MAX520/MAX521
Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
_______________________________________________________________________________________ 5
Note 8: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 9: Cb = total capacitance of one bus line in pF. t
R
and t
f
measured between 0.3V
DD
and 0.7V
DD
.
Note 10: An input filter on the SDA and SCL input suppresses noise spikes less than 50ns.
Note 11: Guaranteed by design.
Hold Time, (Repeated) Start Condition t
HD, STA
0.6 µs
Low Period of the SCL Clock t
LOW
1.3 µs
High Period of the SCL Clock t
HIGH
0.6
PARAMETER SYMBOL MIN TYP MAX UNITS
Serial Clock Frequency f
SCL
0 400 kHz
Bus Free Time Between a STOP and a
START Condition
t
BUF
1.3 µs
CONDITIONS
µs
Setup Time for a Repeated START Condition t
SU, STA
0.6 µs
Data Hold Time t
HD, DAT
0 0.9 µs
Data Setup Time t
SU, DAT
100
(Note 8)
ns
Fall Time of SDA Transmitting (Note 6) t
F
20 + 0.1Cb 250 ns
Setup Time for STOP Condition t
SU, STO
0.6 µs
Capacitive Load for Each Bus Line Cb 400
I
SINK
≤ 6mA (Note 9)
pF
Rise Time of Both SDA and SCL Signals, Receiving t
R
20 + 0.1Cb 300 ns
Fall Time of Both SDA and SCL Signals, Receiving t
F
20 + 0.1Cb 300
(Note 9)
(Note 9) ns
Pulse Width of Spike Suppressed t
SP
050(Notes 10, 11) ns
TIMING CHARACTERISTICS
(V
DD
= 5V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
__________________________________________Typical Operating Characteristics
(V
DD
= 5V, DAC outputs unloaded, T
A
= +25°C, unless otherwise noted.)
10
9
0
-60 -30 30 90 120 150
MAX520
SUPPLY CURRENT vs. TEMPERATURE
2
1
8
7
MAX520/521-01
TEMPERATURE (°C)
I
DD
(µA)
060
6
5
4
3
OPERATING MODE OR
SHUTDOWN MODE
40
0
-60 -30 30 90 120 150
MAX520
REFERENCE INPUT CURRENT vs.
TEMPERATURE (SHUTDOWN MODE)
5
35
30
MAX520/521-02
TEMPERATURE (°C)
SHUTDOWN REFERENCE CURRENT (nA)
060
25
20
15
10
V
REF
= 4V
ONE REF INPUT DRIVEN
0
1k 100k10k 1M 10M
MAX520
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
-16
-18
MAX520/521-03
FREQUENCY (Hz)
RELATIVE OUTPUT (dB)
-14
-12
-10
-8
-6
-4
-2
2
V
DD
= 5V
V
REF
= 4Vp-p SINE WAVE
CENTERED AT 2.5V
