Linear Technology LTC2758 Dual 18-Bit SoftSpan IOUT DAC with Serial SPI Interface Demo Board, req DC590B DC1684A-A DC1684A-A 数据表
产品代码
DC1684A-A
LTC2758
1
2758fa
For more information
www.linear.com/LTC2758
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Serial 18-Bit
SoftSpan I
OUT
DACs
The
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-
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 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.
Dual 18-Bit V
OUT
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
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
n
Instrumentation
n
Medical Devices
n
Automatic Test Equipment
n
Process Control and Industrial Automation
LTC2758 Integral Nonlinearity
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
2758 TA01b
0V TO 10V RANGE
LTC2758
5V
4
SPI WITH
READBACK
GND
V
DD
–
+
+
–
DAC B
DAC A
REFERENCE
5V
V
OUTA
V
OUTB
R
INA
REFA
REFERENCE
5V
REFB
R
OFSA
GE
ADJA
GE
ADJB
R
OFSB
R
COMB
R
COMA
R
INB
V
OSADJA
V
OSADJB
I
OUT1A
I
OUT2A
I
OUT1B
I
OUT2B
R
FBA
R
FBB
–
+
+
+
–
2758 TA01a
LT1012
LT1012
LT1468
LT1468
0.1µF
OFFSET A ADJUST
OFFSET B ADJUST
GAIN A
ADJUST
GAIN B
ADJUST
27pF
27pF