ISL5929 Intersil Corporation, ISL5929 Datasheet - Page 12

• Manufacturer Part Number: ISL5929
• Description: CommLink TM High Speed D/A Converter
• Manufacturer: Intersil Corporation

R
performance of Figure 13 and Figure 14 is basically the
same, however leaving the center tap of Figure 14 floating
allows the circuit to find a more balanced virtual ground,
theoretically improving the even order harmonic rejection,
but likely reducing the signal swing available due to the
output voltage compliance range limitations.
Timing Diagram
A
FIGURE 13. OUTPUT LOADING FOR DATASHEET
R
ISL5929
=R
EQ
AT EACH OUTPUT
B
= 0.5 x (R
=50Ω, R
D13-D0
MEASUREMENTS
LOAD
I
CLK
OUT
DIFF
FIGURE 15. PROPAGATION DELAY, SETUP TIME, HOLD TIME AND MINIMUM PULSE WIDTH DIAGRAM
OUTB
OUTA
// R
=100Ω, assuming R
DIFF
R
LOAD SEEN BY THE TRANSFORMER
LOAD
R
)
DIFF
REPRESENTS THE
12
t
SU
V
W
OUT
0
1:1
= (2 x OUTA x R
LOAD
t
PW1
=50Ω. The
t
HLD
t
PD
OUTPUT=W
R
LOAD
EQ
t
)V
PW2
t
SU
ISL5929
W
1
-1
Propagation Delay
The converter requires two clock rising edges for data to be
represented at the output. Each rising edge of the clock
captures the present data word and outputs the previous
data. The propagation delay is therefore 1/CLK, plus <2ns of
processing. See Figure 15.
Test Service
Intersil offers customer-specific testing of CommLink
converters with a service called Testdrive. To submit a
request, fill out the Testdrive form at
www.intersil.com/testdrive. Or, send a request to the
technical support center.
t
R
HLD
ISL5929
EQ
t
PD
= 0.5 x (R
AT EACH OUTPUT
OUTPUT=W
FIGURE 14. ALTERNATIVE OUTPUT LOADING
t
SU
LOAD
W
2
0
OUTA
OUTB
// R
DIFF
// R
R
R
LOAD SEEN BY THE TRANSFORMER
t
DIFF
HLD
LOAD
R
R
A
B
), WHERE R
A
OUTPUT=W
REPRESENTS THE
V
OUT
A
W
=R
= (2 x OUTA x R
1
3
B
50%
R
LOAD
EQ
)V