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TC3400 Datasheet(PDF) 5 Page - Microchip Technology

No. de Pieza. TC3400
Descripción  1.8V, Low Power, 16-Bit Sigma-Delta A/D Converter
Descarga  16 Pages
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Fabricante  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
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TC3400 Datasheet(HTML) 5 Page - Microchip Technology

 
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© 2002 Microchip Technology Inc.
DS21409B-page 5
TC3400
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin SOIC)
(8-Pin PDIP)
Symbol
Description
1
IN+
Analog Input. This is the positive terminal of a true differential input consisting of IN+ and IN-.
VIN1 = (IN+ – IN-). See Section 1.0 Electrical Characteristics.
2
IN-
Analog Input. This is the negative terminal of a true differential input consisting of IN+ and IN-.
VIN = (IN+ – IN-) IN- can swing to, but not below, ground.
3REFIN
Analog Input. The converter’s reference voltage is the differential between this pin and ground times
two. It maybetieddirectlytoREFOUT or scaled using a resistor divider. Any user supplied reference
voltagelessthan1.25V maybeusedinplace of REFOUT.
4
GND
Ground Terminal.
5REFOUT
Analog Output. The internal reference connects to this pin. It may be scaled externally, if desired, and
tied to the REFIN input to provide the converter’s reference voltage. Care must be taken in connecting
external circuitry to this pin.
6
SDAT
Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while the
TC3400 is converting data, effectively providing a “busy” signal. After the conversion is complete,
every high to low transition on the SCLK pin puts a bit from the resulting data word on the SDAT pin
(from MSB to LSB).
7
SCLK
Digital Input. This is the microPort™ serial clock input. The TC3400 comes out of sleep mode and a
conversion cycle begins when this pin is driven low. After the conversion starts, each additional falling
edge (uptosix) detected onSCLK for t4 seconds reduces the A/D resolution by one bit. When the
conversion is complete, the data word can be shifted out on the SDAT pin by clocking the SCLK pin.
8VDD
Power Supply Input.


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