LTC2309 Linear Technology Corporation, LTC2309 Datasheet
LTC2309
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LTC2309 Summary of contents
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... The ADC enters nap mode when not converting, reducing the power dissipation. The LTC2309 is available in a small 24-pin 4mm × 4mm QFN package. The internal 2.5V reference and 8-channel multiplexer further reduce PCB board space require- ments ...
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... Digital Input Voltage (Note 3) .................(GND – 0.3V) to (DV + 0.3V) DD Digital Output Voltage .... (GND – 0.3V) to (DV Power Dissipation ...............................................500mW www.DataSheet4U.com Operating Temperature Range LTC2309C ................................................ 0°C to 70°C LTC2309I.............................................. –40°C to 85°C Storage Temperature Range ................... –65°C to 150°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC2309CUF#PBF LTC2309CUF#TRPBF ...
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... A IN CONDITIONS f = 1kHz 1kHz 1kHz, First 5 Harmonics 1kHz 1kHz IN (Note 11) Full-Scale Step LTC2309 The l denotes the specifi cations = 25°C. (Notes MIN TYP MAX ±0.45 ±1 l ±0.35 ±1 l ±1 ±8 0.002 ±0.1 ± ...
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... LTC2309 INTERNAL REFERENCE CHARACTERISTICS operating temperature range, otherwise specifi cations are at T PARAMETER V Output Voltage REF V Output Tempco REF V Output Impedance REF V Output Voltage REFCOMP V Line Regulation REF INPUTS AND DIGITAL OUTPUTS operating temperature range, otherwise specifi cations are at T www ...
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... Note 11: Full linear bandwidth is defi ned as the full-scale input frequency at which the SINAD degrades to 60dB or 10 bits of accuracy. Note 12: C Note 13: REFCOMP wake-up time is the time required for the REFCOMP pin to settle within 0.5LSB at 12-bit resolution of its fi nal value after waking up from SLEEP mode. LTC2309 MIN TYP ...
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... LTC2309 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 5V Integral Nonlinearity vs Output Code 1.00 0.75 0.50 0.25 0 www.DataSheet4U.com –0.25 –0.50 –0.75 –1.00 0 1024 2048 OUTPUT CODE Supply Current vs Sampling Frequency 2.5 2.0 1.5 1.0 0 SAMPLING FREQUENCY (ksps) Supply Current vs Temperature 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 – –25 TEMPERATURE (° 14ksps, unless otherwise noted. ...
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... I Table 2 for address selection. SCL (Pin 16): Serial Clock Pin of the I LTC2309 can only act as a slave and the SCL pin only accepts an external serial clock. Data is shifted into the SDA pin on the rising edges of the SCL clock and output through the SDA pin on the falling edges of the SCL clock ...
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... LTC2309 FUNCTIONAL BLOCK DIAGRAM www.DataSheet4U.com TIMING DIAGRAM SDA t LOW t f SCL t HD(SDA START REPEATED START STOP CH0 CH1 CH2 + ANALOG CH3 INPUT – CH4 MUX CH5 CH6 CH7 INTERNAL 2.5V REF COM GND Defi nition of Timing for Fast/Standard Mode Devices on the I ...
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... The Driving the Analog Inputs IN The analog inputs of the LTC2309 are easy to drive. Each of the analog inputs can be used as a single-ended input relative to the COM pin (CH0-COM, CH1-COM, etc differential input pairs (CH0 and CH1, CH2 and CH3, CH4 and CH5, CH6 and CH7) ...
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... A simple 1-pole RC fi lter is suffi cient for many applications. – + – + The analog inputs of the LTC2309 can be modeled as – a 55pF capacitor ( – ON selected input once during each conversion. Large fi lter + – ...
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... RMS amplitude of all other fre- quency components at the A/D output. The output is band-limited to frequencies from above DC and below half the sampling frequency. Figure 5 shows a typical SINAD of 73.3dB with a 14kHz sampling rate and a 1kHz input. An SNR of 73.4dB can be achieved with the LTC2309. LTC2309 50Ω ANALOG CH0 INPUT ...
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... V through V 2 second through Nth harmonics. Internal Reference The LTC2309 has an on-chip, temperature compen- sated bandgap reference that is factory trimmed to 2.5V (Refer to Figure 6a internally connected to a reference amplifi er and is available at V should be bypassed to GND with a 2.2μF tantalum capacitor to minimize noise resistor is in series ...
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... The IN serial clock line (SCL) is always an input to the LTC2309 and the serial data line (SDA) is bidirectional. The device supports the standard mode and the fast mode for data transfer speeds up to 400kbits/s (see Timing Diagram section for defi ...
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... Figure 8a. Timing Diagram for Reading from the LTC2309 R/W S/D ACK BY ADC ADDRESS FRAME Figure 8b. Timing Diagram for Writing to the LTC2309 • • • • • • ACK BY MOST SIGNIFICANT DATA BYTE ...
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... Acquisition section). LTC2309 Address The LTC2309 has two address pins (AD0 and AD1) that may be tied high, low, or left fl oating to enable one of 9 possible addresses (see Table 2). ...
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... NAK a global read request. W ACK WRITE Sr 7-BIT ADDRESS DATA OUTPUT CONVERSION Figure 10. Write, Read, Start Conversion LTC2309 W ACK WRITE (OPTIONAL) NAP DATA OUTPUT Figure 11. Syncrhonous Multiple LTC2309s with a Global Address Call 2 C bus, all converters can be synchronized R ACK READ P DATA CONVERSION OUTPUT LTC2309 P ...
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... CONV ply current decreases to 210μA in nap mode between conversions, thereby reducing the average power dissipation as the sample rate decreases. For example, the LTC2309 draws an average of 300μ 1ksps sampling rate. The LTC2309 keeps only the reference www.DataSheet4U.com (V ) and reference buffer (REFCOMP) circuitry active REF when in nap mode ...
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... LTC2309 APPLICATIONS INFORMATION 011...111 BIPOLAR 011...110 000...001 000...000 111...111 111...110 100...001 www.DataSheet4U.com 100...000 –FS/2 INPUT VOLTAGE (V) Figure 14. Bipolar Transfer Characteristics (2’s Complement) Board Layout and Bypassing To obtain the best performance, a printed circuit board with a solid ground plane is required ...
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... BOTTOM VIEW—EXPOSED PAD R = 0.115 TYP 23 24 2.45 ± 0.10 (4-SIDES) 0.200 REF 0.25 ± 0.05 0.00 – 0.05 0.50 BSC LTC2309 PIN 1 NOTCH R = 0.20 TYP OR 0.35 45° CHAMFER 0.40 ± 0. (UF24) QFN 0105 2309f 19 ...
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... Easy Drive I LTC2493 LTC2495/LTC2497/ 8-/16-Channel Easy Drive I LTC2499 Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 Driving the LTC2309 with ±10V Input Signals Using a Precision Attenuator 1μF 10V 7 450k 10μF 0.1μF 4pF 100Ω ...