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LTC2668
1
2668fa
For more information www.linear.com/LTC2668
Block Diagram
Features Description
16-Channel 16-/12-Bit ±10V
V
OUT
SoftSpan DACs with
10ppm/°C Max Reference
The LTC
®
2668 is a family of 16-channel, 16-/12-bit ±10V
digital-to-analog converters with integrated precision
references. They are guaranteed monotonic and have
built-in rail-to-rail output buffers. These SoftSpan™ DACs
offer five output ranges up to ±10V. The range of each
channel is independently programmable, or the part can
be hardware-configured for operation in a fixed range.
The integrated 2.5V reference is buffered separately to each
channel; an external reference can be used for additional
range options. The LTC2668 also includes A/B toggle
capability via a dedicated pin or software toggle command.
The SPI/Microwire-compatible 3-wire serial interface
operates on logic levels as low as 1.71V at clock rates
up to 50MHz.
Integral Nonlinearity (LTC2668-16)
applications
n
Precision Reference 10ppm/°C Max
n
Independently Programmable Output Ranges:
0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V
n
Full 16-Bit/12-Bit Resolution at All Ranges
n
Maximum INL Error: ±4LSB at 16 Bits
n
A/B Toggle via Software or Dedicated Pin
n
16:1 Analog Multiplexer
n
Guaranteed Monotonic Over Temperature
n
Internal or External Reference
n
Outputs Drive ±10mA Guaranteed
n
1.8V to 5V SPI Serial interface
n
6mm × 6mm 40-Lead QFN Package
n
Optical Networking
n
Instrumentation
n
Data Acquisition
n
Automatic Test Equipment
n
Process Control and Industrial Automation
L, LT, LT C , LT M, 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.
RGSTR A
INTERNAL REFERENCE
RGSTR B
RGSTR B
CONTROL LOGIC DECODE
TOGGLE SELECT REGISTERMONITOR MUX
POWER-ON RESET
RGSTR A
REFCOMP
OVRTMP
2668 TA01a
GND
14, 37
REFLO
13, 35
MUX
REGISTERSPAN
SPAN
DAC 0
V
REF
V
REF
MUX
REGISTERSPAN
SPAN
DAC 15
V
REF
RGSTR ARGSTR B
RGSTR B
RGSTR A
MUX
REGISTERSPAN
SPAN
DAC 7
•••
•••
•••
•••
•••
•••
•••
•••
MUX
REGISTERSPAN
SPAN
DAC 8
V
REF
34
38
V
OUT0
V
OUT1
V
OUT2
V
OUT3
2
3
4
5
V
OUT4
V
OUT5
V
OUT6
V
OUT7
6
7
8
9
CS/LD
SCK
SDI
SDO
16
17
19
18
MUX
12
REF
AVP
V
+
10, 31
V
–
11, 32
33
36
V
OUT13
V
OUT12
V
OUT11
V
OUT10
28
27
V
OUT15
V
OUT14
30
29
26
25
V
OUT9
V
OUT8
CLR
LDAC
24
23
21
15
TGP
MSP0
MSP1
MSP2
20
39
40
1
OVP
22
32-BIT SHIFT REGISTER
CODE
±10V RANGE
0
–4
INL (LSB)
0
–1
–2
–3
1
2
3
4
16384
32768 49152
2668 TA01b
65535
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