TLC7528C, TLC7528E, TLC7528I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS062B – JANUARY 1987 – REVISED MARCH 2000
APPLICATION INFORMATION
These devices are capable of performing 2-quadrant or full 4-quadrant multiplication. Circuit configurations for
2-quadrant and 4-quadrant multiplication are shown in Figures 3 and 4. Tables 1 and 2 summarize input coding
for unipolar and bipolar operation.
VI(A)
±
10 V
R1 (see Note A)
RFBA
VDD
14
DB0
DB7
7
17
REFA
Input
Buffer
8
Latch
OUTA
8
R2 (see Note A)
C1
(see Note B)
–
VOA
R4 (see Note A)
C2
(see Note B)
–
VOB
AGND
+
+
7
DACA / DACB
6
15
Control
Logic
8
CS
16
WR
5
DGND
Latch
8
REFB
RECOMMENDED TRIM
RESISTOR VALUES
R1, R3
R2, R4
500
Ω
150
Ω
NOTES: A. R1, R2, R3, and R4 are used only if gain adjustment is required. See table for recommended values. Make gain adjustment with
digital input of 255.
B. C1 and C2 phase compensation capacitors (10 pF to 15 pF) are required when using high-speed amplifiers to prevent ringing or
oscillation.
Figure 3. Unipolar Operation (2-Quadrant Multiplication)
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
DACA
AGND
RFBB
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
DACB
VI(B)
±
10 V
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
OUTB
AGND
R3 (see Note A)
TI [ TEXAS INSTRUMENTS ]
