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 (0
o
C to
70
o
C) and industrial (-40
o
C to 85
o
C) temperature ranges.
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
: 5V
0 to 4 V output (x 2 output range) at 5 V V
DD
0 to 2.5 V output (x 2 output range) at 3 V V
DD
Guaranteed monotonic output
•
•
•
Applications
•
•
•
•
•
•
Programmable d.c. voltage sources
Digitally controlled attenuator/amplifier
Signal synthesis
Mobile communications
Automatic test equipment
Process control
Pin Configuration
Top View
16 pin N and DW packages
DACB
DACA
GND
Data
CLK
V
DD
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
Ordering Information
DEVICE
WM5628CN
WM5628CDW
WM5628IN
WM5628IDW
WM5628LCN
WM5628LCDW
WM5628LIN
WM5628LIDW
TEMP. RANGE
0 C to 70 C
0
o
C to 70
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
0
o
C to 70
o
C
0
o
C to 70
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
o
o
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
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
© 1996 Wolfson Microelectronics
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
email: admin@wolfson.co.uk
www: http://www.wolfson.co.uk
WM5628L, WM5628
Block Diagram
V
DD
6
Ref 1
14
DAC
9
Latch
Latch
8
x2
2
DACA
DAC
9
Latch
Latch
8
x2
1
DACB
DAC
9
Latch
Latch
8
x2
16
DACC
DAC
9
Latch
Latch
8
x2
15
DACD
Ref 2
11
DAC
9
Latch
Latch
8
x2
7
DACE
DAC
9
Latch
Latch
8
x2
8
DACF
DAC
9
Latch
Latch
8
x2
9
DACG
DAC
9
Latch
Latch
8
x2
10
DACH
5
CLK
Data 4
Load 12
Serial Interface
Power-on-Reset
13
LDAC
3
GND
2
Wolfson Microelectronics
WM5628L, WM5628
(note 1)
Supply Voltage (VDD - VGND) . . . . . . . . . . . . +7V
Digital Inputs . . . . . . . . . . .GND - 0.3 V, V
DD
+ 0.3 V
Reference inputs . . . . . . . GND - 0.3 V, V
DD
+ 0.3 V
Absolute Maximum Ratings
Operating temperature range, TA . . . .
WM5628_C_ . . . . . . . . . . . . . .
WM5628_I_ . . . . . . . . . . . . . . .
Storage Temperature . . . . . . . . . .
Lead Temperature 1.6mm (1/16 inch)
from case for 10 secs . . . . . . . . .
. . T
MIN
to T
MAX
0oC to +70oC
-40oC to +85oC
-50oC to +150oC
. . . .
260
O
C
Recommended Operating Conditions
Supply voltage WM5628
Supply Voltage WM5628L
Reference input range
,
X1 gain
DAC output load resistance to GND
High level digital input voltage
Low level digital input voltage
Clock frequency
SYMBOL
V
DD
V
DD
V
REF
R
L
V
IH
V
IL
F
CLK
MIN
4.75
2.7
10
0.8 VDD
0.8
1
NOMINAL
MAX
5.25
5.25
V
DD
- 1.5
UNIT
V
V
V
kΩ
V
V
MHz
3.3
Electrical Characteristics: WM5628
V
DD
= 5 V, GND = 0 V, V
REF
= 2 V, R
L
= 10 kΩ, C
L
= 100 pF, T
A
= full range, unless otherwise stated.
PARAMETER
Power Supply
Supply current
Static Accuracy
Resolution
Monotonicity
Differential Nonlinearity
Integral Nonlinearity
Zero-code error
Zero-code error
temperature coefficient
Zero-code error supply
rejection
Full scale error
Full scale error
temperature coefficient
Full scale error supply
rejection
Output sink current
Output source current
SYMBOL
I
DD
TEST CONDITIONS
Outputs unloaded,
digital inputs = 0 V or V
DD
8
8
DNL
INL
ZCE
V
REF
= 2 V, Range x 2. (note 3)
V
REF
= 2 V, Range x 2. (note 4)
V
REF
= 2 V, Range x 2. (note 5)
Input code = 00 Hex (note 6)
Input code = 00 Hex,
V
DD
= 5 V ± 5 % (note 7)
V
REF
= 2 V, Range x 2. (note 8)
Input code = FF Hex (note 9)
Input code = FF Hex,
V
DD
= 5 V ± 5 % (note 10)
Each DAC output
± 0.1
± 0.9
± 1.0
30
MIN
TYP
MAX
4.0
UNIT
mA
10
0.5
± 60
± 25
0.5
20
2
Bits
Bits
LSB
LSB
mV
µV/
O
C
mV/V
mV
µV/
O
C
mV/V
µA
mA
FSE
I
O(SINK)
I
O(SOURCE)
Wolfson Microelectronics
3
WM5628L, WM5628
Electrical Characteristics: WM5628L
V
DD
= 3 .6V, GND = 0 V, V
REF
= 2 V x 1 gain, R
L
= 10 kΩ, C
L
= 100 pF, T
A
= full range, unless otherwise stated.
