LTC1661C LINER [Linear Technology], LTC1661C Datasheet

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LTC1661C

Manufacturer Part Number
LTC1661C
Description
Micropower Dual 10-Bit DAC in MSOP
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIO S
FEATURES
BLOCK DIAGRA
, LTC and LT are registered trademarks of Linear Technology Corporation.
Tiny: Two 10-Bit DACs in an 8-Lead MSOP—
Half the Board Space of an SO-8
Micropower: 60 A per DAC
Sleep Mode: 1 A for Extended Battery Life
Rail-to-Rail Voltage Outputs Drive 1000pF
Wide 2.7V to 5.5V Supply Range
Double Buffered for Independent or Simultaneous
DAC Updates
Reference Range Includes Supply for Ratiometric
0V-to-V
Reference Input Has Constant Impedance over All
Codes (260k Typ)—Eliminates External Buffers
3-Wire Serial Interface with
Schmitt Trigger Inputs
Differential Nonlinearity:
Mobile Communications
Digitally Controlled Amplifiers and Attenuators
Portable Battery-Powered Instruments
Automatic Calibration for Manufacturing
Remote Industrial Devices
V
OUT A
8
CC
GND
10-BIT
DAC A
Output
7
CS/LD
1
U
CONTROL
W
LOGIC
SCK
2
0.75LSB Max
SHIFT REGISTER
ADDRESS
DECODER
10-BIT
DAC B
DESCRIPTIO
The LTC
sable, 10-bit digital-to-analog converters (DACs) in a
single tiny MS8 package. Each buffered DAC draws just
60 A total supply current, yet is capable of supplying DC
output currents in excess of 5mA and reliably driving
capacitive loads up to 1000pF. Sleep mode further re-
duces total supply current to a negligible 1 A.
Linear Technology’s proprietary, inherently monotonic
voltage interpolation architecture provides excellent lin-
earity while allowing for an exceptionally small external
form factor. The double-buffered input logic provides
simultaneous update capability and can be used to write to
either DAC without interrupting Sleep mode.
Ultralow supply current, power-saving Sleep mode and
extremely compact size make the LTC1661 ideal for
battery-powered applications, while its straightforward
usability, high performance and wide supply range make
it an excellent choice as a general purpose converter.
For additional outputs and even greater board density,
please refer to the LTC1660 micropower octal DAC for
10-bit applications. For 8-bit applications, please consult
the LTC1665 micropower octal DAC.
V
D
6
3
CC
IN
V
1661 BD
OUT B
REF
®
5
4
1661 integrates two accurate, serially addres-
10-Bit DAC in MSOP
U
–0.20
–0.40
–0.60
–0.75
0.75
0.60
0.40
0.20
Micropower Dual
0
Differential Nonlinearity (DNL)
0
256
CODE
512
LTC1661
768
1661 G02
1023
1

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LTC1661C Summary of contents

Page 1

FEATURES Tiny: Two 10-Bit DACs in an 8-Lead MSOP— Half the Board Space of an SO-8 Micropower per DAC Sleep Mode for Extended Battery Life Rail-to-Rail Voltage Outputs Drive 1000pF Wide 2.7V to 5.5V Supply Range ...

Page 2

... Capacitance I Reference Current REF Power Supply V Positive Supply Voltage CC I Supply Current Operating Temperature Range LTC1661C ............................................. 0.3V LTC1661I ........................................... – Lead Temperature (Soldering, 10 sec)................ 300 ORDER PART NUMBER CS/LD 1 LTC1661CMS8 SCK 2 LTC1661IMS8 REF ...

Page 3

ELECTRICAL C HARA TERISTICS C temperature range, otherwise specifications are at T SYMBOL PARAMETER DC Performance Short-Circuit Current Low Short-Circuit Current High AC Performance Voltage Output Slew Rate Voltage Output Settling Time Capacitive Load Driving Digital I/O V Digital Input ...

Page 4

LTC1661 CHARACTERISTICS Note 3: Digital inputs Note 4: Load is 10k in parallel with 100pF TYPICAL PERFOR A CE CHARACTERISTICS Integral Nonlinearity (INL) 2.0 1.5 1.0 0.5 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation vs Output Current REF CODE = 512 1.5 1 0.5 0 –0.5 –1 –1.5 SOURCE SINK –2 –2 – (mA) OUT ...

Page 6

LTC1661 PIN FUNCTIONS CS/LD (Pin 1): Serial Interface Chip Select/Load Input. When CS/LD is low, SCK is enabled for shifting data on D into the register. When CS/LD is pulled high, SCK is disabled and the operation(s) ...

Page 7

U OPERATIO Transfer Function The transfer function for the LTC1661 is OUT IDEAL ( ) REF 1024 where k is the decimal equivalent of the binary DAC input code D9-D0 and V is the voltage at REF ...

Page 8

LTC1661 U OPERATIO Table 2. DAC Control Functions CONTROL INPUT REGISTER STATUS Change Load DAC Load DAC ...

Page 9

U OPERATIO Voltage Outputs Each of the rail-to-rail output amplifiers contained in the LTC1661 can typically source or sink up to 5mA (V = 5V). The outputs swing to within a few millivolts CC of either supply when unloaded and ...

Page 10

LTC1661 U TYPICAL APPLICATIO DAC A 1 CS/LD LTC1661 SCK DAC DAC B 1 LTC1661 DAC A 7 Figure 3. ...

Page 11

PACKAGE DESCRIPTION 0.007 0 – 6 TYP (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT ...

Page 12

LTC1661 U TYPICAL APPLICATIO 5V 0 DAC A 1 CS/LD LTC1661 SCK DAC DAC B 1 LTC1661 DAC A 7 RELATED PARTS PART ...

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