TLC7528C_15 Datasheet, PDF (8/28 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
VI(A)
± 10 V
R6
20 kΩ
(see Note B)
VDD ¹⁷
ÎÎÎÎ _{DB0 14}
ÎÎÎÎÎÎÎÎ _DB7
ÎÎÎÎ ⁷
Input
Buffer
DACA/ ⁶
DACB
CS ¹⁵
WR ¹⁶
5
ÎÎÎÎ _Control
ÎÎÎÎÎÎÎÎ Logic
DGND
R1
(see Note A)
RFBA
ÎÎÎ ⁸
8
OUTA
ÎÎÎ ^Latch
DACA
RFBB
8
8
ÎÎÎÎÎÎ _Latch
OUTB
DACB
AGND
REFB
R3
(see Note A)
R2 (see Note A)
AGND
C1
(see Note C)
A1
R7
10 kΩ
(see Note B)
R4 (see Note A)
C2
(see Note C)
R11
5 kΩ
R5
20 kΩ
−
A2
+
R8
20 kΩ
A3
AGND
R9
10 kΩ
(see Note B)
A4
R11
5 kΩ
AGND
VOA
VOB
VI(B)
± 10 V
R10
20 kΩ
(see Note B)
NOTES: A. R1, R2, R3, and R4 are used only if gain adjustment is required. See table in Figure 3 for recommended values. Adjust R1 for
VOA = 0V with code 10000000 in DACA latch. Adjust R3 for VOB = 0V with 10000000 in DACB latch.
B. Matching and tracking are essential for resistor pairs R6, R7, R9, and R10.
C. C1 and C2 phase compensation capacitors (10pF to 15pF) may be required if A1 and A3 are high-speed amplifiers.
Figure 4. Bipolar Operation (4-Quadrant Operation)
Table 1. Unipolar Binary Code
DAC LATCH CONTENTS
MSB
LSB^†
ANALOG OUTPUT
11111111
10000001
10000000
01111111
00000001
00000000
† _{1LSB = (2−8)VI}
−VI (255/256)
−VI (129/256)
−VI (128/256) = − Vi/2
−VI (127/256)
−VI (1/256)
−VI (0/256) = 0
Table 2. Bipolar (Offset Binary) Code
DAC LATCH CONTENTS
MSB
LSB^‡
ANALOG OUTPUT
11111111
10000001
10000000
01111111
00000001
00000000
‡ _{1LSB = (2−7)VI}
VI (127/128)
VI (1/128)
0V
−VI (1/128)
−VI (127/128)
−VI (128/128)
8
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