ISL6422B Datasheet, PDF (8/18 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

Tone Waveform
ENT1, ENT2
I²C
MSEL1, MSEL2
I²C
ISL6422B
EXTM1, EXTM2
PIN
VOUT1, VOUT2
PIN
22kHz
22kHz
INTERNAL TONE
t_r = 10µs TYP
22kHz
22kHz
22kHz
22kHz
EXTERNAL TONE
t_r = 10µs TYP
RETURNS TO NOMINAL VOUT ~1 PERIOD
AFTER THE LAST EXTM RISING EDGE
t >55µs
FIGURE 1. TONE WAVEFORM
INTERNAL TONE
t_r = 10µs TYP
NOTES:
10. The logic presented to the signal pin TXT1, TXT2 changes the decoder threshold during tone Transmit and Receive. TTH1, TTH2 allows
threshold control through the I²C provided that TXT1, TXT2 = 0
11. The tone rise and fall times are not shown due to resolution of graphics. It is 10µs typ for 22kHz.
12. The EXTM1, EXTM2 pins have input thresholds of V_IL(max) = 0.8V and V_IH(min) = 1.7V
Typical Performance Curves
0.8
0.7
0.6
I_OUT__max
0.5
0.4
0.3
0.2
0.1
0.0
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 2. OUTPUT CURRENT DERATING (EPTSSOP)
NOTE: With both channels in simultaneous operation at rated output
0.8
0.7
0.6
I_OUT__max
0.5
0.4
0.3
0.2
0.1
0.0
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 3. OUTPUT CURRENT DERATING (6x6 QFN)
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FN6486.1
August 10, 2007