Datasheet


  
SLAS063B − APRIL 1989 − REVISED MARCH 2007
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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.
17
DGND
5
16
15
6
7
14
V
DD
Input
Buffer
Control
Logic
WR
CS
DACB
DACA
/
DB7
DBO
V
I(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
V
OA
R2 (see Note A)
R1 (see Note A)
± 10 V
V
I(A)
+
−
+
−
V
OB
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)