DataSheet.es    


PDF WM5621L Data sheet ( Hoja de datos )

Número de pieza WM5621L
Descripción Low-power Quadruple 8-Bit DAC
Fabricantes Wolfson Microelectronics plc 
Logotipo Wolfson Microelectronics plc Logotipo



Hay una vista previa y un enlace de descarga de WM5621L (archivo pdf) en la parte inferior de esta página.


Total 14 Páginas

No Preview Available ! WM5621L Hoja de datos, Descripción, Manual

Low-power Quadruple 8-Bit DAC
WM5621L
Production Data
Jan. 1997 Rev. 1.0
Description
WM5621L is a quadruple 8-bit digital to analogue converter
(DAC) with buffered reference inputs (high impedance). The
DAC produces an output voltage that ranges between
either one or two times the reference voltage and GND. The
DAC is monotonic. The device operates from a single
supply in the range 2.7V to 5.5V. A power-on reset function
is incorporated to provide repeatable start-up conditions. A
global hardware shut-down terminal and the capacity to
shut-down each individual DAC with software are provided
to minimize power consumption.
WM5621L interfaces to all popular microcontrollers and
microprocessors via a three wire serial interface with CMOS
compatible, schmitt trigger, digital inputs. Alternatively a two
wire serial interface can be activated. An 11-bit command
word consists of eight bits of data, two DAC select bits and
a range bit for selection between the times one or times two
output range. The DACregisters are double buffered which
allows a complete set of new values to be written to the
device, and then under control of HWACT, all of the DAC
outputs are simultaneously updated.
Ideal in space critical applications WM5621L is available
in small outline and DIP packages and is characterized for
operation from -25oC to 85oC.
Block Diagram
Features
• Individual (or all) DAC's can be powered-down
• One low-power 8-bit voltage output DAC
• Three 8-bit voltage output DACs
• Fast serial interface (1 MHz max)
• Simple 2 or 3 wire interface
• Programmable for 1 or 2 times output range
• High impedance reference inputs for each DAC
• Simultaneous update facility
• Extended temperature range (-25oC to 85oC)
• Single supply operation, range 2.7 V to 5.5 V
• 0 to 4 V output (x2 output range) at 5 V VDD
• 0 to 2.5 V output (x2 output range) at 3 V VDD
• Low power specification:
All DACs on
: 3.6 mW at 3.6 V typ
: 6 mW at 5 V typ
Low power DAC
: 0.54 mW at 3.6V typ
All DAC's shutdown
: 0.18 mW at 3.6V typ
• Guaranteed monotonic output
Applications
• Mobile Communications
• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Automatic test equipment
Production Data data sheets contain final
specifications current on publication date. Supply
of products conforms to Wolfson Microelectronics
standard terms and conditions
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
© 1996 Wolfson Microelectronics

1 page




WM5621L pdf
Electrical Characteristics (continued)
WM5621L
12. Full Scale Error Rejection Ratio (FSE-RR) is
measured by varying the VDD voltage, from 4.75 to
5.25 V d.c., and measuring the proportion of this
signal imposed on the full-scale output voltage.
13. Linearity is only specified for DAC codes 1 through
255.
14. The ACT bit is latched on falling edge of EN.
15. Reference feedthrough is measured at any DAC out-
put with an input code = 00 hex with a Vref input = 1Vdc
+ 1 Vpp at 10kHz.
16. Channel-to-channel isolation is measured by setting
the input code of one DAC to FF hex and the code of
all other DACs to 00 hex with Vref input = 1Vdc + 1
Vpp at 10kHz.
17. Reference bandwidth is the -3dB bandwidth with an
ideal input at Vref = 1.25 Vdc + 2 Vpp and with a dig-
ital input code of full-scale (range set to x1 and Vdd =
5V)
Typical Performance Characteristics
Typical DNL, INL and TUE at VDD = 5 V
Differential Nonlinearity
Vd d = 5 .0 V, Vre f = 2 .5 V , R ang e = x1 @
25'C VDD = 5.0, VREF = 2.5V, Range = x1 at 25oC
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
32 64 96 128 160 192 224
Input CCoodede
256
Total Unadjusted Error
V = 5.0, V = 2.5V, Range = x1 at 25 CDD REFVdd = 5.0 V, Vref = 2.5 V, Rang e = x 1 @ 25 'C
Total Unad justed Er ror
o
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
32 64 96 128 160 192
Input CCoodede
224
256
Integral Nonlinearity
V = 5.0, V = 2.5V, Range = x1 at 25 CVdd = 5 .0V, Vre f = 2. 5V, Ra ng e = x1 @ 25 'C
DD REF
I ntegral Non Li neari ty
o
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
32 64 96 128 160 192
InputCoCdeode
224
256
Differential Nonlinearity
V = 5.0, V = 2.0V, Range = x2 at 25 CDD REFVdd = 5 .0V, Vre f = 2 .0V, Ran ge = x2 @ 25 'C
Differenti al Non Li neari ty
o
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
32 64 96 128 160 192 224
Co d e
Input Code
256
Wolfson Microelectronics
5

