TLC7628C, TLC7628E, TLC7628I

DUAL 8-BIT MULTIPLYING

DIGITAL-TO-ANALOG CONVERTERS

SLAS063A – APRIL 1989 – REVISED MAY 1995

5

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 Figures 2 and 3. Input coding for unipolar and bipolar

operation are summarized in Tables 2 and 3, respectively.

17

DGND

5

16

15

6

7

14

VDD

Input

Buffer

Control

Logic

WR

CS

DACB

DACA/

DB7

DBO

VI(B)

±10 V

R3 (see Note A)

REFB

8

8

88

REFA

RFBA

OUTA

AGND

AGND

OUTB

RFBB

C1 (see Note B)

A1

R4 (see Note A)

C2 (see Note B)

AGND

A3

VOA

R2 (see Note A)

R1 (see Note A)

±10 V

VI(A)

VOB

RECOMMENDED TRIM

RESISTOR VALUES

R1, R3

R2, R4

500

Ω

150

Ω

Latch

DACA

Latch

DACB

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 2. Unipolar Operation (2-Quadrant Multiplication)