PARAMETER
Power Supply
Supply current
Static Accuracy
Resolution
Monotonicity
Differential Nonlinearity
Integral Nonlinearity
Zero-code error
Zero-code error
temperature coefficient
Full scale error
Full scale error
temperature coefficient
Output sink current
Output source current
Power supply
sensitivity
SYMBOL
I
DD
TEST CONDITIONS
V
DD
= 3.3v
8
8
DNL
INL
ZCE
V
REF
= 1.25 V, Range x 2. (note 3)
V
REF
= 1.25 V, Range x 2. (note 4)
V
REF
= 1.25 V, Range x 2. (note 5)
Input code = 00 Hex (note 6)
V
REF
= 1.25 V, Range x 2. (note 8)
Input code = FF Hex (note 9)
20
1
0.5
± 0.9
± 1.0
0
10
± 60
± 25
30
MIN
TYP
MAX
4
UNIT
mA
Bits
Bits
LSB
LSB
mV
µV/
O
C
mV
µV/
O
C
µA
mA
mV/V
FSE
I
O(SINK)
Each DAC output
I
O(SOURCE)
I
REF
VDD = 3.3V, V
REF
= 1.5V
PSRR
Electrical Characteristics: WM5628 & WM5628L
V
DD
= 2.7 to 5.5V, GND = 0 V, V
REF
= 2 V x 1 gain, R
L
= 10 kΩ, C
L
= 100 pF, T
A
= full range, unless otherwise stated.
PARAMETER
Digital Inputs
High level input current
Low level input current
Input capacitance
Timing Parameters
Data input setup time
Data input hold time
CLK to Load
Load to CLK
Load duration
LDAC duration
Load to LDAC
Reference Inputs
Reference input
voltage
Reference input
capacitance
Reference
feedthrough
Channel to channel
isolation
SYMBOL
I
IH
I
IL
C
I
t
SD
t
HD
t
HL
t
SL
t
WL
t
WD
t
LD
V
REF
A, B, C, D, inputs
A, B, C, D, inputs
A, B, C, D inputs (note 11)
A, B, C, D inputs (note 12)
TEST CONDITIONS
V
I
= V
DD
V
I
= 0V
15
50
50
50
50
250
250
0
GND
15
-60
-60
V
DD
-1.5
MIN
TYP
MAX
±10
±10
UNIT
µA
µA
pF
ns
ns
ns
ns
ns
ns
ns
V
pF
dB
dB
4
Wolfson Microelectronics
WM5628L, WM5628
Electrical Characteristics: WM5628 & WM5628L
(continued)
V
DD
= 3 .6V, GND = 0 V, V
REF
= 2 V x 1 gain, R
L
= 10 kΩ, C
L
= 100 pF, T
A
= full range, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
Dynamic Performance
Output settling time
To 1/2LSB, VDD=3V & 5V (note 13)
Output slew rate
Input bandwidth
(note 14)
Large Signal Bandwidth
Measured at -3dB point
Digital Crosstalk
Clk = 1MHz sq wave measured at
DACA - DACD
Notes:
1. Absolute Maximum Ratings are stress ratings only.
Permanent damage to the device may be caused by
continuously operating at or beyond these limits.
Device functional operating range limits are given
under Recommended Operating Conditions.
Guaranteed performance specifications are given
under Electrical Characteristics at the test conditions
specified.
2. Total Unadjusted Error is the sum of integral linearity
error, zero code error and full scale error over the input
code range.
3. Differential Nonlinearity (DNL) is the difference
between the measured and ideal 1 LSB amplitude
change of any two adjacent codes. A guarantee of
monotonicity means the output voltage changes in the
same direction (or remains constant) as a change in
the digital input code.
4. Integral Nonlinearity (INL) is the maximum deviation of
the output from the line between zero and full scale
(excluding the effects of zero code and full-scale
errors).
5. Zero code error is the deviation from zero voltage
output when the digital input code is zero.
6. Zero code error temperature coefficient is given by:
6
ZCETC = (ZCE(T
max
- ZCE(T
min
)) /V
REF
x 10 / (T
max
- T
min
)
7. Zero-code Error Rejection Ratio (ZCE-RR) is
measured by varying the V
DD
voltage, from 4.5 to 5.5
V d.c., and measuring the proportion of this signal
imposed on the zero-code output voltage.
MIN
TYP
10
1
100
100
-50
MAX
UNIT
µs
V/µs
kHz
kHz
dB
8. Full-scale error is the deviation from the ideal full-scale
output (V
REF
- 1LSB) with an output load of 10kΩ
9. Full-Scale Temperature Co-efficient is given by:
FSETC = (FSE(T
max
) - FSE(T
min
)) / V
REF
x 10
6
/ T
max
- T
min
)
10. Full Scale Error Rejection Ratio (FSE-RR) is
measured by varying the V
DD
voltage from 4.5 to
5.5 V d.c. and measuring the proportion of this signal
imposed on the full-scale output voltage
11 Reference feedthrough is measured at a DAC output
with an input code = 00 Hex with a V
REF
input = 1 V
dc
+ 1 V
PP
at 10kHz
12. Channel to channel isolation is measured at a DAC
output with an input code of one DAC to FF Hex and
the code oa all other DACs to oo Hex with a V
REF
in-
put = 1 V
dc
+ 1 V
pp
at 10kHz
13 Setting time is the time for the output signal to remain
within ±0.5 LSB of the final measurement value for a
digital input code change of 00 Hex to FF Hex. For
WM 5628: V
DD
= 5V, V
REF
= 2V and range = x 2. For
WM5628L: V
DD
= 3, V
REF
= 1.25V and range = x 2.
14 Reference bandwidth is the -3dB bandwidth with an
input at V
REF
= 1.25 V
dc
=+ 2 V
pp
with a digital input
code of full-scale.
Wolfson Microelectronics
5
Power technology
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