LTC2321-12 PIN FUNCTIONS REFOUT2 (Pin 26): Reference Buffer 2 Output. An onboard REFINT (Pin 28): Reference Buffer Output Enable. Tie to buffer nominally outputs 4.096V to this pin. This pin is VDD when using the internal reference. Tie to ground to referred to REFRTN2 and should be decoupled closely to disable the internal REFOUT1 and REFOUT2 buffers for the pin (no vias) with a 0.1µF (X7R, 0402 size) capacitor use with external voltage references. This pin has a 500k and a 10μF (X5R, 0805 size) ceramic capacitor in paral- internal pull-up to VDD. lel. The internal buffer driving this pin may be disabled by grounding the REFINT pin. If the buffer is disabled, Exposed Pad (Pin 29): Ground. Solder this pad to ground. an external reference may drive this pin in the range of 1.25V to VDD. REFRTN2 (Pin 27): Reference Buffer 2 Output Return. Bypass REFRTN2 to REFOUT2. Do not tie the REFRTN2 pin to the ground plane. FUNCTIONAL BLOCK DIAGRAM VDD 1,8 LDO VBYP1 13 AIN1+ 7 + LVDS/CMOS SDO1+ 15 12-BIT + SIGN THREE-STATE S/H SAR ADC SDO1– A SERIAL OUTPUT 16 IN1– 6 – 28 REFINT REFOUT1 GND 12 G 4, 5, 10, 29 1.2V REF OVDD 14 REFOUT2 26 G CLKOUT+ CNV TIMING CONTROL OUTPUT 17 9 LOGIC CLOCK DRIVER CLKOUT– 18 SCK+ LVDS/CMOS 21 RECEIVERS SCK– 22 A 2 IN2+ + LVDS/CMOS SDO2+ 19 12-BIT + SIGN THREE-STATE S/H SAR ADC SDO2– A SERIAL OUTPUT 20 IN2– 3 – VDD 1,8 VBYP2 24 LDO 232112 BD 232112fb 10 For more information www.linear.com/LTC2321-12 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Dynamic Accuracy Internal Reference Characteristics Digital Inputs And Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagram Applications Information Package Description Related Parts
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