Rainbow Electronics MAX5480 - Manual (Page 5)

MAX5480
8-Bit Parallel DAC in
QSOP-16 Package
_______________________________________________________________________________________ 5
INTERFACE LOGIC
S7 S6 S1
20k Ω 20k Ω 20k Ω 20k Ω
10k Ω
S8
D6 D5 D0 (LSB) D7 (MSB)
20k Ω
10k Ω
REF
10k Ω
10k Ω
OUT2
CS
OUT1
RFB
WR
Figure 3. MAX5480 Functional Diagram
t CH t CS
0
V DD
0
V DD
0
NOTES:
1. FOR THE MAX5480, ALL INPUT SIGNAL RISE AND FALL TIMES ARE MEASURED
FROM 10% TO 90% OF V
DD . V DD = +5V, t r = t f = 20ns.
2. TIMING MEASUREMENT REFERENCE LEVEL IS (V IH + V IL ) / 2.
CS
WR
DATA IN
(D7–D0)
DATA IN
STABLE
V DD
t
WR
t
DS
V
IH
V IL
t DH
Figure 4. Write-Cycle Timing Diagram
Table 2. Unipolar Binary Code Table Table 3. Bipolar (Offset Binary) Code Table
NOTE LSB V V
REF REF
: 1 2
1
256
8 =  
( )
=
( )
−
NOTE LSB V V
REF REF
: 1 2
1
128
7 =  
( )
=
( )
−
DIGITAL INPUT
MSB LSB
1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 1
ANALOG OUTPUT
1 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0
DIGITAL INPUT
MSB LSB
1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 1
ANALOG OUTPUT
1 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0
-V
255
256
REF

 

-V
129
256
REF

 

-V
128
256
REF

 

= −
V
REF
2
-V
127
256
REF

 

-V
1
256
REF

 

-V
0
256
REF

 

=
0
+V
127
128
REF

 

+V
1
128
REF

 

-V
1
128
REF

 

-V
127
128
REF

 

-V
128
128
REF

 

0