LTC2758_15 Datasheet, PDF (1/24 Pages) Linear Technology – Dual Serial 18-Bit SoftSpan IOUT DACs

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 _{1µA Maximum Supply Current}
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 _{48-Pin 7mm × 7mm LQFP Package}
APPLICATIONS
n _{Instrumentation}
n _{Medical Devices}
n _{Automatic Test Equipment}
n _{Process Control and Industrial Automation}
LTC2758
Dual Serial 18-Bit
SoftSpan I_OUT DACs
DESCRIPTION
The LTC^®2758 is a dual 18-bit multiplying serial-input,
current-output digital-to-analog converter. LTC2758A
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 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 outputs to 0V regardless of output range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
Dual 18-Bit V_OUT DAC with Software-Selectable Ranges
GAIN A
ADJUST
LT1012
REFERENCE
5V
5V
0.1µF
SPI WITH ⁴
READBACK
GE_ADJA R_OFSA REFA
R_COMA R_INA
R_FBA
V_DD
DAC A
I_OUT1A
I_OUT2A
27pF
–
V_OUTA
+
LT1468
LTC2758
V_OSADJA
R_FBB
OFFSET A ADJUST
I_OUT1B
2_–7pF
DAC B
I_OUT2B
+
V_OUTB
GND
V_OSADJB
LT1468
OFFSET B ADJUST
GE_ADJB R_OFSB REFB
GAIN B
ADJUST
LT1012
R_COMB
R_INB
2758 TA01a
REFERENCE
5V
LTC2758 Integral Nonlinearity
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
2758 TA01b
2758fa
For more information www.linear.com/LTC2758
1