LTC1860 Linear Technology, LTC1860 Datasheet
LTC1860
Available stocks
Related parts for LTC1860
LTC1860 Summary of contents
Page 1
... LTC1860/LTC1861 automatically power down to a typical supply current of 1nA between conversions. These 12-bit switched capacitor successive approximation ADCs include sample-and-holds. The LTC1860 has a differential analog input with an adjustable reference pin. The LTC1861 offers a software-selectable 2-channel MUX and an ad- justable reference pin on the MSOP version. ...
Page 2
... REF Analog Input Leakage Current C Input Capacitance (Notes 1, 2) Power Dissipation .............................................. 400mW Operating Temperature Range LTC1860C/LTC1861C ............................. LTC1860I/LTC1861I .......................... – 0.3V) CC Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C + 0.3V ORDER PART NUMBER CONV ...
Page 3
... V Low Level Output Voltage OL I Hi-Z Output Leakage OZ I Output Source Current SOURCE I Output Sink Current SINK I Reference Current (LTC1860 SO-8, MSOP and CONV = V REF LTC1861 MSOP) I Supply Current CC P Power Dissipation RECO E DED OPERATI G CO DITIO S full operating temperature range, otherwise specifications are T ...
Page 4
... LTC1860/LTC1861 CHARACTERISTICS range, otherwise specifications are Conditions, unless otherwise noted. SYMBOL PARAMETER t Conversion Time (See Figure 1) CONV f Maximum Sampling Frequency SMPL(MAX) t Delay Time, SCK to SDO Data Valid dDO t Delay Time, CONV to SDO Hi-Z dis t Delay Time, CONV to SDO Enabled ...
Page 5
... CODE Change in Offset vs Temperature 1 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1 –50 –25 25 TEMPERATURE ( C) LTC1860/LTC1861 Reference Current vs Reference Voltage 250kHz 100 125 V (V) REF 1860/61 G05 ...
Page 6
... IN 1860/61 G16 CTIO S LTC1860 V (Pin 1): Reference Input. The reference input defines REF the span of the A/D converter and must be kept free of noise with respect to GND. + – (Pins 2, 3): Analog Inputs. These inputs must be free of noise with respect to GND. ...
Page 7
... Positive Supply. This supply must be kept CC free of noise and ripple by bypassing directly to the analog ground plane CONV (SDI) SCK CONVERT BIAS AND CLK SHUTDOWN DATA IN + 12-BIT SAMPLING DATA OUT ADC – V REF LTC1860/LTC1861 is tied internally to this pin. REF SDO SERIAL PORT 12-BITS 1860/61 BD 18601f 7 ...
Page 8
... ADC. If “IN is grounded and V will result on “IN Reference Input The voltage on the reference input of the LTC1860 (and the LTC1861 MSOP package) defines the full-scale range of the A/D converter. These ADCs can operate with reference voltages from V ...
Page 9
... SDO ASIC, PLD, MPU, DSP OR SHIFT REGISTERS 4 5 GND CONV 1860 F03 Figure 3. LTC1860 with Rail-to-Rail Input Span minus 1LSB. See Figure 5. Both the “+” and = the “–” input in REF CC . The span of the A/D converter The voltage on the reference input CC ...
Page 10
... F tantalum. Keep the bypass capacitor leads as short as possible. Analog Inputs Because of the capacitive redistribution A/D conversion techniques used, the analog inputs of the LTC1860/ LTC1861 have capacitive switching input current spikes. These current spikes settle quickly and do not cause a problem if source resistances are less than 200 or high speed op amps are used (e ...
Page 11
... Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.014 – 0.019 0.050 (1.270) (0.355 – 0.483) TYP BSC LTC1860/LTC1861 3.00 0.102 (.118 .004) 0.52 (NOTE 3) (.206 REF 3.00 0.102 4.88 0.1 (.118 .004) ( ...
Page 12
... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 5V + 100 1/2 LT1492 – 100pF 5k 20k 8 V 5pF CC 10k LTC1860 IN – 0 100 1/2 LT1492 – 100pF 4 POWER DISSIPATION DESCRIPTION 1.3mW/1.7mW 1-Channel with Ref. Input (LTC1286), 2-Channel (LTC1298), 5V 75mW 1-Channel, Bipolar or Unipolar Operation, Internal Reference, 5V ...