TLC7528C, TLC7528E, TLC7528I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS062B – JANUARY 1987 – REVISED MARCH 2000
APPLICATION INFORMATION
V
DD
V
CC
Test Input
0 to –V
3
17
ref
RFBA
1 kΩ
OUTA
2
–
+
4
14–7
15
DACA
REFA
8
Data Inputs
DB0–DB7
TLC7528
1
PASS/FAIL Output
CS
AGND
16
6
WR
DACA/DACB
OUTB
20
–
+
18
5
REFB
V
ref
DACB
DGND
RFBB
19
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 0 to 15.5 dB range.
Attenuation dB = –20 log D/256, D = digital input code
10
RFBA
OUTA
3
2
17
4
V
DD
REFA
V A
I
DACA
A1
8
Output
14–7
DB0–DB7
Data Bus
TLC7528
15
16
6
CS
WR
DACA/DACB
OUTB
RFBB
20
19
REFB 18
DACB
A2
V
O
B
1
AGND
5
DGND
Figure 9. Digitally Controlled Dual Telephone Attenuator
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
