isl2671286 Intersil Corporation, isl2671286 Datasheet

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isl2671286

Manufacturer Part Number
isl2671286
Description
12-bit, 20ksps Sar Adc
Manufacturer
Intersil Corporation
Datasheet
12-Bit, 20kSPS SAR ADC
ISL2671286
The ISL2671286 is a sampling SAR-type ADC which features
excellent linearity over supply and temperature variations, and
provides a drop-in compatible alternative to all ADS1286
performance grades. The robust high impedance input
minimizes errors due to leakage currents, and specified
measurement accuracy is maintained with input signals up to
the supply rails.
The reference accepts inputs between 1.25V to 5.0V, providing
design flexibility in a wide variety of applications. The
ISL2671286 also features up to 8kV Human Body Model ESD
survivability.
The serial digital interface is SPI compatible and is easily
interfaced to all popular FPGAs and microcontrollers.
Operating from a 5V supply, power dissipation is 1.4mW at a
sampling rate of 20kSPS and just 15µW between conversions
utilizing the Auto Power-Down mode. These features make the
ISL2671286 an excellent solution for remote industrial
sensors and battery-powered instruments.
The ISL2671286 is available in an 8 Ld SOIC package and is
specified for operation over the industrial temperature range
of –40°C to +85°C.
November 1, 2011
FN7863.0
+IN
–IN
VREF
VREF
FIGURE 1. BLOCK DIAGRAM
+VCC
GND
1
LOGIC
SAR
INTERFACE
SERIAL
DCLOCK
DOUT
CS/SHDN
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
Features
• Drop-In Compatible with ADS1286 (All Performance Grades)
• Simple SPI-compatible Serial Digital Interface
• Guaranteed No Missing Codes
• 20kHz Sampling Rate
• +4.50V to +5.25V Supply
• Low 280µA Operating Current (20kSPS)
• Power-down Current between Conversions: 3µA
• Excellent Differential Non-Linearity (0.75LSB Max)
• Low THD: -83dB (Typ)
• Pb-Free (RoHS Compliant)
• Available in SOIC Package
Applications
• Remote Data Acquisition
• Battery Operated Systems
• Industrial Process Control
• Energy Measurement
• Data Acquisition Systems
• Pressure Sensors
• Flow Controllers
-1
-2
-3
3
2
1
0
All other trademarks mentioned are the property of their respective owners.
0
FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE
512
1024
|
Copyright Intersil Americas Inc. 2011. All Rights Reserved
1536
CODE
2048
2560
3072
3584
4096

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isl2671286 Summary of contents

Page 1

... Auto Power-Down mode. These features make the ISL2671286 an excellent solution for remote industrial sensors and battery-powered instruments. The ISL2671286 is available SOIC package and is specified for operation over the industrial temperature range of –40°C to +85°C. VREF ...

Page 2

... RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL2671286. For more information on MSL please see Tech Brief TB363. 2 ...

Page 3

... THD Total Harmonic Distortion SINAD Signal-to (Noise + Distortion) Ratio SFDR Spurious Free Dynamic Range 3 ISL2671286 Thermal Information Thermal Resistance (Typical SOIC Package (Notes 4, 5 PDIP Package (Notes Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C Case Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+100°C Pb-Free Reflow Profile ...

Page 4

... Conversion Time CONV t Delay Time, DCLOCK↓ to DOUT Data Valid dDO t Delay Time, CS/SHDN↑ to DOUT Hi-Z DIS t Delay Time, DCLOCK↓ to DOUT Enable EN 4 ISL2671286 = +5V 12.5kHz, f REF SAMPLE TEST CONDITIONS CS/SHDN = VCC t ≥ 640µs, f ≤ 25kHz CYC CLK = 80µs, f ...

Page 5

... SMPL (MSB) Note: (2) After completing the data transfer, additional clocks applied while CS/SHDN is low will result in indefinite transmission of zeros 5 ISL2671286 = 200kHz , unless otherwise noted. Typical values are at T (Continued) TEST CONDITIONS CLOAD = 100pF See test circuits; Figure 4 See test circuits; Figure 4 See operating sequence ...

