®1329-10/LTC1329-50/LTC1329A-50 micropower 8-bit current output conver

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®1329-10/LTC1329-50/LTC1329A-50 micropower 8-bit current output conver

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LTC1329-10/ LTC1329-50/LTC1329A-50 Micropower 8-Bit Current Output Converter
®1329-10/LTC1329-50/LTC1329A-50 micropower 8-bit current output converters (DACs) with output range 10µA LTC1329-10 50µA LTC1329-50/LTC1329A-50. current output biased from 2.5V 3.3V systems, respectively. Supply current only 95µA LTC1329-50/LTC1329A-50 75µA LTC1329-10. shutdown mode drops supply current 0.2µA. LTC1329 communicate with external circuitry using three interface modes: standard 3-wire serial mode pulse modes. Upon power-up, internal counter resets 1000 0000B, output assumes midrange chip configured 3-wire pulse mode depending signal level 3-wire mode, system serially transfer 8-bit data from LTC1329. pulse mode, upper bits output programmed increment-only (1-wire interface) increment/decrement (2-wire interface) operation depending signal level DIN. LTC1329 available 8-pin packages.
registered trademarks Linear Technology Corporation. Triple Mode trademark Linear Technology Corporation.
Guaranteed Precision Full-Scale Output Current 25°C: LTC1329A-50 50µA LTC1329-10 10µA LTC1329-50 50µA Wide Output Voltage Compliance: 2.5V Wide Supply Range: 2.7V 6.5V Supply Current Shutdown: 0.2µA Supply Current: 75µA LTC1329-10, 95µA LTC1329-50/LTC1329A-50 Available 8-Pin Triple ModeInterface Modes Standard 3-Wire Mode Pulse Mode 1-Wire Interface: Increment-Only Pulse Mode 2-Wire Interface: Increment/Decrement Read Back 8-Bit Value 3-Wire Mode Powers Midrange Contents Retained Shutdown
APPLICATIONS
Contrast Control Backlight Brightness Control Battery Charger Current/Voltage Adjustment Power Supply Voltage Adjustment Trimmer Elimination
TYPICAL APPLICATION
Digitally Controlled Bias Generator
®1173 1N5818 ILIM 100µH
1N4148
200k
0.1µF IOUT DOUT (e.g., 8051)
47µF
4.7µF 10.1k 1N5818
LTC1329-50 SHDN
22µF *GOWANDA GA10-103K COILTRONICS CTX100-4
220k VOUT -22V 40mA
1329 TA01
P1.2 P1.1 P1.0
LTC1329-10/ LTC1329-50/LTC1329A-50
ABSOLUTE MAXIMUM RATINGS
(Note
PACKAGE/ORDER INFORMATION
VIEW IOUT SHDN DOUT (UP/DN)
Supply Voltage (VCC) Input Voltage (All Inputs). 0.3V (VCC 0.3V) Output Voltage IOUT (VCC 0.3V) DOUT 0.3V (VCC 0.3V) Short-Circuit Duration (All Outputs) Indefinite Operating Temperature Range 70°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1329CS8-10 LTC1329CS8-50 LTC1329ACS8-50 PART MARKING 13291 1329A5 13295
PACKAGE 8-LEAD PLASTIC
TJMAX 125°C, 150°C/
Consult factory Industrial Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Supply Current CONDITIONS
3.3V, 25°C, unless otherwise specified.
