AN8725FH Datasheet, PDF (19/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

ICs for Optical Disk Drive
AN8725FH
s Electrical Characteristics at V_CC = 5.0 V, T_a = 25°C (continued)
• Design reference data (continued)
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min Typ Max Unit
Optical monitor for abnormally emitted light detection (continued)
Signal changeover response
× 5 mode
t_ERSW1B Playback → recording ±0.5%,
addr "9": D4 = "1" × 5
 200 400 ns
t_ERSW2B Recording → playback ±0.5%,
addr "9": D4 = "1" × 5
 250 500
Control operation response Register setting → output
Data writing to LPF-off
Data writing to LPF-on
Data writing to AAF-off
Data writing to AAF-on
Data writing to
DAC6 changeover ^*3
t₈₇ XWR ↑ to LPF "off"
t₈₈ XWR ↑ to LPF "on"
t₈₅ XWR ↑ to AAF "off"
t₈₆ XWR ↑ to AAF "on"
t₂₀₇ XWR ↑ to DAC6 ±0.5%
 0.8 2.0 µs
 250 600 ns
 60 200 ns
 20 200 ns
 0.9 2.5 µs
Data writing to
DAC5 changeover ^*3
t₂₀₈ XWR ↑ to DAC5 ±0.5%
 0.9 2.5 µs
Data writing to shunt on ^*4
t₈₉ XWR ↑ to shunt circuit "on",
LDERR register "1"
  430 ns
Data writing to shunt off ^*4
t₉₀ XWR ↑ to shunt circuit "off",
LDERR register "0"
  230 ns
Control operation response Input → output
RPHOLD ↑ to
PWRMONI changeover
t₃₇ RPHOLD ↑ to × 1,
at having reached ±0.5%
 0.4 0.9 µs
RPHOLD ↓ to
PWRMONI changeover
t₃₈ RPHOLD ↓ to × 10, AAF,
at having reached ±0.5%
 0.4 0.9 µs
RPHOLD ↑ to mask signal ^*5
Mask signal width at
RPHOLD ↑ ^*5
t₄₅ RPHOLD ↑ to mask signal ↓
t₄₆ Mask signal ↓ to mask signal ↑
at RPHOLD high
 15 30 ns
 1 1.1 µs
RPHOLD ↓ to mask signal ^*5
Mask signal width at
RPHOLD ↑ ^*5
t₄₇ RPHOLD ↓ to mask signal ↓
t₄₈ Mask signal ↓ to mask signal ↑
at RPHOLD low
 15 30 ns
 1 1.1 µs
RPHOLD ↓ to
AAFRST signal ↑ ^*5
t₂₁₁ RPHOLD ↓ to AAFRST ↑
 15 30 ns
AAFRST signal width ^*5
Shunt circuit "on" ^*6
Shunt circuit "off" ^*6
t₂₁₂ AAFRST ↑ to AAFRST ↓
t₄₉ XCLR ↓ to shunt circuit "on"
t₅₀ XCLR ↑ to shunt circuit "off"
 2 2.2 µs
  430 ns
  230 ns
Note) _*3: Measure at DACMONI pin.
*4: ^{Measuring is impossible outside the IC.}
*5: ^{Measuring is impossible outside the IC.}
The values of t₄₆, t₄₈ and t₂₁₂ are determined by the built-in resistor Rin1 (10 kΩ, allowance: 10%) and the external C1.
*6: ^{Measuring is impossible outside the IC. The built-in resistor Rin2 (10 kΩ, allowance: 10%) and the external C2.}
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