LTC2751-14 Linear Technology Corporation, LTC2751-14 Datasheet - Page 12

• Manufacturer Part Number: LTC2751-14
• Description: Ltc2751-14 - Current Output 14-bit Softspan Dacs With Parallel I/o
• Manufacturer: Linear Technology Corporation

TIMING DIAGRAMS
LTC2751
Output Ranges
The LTC2751 is a current-output, parallel-input precision
multiplying DAC with software-programmable output
ranges. SoftSpan provides two unipolar output ranges
(0V to 5V and 0V to 10V), and four bipolar ranges (±2.5V,
±5V, ±10V and –2.5V to 7.5V). These ranges are obtained
when an external precision 5V reference is used. When
a reference voltage of 2V is used, the SoftSpan ranges
become: 0V to 2V, 0V to 4V, ±1V, ±2V, ±4V and –1V to
3V. The output ranges are linearly scaled for references
other than 2V and 5V.
12
OPERATION
OUTPUT
INPUT
INPUT
READ
UPD
CLR
UPD
WR
D/S
WR
D/S
I/O
I/O
I/O
t
7
t
13
t
t
18
23
t
5
t
19
Write, Update and Clear Timing
t
15
t
3
t
1
Readback Timing
t
6
t
t
2
8
Digital Section
The LTC2751 family has four internal interface registers
(see Block Diagram). Two of these—one input and one
DAC register—are dedicated to the data I/O port, and two
to the span I/O port. Each port is thus double-buffered. The
double-buffered feature provides the capability to simulta-
neously update the span and code, which allows smooth
voltage transitions when changing output ranges. It also
permits the simultaneous updating of multiple DACs.
t
17
t
4
t
20
t
22
t
t
14
24
t
25
2751 TD01
2751 TD02
2751f