TLFD500 Datasheet, PDF (28/38 Pages) Texas Instruments – 3.3 V INTEGRATED G.LITE ANALOG FRONT END

TLFD500PN
3.3 V INTEGRATED G.LITE ANALOG FRONT END
SLAS207B – JUNE 1999 – REVISED MAY 2000
DPLL detailed description (continued)
To prevent variation in the serial clock width (SCLK) due to jitter, the serial clock is modified to have a fixed high
level of 14 ns and a low level of 7 ns, thus resulting in a period of 21 ns. The average clock frequency is still
35.328 MHz. After the 16 SCLKs are complete, the clock goes quiet (no toggle zone) until the rising edge of
the next ADCLK. The length of the no-toggle zone varies with the ADCLK. Figure 9 illustrates an example.
SCLK
35.328 MHz
14 ns
7 ns
ADCLK
2.208 MHz
1/35.328 MHz
DACLK
4.416 MHz
Figure 9. Relation of SCLK With ADCLK/DACLK in DPLL Mode
absolute maximum ratings over operating free-air temperature (unless otherwise noted)^†
Supply voltage, AVDD to AGND, DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 4.5 V
Analog input voltage range to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to AVDD+0.3 V
Digital input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to DVDD+0.3 V
Operating virtual junction temperature range, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 150°C
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C
Storage temperature range, T_str . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250°C
† _{Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and}
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
power supply
Supply voltage
AVDD_RX, AVDD_TX, AVDD_REF
DVDD, DVDD_IO, DVDD_RX
digital inputs
High-level input voltage, VIH
Low-level input voltage, VIL
analog input
Digital power supply = 3.3 V
AVDD_RX = 3.3 V, The input signal is measured single ended.
Analog input signal range
AVDD_RX = 3.3 V, The input signal is measured differentially.
MIN NOM MAX UNIT
3 3.3 3.6
V
3 3.3 3.6
MIN NOM MAX UNIT
2.4
V
0.6
MIN
NOM
AVDD_RX/2±0.75
3
MAX
UNIT
V
Vp-p
28
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