AS1543 datasheet(3/29 Pages) AMSCO

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AS1543/44

Data Sheet - P i n o u t

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Number Pin Name

Description

(see Figure 2)

VINx

Analog Inputs. 8/4 single-ended or 4/2 fully-differential analog input channels that are

multiplexed into the track-and-hold circuitry. Input channels are selected by using address

bits ADDR3:ADDR0 (page 14) of the control register. The address bits in conjunction with

bits SEQ (page 14) and SHADOW (page 14) allow the sequence register to be

programmed. The bit SE/FDN (page 14) of the control register selects single-ended or

fully-differential conversion mode. In case of single-ended mode the input range can

extend from [0V to VREFIN] or [0V to 2 x VREFIN]. In case of fully-differential mode the

differential input range can extend from [-VREFIN/2 to +VREFIN/2] or [-VREFIN to +VREFIN].

Note: Unused inputs should be connected to AGND to avoid noise.

REFIN

Reference Input. An external reference must be applied to this input. The voltage range

for the external reference is 2.5V ±1% for specified performance.

SCLK

Serial Clock. Provides the serial clock for accessing data from the part. This clock input is

also used as the clock source for the ADC conversion process

VDD

2.7 to 5.25V Supply Input. For the [0V to 2 x VREFIN] range, VDD must be between 4.75

and 5.25V

VDRIVE

Logic Power Supply Input. The voltage supplied at this pin determines the operating

voltage of the AS1543/44 serial interface. VDRIVE

≤ VDD required.

DOUT

Digital Output. The ADC conversion result is provided serially on this output. Data bits are

clocked out on the falling edge of SCLK. The data stream consists of four address bits

indicating the corresponding conversion channel, followed by 12 bits of conversion data

(MSB first). Output coding may be selected as straight binary or two’s complement

depending on the setting of bit CODING (page 14).

DIN

Digital Input. Data is clocked into to the AS1543/44 control register on this input (see

Control Register on page 14).

CSN

Chip Select. Active low input. Initiates conversions and also is used to frame the serial

data transfer.

AGND

Analog Ground. Ground reference point for all analog circuitry. All analog input signals

and any external reference signal should be referenced to pin AGND.

Note: AGND, GND and DGND pins must be connected together.

DGND

Digital Logic Ground. Ground reference point for the VDRIVE logic power supply input.

VDRIVE should be decoupled to pin DGND.

GND

Supply Ground. Ground reference point for the VDD supply input. The supply input VDD

should be decoupled to pin GND.

AS1543

10 REFIN

VDD

8GND

CSN

DIN

N/C

VIN0

VIN1

VIN2

VIN3

AS1544

10 REFIN

VDD

8GND

CSN

DIN

N/C

VIN0

VIN1

VIN2

VIN3

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