Figure 7a and the schematic from PAC-De-
signer is shown in Figure 7b.
Figure 7a. Biquad Bandpass Filter Block Diagram
B
1 +
s
p1
A
s
Error
VIN
(IN1)
VFB
VOUT1
(OUT1)
VOUT2
(OUT2)
∑
Figure 7b. Biquad Bandpass Filter Schematic
OA1
IA2
1
IA1
-1
15.08 pF
OA2
IA3
-1
IA4
-1
30.15 pF
Polarity Control: PC pin
SRE=on
2.5V
2.5V
IN1
IN2
IN3
OUT1
OUT2
MSEL = A
PC = 0
3V
1.5V
PACblock 1
PACblock 2
a
b
The transfer function OUT1(s)/IN1(s) is a band pass filter
with programmable gain, Q and center frequency. Note
the presence of DC feedback around the integrator. It can
also be seen that the transfer function V
FB
(s)/V
IN
(s)
implements a lowpass filter. This application is discussed
further in a separate application note.
To ease the design of Biquad Filters, PAC-Designer
contains a macro tool that allows a user to simply specify
filter corner, q factor and gain. This macro is accessed
under the Tools menu.
Attenuator
. The PACblock architecture makes varia-
tions possible on these two basic building blocks just
described. An example uses summation to connect an
input amplifier (IA2) in parallel with the feedback element
(R
F
), as shown in Figure 8.
Figure 8. PACblock A
V
< 1
k
1
C
F
OA1
IA1
IA2
2.5V
V
OUT
V
IN1
k
2
R
F
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| ISPPAC20-01JI | In-System Programmable Analog Circuit |
| ISPPAC30 | In-System Programmable Analog Circuit |
| ISPPAC30-01P | In-System Programmable Analog Circuit |
| ISPPAC30-01PI | In-System Programmable Analog Circuit |
| ISPPAC30-01S | In-System Programmable Analog Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISPPAC20-01JI | 功能描述:SPLD - 簡單可編程邏輯器件 PROGRAMMABLE ANALOG CIRCUIT RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池數(shù)量:10 最大工作頻率:66 MHz 延遲時間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
| ISPPAC20-01TI | 功能描述:SPLD - 簡單可編程邏輯器件 Not Upgrade Device CIRCUIT RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池數(shù)量:10 最大工作頻率:66 MHz 延遲時間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
| ISPPAC30 | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:In-System Programmable Analog Circuit |
| ISPPAC30-01P | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:In-System Programmable Analog Circuit |
| ISPPAC30-01PI | 功能描述:SPLD - 簡單可編程邏輯器件 PROGRAMMABLE ANALOG CIRCUIT RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池數(shù)量:10 最大工作頻率:66 MHz 延遲時間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
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