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參數(shù)資料
| 型號(hào)： | TDA7420 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 14 MM, TQFP-64 |
| 文件頁(yè)數(shù)： | 4/29頁(yè) |
| 文件大小： | 230K |
| 代理商： | TDA7420 |
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SUB ADDRESS
LSB
MSB
LSB
MSB
LSB
MSB
VPEAK
(V)
D94AU188
20
DEVIATION(KHz)
0.9
1.2
2.0
2.8
DETECTOR OFF (00)
32.5
45
75
OVM=01
OVM=10
OVM=11
Figure 4: Behaviour of the Deviation Dependent Threshold Adjust (Over Deviation Detector)
I
2C BUS INTERFACE
Interface Protocol
The interface protocol comprises:
A start condition (s)
A chip address byte, (the LSB bit determines
read/write transmission).
A subaddress byte
A sequence of data (N-bytes + acknowledge)
A stop condition (P)
S
1
00010
0 R/W ACK X
X
T
I
A3 A2 A1 A0 ACK
DATA
ACK P
ACK = Acknowledge
S = Start
P = Stop
I = Autoincrement
MAX CLOCK SPEED 500kbits/s
Autoincrement
If bit I in the subaddress byte is set to ”1”, the autoincrement of subaddress is enabled.
CHIP ADDRESS
DATA 1...DATA n
2.4V(11)
TRIG. THRESHOLD
0.9V
VPEAK
E’
D94AU187B
1.9V(10)
1.3V(01)
MONO
STEREO
noisy signal
good signal
ATC_SB OFF (00)
NOISE
3G
Figure 3: Behaviour of the Field Strength Controlled Threshold Adjustment
TDA7420
12/29
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