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CXD3068Q
§ 5-3. DC Offset Cancel [AVRG (Average) Measurement and Compensation] (See Fig. 5-3.)
The CXD3068Q can measure the average of RFDC, VC, FE and TE and compensate these signals using the
measurement results to control the servo effectively. This AVRG measurement and compensation is
necessary to initialize the CXD3068Q, and is able to cancel the DC offset.
AVRG measurement takes the levels applied to the VC, FE, RFDC and TE pins as the digital average of 256
samples, and then loads these values into each AVRG register.
The AVRG measurement commands are D15 (VCLM), D13 (FLM), D11 (RFLM) and D4 (TLM) of $38.
Measurement is on when the respective command is set to 1.
AVRG measurement requires approximately 2.9ms to 5.8ms (when MCK = 128Fs) after the command is received.
The completion of AVRG measurement operation can be monitored by the SENS pin. (See Timing Chart 5-2.)
Monitoring requires that the upper 8 bits of the command register are 38 (Hex).
Timing Chart 5-2.
<Measurement>
VC AVRG: The VC DC offset (VC AVRG) which is the center voltage for the system is measured and used to
compensate the FE, TE and SE signals.
FE AVRG: The FE DC offset (FE AVRG) is measured and used to compensate the FE and FZC signals.
TE AVRG: The TE DC offset (TE AVRG) is measured and used to compensate the TE and SE signals.
RF AVRG: The RF DC offset (RF AVRG) is measured and used to compensate the RFDC signal.
<Compensation>
RFLC:
(RF signal – RF AVRG) is input to the RF In register.
"00" is input when the RF signal is lower than RF AVRG.
TLC0:
(TE signal – VC AVRG) is input to the TRK In register.
TLC1:
(TE signal – TE AVRG) is input to the TRK In register.
VCLC:
(FE signal – VC AVRG) is input to the FCS In register.
FLC1:
(FE signal – FE AVRG) is input to the FCS In register.
FLC0:
(FE signal – FE AVRG) is input to the FZC register.
Two methods of canceling the DC offset are assumed for the CXD3068Q. These methods are shown in Figs.
5-3a and 5-3b.
An example of AVRG measurement and compensation commands is shown below.
$38 08 00
(RF AVRG measurement)
$38 20 00
(FE AVRG measurement)
$38 00 10
(TE AVRG measurement)
$38 14 0A
(Compensation on [RFLC, FLC0, FLC1, TLC1], corresponds to Fig. 5-3a.)
See the description of $38 for these commands.
Содержание PV420S
Страница 1: ...SERVICE MANUAL PV420S WWW BBK RU ...
Страница 72: ... 69 CXD3068Q Block Diagram ...
Страница 73: ... 70 CXD3068Q Pin Configuration ...
Страница 122: ... 119 CXD3068Q Timing Chart 1 3 ...
Страница 123: ... 120 CXD3068Q Timing Chart 1 4 ...
Страница 124: ... 121 CXD3068Q Timing Chart 1 5 ...
Страница 127: ... 124 CXD3068Q Timing Chart 1 16 CAV W mode EPWM 1 LPWR 0 Timing Chart 1 17 CAV W mode EPWM LPWR 1 ...
Страница 129: ... 126 CXD3068Q Timing Chart 2 1 ...
Страница 130: ... 127 CXD3068Q Block Diagram 2 2 ...
Страница 131: ... 128 CXD3068Q Timing Chart 2 3 ...
Страница 134: ... 131 CXD3068Q Timing Chart 2 6 ...
Страница 137: ... 134 CXD3068Q Fig 3 1 Disc Stop to Regular Playback in CLV W Mode CLV W Mode Fig 3 2 CLV W Mode Flow Chart ...
Страница 138: ... 135 CXD3068Q VCO C Mode Fig 3 3 Access Flow Chart Using VCO Control ...
Страница 140: ... 137 CXD3068Q Block Diagram 4 1 ...
Страница 143: ... 140 CXD3068Q Timing Chart 4 4 ...
Страница 147: ... 144 CXD3068Q Fig 4 6 a Auto Focus Flow Chart Fig 4 6 b Auto Focus Timing Chart ...
Страница 148: ... 145 CXD3068Q Fig 4 7 a 1 Track Jump Flow Chart Fig 4 7 b 1 Track Jump Timing Chart ...
Страница 149: ... 146 CXD3068Q Fig 4 8 a 10 Track Jump Flow Chart Fig 4 8 b 10 Track Jump Timing Chart ...
Страница 150: ... 147 CXD3068Q Fig 4 9 a 2N Track Jump Flow Chart Fig 4 9 b 2N Track Jump Timing Chart ...
Страница 151: ... 148 CXD3068Q Fig 4 10 a Fine Search Flow Chart Fig 4 10 b Fine Search Timing Chart ...
Страница 152: ... 149 CXD3068Q Fig 4 11 a M Track Move Flow Chart Fig 4 11 b M Track Move Timing Chart ...
Страница 157: ... 154 CXD3068Q Fig 4 15 CD TEXT Data Timing Chart ...
Страница 162: ... 159 CXD3068Q Fig 5 3a Fig 5 3b ...
Страница 176: ... 173 CXD3068Q Fig 5 26a Servo HighBooster Characteristics FCS TRK MCK 128Fs HBST1 0 HBST1 1 HBST0 0 HBST1 1 HBST0 1 ...
Страница 177: ... 174 CXD3068Q Fig 5 26b Servo LowBooster1 Characteristics FCS TRK MCK 128Fs LB1S1 0 LB1S1 1 LB1S0 0 LB1S1 1 LB1S0 1 ...
Страница 178: ... 175 CXD3068Q Fig 5 26c Servo LowBooster2 Characteristics FCS TRK MCK 128Fs LB2S1 0 LB2S1 1 LB2S0 0 LB2S1 1 LB2S0 1 ...
Страница 196: ... 193 CXD3068Q Description of Data Readout ...
Страница 200: ... 197 CXD3068Q ...
Страница 201: ... 198 CXD3068Q ...
Страница 202: ... 199 CXD3068Q ...
Страница 203: ... 200 CXD3068Q SLD Servo fs 345Hz Note Set the MSB bit of the K02 and K04 coefficients to 0 HPTZC Auto Gain fs 88 2kHz ...
Страница 207: ... 204 CXD3068Q Package Outline Unit mm ...
Страница 208: ...This data sheet has been made from recycled paper to help protect the environment 205 ...