LTC8143 Linear Technology Corporation, LTC8143 Datasheet - Page 6

• Manufacturer Part Number: LTC8143
• Description: Ltc8143 - Improved Industry Standard Serial 12-bit Multiplying Dacs
• Manufacturer: Linear Technology Corporation

LTC7543/LTC8143
TRUTH TABLES
Table 1. LTC7543/LTC8143 Input Register
TYPICAL APPLICATIONS
6
STB1 STB2 STB3 STB4
X
X
X
0
0
0
1
CONTROL INPUTS
X
X
X
0
0
0
1
X
X
X
1
1
1
0
X
X
X
0
0
0
1
Input Register Operation
(LTC8143: SRO Operation)
Serial Data Bit on SRI Loaded into Input
Register, MSB First
(LTC8143: Data Bit or SRI Appears on
SRO Pin After 12 Clocked Bits)
No Input Register Operation
(LTC8143: No SRO Operation)
FOR DAISY-CHAINING
P
TO NEXT DAC
–10V TO 10V
(LTC8143)
V
REF
0.1 F
U
1111
1000
0000
0000
MSB
BINARY NUMBER IN
5V
DIGITAL INPUT
DAC REGISTER
Unipolar Operation (2-Quadrant Multiplication)
10
11
4
7
5
6
9
8
STB3
STB1
SRI
LD1
SRO (LTC8143)
LD2
STB2
STB4
1111
0000
0000
0000
CLR
Unipolar Binary Code Table
13
1111
0000
0001
0000
DGND
LSB
V
DD
12
14
LTC7543
LTC8143
V
REF
15
AGND
R
– V
– V
– V
0V
FB
16
3
REF
REF
REF
Table 2. LTC7543/LTC8143 DAC Register
CONTROL INPUTS
ANALOG OUTPUT
CLR
OUT 1
OUT 2
0
1
1
1
(4095/4096)
(2048/4096) = – V
(1/4096)
V
LD1
2
OUT
1
X
X
1
0
LD2
X
X
1
0
33pF
REF
–
+
DAC Register Operation
Reset DAC Register to All 0s (Asynchronous
Operation; No Effect on Input Register)
No DAC Register Operation
Load DAC Register with the Contents of Input
Register
LT1097
/2
V
0V TO –V
7543/8143 TA03
OUT
REF