LTC1859 Linear Technology, LTC1859 Datasheet
LTC1859
Available stocks
Related parts for LTC1859
LTC1859 Summary of contents
Page 1
... Single 5V Supply ■ Software-Programmable Input Ranges 5V 10V, ±5V or ±10V Single Ended or Differential www.DataSheet4U.com ■ ±3LSB INL for the LTC1859, ±1.5LSB INL for the LTC1858, ±1LSB INL for the LTC1857 ■ Power Dissipation: 40mW (Typ) TM ■ SPI/MICROWIRE Compatible Serial I/O ■ ...
Page 2
... Digital Input Voltage (Note 4) ...... (DGND – 0.3V) to 10V Digital Output Voltage .... (DGND – 0.3V) to (DV Power Dissipation .............................................. 500mW www.DataSheet4U.com Operating Temperature Range LTC1857C/LTC1858C/LTC1859C ............ 0°C to 70°C LTC1857I/LTC1858I/LTC1859I .......... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec) ................. 300° ...
Page 3
... TYP ±5, ± 2.048 0 to 4.096 – ADC ±1.024 – ADC ±2.048 Hi ● LTC1858 LTC1859 MIN TYP MAX MIN TYP 83 87 –101 –101 –103 –103 –120 –120 1 1 –70 – ...
Page 4
... LTC1857/LTC1858/LTC1859 TER AL REFERE CE CHARACTERISTICS full operating temperature range, otherwise specifications are at T PARAMETER V Output Voltage REF V Output Temperature Coefficient REF V Output Impedance REF V Output Voltage REFCOMP U U DIGITAL I PUTS A D DIGITAL OUTPUTS full operating temperature range, otherwise specifications are at T ...
Page 5
... Note 8: Bipolar zero error is the offset voltage measured from – 0.5LSB when the output code flickers between 0000 0000 0000 0000 and 1111 1111 1111 1111 for the LTC1859, between 00 0000 0000 0000 and 11 1111 1111 1111 for the LTC1858 and between 0000 0000 0000 and 1111 1111 1111 for the LTC1857 ...
Page 6
... INPUT FREQUENCY (kHz) LTC1859 Channel-to-Channel Gain Error Matching vs Temperature 1.0 0.5 UNIPOLAR MODE 0 BIPOLAR MODE –0.5 –1.0 –50 – TEMPERATURE (° LTC1859 Typical DNL Curve 2.0 1.5 1.0 0.5 0 – 0.5 –1.0 –1.5 –2.0 –32768 0 32767 –16384 CODE 1859 TA02 LTC1859 Total Harmonic Distortion vs Input Frequency – ...
Page 7
... W TYPICAL PERFOR A CE CHARACTERISTICS LTC1859 Power Supply Feedthrough vs Ripple Frequency – 100kHz SAMPLE V = 60mV RIPPLE –20 –30 –40 –50 –60 www.DataSheet4U.com –70 –80 100 1k 10k 100k RIPPLE FREQUENCY (Hz CTIO S COM (Pin 1): Common Input. This is the reference point for all single-ended inputs. It must be free of noise and is usually connected to the analog ground plane ...
Page 8
... LTC1857/LTC1858/LTC1859 CTIO S DGND (Pin 24): Digital Ground. SDI (Pin 25): Serial Data Input. SCK (Pin 26): Serial Data Clock CTIO AL BLOCK DIAGRA www.DataSheet4U.com CH0 CH1 INPUT MUX • AND • RANGE • SELECT CH7 COM MUXOUT AGND1 TEST CIRCUITS Load Circuits for Access Timing ...
Page 9
... SDO t (SDI Setup Time Before SCK↑ SCK 2.4V SDI 0.4V t (SDO Valid Before BUSY↑ BUSY 2.4V SDO LTC1857/LTC1858/LTC1859 CONVST 50% BUSY 1859 TD01 t (Time from Previous Data Remains Valid After SCK↓) 7 SCK t 5 SDO 1859 TD03 RD 2.4V SCK 0.4V 1859 TD05 2 ...
Page 10
... DRIVING THE ANALOG INPUTS The nominal input ranges for the LTC1857/LTC1858/ LTC1859 are 10V, ±5V and ±10V and the MUX inputs are overvoltage protected to ±25V. The input impedance is typically 42kΩ in unipolar mode and 31kΩ ...
Page 11
... The LTC1857/LTC1858/LTC1859 have an on-chip, tem- perature compensated, curvature corrected, bandgap ref- erence, which is factory trimmed to 2.50V. The full-scale range of the LTC1857/LTC1858/LTC1859 is equal to ±5V 5V, ±10V 10V. The output of the reference is connected to the input of a gain of 1.6384x buffer through an 8k resistor (see Figure 3). The input to the ...
Page 12
... LTC1859, between 00 0000 0000 0000 and 011...111 011...110 000 ...
Page 13
... LTC1859, between 11 1111 1111 1110 and 11 1111 1111 1111 for the LTC1858 and between 1111 1111 1110 and 1111 1111 1111 for the LTC1857. ...
Page 14
... LTC1857/LTC1858/LTC1859 U U APPLICATIO S I FOR ATIO www.DataSheet4U.com 185789f ...
Page 15
... Figure 8. Examples of Multiplexer Options on the LTC1857/LTC1858/LTC1859 LTC1857/LTC1858/LTC1859 W U transfer cycle. As shown below, the result of a conversion is delayed by one conversion from the input word re- questing it. SDI SDI WORD 1 SDO SDO WORD 0 TRANSFER INPUT DATA WORD The LTC1857/LTC1858/LTC1859 8-bit data word is clocked into the SDI input on the first eight rising SCK edges ...
Page 16
... By applying a low distortion sine wave and analyzing the digital output using an FFT algorithm, the ADC’s spectral content can be examined for frequencies outside the fundamental. Figure 12 shows a typical LTC1859 FFT plot which yields a SINAD of 87dB and THD of – 101dB. SLEEP POWER DOWN MODE ...
Page 17
... U U APPLICATIO S I FOR ATIO www.DataSheet4U.com LTC1857/LTC1858/LTC1859 W U 185789f 17 ...
Page 18
... ADCs. Pay particular attention to the design of the analog and digital ground planes. The DGND pin of the LTC1857 FREQUENCY (kHz) Figure 12. LTC1859 Nonaveraged 4096 Point FFT Plot f = 100kHz SAMPLE f = 1kHz IN SINAD = 86.95dB THD = –101.42dB 35 ...
Page 19
... U U APPLICATIO S I FOR ATIO LTC1858/LTC1859 can be tied to the analog ground plane. Placing the bypass capacitor as close as possible to the power supply pins, the reference and reference buffer output is very important. Low impedance common returns for these bypass capacitors are essential to low noise opera- tion of the ADC, and the foil width for these tracks should be as wide as possible ...
Page 20
... LTC1857/LTC1858/LTC1859 TYPICAL APPLICATIO 5V COM 1 2 CH0 3 CH1 SINGLE-ENDED OR DIFFERENTIAL CHANNEL INPUT MUX SELECTION • AND (SEE TABLE 1) RANGE • INPUT RANGES: SELECT • 10V www.DataSheet4U.com ±5V AND ±10V 9 CH7 AGND1 MUXOUT 14 11 RELATED PARTS PART NUMBER DESCRIPTION Sampling ADCs ...