TLC7628C_16 Datasheet, PDF (7/18 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTER

A8−A15
VMA
CPU
6800
φ2
TLC7628C
DUAL 8ĆBIT MULTIPLYING
SLAS063B − APRIL 1989 − REVISED MARCH 2007
APPLICATION INFORMATION
Address Bus
Address
Decoder
Logic
A
A+1
DACA/DACB
CS
TLC7628
WR
DB0
DB7
D0 −D7
Data Bus
NOTE D: A = decoded address for TLC7628 DACA
A + 1 = decoded address for TLC7628 DACB
Figure 5. TLC7628 − 6800 Interface
voltage-mode operation
The current-multiplying DAC in the TLC7628C can be operated in a voltage mode. In the voltage mode, a fixed
voltage is placed on the current output terminal. The analog output voltage is then available at the reference
voltage terminal. An example of a current-multiplying DAC operating in voltage mode is shown in Figure 6. The
relationship between the fixed input voltage and the analog output voltage is given by the following equation:
Analog output voltage = fixed input voltage (D/256)
where D = the digital input. In voltage-mode operation, these devices meet the following specification:
LINEARITY ERROR
Analog output voltage for REFA, REFB
R
REF
(Analog output voltage)
R
2R
TEST CONDITIONS
VDD = 12 V, OUTA or OUTB at 5 V, TA = 25°C
R
MIN MAX UNIT
1 LSB
2R
2R
2R
R
“0”
“1”
OUT (Fixed input voltage)
AGND
Figure 6. Current-Multiplying DAC Operating in Voltage Mode
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