ltc2453 Linear Technology Corporation, ltc2453 Datasheet
ltc2453
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ltc2453 Summary of contents
Page 1
... V REF Following a single conversion, the LTC2453 can auto- matically enter a sleep mode and reduce its power to less than 0.2μA. If the user reads the ADC once a second, the LTC2453 consumes an average of less than 50μW from a 2.7V supply. 2.7V TO 5.5V 0.1μF 10μF SCL 2 2-WIRE I ...
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... REF REF Digital Voltage (SDA, SCL) ............ –0. Storage Temperature Range ................... –65°C to 150°C Operating Temperature Range LTC2453C ................................................ 0°C to 70°C LTC2453I ............................................. –40°C to 85°C ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL LTC2453CDDB#TRMPBF LTC2453CDDB#TRPBF ...
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... CONDITIONS ● The denotes the specifi cations which apply over the full operating temperature = 25°C. (Notes 2, 7) CONDITIONS (Note 3mA 0.1V ≤ V ≤ LTC2453 MIN TYP MAX UNITS ● ● ● V – 2.5 ...
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... Note 4. Integral nonlinearity is defi ned as the deviation of a code from a straight line passing through the actual endpoints of the transfer curve. Guaranteed by design and test correlation. Note 5. Input sampling current is the average input current drawn from the input sampling network while the LTC2453 is converting. = 2.7V to 5.5V CC Note capacitance of one bus line in pF ...
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... REF – REF – – –40 –60 –80 –100 100 1 10 100 1k 10k 100k FREQUENCY AT V (Hz) CC LTC2453 (T = 25°C, unless otherwise noted) A Transition Noise vs Temperature 3.0 2.5 2 4.1V CC 1 100 –50 – TEMPERATURE (°C) 2453 G05 ...
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... SDA (Pin 8): Bidirectional Serial Data Line of the I Interface. The conversion result is output through the SDA pin. The pin is high impedance unless the LTC2453 is in the data output mode. While the LTC2453 is in the data output mode, SDA is an open drain pull down (which requires an external 1.7k pull-up resistor to V Exposed Pad (Pin 9): Ground ...
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... POR time interval. Ease of Use The LTC2453 data output has no latency, fi lter settling delay or redundant results associated with the conversion cycle. There is a one-to-one correspondence between the conver- sion and the output data. Therefore, multiplexing multiple analog input voltages requires no special actions ...
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... The LTC2453 can only be addressed as a slave. It can only – transmit the last conversion result. The serial clock line GND, the output IN SCL, is always an input to the LTC2453 and the serial data + = GND – 8LSB = IN line SDA is bidirectional. Figure 3 shows the defi nition of 2 the I C timing. ...
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... V < lowed by successively less signifi cant bits (D13, D12…) until the LSB is output by the LTC2453. This sequence is shown in Figure 5. OPERATION SEQUENCE Continuous Read Conversions from the LTC2453 can be continuously read, see Figure 6. At the end of a read operation, a new conversion automatically begins ...
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... ACK, a STOP command will start a new conversion. PRESERVING THE CONVERTER ACCURACY The LTC2453 is designed to dramatically reduce the conver- sion result’s sensitivity to device decoupling, PCB layout, antialiasing circuits, line and frequency perturbations. Nev- ertheless, in order to preserve the high accuracy capability of this part, some simple precautions are desirable ...
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... Driving REF and REF A simplifi ed equivalent circuit for REF in Figure 8. Like all other A/D converters, the LTC2453 is only as accurate as the reference it is using. Therefore important to keep the reference line quiet by careful low and high frequency power supply decoupling. The LT6660 reference is an ideal match for driving the pin. The LTC6660 is available in a 2mm × ...
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... ground return line, which should be tied to the ADC GND pin using a star connection topology. Figure 10 shows the measured LTC2453 INL vs Input Voltage as a function 0.1μ some cases, R The input current is zero when the ADC is either in sleep or I/O modes. Thus, if the time constant of the input RC circuit τ ...
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... Figure 13. The converter noise level is about 1.4μV and can be modeled by a white noise source connected at the input of a noise-free converter related note, the LTC2453 uses two separate A/D converters to digitize the positive and negative inputs. Each of these A/D converters has 1.4μV noise. If one of the input voltages is within this small transition noise band, then the output will fl ...
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... GND GND 1μF 1μ 1.0Ω REF CC C1 0.1μ REF LTC2453 0.1μF – – – REF GND E3 0.1μF 0.1μ 0.1μ GND E6 – REF 14 DC1266A Demo Board Schematic ...
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... LTC DWG # 05-08-1702 Rev B) 0.70 ±0.05 PACKAGE OUTLINE 0.50 BSC 2.20 ±0.05 (2 SIDES 0.115 3.00 ±0.10 TYP R = 0.05 (2 SIDES) 5 TYP 2.00 ±0.10 (2 SIDES) 0.56 ± 0.05 (2 SIDES) 4 0.25 ± 0.05 0.75 ±0.05 0 – 0.05 BOTTOM VIEW—EXPOSED PAD LTC2453 0.40 ± 0.10 8 PIN 0.20 OR 0.25 × 45° CHAMFER 1 (DDB8) DFN 0905 REV B 0.50 BSC 2.15 ±0.05 (2 SIDES) 2453f 15 ...
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