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參數(shù)資料
| 型號： | LA7256 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | High-Fidelity Audio Signal Record/Playback Processing Circuit for VCR Products(用于高逼真度VCR的音頻信號錄音/重放處理芯片) |
| 中文描述： | 高保真音頻信號記錄/回放處理電路的錄像機(jī)產(chǎn)品（用于高逼真度錄像機(jī)的音頻信號錄音/重放處理芯片） |
| 文件頁數(shù)： | 2/9頁 |
| 文件大小： | 139K |
| 代理商： | LA7256 |
Operating Characteristics
at Ta = 25°C, V
CC
= 5 V, in the specified test circuit
Note: 1. Measure the input noise voltage after passing the pin 3 output (playback FM output) through a 1.1 MHz low-pass filter.
2. 1.3 MHz (70 mVp-p) + 1.7 MHz (180 mVp-p)
No. 4896-2/9
LA7256
Parameter
Symbol
Conditions
min
typ
max
Unit
[Playback Mode]
Circuit current
I
CCP
No input: the pin 14 influx current
13
18
23
mA
Voltage gain, CH1
G
VP1
Pin 20 input = 100 μVp-p, f = 1.5 MHz, pin 1 = low:
measure the pin 3 output.
72.5
75.5
78.5
dB
Voltage gain, CH2
G
VP2
Pin 17 input = 100 μVp-p, f = 1.5 MHz, pin 1 = high:
measure the pin 3 output.
72.5
75.5
78.5
dB
Voltage gain difference
G
VP
G
VP1
– G
VP2
Pin 20 input = 100 μVp-p, f = 1.5 MHz, pin 1 = low:
the ratio of the pin 3 outputs when pin 2 is high/low
–2
0
2
dB
EP gain emphasis
G
EP
1.7
2.4
3.1
dB
Frequency characteristics, CH1
f
P1
Pin 20 input = 100 μVp-p, pin 1 = low: the difference
in the levels on pin 3 when f = 2.2 MHz and 1.0 MHz
–3.0
–1.0
0
dB
Pin 17 input = 100 μVp-p, f = 1.5 MHz, pin 1 = high:
the difference in the levels on pin 3 when f = 2.2 MHz
and 1.0 MHz
Frequency characteristics, CH2
f
P2
–3.0
–1.0
0
dB
Pin 17 input = 0, pin 20 input = 100 μVp-p, f = 1.5 MHz:
the difference in the pin 3 output levels when pin 1 goes
from low to high
Crosstalk CH1 to CH2
CT
1
→
2
–40
–35
dB
Pin 20 input = 0, pin 17 output = 100 μVp-p, f = 1.5 MHz:
the difference in the pin 3 output levels when pin 1 goes
from high to low
With pin 20 grounded through 0.01 μF and 1
,
pin 1 = low: the pin 3 noise in input equivalent
*
1
With pin 17 grounded through 0.01 μF and 1
,
pin 1 = high: the pin 3 noise in input equivalent
*
1
Crosstalk CH2 to CH1
CT
2
→
1
–40
–35
dB
Equivalent input noise voltage CH1
V
NP1
0.8
1.0
μVrms
Equivalent input noise voltage CH2
V
NP2
0.8
1.0
μVrms
Second harmonic distortion CH1
2THD
1
Pin 20 input = 100 μVp-p, f = 1.5 MHz, pin 1 = low:
the second harmonic in the pin 3 output
–50
–40
dB
Second harmonic distortion CH2
2THD
2
Pin 17 input = 100 μVp-p, f = 1.5 MHz, pin 1 = high:
the second harmonic in the pin 3 output
–50
–40
dB
Maximum output voltage CH1
V
OMP1
With the pin 20 input varying, f = 1.5 MHz, pin 1 = low:
when the pin 3 third harmonic distortion is –30 dB
2.0
Vp-p
Maximum output voltage CH2
V
OMP2
With the pin 17 input varying, f = 1.5 MHz, pin 1 = high:
when the pin 3 third harmonic distortion is –30 dB
2.0
Vp-p
Pin 17 and 20 inputs = 0, pin 1 = low, pin 2 = low (SP):
the difference in the pin 3 DC level when pin 1 goes
from low to high
Output DC offset 1
V
ODC1
–30
0
+30
mV
Pin 17 and 20 inputs = 0, pin 1 = low, pin 2 = high (EP):
the difference in the pin 3 DC level when pin 1 goes
from low to high
Output DC offset 2
V
ODC2
–50
0
+50
mV
Head switching: CH1 hold voltage
V
HS1
V
HS2
The pin 1 DC voltage required to operate CH1
0
1.0
V
Head switching: CH2 hold voltage
The pin 1 DC voltage required to operate CH2
3.0
V
CC
V
Playback mode switch
on resistance
R
SW
Calculate from the voltage difference on pin 16
when the pin 16 influx current is 1 mA and 2 mA.
4.0
6.0
SP hold voltage
V
2
SP
V
2
EP
V
5L
The pin 2 voltage required to hold SP mode
0
1.0
V
EP hold voltage
The pin 2 voltage required to hold EP mode
3.0
V
CC
1.0
V
PB hold voltage
The pin 5 voltage required to hold PB mode
0
V
[Record Mode]
Circuit current
I
CCR
No signal, the pin 14 influx current
45
63
81
mA
Output current
I
OR
Pin 9 input = 180 mVp-p, f = 1.5 MHz:
measure the pin 16 output
48
53
58
mAp-p
AGC control characteristics 1
V
AGC1
Pin 9 input = 90 and 180 mVp-p, f = 1.5 MHz:
the ratio of the pin 16 output levels
–0.5
–0.2
dB
AGC control characteristics 2
V
AGC2
Pin 9 input = 360 and 180 mVp-p, f = 1.5 MHz:
the ratio of the pin 16 output levels
For a pin 9 input
*
2
, the 0.4 MHz spurious signal
in the pin 16 output current
For a pin 9 input
*
2
, the 0.9 MHz spurious signal
in the pin 16 output current
0.2
0.5
dB
Cross modulation distortion
0.4 MHz component
CMD
04
–40
dB
Cross modulation distortion
0.9 MHz component
CMD
09
–40
dB
Continued on next page.
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