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參數(shù)資料
| 型號(hào)： | ISPPAC10-01PI |
| 廠商： | LATTICE SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | In-System Programmable Analog Circuit |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 12/23頁(yè) |
| 文件大?。?/td> | 415K |
| 代理商： | ISPPAC10-01PI |
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Specifications
ispPAC10
12
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
Figure 7a. Biquad Bandpass Filter Block Diagram
B
1 +
s
p1
A
s
Error
VIN
(IN1)
VFB
VOUT1
(OUT1)
VOUT2
(OUT2)
∑
and the schematic from PAC-Designer is shown in Figure
7b. 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.
Figure 7b. Biquad Bandpass Filter Schematic
1
8.19pF
-1
1
16.05pF
OA1
IA1
IA2
IA3
IA4
OA2
PACblock 1
PACblock 2
IN1
IN2
OUT1
OUT2
2.5V
2.5V
-1
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
The result is a circuit whose transfer function is:
m
F
2
1
IN
OUT
V
g
2
sC
–
k
k
V
-
=
(8)
The gains k
1
and k
2
are independently set by the user;
this circuit can either amplify or attenuate an input signal.
The one in the denominator is due to R
F
; if R
F
is disabled,
Theory of Operation (Continued)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISPPAC10-01SI | In-System Programmable Analog Circuit |
| ISPPAC20 | In-System Programmable Analog Circuit |
| ISPPAC20-01J | In-System Programmable Analog Circuit |
| ISPPAC20-01JI | In-System Programmable Analog Circuit |
| ISPPAC30 | In-System Programmable Analog Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISPPAC10-01SI | 功能描述:SPLD - 簡(jiǎn)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?cái)?shù)量:10 最大工作頻率:66 MHz 延遲時(shí)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 | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:In-System Programmable Analog Circuit |
| ISPPAC20-01J | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:In-System Programmable Analog Circuit |
| ISPPAC20-01JI | 功能描述:SPLD - 簡(jiǎn)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?cái)?shù)量:10 最大工作頻率:66 MHz 延遲時(shí)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(jiǎn)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?cái)?shù)量:10 最大工作頻率:66 MHz 延遲時(shí)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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