TLC7528C_15 Datasheet, PDF (7/28 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7528C, TLC7528E, TLC7528I
DUAL 8ĆBIT MULTIPLYING
DIGITALĆTOĆANALOG CONVERTERS
SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008
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.
VI(A)
± 10 V
VDD ¹⁷
DB0 ¹⁴
DB7
7
Input
Buffer
R1 (see Note A)
RFBA
R2 (see Note A)
8
ÎÎÎÎ _Latch
REFA
OUTA
8
DACA
ÎÎÎÎÎÎÎÎ_AGND
C1
(see Note B)
VOA
DACA / DACB ⁶
15
CS
WR ¹⁶
5
DGND
RFBB
R4 (see Note A)
Control
Logic
ÎÎÎ ÎÎÎÎ ₈
OUTB
8
ÎÎÎ ÎÎÎÎ _Latch
DACB
ÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ _REFB
AGND
C2
(see Note B)
AGND
VOB
RECOMMENDED TRIM
RESISTOR VALUES
R1, R3 500 Ω
R2, R4 150 Ω
R3 (see Note A)
VI(B)
± 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)
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