Datasheet

  
  
 
SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
REFB
19
RFBB
OUTB
AGND
TLC7528
REFA
DB0−DB7
CS
WR
DACA
/DACB
DGND
V
ref
Data Inputs
4
5
18
6
16
15
14−7
Test Input
0 to −V
ref
RFBA
3
V
DD
17
OUTA 2
1
20
PASS/FAIL
Output
1 kΩ
V
CC
+
−
+
−
DACB
DACA
8
Figure 8. Digitally-Programmable Window Comparator (Upper- and Lower-Limit Tester)
digitally-controlled signal attenuator
Figure 9 shows a TLC7528 configured as a two-channel programmable attenuator. Applications include stereo
audio and telephone signal level control. Table 3 shows input codes vs attenuation for a 0dB to 15.5dB range.
OutputA1
A2
V
O
B
V
DD
TLC7528
DGND
AGND
REFB
DACA
/DACB
WR
CS
DB0−DB7
OUTA
RFBA
REFA
RFBB
OUTB
Data Bus
3
2
15
16
6
18
1
5
19
17
4
20
DACA
DACB
Attenuation dB = −20 log
10
D/256, D = digital input code
8
14−7
V
I
A
Figure 9. Digitally Controlled Dual Telephone Attenuator