Datasheet LTC2461, LTC2463 (Analog Devices) - 6

LTC2461/LTC2463
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted) Power Supply Rejection vs Frequency at VCC Conversion Time vs Temperature VREF vs VCC
0 T 21 1.24892 A = 25°C TA = 25°C VCC = 4.1V 1.24891 –20 20 1.24890 19 –40 VCC = 5V, 4.1V, 3V 1.24889 18 –60 (V) 1.24888 17 V REF REJECTION (dB) 1.24887 –80 CONVERSION TIME (ms) 16 1.24886 –100 15 1.24885 –120 14 1.24884 1 10 100 1k 10k 100k 1M 10M –50 –25 0 25 50 75 100 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 FREQUENCY AT VCC (Hz) TEMPERATURE (°C) VCC (V) 24613 G10 24613 G11 24613 G12
PIN FUNCTIONS REFOUT (Pin 1):
Reference Output Pin. Nominally 1.25V,
SDA (Pin 6):
Bidirectional Serial Data Line of the I2C Inter- this voltage sets the fullscale input range of the ADC. For face. The conversion result is output through the SDA pin. noise and reference stability connect to a 0.1µF capacitor The pin is high impedance unless the LTC2461/LTC2463 tied to GND. This capacitor value must be less than or is in the data output mode. While the LTC2461/LTC2463 equal to the capacitor tied to the reference compensation is in the data output mode, SDA is an open drain pull pin (COMP). REFOUT cannot be overdriven by an external down (which requires an external 1.7k pull-up resistor reference. For applications that require an input range to VCC). greater than 0V to 1.25V, please refer to the LTC2451/
REF– (Pin 8):
Negative Reference Input to the ADC. The LTC2453. voltage on this pin sets the zero input to the ADC. This
COMP (Pin 2):
Internal Reference Compensation Pin. For pin should tie directly to ground or the ground sense of low noise and reference stability, tie a 0.1μF capacitor to the input sensor. GND.
IN+ (LTC2463), IN (LTC2461) (Pin 9):
Positive input volt-
A0 (Pin 3):
Chip Address Control Pin. The A0 pin can be age for the LTC2463 differential device. ADC input for the tied to GND or VCC. If A0 is tied to GND, the LTC2461/ LTC2461 single-ended device. LTC2463 I2C address is 0010100. If A0 is tied to VCC, the
IN– (LTC2463), GND (LTC2461) (Pin 10):
Negative input LTC2461/LTC2463 I2C address is 1010100. voltage for the LTC2463 differential device. GND for the
GND (Pins 4, 7, 11):
Ground. Connect directly to the LTC2461 single-ended device. ground plane through a low impedance connection.
VCC (Pin 12):
Positive Supply Voltage. Bypass to GND with
SCL (Pin 5):
Serial Clock Input of the I2C Interface. The a 10μF capacitor in parallel with a low-series-inductance LTC2461/LTC2463 can only act as a slave and the SCL pin 0.1μF capacitor located as close to pin 12 as possible. only accepts external serial clock. Data is shifted into the
Exposed Pad (Pin 13 – DFN Package):
Ground. Connect SDA pin on the rising edges of SCL and output through directly to the ground plane through a low impedance the SDA pin on the falling edges of SCL. connection. 24613fa 6 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Applications Information Package Description Electrical Characteristics Analog Inputs Power Requirements I2c Inputs and Outputs I2c Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts