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參數(shù)資料
| 型號： | TZA1047HL/M3 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.4 MM HEIGHT, PLASTIC, MS-026, SOT314-2, LQFP-64 |
| 文件頁數(shù)： | 17/69頁 |
| 文件大?。?/td> | 324K |
| 代理商： | TZA1047HL/M3 |
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9397 750 14664
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 1 June 2005
24 of 69
Philips Semiconductors
TZA1047
Preprocessor IC for CD and DVD rewritable
The input circuit is designed to present a low-ohmic, appropriate characteristic termination
to the PCB tracks. To limit EMI, the voltage swing on the PCB track can be kept small by
series resistors placed close to, or inside, the driver IC.
In internal mode, the driving EFMclock and EFMdata signals are supplied as
complementary signals. The inputs of EFMTIM on the TZA1047 act as current
comparators:
efmdp = 1 if ITH2/EDP > ITH1/EDN; efmcp = 1 if IRS/ECP > IREF/ECN
In external mode, the input signals are single-ended. The input circuit operates in the
same manner as in internal mode, as a current comparator. A reference current equal to
half the maximum input current is supplied to pin EFMREF to provide a threshold value:
RS = 1 if IRS/ECP > IREF/ECN; TH1 = 1 if ITH1/EDN > IREF/ECN etc.
Note that for the same input slew rate, the resistor values in external mode should be half
the value in internal mode.
To ensure good signal integrity, the currents through the series resistors must not be too
low. The maximum allowable input current for TZA1047 is larger than 5 mA. Using higher
value resistors will reduce power dissipation and will also reduce speed.
7.10.2 Signal generation in internal mode
In the following, the EFM clock and data signals that are routed to the input circuit in
current mode, are represented by the symbols efmc and efmd.
7.10.2.1
r/w signal
The r/w signal selects the read or write mode and can be produced either automatically or
it can be forced externally. In internal mode (bit EFMON = 1, bit FR = 0 and bit FW = 0)
signal r/w is derived from the EFM input signals as shown in Figure 12.
Fig 11. EFMTIM input signal connections.
70
R
EFMD,
EFMC
PCB or
driver IC
EFMINT = 1
EFMINT = 0
driver IC
TZA1047
R
1
70
efmdp, efmcp,
efmdn, efmcn
70
R
PCB or
driver IC
REF/ECN
driver IC
RS,
TH1,
TH2,
TZA1047
2
× R
1
70
001aab197
N.C.
RS,
TH1,
TH2
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