±1LSB 18-Bit Serial DACs · Features n Maximum 18-Bit INL Error: ±1LSB over Temperature n...
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Features n Maximum 18-Bit INL Error: ±1LSB over Temperature n Guaranteed Monotonic over Temperature n Program or Pin-Strap Six Output Ranges: 0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V n 18-Bit Settling Time: 2.1μs n Glitch Impulse: 0.4nV • s (3V), 2nV • s (5V) n Temperature Drift: n ±0.2LSB INL Drift from –40°C to 85°C n ±0.25ppm/°C Gain Drift n ±0.15ppm/°C Bipolar Zero Drift n Power Supply Rejection: ±0.8LSB/V n Voltage-Controlled Offset and Gain Trims n Serial Interface with Readback of All Registers n Clear and Power-On Reset to 0V Regardless of Output Range n 2.7V to 5.5V Single Supply Operation n 48-Pin 7mm × 7mm LQFP Package (LTC2758) n 28-Lead SSOP Package (LTC2756) Single and Dual 18-Bit Precision DACs ±1LSB 18-Bit Serial DACs SoftSpan™ Selectable Output Spans CODE 0 65536 –1.0 INL (LSB) –0.8 –0.6 –0.4 –0.2 0.6 0.4 0.2 0 0.8 1.0 131072 196608 262143 ±10V Range V REFA V OUTA V OUTB V REFB V DD 2.7V to 5.5V 3-Wire SPI with Data Readback 90°C 25°C –45°C LT1468 LT1468 ±1LSB INL Max –10V –5V 0 5V 10V The LTC ® 2756 single and LTC2758 dual current output digital-to-analog converters (DACs) offer true 18-bit precision DC specifications with maximum ±1LSB INL and DNL over temperature. The fast settling time and low glitch impulse allows generation of high frequency and low noise output waveforms. Integrated precision resistors allow reference inversion, gain and offset adjustment and bipolar level-shift, eliminating expensive external precision resistors and gain stages. The 3-wire bidirectional serial SPI interface provides a software interface to set the DAC output span and enables readback of internal registers. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Transcript of ±1LSB 18-Bit Serial DACs · Features n Maximum 18-Bit INL Error: ±1LSB over Temperature n...
Featuresn Maximum 18-Bit INL Error: ±1LSB over Temperaturen Guaranteed Monotonic over Temperaturen Program or Pin-Strap Six Output Ranges:
0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10Vn 18-BitSettlingTime:2.1μsn GlitchImpulse:0.4nV•s(3V),2nV•s(5V)n Temperature Drift: n ±0.2LSB INL Drift from –40°C to 85°C n ±0.25ppm/°C Gain Drift n ±0.15ppm/°C Bipolar Zero Driftn Power Supply Rejection: ±0.8LSB/Vn Voltage-Controlled Offset and Gain Trimsn Serial Interface with Readback of All Registersn Clear and Power-On Reset to 0V Regardless of Output Rangen 2.7V to 5.5V Single Supply Operationn 48-Pin7mm×7mmLQFPPackage(LTC2758)n 28-LeadSSOPPackage(LTC2756)
Single and Dual 18-Bit Precision DACs
±1LSB 18-Bit Serial DACs
SoftSpan™ Selectable Output Spans
CODE
0 65536–1.0
INL
(LSB
)
–0.8
–0.6
–0.4
–0.2
0.6
0.4
0.2
0
0.8
1.0
131072 196608 262143
±10V Range
VREFA
VOUTA
VOUTB
VREFB
VDD2.7V to 5.5V
3-Wire SPIwith DataReadback
90°C25°C–45°C
LT1468
LT1468
±1LSB INL Max
–10V
–5V
0
5V
10V
The LTC®2756singleandLTC2758dualcurrentoutputdigital-to-analogconverters(DACs)offertrue18-bitprecisionDCspecifications with maximum ±1LSB INL and DNL over temperature. The fast settling time and low glitch impulse allows generation of high frequency and low noise output waveforms. Integrated precision resistors allow reference inversion, gain and offset adjustmentandbipolarlevel-shift,eliminatingexpensiveexternalprecisionresistorsandgainstages.The3-wirebidirectionalserialSPI interface provides a software interface to set the DAC output span and enables readback of internal registers.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
DAC ArchitectureTheLTC2756andLTC2758useacurrentoutputR-2Ror4-quadrantmultiplyingDACarchitecture.Thisarchitectureoffersmanyadvantages for high precision applications. The reference load impedance is constant and can be driven with an unbuffered reference or a slow low precision op amp with no impact on static or dynamic performance. Internal feedback and level-shift resistors simplify the output loop design and eliminate the need for external precision resistors. The unbuffered output and selectable voltage range give designers maximum flexibility to choose the best amplifier for their applications.
Single/Dual/Quad IOUT R-2R Multiplying DACs
150pF
VOSADJ
RCOMRIN ROFS
REF5V
REF RFB
IOUT1
VOUT IOUT2
GND
SPAN I/OS2-S0
GAINADJUST
GEADJ
27pF
VDD
OFFSETADJUST
LTC2756
18-BIT DAC WITH SPAN SELECT
LT1012
LT1468
+
–
–
+
0.1µF
5V
SPI WITHREADBACK
14-Bit
12-Bit
18-Bit
16-Bit
2757
2751-16
2758
2752
2751-14
2751-12 1590
2753-16
2753-14
2753-12
2754-16
2754-12
2755-16
2755-14
2755-12
2756
1592
1588
1589
SingleSerial I/O
SingleParallel I/O
DualSerial I/O
DualParallel I/O
QuadSerial I/O
Quad Parallel I/O
0811
www.linear.com/2758 n 1-800-4-LINEAR
