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参数资料
| 型号： | LA7256 |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2 CHANNEL, AUDIO PREAMPLIFIER, PDIP24 |
| 封装： | SDIP-24 |
| 文件页数： | 2/9页 |
| 文件大小： | 139K |
| 代理商： | LA7256 |
Operating Characteristics at Ta = 25°C, VCC = 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
ICCP
No input: the pin 14 influx current
13
18
23
mA
Voltage gain, CH1
GVP1
Pin 20 input = 100 Vp-p, f = 1.5 MHz, pin 1 = low:
72.5
75.5
78.5
dB
measure the pin 3 output.
Voltage gain, CH2
GVP2
Pin 17 input = 100 Vp-p, f = 1.5 MHz, pin 1 = high:
72.5
75.5
78.5
dB
measure the pin 3 output.
Voltage gain difference
G
VP
GVP1 – GVP2
–2
0
2
dB
EP gain emphasis
G
EP
Pin 20 input = 100 Vp-p, f = 1.5 MHz, pin 1 = low:
1.7
2.4
3.1
dB
the ratio of the pin 3 outputs when pin 2 is high/low
Frequency characteristics, CH1
fP1
Pin 20 input = 100 Vp-p, pin 1 = low: the difference
–3.0
–1.0
0
dB
in the levels on pin 3 when f = 2.2 MHz and 1.0 MHz
Pin 17 input = 100 Vp-p, f = 1.5 MHz, pin 1 = high:
Frequency characteristics, CH2
fP2
the difference in the levels on pin 3 when f = 2.2 MHz
–3.0
–1.0
0
dB
and 1.0 MHz
Pin 17 input = 0, pin 20 input = 100 Vp-p, f = 1.5 MHz:
Crosstalk CH1 to CH2
CT1 → 2
the difference in the pin 3 output levels when pin 1 goes
–40
–35
dB
from low to high
Pin 20 input = 0, pin 17 output = 100 Vp-p, f = 1.5 MHz:
Crosstalk CH2 to CH1
CT2 → 1
the difference in the pin 3 output levels when pin 1 goes
–40
–35
dB
from high to low
Equivalent input noise voltage CH1
VNP1
With pin 20 grounded through 0.01 F and 1
,
0.8
1.0
Vrms
pin 1 = low: the pin 3 noise in input equivalent*1
Equivalent input noise voltage CH2
VNP2
With pin 17 grounded through 0.01 F and 1
,
0.8
1.0
Vrms
pin 1 = high: the pin 3 noise in input equivalent*1
Second harmonic distortion CH1
2THD1
Pin 20 input = 100 Vp-p, f = 1.5 MHz, pin 1 = low:
–50
–40
dB
the second harmonic in the pin 3 output
Second harmonic distortion CH2
2THD2
Pin 17 input = 100 Vp-p, f = 1.5 MHz, pin 1 = high:
–50
–40
dB
the second harmonic in the pin 3 output
Maximum output voltage CH1
VOMP1
With the pin 20 input varying, f = 1.5 MHz, pin 1 = low:
2.0
Vp-p
when the pin 3 third harmonic distortion is –30 dB
Maximum output voltage CH2
VOMP2
With the pin 17 input varying, f = 1.5 MHz, pin 1 = high:
2.0
Vp-p
when the pin 3 third harmonic distortion is –30 dB
Pin 17 and 20 inputs = 0, pin 1 = low, pin 2 = low (SP):
Output DC offset 1
V
ODC1
the difference in the pin 3 DC level when pin 1 goes
–30
0
+30
mV
from low to high
Pin 17 and 20 inputs = 0, pin 1 = low, pin 2 = high (EP):
Output DC offset 2
V
ODC2
the difference in the pin 3 DC level when pin 1 goes
–50
0
+50
mV
from low to high
Head switching: CH1 hold voltage
VHS1
The pin 1 DC voltage required to operate CH1
0
1.0
V
Head switching: CH2 hold voltage
VHS2
The pin 1 DC voltage required to operate CH2
3.0
VCC
V
Playback mode switch
RSW
Calculate from the voltage difference on pin 16
4.0
6.0
on resistance
when the pin 16 influx current is 1 mA and 2 mA.
SP hold voltage
V2SP
The pin 2 voltage required to hold SP mode
0
1.0
V
EP hold voltage
V2EP
The pin 2 voltage required to hold EP mode
3.0
VCC
V
PB hold voltage
V5L
The pin 5 voltage required to hold PB mode
0
1.0
V
[Record Mode]
Circuit current
ICCR
No signal, the pin 14 influx current
45
63
81
mA
Output current
IOR
Pin 9 input = 180 mVp-p, f = 1.5 MHz:
48
53
58
mAp-p
measure the pin 16 output
AGC control characteristics 1
V
AGC1
Pin 9 input = 90 and 180 mVp-p, f = 1.5 MHz:
–0.5
–0.2
dB
the ratio of the pin 16 output levels
AGC control characteristics 2
V
AGC2
Pin 9 input = 360 and 180 mVp-p, f = 1.5 MHz:
0.2
0.5
dB
the ratio of the pin 16 output levels
Cross modulation distortion
CMD04
For a pin 9 input*2, the 0.4 MHz spurious signal
–40
dB
0.4 MHz component
in the pin 16 output current
Cross modulation distortion
CMD09
For a pin 9 input*2, the 0.9 MHz spurious signal
–40
dB
0.9 MHz component
in the pin 16 output current
Continued on next page.
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