AD7294 Просмотр технического описания (PDF) - Analog Devices

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AD7294

12-Bit, Multichannel, DAC/ADC Temperature Sensor and Current Sense for Monitor and Control Applications

Analog Devices 

AD7294

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Preliminary Technical Data

RS2 (-) 1

RS2(+) 2

NC 3

AVDD1 4

AGND1 5

AGND2 6

AVDD2 7

D2(-) 8

D2(+) 9

D1(+) 10

D1(-) 11

AGND3 12

AVDD3 13

REFOUT / REFIN DAC 14

NC = NO CONNECT

PIN 1

INDICATOR

AD7294

TOP VIEW

(Not to scale)

42 NC

41 ISENSE 1 OVERRANGE

40 ISENSE 2 OVERRANGE

39 DVDD

38 DGND

37 VDRIVE

36 OPGND

35 SCL

34 SDA (I2C) / SDI (SPI)

33 AS0 (I2C) / SDO (SPI)

32 AS1 (I2C) / CSB (SPI)

31 AS2 (I2C) / ALERT (SPI)

30 ALERT (I2C) / AGND6 (SPI)

29 AGND5

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

1, 54

RS2(−), RS1(−)

2, 53

RS2(+), RS1(+)

3, 42, 52

NC

4, 7, 13, 22, 50

AVDD1 to AVDD5

5, 6, 12, 21,

29, 49, 51

8, 11

9, 10

14

AGND 1 to AGND7

D2(−), D1(−)

D2(+), D1(+)

REFOUT/REFIN DAC

15, 20, 23, 28

16, 19, 24, 27

OFFSET IN A to

OFFSET IN D

VOUT A to VOUT D

17, 18

25, 26

30

31 to 33

34

35

DAC OUT GND AB,

DAC OUT V+ AB

DAC OUT V+ CD,

DAC OUT GND CD

ALERT

AS2, AS1, AS0

SDA

SCL

Figure 4.

Description

Low-Side Connection for External Sense Resistor.

High-Side Connection for External Sense Resistor.

No Connection

Analog Supply Pins. These pins should be decoupled with a 0.1 µF ceramic capacitor and a 10 µF

tantalum capacitor. Operating range is 4.5 V to 5.5 V.

Analog Ground Reference Point. All AGND pins should be connected externally to the AGND

plane.

Analog Input. Connected to cathodes of the external temperature-sensing diodes.

Analog Input. Connected to anodes of the external temperature-sensing diodes.

The AD7294 contains a REFOUT/REFIN DAC pin common to all four DAC channels. When the

internal reference is selected, this pin is the reference output. If the application requires an

external reference, it can be applied to this pin, and the internal reference can be disabled via

the control register. The default for this pin is a reference input.

Used to set the desired output range for each DAC channel. Input range is 0 V to 5 V.

Buffered Analog Outputs for DAC Channels A to D. Each analog output is driven by an output

amplifier that can be offset using the offset in pin. DACs provide 12-bit resolution in a 5 V range,

providing an output voltage from 0 V to 15 V. Each output is capable of sourcing and sinking

10 mA and driving a 1,000 pF load.

Analog Supply Pins for Output Amplifiers on VOUTA and VOUTB.

Analog Supply Pins for Output Amplifiers on VOUTC and VOUTD.

Digital Output. This pin acts as an out-of-range indicator and becomes active when a conversion

result violates the DATAHIGH or DATALOW register values associated with each channel input.

Logic Inputs. These inputs are used to select unique addresses for the AD7294. Device address

depends on the voltage applied to these pins.

Digital I/O. Serial bus bidirectional data. Open-drain output.

Digital Input. Serial bus clock. The data transfer rate in I2C mode is compatible with both 100 kHz

Rev. PrB | Page 8 of 45

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