LTC1329-10 10.3 10.5 48.5 47.5 49.5 49.0 LTC1329-50/LTC1329A-50 51.5 52.5 50.5 51.0 ±0.9 ±0.25 ±1.5 0.80 0.45 0.80 0.45 UNITS Bits
VSHDN VDIN VCC, VCLK DOUT IOUT Shutdown Output Voltage IOUT 0.45V, 25°C (LTC1329-10, LTC1329-50) Output Voltage IOUT 0.45V, 25°C (LTC1329A-50) Output Voltage IOUT 0.45V Monotonicity Guaranteed
Resolution Full-Scale Current
IIH,
5.5V, IOUT Full Scale, Output Voltage IOUT 0.45V 2.7V 6.5V, Full Scale, Output Voltage IOUT 0.45V Output Voltage Rejection IOUT Full Scale, Output Voltage IOUT IOUT Full Scale, Output Voltage IOUT 2.5V Logic Input Current High Level Input Voltage 3.3V Level Input Voltage 3.3V High Level Output Voltage 400µA 3.3V, 400µA Level Output Voltage 3.3V, Three-State Output Leakage
Zero-Scale Current Differential Nonlinearity Supply Voltage Rejection
±0.3 ±2.5 ±0.25
±0.9 ±1.5 ±2.5
LTC1329-10/ LTC1329-50/LTC1329A-50
RECO
fCLK tCKS tCSS tCKHI tCKLO tCSH tCKH tCSLO tCSHI
OPERATI DITIO
CONDITIONS
SYMBOL PARAMETER Serial Interface Clock Frequency Setup Time, Before Setup Time, Before DOUT Valid Setup Time Before Hold Time After DOUT Valid High Time Time Before DOUT Hi-Z Before Time High Time
Test Circuit
Test Circuit
Test Circuits fCLK 2MHz (Note VCLK
denotes specifications which apply over full operating temperature range. Note Absolute Maximum Ratings those values beyond which life device impaired.
Note Timing input signals measured 0.8V High-to-Low transition Low-to-High transition. Note Timing specification guaranteed tested. Note This minimum time required valid data transfer.
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1329-10 Code
(LSB)
LTC1329-10 Code
25°C 3.3V V(IOUT) 0.45V
25°C 3.3V V(IOUT) 0.45V
(LSB)
-0.2 -0.4 -0.6 -0.8 -1.0 CODE
1392
-0.2 -0.4 -0.6 -0.8 -1.0 CODE
1329 TPC02
(LSB)
3.3V, unless otherwise specified. (Notes
UNITS
4550
LTC1329-50 Code
-0.2 -0.4 -0.6 -0.8 -1.0 CODE
1392
25°C 3.3V V(IOUT) 0.45V
LTC1329-10/ LTC1329-50/LTC1329A-50 TYPICAL PERFORMANCE CHARACTERISTICS
LTC1329-50 Code
(LSB)
FULL-SCALE IOUT ERROR (LSB)
FULL-SCALE IOUT ERROR (LSB)
25°C 3.3V V(IOUT) 0.45V
-0.2 -0.4 -0.6 -0.8 -1.0 CODE
1329 TPC04
LTC1329-10/LTC1329-50 Bias Voltage Rejection (Full-Scale Current)
FULL-SCALE IOUT ERROR (LSB) ZERO-SCALE IOUT CURRENT (nA)
MAXIMUM IOUT BIAS VOLTAGE
25°C 3.3V
-0.1 -0.2 -0.3 -0.4 -0.5 IOUT BIAS VOLTAGE LTC1329-10 LTC1329-50
FUNCTIONS
IOUT (Pin Current Output. 3.3V systems, current output biased from 2.5V respectively. (Pin Voltage Supply (2.7V 6.5V). This supply must kept free from noise ripple bypassing directly ground plane. SHDN (Pin Shutdown. logic puts chip into Shutdown mode. digital setting retained. (Pin Shift Clock. This clock synchronizes serial data 3-wire mode. This Schmitt trigger input. (Pin Chip Select Input. 3-wire mode, logic this enables LTC1329. Upon power-up, logic high puts chip into pulse mode. ever goes low, chip configured 3-wire mode until next power cycled. (Pin Ground. Ground should tied directly ground plane. (UP/DN)(Pin Data Input. 3-wire mode, data shifted into rising edge CLK. pulse mode, upon power-up logic high puts counter into increment-only mode. ever goes low,
1329
LTC1329-10/LTC1329-50 FullScale Current Temperature
LTC1329-10 3.3V V(IOUT) 0.45V
LTC1329-10/LTC1329-50 Supply Voltage Rejection
25°C V(IOUT) 0.45V LTC1329-50
LTC1329-50
LTC1329-10
TEMPERATURE (°C)
SUPPLY VOLTAGE
1329
1329
LTC1329-10/LTC1329-50 Bias Voltage Rejection (Zero-Scale Current)
IOUT BIAS VOLTAGE LTC1329-10 LTC1329-50
Maximum IOUT Bias Voltage Supply Voltage
25°C IOUT FULL-SCALE CURRENT
SUPPLY VOLTAGE
1329
1329 TPC09
LTC1329-10/ LTC1329-50/LTC1329A-50
FUNCTIONS
counter configured increment/decrement mode until power cycled. DOUT (Pin Data Output. 3-wire mode, every conversion DOUT serially outputs previous 8-bit data. pulse mode, DOUT three-stated.
