LTC5100 datasheet(39/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 16. Register: IM_TC1—Laser Modulation Current First Order Temperature Coefficient (I2C Command Code 0x1A)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Im_tc1

First Order Temperature Coefficient for Modulation Current

This Bit Field is a Signed 8-Bit, Two’s Complement Integer. Thus its Value Ranges from –128 to 127.

Im_tc1 Sets the First Order Temperature Coefficient for the Modulation Current. The Nominal Scaling

is 2–13/

°C or 122ppm/°C per LSB.

Table 17. Register: IM_TC2—Laser Modulation Current Second Order Temperature Coefficient (I2C Command Code 0x1B)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Im_tc2

Second Order Temperature Coefficient for Modulation Current

This Bit Field is a Signed 8-Bit, Two’s Complement Integer. Thus its Value Ranges from –128 to 127.

Im_tc2 Sets the Second Order Temperature Coefficient for the Laser Bias Current. The Nominal

Scaling is 2–18/

°C2 or 3.81ppm/°C2 per LSB.

Table 18. Register: T_EXT—External Temperature (I2C Command Code 0x0D)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:10

.T_ext

Externally Supplied Temperature for Temperature Compensation Calculations (Unsigned 10-Bit

Integer)

By Convention the Scaling of T_ext is 512K or 239

°C Full Scale, Corresponding to 0.5°C/LSB.

However, Any Scaling is Permissible as Long as the Temperature Compensation Coefficients are Also

Appropriately Scaled.

T_ext = (T + 273

°C)/0.5°C, Where T is the External Temperature in Degrees Celsius.

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