TLC7528C Datasheet, PDF (11/17 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

Test Input
0 to –Vref
8
Data Inputs
Vref
TLC7528C, TLC7528E, TLC7528I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS062B – JANUARY 1987 – REVISED MARCH 2000
APPLICATION INFORMATION
3
RFBA
VDD
17
4
REFA
DACA
OUTA 2
14 – 7
DB0 – DB7
TLC7528
15
1
CS
AGND
16
WR
6
DACA / DACB
OUTB
20
18 _REFB
DACB
5
DGND
RFBB
19
VCC
1 kΩ
PASS / FAIL Output
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 log10 D/256, D = digital input code
17
RFBA 3
VDD
OUTA 2
VIA
4 REFA _DACA
A1
Output
VOB
14 – 7
8
DB0 – DB7
TLC7528
15
CS
16
WR
20 OUTB
6
DACA / DACB
A2
DACB
REFB 18
1
AGND
RFBB
5
DGND
19
Figure 9. Digitally Controlled Dual Telephone Attenuator
Data Bus
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11