APPLICATIONS INFOR
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� LTC1562CG
寤犲晢锛� Linear Technology
鏂囦欢闋佹暩(sh霉)锛� 27/28闋�
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC FILTER UNIVRSL RC QUAD 20SSOP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 66
婵炬尝鍣ㄩ鍨嬶細 閫氱敤閫ｇ簩(x霉)瑷堟檪
闋荤巼 - 鎴鎴栦腑蹇冿細 150kHz
婵炬尝鍣ㄦ暩(sh霉)锛� 4
婵炬尝鍣ㄩ殠鏁�(sh霉)锛� 8th
闆绘簮闆诲锛� 4.75 V ~ 10.5 V锛�±4.75 V ~ 5.25 V
瀹夎椤炲瀷锛� 琛ㄩ潰璨艰
灏佽/澶栨锛� 20-SSOP锛�0.209"锛�5.30mm 瀵級
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 20-SSOP
鍖呰锛� 绠′欢
8
LTC1562
1562fa
APPLICATIONS INFORMATION
WU
U
tolerance (by a factor of 2 incrementally), but it also
implies that R2 has a wider range than fO. (RQ and RIN also
tend to scale with R2.) At high fO these resistors fall below
5k, heavily loading the outputs of the LTC1562 and leading
to increased THD and other effects. At the other extreme,
a lower fO limit of 10kHz reflects an arbitrary upper
resistor limit of 1M
. The LTC1562鈥檚 MOS input circuitry
can accommodate higher resistor values than this, but
junction leakage current from the input protection cir-
cuitry may cause DC errors.
The 2nd order transfer functions HLP(s), HBP(s) and
HHP(s) (below) are all inverting so that, for example, at DC
the lowpass gain is 鈥� HL. If two such sections are cas-
caded, these phase inversions cancel. Thus, the filter in the
application schematic on the first page of this data sheet
is a dual DC preserving, noninverting, rail-to-rail lowpass
filter, approximating two 鈥渟traight wires with frequency
selectivity.鈥�
Figure 4 shows further details of 2nd order lowpass,
bandpass and highpass responses. Configurations to
obtain these responses appear in the next three sections.
Basic Lowpass
When ZIN of Figure 3 is a resistor of value RIN, a standard
2nd order lowpass transfer function results from VIN to V2
(Figure 5):
Vs
Hs
H
sQ s
IN
LP
LO
OO
2
()
鈥�
/
==
+
() +
蠅
蠅蠅
The DC gain magnitude is HL = R2/RIN. (Note that the
transfer function includes a sign inversion.) Parameters
蠅O (= 2蟺fO) and Q are set by R2 and RQ as above. For a 2nd
order lowpass response the gain magnitude becomes QHL
INV
V1
2nd ORDER
1/4 LTC1562
V2
1562 F05
R2
RQ
RIN
VIN
VOUT
fL
GAIN
(V/
V)
0.707 HB
HB
fO
f (LOG SCALE)
BANDPASS RESPONSE
fH
GAIN
(V/
V)
0.707 HL
HP
HL
HH
fP
f (LOG SCALE)
LOWPASS RESPONSE
fC
GAIN
(V/
V)
0.707 HH
HP
fP
f (LOG SCALE)
HIGHPASS RESPONSE
Q
f
ff
ff f
ff
QQ
ff
QQ
O
HL
OL H
L
O
HO
==
=
+
+
=+
+
鈥�
;
鈥�1
2
1
2
1
2
1
2
1
2
ff
QQ
ff
Q
HH
Q
CO
PO
PL
=
+
+
=
1
2
1
2
1
2
1
4
22
2
鈥撯€�
鈥�
ff
QQ
ff
Q
HH
Q
CO
PO
PH
=
+
+
=
=
1
2
1
2
1
2
1
4
22
2
1
2
1
2
鈥撯€�
鈥�
Figure 4. Characteristics of Standard 2nd Order Filter Responses
Figure 5. Basic Lowpass Configuration
