LTC2668_15 Datasheet, PDF (1/28 Pages) Linear Technology – 16-Channel 16-/12-Bit 10V VOUT SoftSpan DACs with 10ppm/C Max Reference

Features
nn _{Precision Reference 10ppm/°C Max}
nn _{Independently Programmable Output Ranges:}
0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V
nn _{Full 16-Bit/12-Bit Resolution at All Ranges}
nn _{Maximum INL Error: ±4LSB at 16 Bits}
nn _{A/B Toggle via Software or Dedicated Pin}
nn _{16:1 Analog Multiplexer}
nn _{Guaranteed Monotonic Over Temperature}
nn _{Internal or External Reference}
nn _{Outputs Drive ±10mA Guaranteed}
nn _{1.8V to 5V SPI Serial interface}
nn _{6mm × 6mm 40-Lead QFN Package}
Applications
nn _{Optical Networking}
nn _{Instrumentation}
nn _{Data Acquisition}
nn _{Automatic Test Equipment}
nn _{Process Control and Industrial Automation}
LTC2668
16-Channel 16-/12-Bit ±10V
V_OUT SoftSpan DACs with
10ppm/°C Max Reference
Description
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.
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.
Block Diagram
REFCOMP 34
OVRTMP 38
GND
V_REF
14, 37
REFLO
13, 35
V_OUT0 2
V_OUT1 3
V_OUT2 4
V_OUT3 5
V_OUT4 6
V_OUT5 7
V_OUT6 8
V_OUT7 9
DAC 0
V_REF
DAC 7
CS/LD 16
SCK 17
SDI 19
SDO 18
MUX 12
INTERNAL REFERENCE
MUX
MUX
33 REF
36 AVP
V_REF
V⁺
10, 31
V^–
11, 32
DAC 15
30 VOUT15
29 V_OUT14
28 VOUT13
27 VOUT12
V_REF 26 ^VOUT11
MUX
MUX
25 VOUT10
24 VOUT9
DAC 8
23 VOUT8
21 CLR
15 LDAC
CONTROL LOGIC
DECODE
20 TGP
39 MSP0
32-BIT SHIFT REGISTER
POWER-ON RESET
MONITOR MUX TOGGLE SELECT REGISTER
40 MSP1
1 MSP2
22 OVP
2668 TA01a
Integral Nonlinearity (LTC2668-16)
4
±10V RANGE
3
2
1
0
–1
–2
–3
–4
0
16384
32768
CODE
49152 65535
2668 TA01b
For more information www.linear.com/LTC2668
2668fa
1