TLC7628C Datasheet, PDF (5/10 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7628C, TLC7628E, TLC7628I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS063A – APRIL 1989 – REVISED MAY 1995
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.
VI(A)
± 10 V
VDD
17
14
DBO
7 ^DB7
Input
Buffer
R1 (see Note A)
RFBA ^{R2 (see Note A)}
REFA
8
8
OUTA
Latch
DACA _AGND
C1 (see Note B)
A1
VOA
DACA/
6 _DACB
15 _CS
16 _WR
Control
Logic
5
DGND
RFBB
R4 (see Note A)
8
8
Latch
OUTB
DACB
AGND
REFB
C2 (see Note B)
A3
VOB
RECOMMENDED TRIM
RESISTOR VALUES
R1, R3 500 Ω
R2, R4 150 Ω
R3 (see Note A)
VI(B)
± 10 V
AGND
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)
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