X79000 Datasheet, PDF (1/18 Pages) Intersil Corporation – NV DAC with Selectable Output Range and Memory

®
Data Sheet
X79000, X79001, X79002
March 17, 2005
FN8147.0
NV DAC with Selectable Output Range
and Memory
FEATURES
• 12-Bit Resolution
• Selectable full scale and zero scale voltages
• Optional External full scale and zero scale
references
• Programmable, non-volatile DAC initial value
register
• Optional UP/DOWN interface
• Guaranteed Monotonic Operation, <0.5LSB DNL
• Buffered Output Option
• Integrated Voltage Reference Option
• Voltage Reference Output (1.21V) Option
• 6 µs settling time, full scale
• SPI interface, 5MHz
• Up to 5 slave Address Pins
• Power-up recall and ready output
• 56 Bytes of general purpose EEPROM
• Asynchronous clear pin and control bit
• V_CC = 5V ±10%
• 20-lead TSSOP
• NV DAC
X79000 FUNCTIONAL DIAGRAM
DESCRIPTION
The X79000 is a family of Single Channel Non-Volatile
(NV) Digital-to-Analog Converters with integrated
voltage reference, configurable output buffer, general
purpose EEPROM, and selectable full scale and zero
offset voltages.
The X79000 series implements an SPI serial bus
interface with slave address identification allowing up
to 32 devices on some options. The full scale and
zero scale voltages and the DAC initial value register
can be set via the SPI bus interface. Optional pins
are provided for Up/Down style interface allowing for
increment and decrement of the DAC register in 1, 4,
or 16 steps at a time.
A Power-on Recall circuit is implemented to keep the
DAC output at high impedance on power-up and to load
an initial user defined value from non-volatile memory. A
power-up ready signal is provided to alert the system to
begin operations.
Additional general purpose non-volatile memory (56
Bytes) is provided for curve-fit profile setting, signal
conditioning parameters, or device and system
indentification.
Vcc
Vss
VH VL
Vref
RDY
A[2:0]
SCK
SO
SI
CS
Voltage
Reference
Power-up
Logic
Serial
Interface
and
Control
Logic
Variable Gain
& Level Shift
Variable Gain
& Level Shift
General
Purpose
EEPROM
DAC Initial
Value Register
DAC
Core
DAC Register
DAC Shift
Register
Vout
OE
+
Vbuf
–
VFB
CLR
UP
DOWN
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
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