LTC2634_1 Datasheet, PDF (1/30 Pages) Linear Technology – Quad 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/°C Reference

FEATURES
n _{Integrated Precision Reference}
2.5V Full-Scale 10ppm/°C (LTC2634-L)
4.096V Full-Scale 10ppm/°C (LTC2634-H)
n _{Maximum INL Error: ±2.5 LSB (LTC2634-12)}
n _{Low Noise: 0.75mVP-P 0.1Hz to 200KHz}
n _{Guaranteed Monotonic over –40°C to 125°C}
Temperature Range
n _{Selectable Internal or External Reference}
n _{2.7V to 5.5V Supply Range (LTC2634-L)}
n _{Ultralow Crosstalk Between DACs (2.4nV•s)}
n _{Low Power: 0.6mA at 3V}
n _{Power-On Reset to Zero-Scale/Mid-Scale}
n _{Double Buffered Data Latches}
n _{Tiny 16-Lead 3mm × 3mm QFN and 10-Lead}
MSOP Packages
APPLICATIONS
n _{Mobile Communications}
n _{Process Control and Industrial Automation}
n _{Automatic Test Equipment}
n _{Portable Equipment}
n _Automotive
LTC2634
Quad 12-/10-/8-Bit
Rail-to-Rail DACs with
10ppm/°C Reference
DESCRIPTION
The LTC^®2634 is a family of quad 12-, 10- and 8-bit volt-
age output DACs with an integrated, high accuracy, low
drift 10ppm/°C reference in 16-lead QFN and 10-lead
MSOP packages. It has rail-to-rail output buffers and is
guaranteed monotonic. The LTC2634-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2634-H has a full-scale output of 4.096V,
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 the external reference voltage.
These DACs communicate via an SPI/MICROWIRE compat-
ible 3-wire serial interface which operates at clock rates
up to 50MHz. Serial data output (SDO), a hardware clear
(CLR), and an asynchronous DAC update (LDAC) capability
are available in the QFN package. The LTC2634 incorporates
a power-on reset circuit. Options are available for reset
to zero-scale or reset to mid-scale in internal reference
mode, or reset to mid-scale in external reference mode
after power-up.
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, 5859606, 6891433, 6937178, 7414561.
BLOCK DIAGRAM
GND
(REFLO)
V_OUTA
DAC A
V_REF
V_OUTB
DAC B
CS/LD
SCK
(LDAC)
( ) QFN PACKAGE ONLY
INTERNAL
REFERENCE
SWITCH
REF
V_REF
V_CC
DAC D
V_OUTD
DAC C
V_REF
V_OUTC
SDI
CONTROL
LOGIC
DECODE
32-BIT SHIFT REGISTER
POWER-ON
RESET
(CLR)
(SDO)
2634 BD
Integral Nonlinearity
(LTC2634-LZ12)
2
V_CC = 3V
INTERNAL REF
1
0
–1
–2
0
1024
2048
CODE
3072
4095
2634 TA01
2634fb
1