Linear Technology LTC2756 18-Bit SoftSpan IOUT DAC with Serial SPI Interface Demo Board, req DC590B DC1792 DC1792 数据表
产品代码
DC1792
LTC2756
1
2756f
Typical applicaTion
FeaTures
applicaTions
DescripTion
Serial 18-Bit SoftSpan
I
OUT
DAC
The LTC
®
2756 is an 18-bit multiplying serial-input, cur-
rent-output digital-to-analog converter. LTC2756A provides
full 18-bit performance—INL and DNL of ±1LSB maxi-
mum—over temperature without any adjustments. 18-bit
monotonicity is guaranteed in all performance grades. This
SoftSpan™ DAC operates from a single 3V to 5V supply
and offers six output ranges (up to ±10V) that can be
programmed through the 3-wire SPI serial interface or
pin-strapped for operation in a single range.
Any on-chip register (including DAC output-range set-
Any on-chip register (including DAC output-range set-
tings) can be read for verification in just one instruction
cycle; and if you change register content, the altered
register will be automatically read back during the next
instruction cycle.
Voltage-controlled offset and gain adjustments are also
Voltage-controlled offset and gain adjustments are also
provided; and the power-on reset circuit and CLR pin both
reset the DAC output to 0V regardless of output range.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation and SoftSpan is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
18-Bit Voltage Output DAC with Software-Selectable Ranges
n
Maximum 18-Bit INL Error: ±1 LSB Over Temperature
n
Program or Pin-Strap
Six Output Ranges:
0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V
n
Guaranteed Monotonic Over Temperature
n
Glitch Impulse 0.4nV
•
s (3V), 2nV
•
s (5V)
n
18-Bit Settling Time: 2.1µs
n
2.7V to 5.5V Single Supply Operation
n
Reference Current Constant for All Codes
n
Voltage-Controlled Offset and Gain Trims
n
Serial Interface with Readback of All Registers
n
Clear and Power-On-Reset to 0V Regardless of
Output Range
n
28-Pin SSOP Package
n
Instrumentation
n
Medical Devices
n
Automatic Test Equipment
n
Process Control and Industrial Automation
LTC2756 Integral Nonlinearity
150pF
+
–
LT1012
–
+
LT1468
18-BIT DAC WITH SPAN SELECT
LTC2756
V
OSADJ
R
COM
R
IN
R
OFS
REF
5V
REF
R
FB
I
OUT1
V
OUT
I
OUT2
GND
V
DD
GND
GAIN
ADJUST
GE
ADJ
27pF
0.1µF
5V
4
2756 TA01a
SPI WITH
READBACK
OFFSET
ADJUST
CODE
0
65536
–1.0
INL (LSB)
–0.8
–0.6
–0.4
–0.2
0.6
0.4
0.2
0
0.8
1.0
131072
196608
262143
2756 TA01b
0V TO 10V RANGE