SPT5240
DATA SHEET
Analog Outputs
The SPT5240 provides differential current outputs which
provide an output level based on the value of R
35
30
25
20
15
10
5
RSET Steps = 2.75kΩ
at
SET
maximum output code (see Figure 3). The required value of
may be calculated using the formulas:
R
SET
LSB = I /1023
FS
Then:
R
1.111 – (1000 • LSB)
SET
=
0
4 • LSB
60.3
11.2
RSET Value (kΩ)
Where I is the desired full-scale current output.
FS
Figure 3: R
vs. I
OUT
SET
Each output requires a minimum 5Ω load to analog ground.
The typical circuit utilizes 50Ω loads to develop voltage for
the output transformer (refer to EB5240 data sheet).
Table 1: Input Data Format
Input Code D9 – D0
Analog Output
IO
IO
N
P
0000000000
1111111111
F
S
0
0
F
S
Sleep XXXXXXXXXX
0
0
X indicates either data state.
Package Dimensions
LQFP-32
A
B
INCHES
MILLIMETERS
G
H
Symbol
Min
Max
Min
Max
9.20
7.10
9.20
7.10
A
B
C
D
E
F
G
H
I
0.346
0.362
0.280
0.362
0.280
8.80
6.90
8.80
6.90
0.272
0.346
0.272
0.031 Typ
0.80 BSC
0.012
0.053
0.002
0.037
0.016
0.057
0.006
0.041
0.007
7°
0.30
1.35
0.05
0.95
0.40
1.45
0.15
1.05
0.17
7°
C
D
J
K
L
0°
0°
I
0.020
0.030
0.50
0.75
J
E
F
K
L
REV. 1 June 2003
9
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
