Vol. Product Month 16-Bit, 2-Byte Parallel Input, Glitch Mul

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Vol. Product Month 16-Bit, 2-Byte Parallel Input, Glitch Mul

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Vol.
Product Month
16-Bit, 2-Byte Parallel Input, Glitch Multiplying Complete Charger with 4-Quadrant Resistors-LTC1599 Lithium-Ion Batteries MSOP-LTC1731 1599 16-bit multiplying output midscale zero scale, depending
current output DAC. Both accurate ±1LSB over temperature, guaranteeing true 16-bit performance eliminating external calibrations. True 4-quadrant multiplication achieved with on-chip precision multiplication resistors, allowing output ranges 10V, -10V ±10V. LTC1599 operates single supply, typically consuming only 10mW power. LTC1599 offers 2-byte parallel input. asynchronous clear resets
user settings. glitch impulse less than 2nV-s improves performance device industrial control systems. LTC1599 available 24-pin PDIP SSOP packages specified over commercial industrial temperature ranges. full 16-bit parallel interface current output DAC, Linear Technology offers LTC1597. serial interface 16-bit current output DACs, LTC1595 LTC1596 offer comparable performance.
DATA INPUTS MLBYTE MLBYTE
RCOM
LTC1599
16-BIT IOUT2S DGND
CLVL
CLVL
1599 TA01
Figure LTC1599 Achieves 4-Quadrant Multiplication with On-Chip Precision Resistors
CTIMER 0.1µF
Inside This Issue:
500mA, SOT-23 Step-Down Regulator Switches 1MHz-LTC1701 Single/Dual/Quad 400MHz Current Feedback Amplifiers-LT1395/LT1396/LT1397 Simple Converter 48V-LTC1624 Dual Swapwith Independent "ON" Pins Supply Sequencing-LTC1647 Parallel 16-Bit Rail-to-Rail Micropower DAC-LTC1657
Linear Technology Chronicle
IOUT2F
15pF ROFS ROFS IOUT1 15pF LT1468 VOUT
LT1468
0.1µF
LTC1731 complete, linear charge controller lithium-ion batteries. offers highest level integration market create smallest, simplest charger possible. device employs internal resistor dividers achieve charge voltage accuracy without need external precision resistors (Figure charge current programmed with accuracy using external sense resistor (RSENSE) combination with program resistor (RPROGRAM). output float voltage LTC1731-4.2 version 4.2V. Other versions provide output 4.1V, 8.2V 8.4V serve 2-cell systems. LTC1731 controls cost, external P-channel MOSFET selected desired charging current. internal comparator monitors charge current provides flag output when charge current drops programmed current
Continued page
MBRM120T3 SENSE CHRG RSENSE Si9430DY IBAT 500mA
LTC1731-4.2 TIMER PROG RPROG* 19.6k
Li-Ion
CELL
10µF
1731 TA01
*SHUTDOWN INVOKED FLOATING PROG PULLING HIGH
Figure 500mA Li-Ion Charger
registered trademarks Linear Technology Corporation. OPTI-LOOP, Burst Mode Swap trademarks Linear Technology Corporation.
LTC1731 from page
(C/10). This flag output will drive chargestatus LED. built-in timer, programmed with single external capacitor, sets total charge termination time. Deeply discharged cells automatically trickle charged
programmed charge current until cell voltage exceeds 2.5V. LTC1731 wide input voltage range 4.5V 15V, that inexpensive wall adapters used power charger. will charge nickel-cadmium
(NiCd) nickel-metal-hydride (NiMH) batteries with external charge termination. charger's completeness small solution size ideal handheld devices such cellular phones, PDAs digital cameras.
500mA, SOT-23 Step-Down Regulator Switches 1MHz-LTC1701
LTC1701 industry's first step-down, current mode DC/DC converter SOT-23 package. operates from input 2.5V 5.5V maximum) long life single cell Li-Ion 3-/4-cell NiCd/NiMH battery systems. switches 1MHz allow tiny, cost capacitors inductors that less height. area used complete regulator less than 2cm2, shown Figure LTC1701 configured zeta converter buck/boost applications. output voltage adjustable from 1.25V built-in 0.28 switch furnishes 500mA output current efficiency step-down mode.