BLOCK DIAGRA
POWER-ON RESET
(UP/DN) SHDN CONTROL LOGIC
TEST CIRCUITS
Voltage Waveforms
0.8V DOUT 2.4V 0.4V
1329 TC03
Load Circuit
1.4V DOUT 100pF
1329 TC01
LATCH LOGIC ONLY/ UP/DN
VOLTAGE REFERENCE SHDN
LATCH LOGIC MODE SELECT PULSE 3-WIRE
SHDN
8-BIT CURRENT
IOUT
8-BIT REGISTER/COUNTER UP/DN
9-BIT SHIFT REGISTER DOUT DOUT
1329
Voltage Waveforms
2.0V 0.8V
2.4V DOUT HI-Z HIGH DOUT HI-Z 0.4V
HI-Z HI-Z
1329 TC04
Load Circuit
DOUT 100pF
WAVEFORM WAVEFORM
1329 TC02
LTC1329-10/ LTC1329-50/LTC1329A-50
SERIAL OPERATI SEQUE
tCSLO tCKS tCSS DOUT Hi-Z tCKLO Hi-Z
1329
Figure 3-Wire Interface Timing Specification
APPLICATIONS INFORMATION
8-BIT CURRENT OUTPUT 8-bit, current output digital-to-analog (DAC) converters. each part, 8-bit output guaranteed monotonic digitally adjustable equal steps. Upon power internal register resets 10000000B output assumes midrange. current output (IOUT) biased from 2.5V 3.3V systems, respectively. LTC1329-10 features fullscale output 10µA trimmed room temperature (±5% over temperature), while LTC1329-50 features 50µA full scale accuracy grades; room temperature (±2% over temperature) LTC1329A-50 room temperature (±5% over temperature) LTC1329-50. versions include flexible serial digital interface which allows easy interconnection variety digital systems. DIGITAL INTERFACE Automatic Mode Selection LTC1329 family includes serial interface capable communicating with host system using three protocols; standard 3-wire mode, 2-wire up/down pulse mode 1-wire increment-only pulse mode. LTC1329 family designed auto-configure itself depending data presented diagram illustrating this auto detection behavior shown Figure power-up, interface 1-wire pulse mode. line ever goes will beginning valid 3-wire serial transfer) chip immediately reconfigures itself into 3-wire mode remains this mode until next time power cycled. stays high, LTC1329 family stays pulse mode watches UP/DN determine whether switch 2-wire mode. UP/DN ever goes will first time "down" command given) chip switches into 2-wire pulse mode remains this mode until next time power cycled. properly configured 1-wire system, UP/DN will stay high continuously will remain 1wire pulse mode. 2-wire pulse mode systems should give single "down" pulse sometime before first data pulses sent prevent LTC1329 family from staying 1-wire mode first several pulses happen "ups".
