LTC2654
Quad 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
DESCRIPTION
FEATURES
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Precision Reference 10ppm/°C Max
Maximum INL Error: ±4LSB at 16-Bits
Low ±2mV (Max) Offset Error
Guaranteed Monotonic Over Temperature
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2654-L)
Integrated Reference Buffers
Ultralow Crosstalk Between DACs (<3nV•s)
Power-on-Reset to Zero-Scale/Mid-Scale
Asynchronous DAC Update Pin
Tiny 20-Lead 4mm × 4mm QFN and 16-Lead Narrow
SSOP Packages
APPLICATIONS
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Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
Automotive
The LTC®2654 is a family of quad 16-/12-bit rail-to-rail
DACs with integrated 10ppm/°C maximum reference . The
DACs have built-in high performance, rail-to-rail, output
buffers and are guaranteed monotonic. The LTC2654-L
has a full-scale output of 2.5V with the integrated reference and operates from a single 2.7V to 5.5V supply.
The LTC2654-H has a full-scale output of 4.096V with
the integrated reference and operates from a 4.5V to
5.5V supply. Each DAC can also operate with an external
reference, which sets the full-scale output to 2 times the
external reference voltage.
These DACs communicate via a SPI/MICROWIRE compatible 4-wire serial interface which operates at clock rates
up to 50MHz. The LTC2654 incorporates a power-on reset
circuit that is controlled by the PORSEL pin. If PORSEL
is tied to GND the DACs reset to zero-scale. If PORSEL is
tied to VCC, the DACs reset to mid-scale.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5396245, 6891433 and patent pending.
BLOCK DIAGRAM
REFCOMP
REFIN/OUT
INTERNAL REFERENCE
GND
INL Curve
VCC
4
DAC D
DAC C
2
VOUTC
1
0
–1
–2
–3
CS/LD
CONTROL LOGIC
DECODE
POWER-ON
RESET
PORSEL
SDO
SCK
SDI
LDAC
VCC = 5V
3
VOUTD
INL (LSB)
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
DAC B
REGISTER
VOUTB
DAC A
REGISTER
VOUTA
REGISTER
REFLO
32-BIT SHIFT REGISTER
–4
128
16384
32768
CODE
49152
65535
2654 TA01b
CLR
2654 TA01a
2654f
1
