LTC2757_15 Datasheet, PDF (1/20 Pages) Linear Technology – 18-Bit SoftSpan IOUT DAC with Parallel I/O

LTC2757
18-Bit SoftSpan I_OUT DAC
with Parallel I/O
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 _{Low Glitch Impulse 1.4nV•s (3V), 3nV•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 _{Parallel Interface with Readback of All Registers}
n _{Clear and Power-On-Reset to 0V Regardless of}
Output Range
n _{48-Pin 7mm × 7mm LQFP Package}
APPLICATIONS
n _{Instrumentation}
n _{Medical Devices}
n _{Automatic Test Equipment}
n _{Process Control and Industrial Automation}
DESCRIPTION
The LTC^®2757 is an 18-bit multiplying parallel-input, cur-
rent-output digital-to-analog converter that provides full 18-
bit performance—INL and DNL of ±1LSB maximum—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 parallel interface or pin-strapped for operation
in a single range.
In addition to its precision DC specifications, the LTC2757
also offers excellent AC specifications, including 2.1μs
full-scale settling to 1LSB and 1.4nV•s glitch impulse.
The LTC2757 uses a bidirectional input/output parallel
interface that allows readback of any on-chip register,
including DAC output-range settings; and a CLR pin and
power-on reset circuit that each 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. 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
WR
UPD
READ
D/S
CLR
WR
LTC2757
I_OUT1
UPD
READ
18-BIT DAC WITH SPAN SELECT
I_OUT2
D/S
GND
CLR
M-SPAN _GEADJ
V_OSADJ ^VDD
2757 TA01
GAIN
ADJUST
SPAN I/O
S2-S0
DATA I/O
D17-D0
OFFSET
ADJUST
27pF
–
LT1468
+
5V
0.1μF
LTC2757 Integral Nonlinearity
1.0
±10V RANGE
0.8
0.6
0.4
0.2
0
–0.2
–0.4
V_OUT
–0.6
–0.8
–1.0
0
65536
131072
CODE
90°C
25°C
–45°C
196608 262143
2757 TA01b
2757f
1