LTC1821-1BCGW#PBF Linear Technology, LTC1821-1BCGW#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC1821-1BCGW#PBF
• Description: IC D/A CONV 16BIT PRECISE 36SSOP
• Manufacturer: Linear Technology

Specifications of LTC1821-1BCGW#PBF

• Settling Time: 2µs
• Number Of Bits: 16
• Data Interface: Parallel
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -

APPLICATIONS
LTC1821
10
versatility of the interface also allows the use of the input
and DAC registers in a master slave or edge-triggered
configuration. This mode of operation occurs when WR
and LD are tied together. The asynchronous clear pin
resets the LTC1821 to zero scale and the LTC1821-1 to
midscale. CLR resets both the input and DAC registers.
These devices also have a power-on reset. Table 1 shows
the truth table for the LTC1821.
INPUTS
25 TO 36,
V
DATA
CLR
3 TO 6
WR
REF
LD
16
U
INFORMATION
WR
Figure 1. Unipolar Operation (2-Quadrant Multiplication) V
U
24
10
R1
LD
R1
23
LTC1821
CLR
9
R
W
COM
7
1111
1000
0000
0000
R2
MSB
DNC* DNC*
0.1 F
IN DAC REGISTER
BINARY NUMBER
DIGITAL INPUT
18
1111 1111 1111
0000 0000 0000
0000 0000 0001
0000 0000 0000
8
REF
Unipolar Binary Code Table
19
U
5V
V
DNC*
CC
2
21
LSB
R
11
R
NC
OFS
OFS
16-BIT DAC
22
–V
–V
–V
0V
REF
REF
REF
R
FB
DGND
ANALOG OUTPUT
Unipolar Mode
(2-Quadrant Multiplying, V
The LTC1821 can be used to provide 2-quadrant multiply-
ing operation as shown in Figure 1. With a fixed – 10V
reference, the circuit shown gives a precision unipolar 0V
to 10V output swing.
(65,535/65,536)
(32,768/65,536) = –V
(1/65,536)
1
R
12
V OUT
FB
AGNDF AGNDS
17
1821 F01
16
14
I
OUT
REF
–
+
/ 2
OUT
*DO NOT CONNECT
V
+
= 0V to – V
22pF
V
–
15
20
13
V
OUT
OUT
REF
= 0V to – V
0.1 F
0.1 F
15V
–15V
V
0V TO
–V
OUT
REF
=
REF
)