TLC7528C, TLC7528E, TLC7528I

DUAL 8BIT MULTIPLYING

DIGITALTOANALOG CONVERTERS

SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008

7

POST OFFICE BOX 655303

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 Figure 3 and Figure 4. Table 1 and Table 2 summarize

input coding for unipolar and bipolar operation, respectively.

DGND

VOB

VOA

VI(B)

±10 V

R3 (see Note A)

R1 (see Note A)

AGND

C1

(see Note B)

C2

(see Note B)

R2 (see Note A)

R4 (see Note A)

AGND

OUTB

RFBB

AGND

OUTA

5

VDD

17

7

14

DACA / DACB

DB0

DB7

Input

Buffer

8

8

8

8

REFB

RFBA

REFA

Latch

Control

Logic

CS

WR

16

15

6

RECOMMENDED TRIM

RESISTOR VALUES

R1, R3

R2, R4

500

Ω

150

Ω

DACA

DACB

Latch

VI(A)

±10 V

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 (10pF to 15pF) are required when using high-speed amplifiers to prevent ringing or

oscillation.

Figure 3. Unipolar Operation (2-Quadrant Multiplication)