5 Page





WM5621L arduino
Functional Description (continued)
Bit Control
Word
Start Bit 1
Register 0
Select
3 MODE
4 RNGA
5 RNGB
6 RNGC
7 RNGD
8 SIA
9 SIB
10 SIC
11 SID
12 ACT
Table 1
DACA
Write
1
1
0
0
D7
D6
D5
D4
D3
D2
D1
D0
DACB
Write
1
1
DACC
Write
1
1
DACD
Write
1
1
0 11
1 01
D7 D7 D7
D6 D6 D6
D5 D5 D5
D4 D4 D4
D3 D3 D3
D2 D2 D2
D1 D1 D1
D0 D0 D0
WM5621L
Bit Power-up state
Function
MODE
0 Control serial interface
RNG A
1 DACA range select
(0 = x1, 1 = x2)
RNG B
1 DACB range select
(0 = x1, 1 = x2)
RNG C
1 DACC range select
(0 = x1, 1 = x2)
RNG D
1 DACD range select
(0 = x1, 1 = x2)
SIA 0 DACA shutdown inhibit
SIB 0 DACB shutdown inhibit
SIC 0 DACC shutdown inhibit
SID 0 DACD shutdown inhibit
ACT
0 Software shutdown control
Table 2
SIA
0
0
0
0
1
1
1
1
Table 3
ACT
0
0
1
1
0
0
1
1
HWACT
0
1
0
1
0
1
0
1
DAC status
shutdown
shutdown
shutdown
active
active
active
active
active
Control Register
The control register contains 10 active bits. The MODE bit
controls the operation of the serial interface as described
above. The function of the control register bits, and their
state on power-up, are shown in table 2.
The shutdown state of each DAC is controlled through the
shutdown inhibit bit for that channel (SIx), the ACT bit of the
control register, and the HWACT pin. Table 3 shows the
logical action of these three controlling bits for DAC A. It is
possible, for example, to have any combination of DACs
switched from shutdown to active by the HWACT pin, while
the remaining DACs are held always active (achieve this by
setting ACT=1, SIx=0 for the switching DACs, and SIx=1 for
the always active DACs).
Linearity, offset, and gain error using
single end supplies
When an amplifier is operated from a single supply, the
voltage offset can still be either positive or negative. With
a positive offset, the output voltage changes on the first
code change. With a negative offset the output voltage
may not change with the first code depending on the
magnitude of the offset voltage.
The output amplifier, with a negative voltage offset,
attempts to drive the output to a negative voltage.
However, because the most negative supply rail is GND,
the output cannot drive to a negative voltage.
So when the output offset voltage is negative, the output
voltage remains at ZERO volts until the input code value
produces a sufficient output voltage to overcome the
inherent negative offset voltage, resulting in the transfer
function shown in Figure 5.
This negative offset error, not the linearity error, produces
this breakpoint. The transfer function would have followed
the dotted line if the output buffer could drive to a negative
voltage.
Wolfson Microelectronics
11

11 Page







PáginasTotal 14 Páginas
PDF Descargar[ Datasheet WM5621L.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
WM5621LLow-power Quadruple 8-Bit DACWolfson Microelectronics plc
Wolfson Microelectronics plc

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar