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參數(shù)資料
| 型號： | L3924A |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 209K |
| 代理商： | L3924A |
ELECTRICALCHARACTERISTICS
(continued)
Symbol
V
DTMF
Parameter
Test Condition
R
DTMF
= 2.25K
,
C
DTMF
= 22nF
Min.
Typ.
Max.
Unit
Fig.
DTMF Level on the line
High Frequency Group
Low Frequency Group
Pre-emphasis
DTMF Output Distortion
DTMF Att. pin Impedance
Receive Gain
–8
–10
1.0
–6
–8
2
5
32
–4
–6
3.0
8
dBm
dBm
dB
%
K
7
P
EI
DIS
Z
DTMF
G
RX
7
7
V
inp
= 5mVrms; R
e
= 300
R
GRX
= 100K
I
L
= 15mA
I
L
= 60mA
I
L
=15mA; R
e
= 300
R
GRX
= 10K
R
GRX
= 300K
I
L
= 15mA; R
GRX
= 100K
R
e
= 150
;
V
C
= 0.25V
rms
R
e
= 300
;
V
C
= 0.45V
rms
R
e
= 450
; V
C
= 0.55V
rms
I
L= 15mA;
R
L
= 300
;
R
GRX
= 100K
; V
INP
= 0V
I
L
= 15mA
I
L
= 15mA; R
p
=
∞
R
p
= 430K
29.5
24
–20
31.0
26
32.5
28
+10
dB
dB
dB
dB
dB
8
A
GRX
Receive GainVariation
–20
+10
8
D
RX
Reveive Output Distortion
2
2
2
%
%
%
μ
V
8
N
RX
Receive Noise
200
8
Z
OUT
V
PT
Receive Output Impedance
Pacifier Tone Level on
Earphone
KEYBOARD INTERFACE
TKD
FKS
KRU
KRD
Keypad Pulldown Resistance
PULSE MODE
TPT
FPT
PR
TB
TM
IDP
PDP
Predigit Pause
TONE MODE
TRIS
TR
TPSD
TISD
TDUR
Tone Output Duration
THD
Hold Mode Delay
tHFP
Hook Flash Timing
35
60
600
8
8
mVrms
mVrms
Keypad Debounce Time
Keypad Scan Frequency
Keypad Pullup Resistance
32
250
100
500
ms
Hz
K
Pacifier Tone Duration
Pacifier Tone Frequency
Pulse Rate
Break Time
Make Time
Inter Digit Pause
75
500
10
60
40
820
50
ms
Hz
PPS
ms
ms
ms
ms
Tone Output Rise Time
Tone Signalling Rate
Pre Signal Delay
Inter SignalDelay
40
5
100
100
400
585
300
100
5
ms
1/s
ms
ms
ms
ms
ms
ms
ms
L3914A
L3924A
L3934A
Notes:
1. All inputs unloaded. Quiescent mode (oscillatoroff).
2. Pulse outputsink current for V
OUT
= 0.5V.
3. Pacifier tone sink current for V
= 0.5V.Source current for V
= 2.5V.
4. Memory retention voltage is the point where memory is guaranteedbut circuit operation is not. Proper memory retention is guaranteed if
either theminimum IMR is provided or the minimum VMR. The design does not have to provide both the minimum currentand voltage
simultaneously.
L3914A - L3924A - L3934A
8/15
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