TLC7628C_16 Datasheet, PDF (5/18 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTER

TLC7628C
DUAL 8ĆBIT MULTIPLYING
SLAS063B − APRIL 1989 − REVISED MARCH 2007
APPLICATION INFORMATION
This device is 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
5
DGND
Control
Logic
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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