POWER-UP GOES STAYS HIGH
tCSHI
tCKHI
tCSH
tCKH
3-WIRE MODE (UP/DN) GOES
PULSE MODE STAYS HIGH
INCREMENT/ DECREMENT
INCREMENTONLY
1329
Figure LTC1329 Operating Mode
LTC1329-10/ LTC1329-50/LTC1329A-50
APPLICATIONS INFORMATION
Standard 3-Wire Mode (Figure Refer Serial Interface Operating Sequence Figure When operating 3-wire mode, LTC1329-10/ LTC1329-50/LTC1329A-50 will interface directly with most standard 4-wire serial interface systems. clock (CLK) input synchronizes data transfer with each input captured rising edge each output data shifted through DOUT falling edge. falling edge initiates data transfer brings DOUT three-state. serial 8-bit data representing setting shifted into pin. Simultaneously, previous setting shifted DOUT pin. After data shifted rising edge transfers data from input shift register into register. output assumes value DOUT returns high-impedance state. IOUT B0)IFULLSCALE/255
IOUT 0.1µF SHDN DOUT DOUT TIED TOGETHER HALF DUPLEX DATA TRANSFER
1329
IOUT
DOUT LTC1329
SHDN
Figure 3-Wire Mode; Serial Interface (3-Wire Control DIN)
1-Wire Interface (Pulse Mode, Figure 1-wire pulse mode, each rising edge increments upper bits register count. When incramented beyond 11111100B, counter rolls over sets minimum value (00000000B). this way, single pulse applied increases output single 4-LSB step pulses decrease output step. last LSBs always zero pulse mode. IOUT 0)IFULLSCALE/255 configure 1-wire pulse mode, both pins VCC.
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
IOUT 0.1µF SHDN
IOUT
DOUT LTC1329
SHDN
1329
Figure Pulse Mode: Increment Only (1-Wire Control CLK)
2-Wire Interface (Pulse Mode, Figure 2-wire pulse mode, logic HIGH UP/DN programs register increment each rising edge increments upper bits register count. Similarly, logic UP/DN register decrement rising edge decrements upper bits register count. Each count 2-wire mode changes output single four step. register stops incramenting 11111100B stops decrementing 00000000B will roll over 2-wire pulse mode. last LSBs always zero pulse mode. IOUT 0)IFULLSCALE/255 configure 2-wire pulse mode, bring UP/DN least once during power-up.
IOUT 0.1µF SHDN UP/DN
IOUT
DOUT LTC1329
SHDN
1329 TA04
Figure Pulse Mode; Increment/Decrement (2-Wire Control UP/DN)
LTC1329-10/ LTC1329-50/LTC1329A-50
PACKAGE DESCRIPTIO
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.053 0.069 (1.346 1.752)
0.014 0.019 (0.355 0.483) *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.016 0.050 0.406 1.270
TYPICAL APPLICATIONS
Pulse Mode: Increment-Only (1-Wire Control CLK) with Voltage Output
100k VOUT
LT1006
VOUT (-IOUT)(RFB VBIAS) VBIAS VOUT
Digitally Controlled Power Supply Adjustment
ILIM 47µF LT1107 33µH VOUT (150mA) (14mA) 100µF IOUT DOUT (e.g., 8051)
1N5817 510k
*COILTRONICS CTX33-4
RELATED PARTS
PART NUMBER LTC1451 LTC1452 LTC8043 DESCRIPTION 12-Bit Micropower Serial Input VOUT 12-Bit Multiplying Serial Input VOUT 12-Bit Multiplying Serial Input IOUT COMMENTS Higher Resolution, 8-Pin Higher Resolution, 8-Pin Higher Resolution, 8-Pin
1329f LT/TP 0297 PRINTED
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417 (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 www.linear-tech.com
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.189 0.197* (4.801 5.004)
0.004 0.010 (0.101 0.254)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0.050 (1.270)
0996
IOUT
DOUT LTC1329
VBIAS
0.1µF SHDN
SHDN
3.3V, -15V VBIAS -15V VBIAS 2.5V
1329 TA02
LTC1329-50 SHDN
P1.2 P1.1 P1.0
1329 TA03
LINEAR TECHNOLOGY CORPORATION 1997

®1329-10/LTC1329-50/LTC1329A-50 micropower 8-bit current output conver

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