參數(shù)資料
型號: MT88L70ASR
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 信令電路
英文描述: 3 Volt Integrated DTMF Receiver
中文描述: TELECOM, DTMF SIGNALING CIRCUIT, PDSO18
封裝: 0.300 INCH, MS-013AB, SOIC-18
文件頁數(shù): 6/16頁
文件大小: 474K
代理商: MT88L70ASR
MT88L70
Data Sheet
6
Zarlink Semiconductor Inc.
Differential Input Configuration
The input arrangement of the MT88L70 provides a differential-input operational amplifier as well as a bias source
(V
Ref
) which is used to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the op-
amp output (GS) for adjustment of gain. In a single-ended configuration, the input pins are connected as shown in
Figure 6 with the op-amp connected for unity gain and V
Ref
biasing the input at 1/2V
DD
. Figure 5 shows the
differential configuration, which permits the adjustment of gain with the feedback resistor R
5
.
Figure 5 - Differential Input Configuration
Crystal Oscillator
The internal clock circuit is completed with the addition of an external 3.579545 MHz crystal and is connected as
shown in Figure 6 (Single-ended Input Configuration).
C
1
R
1
C
2
R
4
IN+
IN-
R
5
R
2
R
3
GS
V
Ref
+
-
MT88L70
DIFFERNTIAL INPUT AMPLIFIER
C
1
= C
2
= 10 nF
R
1
= R
= R
= 100 k
R
2
= 60 k
, R
3
, = 37.5 k
R
3
=
R
2
+ R
5
VOLTAGE GAIN (A
V
diff) =
R5
R
2
R
5
R1
INPUT IMPEDANCE
(Z
INDIFF
) = 2
R
12
+
1
ω
C
2
All resistors are
±
1% tolerance.
All capacitors are
±
5% tolerance.
相關PDF資料
PDF描述
MT88L70ASR1 3 Volt Integrated DTMF Receiver
MT88L70ANR1 3 Volt Integrated DTMF Receiver
MT88L70ANR 3 Volt Integrated DTMF Receiver
MT88L70AS 3 Volt Integrated DTMF Receiver
MT88L70AS1 3 Volt Integrated DTMF Receiver
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