2.5V 5.5V
LTC1701 incorporates current mode, constant off-time architecture superior line regulation with varying input. Automatic Burst Modeoperation maintains high efficiency output currents using intermittent operation reduce switching losses. With load, converter
draws only 135µA; shutdown, requires less than 1µA. dropout, internal P-channel MOSFET stays continuously, increasing usable battery life. Ceramic capacitors prone changes with temperature their that causes loop stability problems. OPTI-LOOPcompensation, LTC1701 regulator used with ceramic capacitors (Figure Efficiency, shown Figure high quite flat output capacitance ceramic caps.
Figure LTC1701 Circuit with Maximum Height
4.7µH VOUT 2.5V 0.5A 10µF 6.3V
3.0V
EFFICIENCY
LTC1701 ITH/RUN 5.1k 180pF
121k 33pF 121k
5.0V
10µF 6.3V
LOAD CURRENT (mA) 1000 VOUT 2.5V
Figure Ceramic Capacitor Converter Delivers 2.5V 500mA
Figure Efficiency Circuit Figure
Single/Dual/Quad 400MHz Current Feedback Amplifiers- LT1395/LT1396/LT1397
LT1395/LT1396/LT1397 single, dual quad 400MHz current feedback amplifiers with 800V/µs slew rate ability drive 80mA output current. LT1395/LT1396/LT1397 operate single supplies from dual supplies from ±6V. ±5V, they draw only 4.6mA supply current amplifier. LT1395/LT1396/LT1397 family excellent general purpose high speed amps, they especially excel video applications. Gain flatness 0.1dB maintained 100MHz. 0.02%
1.02k 63.4
3.01k LT1396
3.01k VIN+ LT1396 VOUT
0.67pF
0.67pF
12.1k
12.1k
INPUTS
1395/6/7 TA01
Figure Unity-Gain Video Loop-Through Amplifier
differential gain 0.04% differential phase error make each amplifier well suited high performance video applications. 80mA output current also makes LT1395/LT1396/LT1397 family suitable line-driver applications. LT1395/LT1396/LT1397 manufactured Linear Technology's proprietary complementary bipolar process. LT1395 available SO-8 package, LT1396 available SO-8 packages LT1397 available SO-14 SSOP-16.
Contact your local Linear Technology sales office data sheet evaluation samples. more information, visit site www.linear-tech.com.
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Application Month
Simple Converter -48V-LTC1624
supply often required networking equipment. With simple topology input, circuit Figure delivers with greater than efficiency (Figure currentmode controller switches fixed 200kHz small component sizes noise. transformer stores energy during state time During Q1's state time, energy transfers stacked outputs create 48V.
clamps T1's leakage inductance spike provides path input current while off. This results continuous input current lower capacitor ripple-current requirements. Other additions improve circuit's efficiency performance. senses switch current with power loss small size. Connecting BOOST pins increases Q1's gate voltage. addition enhances efficiency
VOUT -48V 0.5A 470µF SANYO MV-GX
speeding transitions further raising gate voltage 5.3V. output short-circuit conditions, LTC1624 will decrease switching frequency reduce input current. LTC1624 SO-8 package includes Burst Mode operation high efficiency load current used standard switching regulator configurations. logic controlled shutdown mode drops supply current 16µA.
MBRS340T3
EFFICIENCY
BAV21
4.7µF FILM
0.82 1N5235B 6.8V MBRS340T3
4.7µF FILM IRL3705N ZTX749 2N5210 2N5210 10.5k -48V
220pF 0.05
10µF
BOOST LTC1624
ZTX649
ITH/RUN 2.2nF 0.022µF
COILTRONICS CTX02-14261. EFD20; WINDINGS, EACH 12µH DALE LPE3325-AO87EES; 980µH RESISTORS: 1/4W,
Figure This Circuit Uses Numerous Tricks Boost Efficiency Converting -48V
Dual Swap with Independent "ON" Pins Supply Sequencing- LTC1647
LTC1647 series dual Swap controllers designed automatically turn supplies controlled manner, allowing boards safely inserted
into removed from live backplane device bay. versions serve single supply power distribution systems, while another version allows general purpose swapping supply sequencing independent supplies. Each version supports voltages ranging from 2.7V 16.5V. Using external N-channel MOSFETs, LTC1647 ramps supply voltages programmed rate. Each channel provides
Contact your local Linear Technology sales office data sheet evaluation samples. more information, visit site www.linear-tech.com.
