X9530_0511 Datasheet, PDF (2/28 Pages) Intersil Corporation – Temperature Compensated Laser Diode Controller

X9530
TYPICAL APPLICATION
GBIC / SFP / XFP Module
High Speed
Data Input
MOD_DEF₍₀₎
MOD_DEF₍₁₎
X9530
I₁ ^IMODSET
SDA
SCK
I₂ ^{IPINSET/IBIASSET}
Laser
Diode
Driver
Circuit
V_CC
LD
MPD
I_LD
I_MON
BLOCK DIAGRAM
VRef
VSense
Voltage
Reference
Mux
ADC
Mux
Temperature
Sensor
SDA
SCL
WP
A2, A1, A0
2-Wire
Interface
Look-up
Table 2
Mux
R2
DAC 2
I2
Look-up
Table 1
Mux
DAC 1
I1
R1
Control
& Status
General
Purpose
Memory
DEVICE DESCRIPTION
The X9530 combines two Programmable Current
Generators, and integrated EEPROM with Block
Lock™ protection, in one package. The
Programmable Current Generators are ideal for use in
fiber optic Modulation Current require temperature
control. The combination of the X9530 functionality
and Intersil’s Chip-Scale package lowers system cost,
increases reliability, and reduces board space
requirements.
Two on-chip Programmable Current Generators may
be independently programmed to either sink or source
current. The maximum current generated is
determined by using an externally connected
programming resistor, or by selecting one of three
predefined values. Both current generators have a
maximum output of ±1.6 mA, and may be controlled to
an absolute resolution of 0.39% (256 steps / 8 bit).
Both current generators may be driven using an on-
board temperature sensor, an external sensor, or
Control Registers. The internal temperature sensor
operates over a very broad temperature range (-40°C
to +100°C). The sensor output (internal or external)
drives a 6-bit A/D converter, whose output selects one
of 64 bytes from each nonvolatile look-up table (LUT).
The contents of the selected LUT row (8-bit wide)
drives the input of an 8-bit D/A converter, which
generates the output current.
All control and setup parameters of the X9530,
including the look-up tables, are programmable via the
2-wire serial port.
2
FN8211.1
November 11, 2005