LTC2756_15 Datasheet, PDF (1/24 Pages) Linear Technology – Serial 18-Bit SoftSpan IOUT DAC

Features
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}
Applications
n _{Instrumentation}
n _{Medical Devices}
n _{Automatic Test Equipment}
n _{Process Control and Industrial Automation}
LTC2756
Serial 18-Bit SoftSpan
I_OUT DAC
Description
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-
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
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.
Typical Application
18-Bit Voltage Output DAC with Software-Selectable Ranges
REF
5V
+
LT1012
–
150pF
R_IN
R_COM
REF R_OFS RFB
SPI WITH
4
READBACK
5V
0.1µF
LTC2756
I_OUT1
18-BIT DAC WITH SPAN SELECT
V_DD
I_OUT2
GND
GND
GE_ADJ
GAIN
ADJUST
V_OSADJ
OFFSET
ADJUST
2756 TA01a
27pF
–
LT1468
+
LTC2756 Integral Nonlinearity
V_OUT
1.0
0V TO 10V RANGE
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
65536
131072
CODE
196608 262143
2756 TA01b
2756f
1