DAC7715 Digital to Analog Converter IC

23 October 2018 - 0 Comments

DAC7715 Digital to Analog Converter IC

DAC7715 Pinout

DAC7715 is a ‘Digital to Analog Converter’ chip designed by Texas Instruments and is available in SOIC-16 package only. The chip takes in 12 bit serial data and provides analog output at any one of selectable four output channels. An asynchronous reset clears all registers to either mid-scale (800H) or zero-scale (000H), selectable via the RESETSEL pin. The device can be powered from a single +15V supply or from dual +15V and –15V supplies.

Pin Configuration

DAC7715 is a 16 pin device as shown in figure and description for each pin is given below.

Pin	Name	Function
1	VCC	Positive Supply Voltage, +15V nominal
2	VOUTD	DAC D Voltage Output
3	VOUTC	DAC C Voltage Output
4	VREFL	Reference Input Voltage Low, Sets minimum output voltage for all DACs
5	VREFH	Reference Input Voltage High, Sets maximum output voltage for all DACs
6	VOUTB	DAC B Voltage Output
7	VOUTA	DAC A Voltage Output
8	VSS	Negative Supply Voltage, 0V or –15V nominal
9	GND	Ground
10	SDI	Serial Data Input
11	CLK	Serial Data Clock
12	CS	Chip Select Input
13	LOADDACS	All DAC registers become transparent when LOADDACS is LOW. They are in the latched state when LOADDACS is HIGH
14	LOADREG	The selected input register becomes transparent when LOADREG is LOW. It is in the latched state when LOADREG is HIGH
15	RESET	Asynchronous Reset Input. Sets DAC and input registers to either zero-scale (000H) or mid-scale (800H) when LOW. RESETSEL determines which code is active
16	RESETSEL	When LOW, a LOW on RESET will cause the DAC and input registers to be set to code 000H. When RESETSEL is HIGH, a LOW on RESET will set the registers to code 800H

Features and Electrical Characteristics of DAC7715

Four output channels
Low power consumption: 250mw (max)
Work on single +15V supply or from dual +15V and –15V supplies
Settling time: 10ms to 0.012%
12-bit linearity and Monotonicity at temperature range: –40°c to +85°c
Double-buffered data inputs
Small so-16 package
Maximum supply voltage VCC to GND: +16V
Maximum supply voltage VCC to VSS: +32V
Maximum operating temperature: –40°c to +85°c

Similar DAC ICs

DAC8814 and DAC8811

Overview of DAC7715 IC

DAC7715 is basically used in applications where DAC conversion is required and is preferred for small size battery powered application as the chip is in SOIC package and consumes very less power for operation. The chip being capable of working on dual power, comes in handy in some applications. In addition being able to provide four analog outputs by taking in serial input by a single source is preferred in many microcontroller based applications.

How to use DAC7715 Chip

Below is a simple application circuit for DAC7715 which is already given in the datasheet.

DAC7715 Single Supply Operation Circuit

The above circuit is for single supply voltage of +15V and is called Basic Single Supply Operation Circuit. Here VREFH is connected to +10V to give positive reference voltage of +10V to DAC and VREFL is connected to ground to give negative reference voltage of 0V to DAC. With these references the voltages at the four outputs will range from 0V to +10V. Serial data is given in at SDI and Clock is given at Clock pin.

DAC7715 Dual Supply Operation Circuit

The above circuit is for dual supply voltage of +15V and -15, it is called Basic Dual Supply Operation Circuit. Here VREFH is connected to +10V to give positive reference voltage of +10V to DAC and VREFL is connected to -10V to give negative reference voltage of -10V to DAC. With these references the voltages at the four outputs will range from -10V to +10V. Serial data is given in at SDI and Clock is given at Clock pin.

The digital data is sent through SDI pin bit by bit and once the 12 bit serial data is sent followed by two channel selection bits the LOADDACS pin is pulled low for starting the conversion. The output will be available at set output channel after conversion.