AD7945BNZ データシートの表示（PDF） - Analog Devices

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AD7945BNZ

+3.3 V/+5 V Multiplying 12-Bit DACs

Analog Devices 

AD7943/AD7945/AD7948

AD7943 PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Description

IOUT1

IOUT2

AGND

STB1

LD1, LD2

SRI

STB2

STB3

STB4

DGND

CLR

VDD

VREF

RFB

DAC current output terminal 1.

DAC current output terminal 2. This should be connected to the AGND pin.

This pin connects to the back gates of the current steering switches. In normal operation, it should be connected

to the signal ground of the system. In biased single-supply operation it may be biased to some voltage between

0 V and the 1.23 V. See Figure 11 for more details.

This is the Strobe 1 input. Data is clocked into the input shift register on the rising edge of this signal. STB3

must be high. STB2, STB4 must be low.

Active low inputs. When both of these are low, the DAC register is updated and the output will change to

reflect this.

Serial Data Input. Data on this line will be clocked into the input shift register on one of the Strobe inputs,

when they are enabled.

This is the Strobe 2 input. Data is clocked into the input shift register on the rising edge of this signal.

STB3 must be high. STB1, STB4 must be low.

This is the Strobe 3 input. Data is clocked into the input shift register on the falling edge of this signal. STB1,

STB2, STB4, must be low.

This is the Strobe 4 input. Data is clocked into the input shift register on the rising edge of this signal. STB3

must be high. STB1, STB2 must be low.

Digital Ground.

Asynchronous CLR input. When this input is taken low, all 0s are loaded to the DAC latch.

Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased

Mode Operation.

DAC reference input.

DAC feedback resistor pin.

AD7945 PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Description

IOUT1

AGND

DGND

DB11–DB0

CS

WR

VDD

VREF

RFB

DAC current output terminal 1.

This pin connects to the back gates of the current steering switches. The DAC IOUT2 terminal is also connected

internally to this point.

Digital Ground.

Digital Data Inputs.

Active Low, Chip Select Input.

Active Low, Write Input.

Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased Mode

Operation.

DAC reference input.

DAC feedback resistor pin.

REV. B

–9–

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