I7110 Datasheet, PDF (10/17 Pages) List of Unclassifed Manufacturers – 300 Mbps LED Drivers

i7110
4.6 Detail Description
The i7110 provides a flexible current drive for the
modulation of the light-emitting diodes(LEDS).
The circuit is designed to use 3.3V ~ 5V power
supply. The IC provides up to 120mA of
modulation current.
Figure-11 shows a typical block diagram of
i7110, which comprises a bandgap, current
modulation block, peaking and clamping block,
an input buffer, pulse width adjustment function
block and the output driver.
Reference-Voltage Generate
The reference-voltage generator circuit provides
single-ended input reference voltage VREF.
The VREF is used to simplify the PECL-
compatible input. For single-ended operation,
connect the input signal to DINP, and connect
DINN directly to VREF. The VREF circuit is not
designed to drive other external circuitry.
LED Drive and Temperature Compensation
The two resistors RRSET1 and RRSET2 set the
LED drive current and temperature compensation.
The simplified application diagram (Figure-11)
shows RRSET1 connects between RSET1 and
GND, and RRSET2 connects between RSET1
and RSET2.
PWAP PWAN
GND
GND
D ISA
D IN P
D IN N
VREF
RSET2
RRSET2
RRSET1
Page 8
Input
B u ffe r
P ulse
w idth
A djust
D river
Bandgap
C u rre n t
M odulation
P eaking &
C lam ping
IO U TB
IO U T
RPEAK
CPEAK
PEAK
RSET1 VDDA VDDD VDDC
Figure-11
© 2005 iCreate Technologies Corporation
APD-8011-001