Linear Technology Chronicle
1500µF 6.3V SANYO MV-GX
5.25V
470µF SANYO MV-GX
4.75V
OUTPUT CURRENT
Figure Circuit Figure Delivers Greater Than Efficiency Much Output Current Range
inrush current limiting plus programmable, electronic circuit breaker that protects against overloads shorts. pins used independently control board power supplies clear fault. LTC1647 ideally suited power control portable computers. Figure shows application using LTC1647-1 system side device interface (1394 and/or USB).
Continued page
LTC1647 from page
device available small SO-8 16-pin SSOP packages. SO-8 configurations have pins controlling independent loads from same input supply. LTC1647-2 supports automatic retry whereas LTC1647-1 latches supplies event overcurrent fault. 16-pin SSOP version (LTC1647-3) separates fault pins either allow both automatic retry latch supplies; includes separate inputs dual supply voltage applications.
CONNECTOR
3.3V SUPPLY
MMDF3N02HD
DEVICE
R3**
CLOAD*
R4**
1394 AND/OR PORT
SENSE SENSE LTC1647-1
GATE
4.7nF
GATE
CLOAD USER-SELECTED BASED DEVICE REQUIREMENTS OPTIONAL DISCHARGE RESISTORS WHEN DEVICES POWERED-OFF SEMICONDUCTOR
4.7nF DEVICE
MMDF3N02HD
CONNECTOR
R7**
CLOAD*
R8**
1394 AND/OR PORT
1647-1/2/3 TA01
Figure Controller Device Bays; Fault Outputs Auto Retry, Substitute LTC1647-2
Parallel 16-Bit Rail-toRail Micropower DAC- LTC1657
LTC1657 single, parallel interface, 16-bit, rail-to-rail micropower DAC. LTC1657 operates with single supply, drawing only 650µA. With ±1LSB
maximum error, LTC1657 offers true 16-bit monotonicity over full operating temperature range. This critical closed-loop feedback systems such industrial control. LTC1657 includes internal 2.048V bandgap voltage reference. driven this reference external reference achieve larger output swings positive supply rail).
REFHI REFOUT REFERENCE 2.048V
(MSB) DATA FROM MICROPROCESSOR DATA (LSB) CSMSB FROM MICROPROCESSOR DECODE LOGIC CSLSB LDAC FROM SYSTEM RESET POWER-ON RESET 8-BIT INPUT REGISTER 16-BIT REGISTER 8-BIT INPUT REGISTER
full-scale output times reference input voltage, depending X1/X2 connected. part also includes internal rail-to-rail output buffer, eliminating need external amps. LTC1657 offers parallel 16-bit 2-byte double-buffered digital interface. This device ideal instrumentation, adjustment, industrial process control applications. LTC1657 similar Linear Technology Corporation's LTC1450 12-bit VOUT DAC, allowing upgrade path 16-bit performance. LTC1657 available 28-pin SSOP PDIP packages both commercial industrial temperature ranges.
16-BIT
VOUT
4.096V
Linear Technology Products Distributed
Arrow Electronics Arrow/Zeus Components Digi-Key Gerber Electronics Avnet Wyle Electronics
2000 Linear Technology Corporation/Printed
REFLO
X1/X2
1657 TA01
Figure LTC1657 Offers 2-Byte Double Buffered Parallel Interface
Contact your local Linear Technology sales office data sheet evaluation samples. more information, visit site www.linear-tech.com.
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com Literature Only: 1-800-4-LINEAR Linear Technology Chronicle

Vol. Product Month 16-Bit, 2-Byte Parallel Input, Glitch Mul

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