LTC1428CS8-50 Linear Technology, LTC1428CS8-50 Datasheet

IC D/A CONV 8BIT SINK OUT 8-SOIC

LTC1428CS8-50

Manufacturer Part Number
LTC1428CS8-50
Description
IC D/A CONV 8BIT SINK OUT 8-SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1428CS8-50

Number Of Bits
8
Data Interface
Serial
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
120µW
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Settling Time
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1428CS8-50
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1428CS8-50#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1428CS8-50#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL
Precision Full-Scale DAC Output Current
at 25 C: 50 A 3%
Wide Output Voltage DC Compliance: 2V to 10V
Wide Supply Range: 3V V
Supply Current in Shutdown: 0.2 A
Low Supply Current: 130 A
Available in 8-Pin SO
Triple Mode
1. Standard 3-Wire Mode
2. 1-Wire Pulse Mode Interface: Increment-Only
3. 2-Wire Pulse Mode Interface: Increment/Decrement
DAC Value Read Back Capability in 3-Wire Mode
DAC Powers Up at Midrange
DAC Contents Are Retained in Shutdown
LCD Contrast Control
Backlight Brightness Control
Power Supply Voltage Adjustment
Battery Charger Voltage/Current Adjustment
GaAs FET Bias Adjustment
Trimmer Pot Elimination
L1: 4.7 H MURATA-ERIE LQH3C
D1: MBR0530 OR 1N4148
CELLS
2
APPLICATION
TM
Interface
U
1 F
SHDN
CC
Digitally Controlled LCD Bias Generator (Standard 3-Wire Mode)
SHDN
GND
U
LT
6.5V
®
V
1307
IN
V
C
SW
L1
FB
100k
4700pF
D1
R1
240k
R2
22k
R3
22k
Sink Output D/A Converter
DESCRIPTION
The LTC
output D/A converter (DAC) with an output range of 0 A to
50 A. In 3.3V or 5V systems, the DAC I
biased from 2V to 10V. Supply current is only 130 A.
Shutdown mode drops the supply current to 0.2 A.
The LTC1428-50 communicates with external circuitry by
using one of three interface modes: standard 3-wire serial
mode or one of two pulse modes. Upon power-up, the
internal counter resets to 10000000B, the DAC output
assumes midrange and the chip configures to 3-wire or
pulse mode depending on the CS signal level.
In 3-wire mode, the system MPU can serially transfer
8-bit data to and from the LTC1428-50. In pulse mode, the
upper six bits of the DAC output program for increment-
only (1-wire interface) or increment/decrement (2-wire
interface) operation depending on the D
increment-only mode, the counter rolls over and sets the
DAC to zero if the counter increases beyond full scale. In
increment/decrement mode, the counter stops
incrementing at full scale, stops decrementing at zero
scale and does not roll over.
LTC1428-50 is available in an 8-pin SO package.
Triple Mode is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C1
0.1 F
Micropower 8-Bit Current
V
15.75V TO 27.75V IN STEPS OF 47mV
15mA FROM 2 CELLS
OUT
®
1
2
3
4
1428-50 is a micropower 8-bit current sink
I
V
SHDN
CLK
OUT
CC
LTC1428-50
D
GND
U
OUT
D
CS
IN
6
5
8
7
1428-50 TA01
V
P1.3
P1.2
P1.1
P1.0
LTC1428-50
5V
CC
(e.g., 8051)
MPU
IN
OUT
signal level. In
pin can be
1

Related parts for LTC1428CS8-50

LTC1428CS8-50 Summary of contents

Page 1

... DAC to zero if the counter increases beyond full scale. In increment/decrement mode, the counter stops incrementing at full scale, stops decrementing at zero scale and does not roll over. LTC1428-50 is available in an 8-pin SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. Triple Mode is a trademark of Linear Technology Corporation OUT 15 ...

Page 2

... CC CLK OUT OUT Bias Voltage = 2.5V OUT ) 3V OUT ) 10V OUT 400 400 2mA O = 1mA INFORMATION ORDER PART TOP VIEW NUMBER 8 D OUT LTC1428CS8-50 D (UP/DN GND PART MARKING S8 PACKAGE 14285 = 125 C, = 130 MIN TYP MAX 3.0 6 130 225 0 48.5 50 51.5 47.5 50 52.5 200 0 ...

Page 3

RECO E DED OPERATI G CO DITIO S SYMBOL PARAMETER Serial Interface f Clock Frequency CLK t Setup Time, CLK Before CS CKS t Setup Time, CS Before CLK CSS Valid DV OUT ...

Page 4

LTC1428- TYPICAL PERFORMANCE CHARACTERISTICS Temperature Variation 52 3. 2.5V OUT 51.5 50.5 49.5 48.5 47.5 – 55 – 125 155 5 TEMPERATURE ( C) 1428-50 G04 U U ...

Page 5

W BLOCK DIAGRA POWER-ON RESET CLK SHDN TEST CIRCUITS Load Circuit for OUT 1428-50 TC01 Voltage Waveforms for t CLK 0. OUT LATCH VOLTAGE AND REFERENCE LOGIC SHDN UP ...

Page 6

LTC1428-50 U SERIAL I/O OPERATI G SEQUE CKS CLK t CSS Hi OUT U U APPLICATIONS INFORMATION 8-BIT CURRENT OUTPUT DAC The LTC1428- 8-bit, current sink ...

Page 7

... V DD OUT Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights DAC output by one step. The last two LSBs are always zero in pulse mode ...

Page 8

... CC IN LTC1428- (e.g., 8051) SHDN GND 5 4 CLK CS P1.2 P1.1 P1.0 1428-50 TA03 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157** 0.228 – 0.244 (3.810 – 3.988) SO8 0996 1428f LT/TP 0198 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 MPU ...

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