Page 6

... DCLOCK t EN DOUT VOL = 0.4V VIH = 2.4V CS/SHDN t DIS DOUT 10% FIGURE 5. TIMING PARAMETER DEFINITIONS 6 ISL2671286 VIL = 0.8V DCLOCK t hDO DOUT VOH = VDD - 0.2V VIL = 0.8V DCLOCK t hDO DOUT VOL = 0.4V 50% CS/SHDN t SUCS DCLOCK 50% 50% CS/SHDN t CSD DCLOCK 50% FN7863.0 November 1, 2011 ...

Page 7

... REFERENCE VOLTAGE (V) FIGURE 8. CHANGE IN OFFSET vs REFERENCE VOLTAGE 0.5 0.4 0.3 0.2 CHANGE IN DNL (LSB) 0.1 0.0 -0.1 CHANGE IN INL (LSB) -0 REFERENCE VOLTAGE (V) FIGURE 10. CHANGE IN INTEGRAL LINEARITY AND DIFFERENTIAL LINEARITY vs REFERENCE VOLTAGE 7 ISL2671286 +25°C, +VCC = V A REF 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -55 FIGURE 7. REFERENCE CURRENT vs TEMPERATURE 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1 -55 FIGURE 9. CHANGE IN OFFSET vs TEMPERATURE ...

Page 8

... FREQUENCY (kHz) FIGURE 14. SIGNAL-TO-(NOISE + DISTORTION) vs FREQUENCY -40 -35 -30 -25 -20 INPUT LEVEL (dB) FIGURE 16. SIGNAL-TO-(NOISE + DISTORTION) vs INPUT LEVEL 8 ISL2671286 +25°C, +VCC = 10.0 0 FIGURE 13. DIFFERENTIAL LINEARITY ERROR vs CODE 100 ...

Page 9

... TEMPERATURE (°C) FIGURE 20. CHANGE IN GAIN vs TEMPERATURE 450 400 f = 12.5kHz SAMPLE 350 300 250 200 150 100 -55 -35 - TEMPERATURE (°C) FIGURE 22. SUPPLY CURRENT vs TEMPERATURE 9 ISL2671286 +25°C, +VCC = -10 -20 -30 -40 -50 -60 -70 -80 - FIGURE 19. POWER SUPPLY REJECTION vs RIPPLE FREQUENCY 3.0 2.5 2.0 1.5 1 ...

Page 10

... Typical Performance Characteristics otherwise specified. (Continued) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) FIGURE 24. DIGITAL INPUT LINE THRESHOLD vs SUPPLY VOLTAGE 10 ISL2671286 +25°C, +VCC = REF SAMPLE 10.0 1.0 0.1 0.01 -55 -35 -15 FIGURE 25. INPUT LEAKAGE CURRENT vs TEMPERATURE = 12.5kHz unless CLK SAMPLE 105 TEMPERATURE (°C) FN7863.0 November 1, 2011 ...

Page 11

... VREF FIGURE 26. SAR ADC ARCHITECTURAL BLOCK DIAGRAM ADC Transfer Function The output coding for the ISL2671286 is straight binary. The first code transition occurs at successive LSB values (i.e., 1 LSB, 2 LSB, and so on). The LSB size is VREF/4096. The ideal transfer characteristic of the ISL2671286 is shown in Figure 27. ...

Page 12

... IN 10 100 Reduced Reference Operation The ISL2671286 exhibits good linearity and gain over a wide range of reference voltages (see Figures 10 and 11). When operating at low values of VREF, offset errors and noise must be considered because of the reduced LSB size. Input errors can have a larger impact on performance when ...

Page 13

... GND pin on the ISL2671286 as possible. Avoid running digital lines under the device, as this couples noise onto the die. The analog ground plane should be allowed to run under the ISL2671286 to avoid noise coupling. Power supply lines to the device should use as large a trace as possible, to provide low impedance paths and to reduce the effects of glitches on the power supply line ...

Page 14

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see 14 ISL2671286 www.intersil.com/askourstaff http://rel.intersil.com/reports/search.php For additional products, see www ...

Page 15

... Package Outline Drawing M8.15 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE Rev 3, 3/11 INDEX AREA TOP VIEW 5.00 (0.197) 4.80 (0.189) 1.27 (0.050) 0.51(0.020) 0.33(0.013) SIDE VIEW “A 15 ISL2671286 DETAIL "A" 6.20 (0.244) 5.80 (0.228) 4.00 (0.157) 3.80 (0.150) 8° 0° 1 SEATING PLANE 1.75 (0.069) 2 1.35 (0.053) 3 -C- 4 0.25(0.010) 0.10(0.004) ...

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