LTC1603 Linear Technology, LTC1603 Datasheet
LTC1603
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LTC1603 Summary of contents
Page 1
... Two digitally selectable power shutdown modes provide power savings for low power systems. The LTC1603’s full-scale input range is 2.5V. Outstand- ing AC performance includes 90dB S/(N+D) and – 100dB THD at a sample rate of 250ksps. The unique differential input sample-and-hold can acquire single-ended or differential input signals up to its 15MHz bandwidth ...
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... REFCOMP Voltage (Note 4) ......... – 0. Digital Input Voltage (Note 4) ....................– 0.3V to 10V Digital Output Voltage .................. – 0. Power Dissipation ............................................. 500mW Operating Temperature Range LTC1603C .............................................. LTC1603I ............................................ – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 VERTER ...
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... A DD OUT V = 4.75V 160 A DD OUT V = 4.75V 1.6mA DD OUT High OUT DD CS High (Note 11 OUT OUT DD LTC1603 MIN TYP MAX – 100 – 94 – – 350 MIN TYP MAX 2.475 2.500 2.515 15 0.01 0.01 7 ...
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... C. (Note 5) A CONDITIONS (Note 11) (Notes 11, 12) (Notes 11, 12) (Notes 11, 12 Low (Note 12) (Note 12 25pF L (Note 12) (Note 12 25pF 100pF L LTC1603C LTC1603I (Note 12) (Note 12) MIN TYP MAX UNITS 4.75 5.25 V – 4.75 – 5. 1.5 2 100 A ...
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... For best performance ensure that CONVST returns high either within 250ns after conversion start or after BUSY rises 16384 32767 CODE 1603 G11 LTC1603 Differential Nonlinearity vs Output Code 1.0 0.8 0.6 0.4 0.2 0.0 –0.2 –0.4 – ...
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... LTC1603 PIN FUNCTIONS + A (Pin 1): Positive Analog Input. The ADC converts the IN + difference voltage between tial range of 2.5V. A has a 2.5V input range when IN – grounded. IN – A (Pin 2): Negative Analog Input. Can be grounded, tied voltage or driven differentially with A V (Pin 3): 2.5V Reference Output. Bypass to AGND with REF 2 ...
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... CONVST LOGIC 31 CONTROL AND RD 30 LINES TIMING BUSY OGND 16-BIT PARALLEL D15 TO D0 BUS 1603 TA01 Load Circuits for Output Float Delay ( Hi-Z ( Hi-Z 1603 TC02 LTC1603 L 1603f 7 ...
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... ZEROING SWITCHES (SHDN, CS, CONVST and RD) of the LTC1603 recognize HOLD inputs. The LTC1603 has a dedicated output supply pin (OV HOLD digital output pins (D0 to D15, BUSY) and allows the part to talk to either digital systems. The output is + two’ ...
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... F04 operation with a narrow logic low CONVST pulse. Mode 1b shows a narrow logic high CONVST pulse. In mode 2 (Figure tied low. The falling edge of CONVST signal starts the conversion. Data outputs are in LTC1603 ), accuracy is unaffected. CONV less than 500ns or greater than 5 ...
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... LTC1603 U U APPLICATIONS INFORMATION CONVST t 6 BUSY DATA (N – 1) DATA D15 TO D0 Figure 5. Mode 1a. CONVST Starts a Conversion. Data Outputs Always Enabled (CONVST = CONVST t 6 BUSY DATA (N – 1) DATA D15 TO D0 Figure 6. Mode 1b. CONVST Starts a Conversion. Data Outputs Always Enabled (CONVST = www ...
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... DATA (N – 1) D15 TO D0 Figure 9. ROM Mode Timing DIFFERENTIAL ANALOG INPUTS Driving the Analog Inputs The differential analog inputs of the LTC1603 are easy to drive. The inputs may be driven differentially single- ended input (i.e., the A – wanted signal that is common mode to both inputs will be reduced by the common mode rejection of the sample- and-hold circuit ...
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... If slower op amps are used, more settling time can be provided by increasing the time between conversions. The best choice for an op amp to drive the LTC1603 will depend on the application. Generally applications fall into two categories: AC applications where dynamic specifi- cations are most critical and time domain applications where DC accuracy and settling time are most critical ...
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... F Figure 11. RC Input Filter Input Range The 2.5V input range of the LTC1603 is optimized for low noise and low distortion. Most op amps also perform well over this same range, allowing direct coupling to the analog inputs and eliminating the need for special transla- tion circuitry ...
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... REF Full-Scale and Offset Adjustment Figure 15a shows the ideal input/output characteristics for the LTC1603. The code transitions occur midway between successive integer LSB values (i.e., – 0.5LSB, – 1.5LSB, – 2.5LSB,... FS – 1.5LSB, FS – 0.5LSB). The output is two’s complement binary with 1LSB = FS – ...
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... BOARD LAYOUT AND GROUNDING Wire wrap boards are not recommended for high resolu- tion or high speed A/D converters. To obtain the best performance from the LTC1603, a printed circuit board with ground plane is required. Layout should ensure that www.DataSheet4U.com digital and analog signal lines are separated as much as possible ...
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... 2 Figure 16. Power Supply Grounding Practice Figure 18a. This FFT of the LTC1603’s Conversion of a Full-Scale 10kHz Sine Wave Shows Outstanding Response with a Very Low Noise Floor When Sampling at 250ksps DIGITAL SYSTEM DGND OV OGND DD DD ...
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... N = [S/( – 1.76]/6.02 where N is the effective number of bits of resolution and S/( expressed in dB. At the maximum sampling rate of 250kHz the LTC1603 maintains above 14 bits up to the Nyquist input frequency of 125kHz (refer to Figure 19). Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of the RMS sum of all harmonics of the input signal to the fundamental itself ...
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... The full-linear bandwidth is the input frequency at which the S/( has dropped to 84dB (13.66 effective bits). The LTC1603 has been designed to optimize input band- width, allowing the ADC to undersample input signals with 80 100 120 frequencies above the converter’ ...
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... Plastic SSOP (5.3mm) (Reference LTC DWG # 05-08-1640) 1.25 0. 5.3 – 5.7 0.65 BSC – 8 0.65 (.0256) BSC 0.22 – 0.38 (.009 – .015) LTC1603 12.50 – 13.10* (.492 – .516 7.40 – 8.20 (.291 – .323 ...
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... LTC1603 TYPICAL APPLICATION Using the LTC1603 and Two LTC1391s as an 8-Channel Differential 16-Bit ADC System 5V + LTC1391 CH0 CH0 CH1 D – – CH2 CH3 D OUT 5 12 CH4 CH5 CH6 CLK CH7 CH7 ...