SML2108
PRELIMINARY
input to the ADC using bit 5 of Register 1, the converted BIASP (17, 18, 43, & 44)
valueofthecurrententeringthispinisusedastheaddress
High-side mean bias control current. Current source
outputrangeisprogrammable, withtheoptionalrangesof
0 to 100mA or 0 to 10mA.
of the EEPROM lookup table. In this configuration the
modulation current can be controlled by temperature
rather than the bias current. Refer to the application
example on using the EXT TEMP pin. If this option is not
used the pin should be left floating.
BIASN (27, 28, 33, & 34)
Low-side mean bias control current. Current sink input
range is 0 to 100mA.
VSSA, VSSD (13 & 14)
Analoganddigitallow-sidesuppliesforon-boardcircuitry.
Must be at same potential as all other VSS pins.
MODP (19, 20, 41, &42)
High-side modulation control current. Current source
outputrangeisprogrammable,withoptionalrangesof0to
100mA or 0 to 10mA.
V
DD (15, 16, 21, 22, 39, 40, 45, 46, & 47)
High-sidesupplyfortheBiasandModulationcurrentsand
power supply input for the chip.
MODN (25, 26, 35, &36)
Low-side modulation control current. Current sink input
range is 0 to 100mA.
CE# (48)
The chip enable input is active low and provides an
additional method of enabling the serial interface. The
stateofthispinhasnoeffectontheauto-monitorfunction.
This pin has an internal 100kΩ pullup.
SUMMIT MICROELECTRONICS, Inc.
2053 2.2 11/07/00
4
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
