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WM5628 Schematic ( PDF Datasheet ) - Wolfson Microelectronics plc

Teilenummer WM5628
Beschreibung 3 & 5V Octal 8-Bit Voltage Output DAC with Serial Interface
Hersteller Wolfson Microelectronics plc
Logo Wolfson Microelectronics plc Logo 




Gesamt 15 Seiten
WM5628 Datasheet, Funktion
WM5628L, WM5628
Production Data
Sept. 1996 Rev 2
3 & 5V Octal 8-Bit Voltage Output DAC
with Serial Interface
Description
WM5628L and WM5628 are Octal 8-bit digital to analogue
converters (DAC) controlled via a serial interface. Each
DAC's output voltage range is programmable for either x1
or x 2 its reference input voltage, allowing near rail to rail
operation for the x 2 output range. High impedance
buffered voltage reference inputs are provided for each
group of four DACs. WM5628L operates on a single
supply voltage of 3 V while WM5628 operates on 5 V.
WM5628/L interfaces to all popular microcontrollers and
microprocessors via a three wire serial interface with CMOS
compatible, schmitt trigger, digital inputs. An 12 bit
command word comprises 3 DAC select bits, an output
range selection bit and 8-bits of data.
Individual or all DAC outputs are changed using
WM5628/L's double buffered DAC registers and the
separate LOAD and LDAC inputs. DAC outputs are
updated simultaneously by writing a complete set of new
values and then pulsing the LDAC input.
The DAC outputs are optimised for single supply
operation and driving ground referenced loads.
An internal power-on-reset function sets the DAC's input
codes to zero at power up.
Ideal in space critical applications WM5628/L is available
in wide-bodied and DIP packages for commercial (0oC to
70oC) and industrial (-40oC to 85oC) temperature ranges.
Pin Configuration
Features
• Eight 8-bit voltage output DAC's
• Three wire serial interface
• Programmable x1 or x 2 output range.
• Power-on-reset sets outputs to zero
• Buffered voltage reference inputs
• Simultaneous DAC output update
Key Specifications
• Single supply operation:
WM5628L : 3 V
WM5628 : 5 V
• 0 to 4 V output (x 2 output range) at 5 V VDD
• 0 to 2.5 V output (x 2 output range) at 3 V VDD
• Guaranteed monotonic output
Applications
• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Mobile communications
• Automatic test equipment
• Process control
Ordering Information
Top View
16 pin N and DW packages
DACB
DACA
GND
Data
CLK
VDD
DACE
DACF
1
2
3
4
5
6
7
8
16 DACC
15 DACD
14 Ref1
13 LDAC
12 Load
11 Ref2
10 DACH
9 DAC G
DEVICE
TEMP. RANGE
WM5628CN
0oC to 70oC
WM5628CDW
WM5628IN
WM5628IDW
WM5628LCN
WM5628LCDW
WM5628LIN
WM5628LIDW
0oC to 70oC
-40oC to 85oC
-40oC to 85oC
0oC to 70oC
0oC to 70oC
-40oC to 85oC
-40oC to 85oC
PACKAGE
16 pin plastic DIP
16 pin wide-bodied plastic SO
16 pin plastic DIP
16 pin wide-bodied plastic SO
16 pin plastic DIP
16 pin wide-bodied plastic SO
16 pin plastic DIP
16 pin wide-bodied plastic SO
Production Data data sheets contain
final specifications current on publication
date. Supply of products conforms to
Wolfson Microelectronics standard terms
and conditions
Wolfson Microelectronics © 1996 Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176
www: http://www.wolfson.co.uk






WM5628 Datasheet, Funktion
WM5628L, WM5628
Parameter Measurement Information
DACA
DACB
DACC
.
.
DACH
10K
CL - 100pF
Slewing Settling Time and Linearity Measurements
Typical Performance Characteristics
Typical DNL, INL and TUE * at VDD = 5 V
Diffe re ntia l Nonlinea rity
VDD = 5 V, Vref = 2.5 V, Rang e x 1, TA = 25oC
0.2
0.1
0
-0.1
-0.2
0
32 64 96 128 160 192 224 256
Input Code
Total Unadjusted Error
VDD = 5 V, Vref = 2.5 V, Rang e x 1, TA = 25oC
0.5
0.25
0
-0.25
-0.5
0
32 64 96 128 160 192 224 256
InputC ode
* see note 2
Integral Nonlinearity
VDD = 5 V, Vref =2.5 V, Ra ng e x 1, TA = 25o C
0.4
0.2
0
-0.2
0
32 64 96 128 160 192 224 256
Inp ut Code
Diffe re ntia l Nonline a rity
VDD = 5 V, Vref = 1.25 V, Ra ng e x 2, TA = 25oC
0.2
0.1
0
-0.1
-0.2
0
32 64 96 128 160 192 224 256
Input Code
6 Wolfson Microelectronics

6 Page









WM5628 pdf, datenblatt
WM5628L, WM5628
Functional Description (continued)
Using these inputs individual DACs can be updated using
one 12 bit serial input word and the LOAD pin. Using both
LOAD and LDAC, all or selected DACs can be updated
after an appropriate number of data words have been
inputted. Figures 3 &4 illustrate operation with the 8 clock
pulses available from some microprocessors. If the data
input is interrupted in this way the clock input must be held
low during the break in clock pulses.
The RNG bit controls the DAC output range. When RNG = 0
the output is between Vref(A,B,C,D) and GND and when
RNG = 1 the range is between 2 x Vref (A,B,C,D) and GND.
Serial Input DAC Address and Output Tables
A2 A1
00
00
01
01
10
10
11
11
A0 DAC Updated
0 DACA
1 DACB
0 DACC
1 DACD
0 DACE
1 DACF
0 DACG
1 DACH
D7 D6
00
00
D5 D4 D3
D2
000
0
000
0
D1
0
0
D0
0
1
Output Voltage
GND
(1/256) x Ref (1 + RNG)
0 1 1 1 1 1 1 1 (127/256) x Ref (1 + RNG)
1 0 0 0 0 0 0 0 (128/256) x Ref (1 + RNG)
1 1 1 1 1 1 1 1 (255/256) x Ref (1 + RNG)
12 Wolfson Microelectronics

12 Page





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