鐩搁棞(gu膩n)PDF璩囨枡
PDF鎻忚堪
LTC1562CG-2 IC FILTER UNIVRSL RC QUAD 20SSOP
LTC1562CN#PBF IC FILTER UNIV RC QUAD LN 16DIP
LTC1562CN IC FILTER UNIV RC QUAD LN 16DIP
LTC1562CG#TRPBF IC FILTER UNIV RC QUAD LN 20SSOP
LTC1562CG-2#TRPBF IC FILTER UNIV RC QUAD LN 20SSOP
鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉)
鍙冩暩(sh霉)鎻忚堪
LTC1562CG#PBF 鍔熻兘鎻忚堪:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鎺ュ彛 - 婵炬尝鍣� - 鏈夋簮 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 婵炬尝鍣ㄩ鍨�:閫ｇ簩(x霉)鏅傞枔锛屽付閫氫綆閫� 闋荤巼 - 鎴鎴栦腑蹇�:150kHz 婵炬尝鍣ㄦ暩(sh霉):4 婵炬尝鍣ㄩ殠鏁�(sh霉):8th 闆绘簮闆诲:4.74 V ~ 11 V锛�±2.37 V ~ 5.5 V 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:28-SOIC锛�0.295"锛�7.50mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:28-SOIC W 鍖呰:甯跺嵎 (TR)
LTC1562CG#TR 鍔熻兘鎻忚堪:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:鍚� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鎺ュ彛 - 婵炬尝鍣� - 鏈夋簮 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 婵炬尝鍣ㄩ鍨�:閫ｇ簩(x霉)鏅傞枔锛屽付閫氫綆閫� 闋荤巼 - 鎴鎴栦腑蹇�:150kHz 婵炬尝鍣ㄦ暩(sh霉):4 婵炬尝鍣ㄩ殠鏁�(sh霉):8th 闆绘簮闆诲:4.74 V ~ 11 V锛�±2.37 V ~ 5.5 V 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:28-SOIC锛�0.295"锛�7.50mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:28-SOIC W 鍖呰:甯跺嵎 (TR)
LTC1562CG#TRPBF 鍔熻兘鎻忚堪:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鎺ュ彛 - 婵炬尝鍣� - 鏈夋簮 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 婵炬尝鍣ㄩ鍨�:閫ｇ簩(x霉)鏅傞枔锛屽付閫氫綆閫� 闋荤巼 - 鎴鎴栦腑蹇�:150kHz 婵炬尝鍣ㄦ暩(sh霉):4 婵炬尝鍣ㄩ殠鏁�(sh霉):8th 闆绘簮闆诲:4.74 V ~ 11 V锛�±2.37 V ~ 5.5 V 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:28-SOIC锛�0.295"锛�7.50mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:28-SOIC W 鍖呰:甯跺嵎 (TR)
LTC1562CG-2 鍔熻兘鎻忚堪:IC FILTER UNIVRSL RC QUAD 20SSOP RoHS:鍚� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鎺ュ彛 - 婵炬尝鍣� - 鏈夋簮 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 婵炬尝鍣ㄩ鍨�:閫ｇ簩(x霉)鏅傞枔锛屽付閫氫綆閫� 闋荤巼 - 鎴鎴栦腑蹇�:150kHz 婵炬尝鍣ㄦ暩(sh霉):4 婵炬尝鍣ㄩ殠鏁�(sh霉):8th 闆绘簮闆诲:4.74 V ~ 11 V锛�±2.37 V ~ 5.5 V 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:28-SOIC锛�0.295"锛�7.50mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:28-SOIC W 鍖呰:甯跺嵎 (TR)
LTC1562CG-2#PBF 鍔熻兘鎻忚堪:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:鏄� 椤炲垾:闆嗘垚闆昏矾 (IC) >> 鎺ュ彛 - 婵炬尝鍣� - 鏈夋簮 绯诲垪:- 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 婵炬尝鍣ㄩ鍨�:閫ｇ簩(x霉)鏅傞枔锛屽付閫氫綆閫� 闋荤巼 - 鎴鎴栦腑蹇�:150kHz 婵炬尝鍣ㄦ暩(sh霉):4 婵炬尝鍣ㄩ殠鏁�(sh霉):8th 闆绘簮闆诲:4.74 V ~ 11 V锛�±2.37 V ~ 5.5 V 瀹夎椤炲瀷:琛ㄩ潰璨艰 灏佽/澶栨:28-SOIC锛�0.295"锛�7.50mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:28-SOIC W 鍖呰:甯跺嵎 (TR)
鐧�(f膩)甯冪穵鎬ラ噰璩�锛�3鍒嗛悩宸﹀彸鎮ㄥ皣寰楀埌鍥炲京(f霉)銆�

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*鍨嬭櫉 *鏁�(sh霉)閲� 寤犲晢 鎵硅櫉 灏佽
娣诲姞鏇村閲囪臣

鎴戠殑鑱�(li谩n)绯绘柟寮�

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