WM2639 Datasheet PDF - Wolfson Microelectronics plc
| Part Number | WM2639 | |
| Description | 12-Bit Parallel Input Voltage Output DAC with Internal Reference | |
| Manufacturers | Wolfson Microelectronics plc | |
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WM2639
12-Bit Parallel Input Voltage Output DAC
with Internal Reference
Production Data, July 1999, Rev 1.0
FEATURES
• 12-bit voltage output DAC
• Single supply 2.7V to 5.5V operation
• DNL ±0.3 LSBs, INL ±1.2 LSBs
• Internal programmable voltage reference
• Settling time 1µs typical
• 12-bit microprocessor compatible interface
• Power down mode 10nA
APPLICATIONS
• Battery powered test instruments
• Digital offset and gain adjustment
• Battery operated/remote industrial controls
• Machine and motion control devices
• Wireless telephone and communication systems
• Speech synthesis
• Arbitrary waveform generation
• Mass storage devices
DESCRIPTION
The WM2639 is a 12-bit voltage output, resistor string, digital-to-
analogue converter. A hardware controlled power down mode is
provided that reduces current consumption to 10nA. The device
has been designed to interface efficiently to industry standard
microprocessors and DSPs.
The WM2639 features an internal programmable voltage reference
simplifying overall system design. The reference voltage can also
be supplied externally.
Excellent performance is delivered with a typical DNL of 0.3 LSBs
and typical INL of 1.2 LSBs. The output stage is buffered by a x2
gain near rail-to-rail amplifier, which features a Class A output
stage (slow mode, Class AB). The 12 data bits are double buffered
enabling the output to be asynchronously updated under hardware
control. The settling time of the DAC is software programmable to
allow the designer to optimise speed versus power dissipation.
The device is available in a 20-pin TSSOP package. Commercial
temperature (0° to 70°C) and Industrial temperature (-40° to 85°C)
variants are supported.
ORDERING INFORMATION
DEVICE
WM2639CDT
WM2639IDT
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
20-pin TSSOP
20-pin TSSOP
BLOCK DIAGRAM
REF(12)
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
X1
1.024V/2.048V
SELECTABLE
REFERENCE
VDD
(11)
D[0-11]
(19,20, 1-10)
NWE (17)
NCS (18)
REG (15)
2-BIT
REFERENCE
SELECT
LATCH
12-BIT
INPUT
REGISTER
data
12-BIT
DAC
LATCH
2-BIT
CONTROL
LATCH
REFERENCE
INPUT
BUFFER
X1
POWERDOWN
CONTROL
DAC
OUTPUT
BUFFER
X2
POWER-ON
RESET
(14)
GND
(16)
NLDAC
WM2639
(13) OUT
TYPICAL PERFORMANCE
1
5V = VDD, VREF
0.8
0.4
0.2
-0.2
-0.4
-0.8
-1
512 1024
2048
2559
3583
4095
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
http://www.wolfson.co.uk
Production Data contain final specifications
current on publication date. Supply of products
conforms to Wolfson Microelectronics’ Terms
and conditions..
Master 15/07/99 15:02
©1999 Wolfson Microelectronics Ltd.
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Production Data
WM2639
Test Conditions:
RL = 10kΩ, CL = 100pF. VDD = 5V ± 10%, VREF = 2.048V and VDD = 3V ± 10%, VREF = 1.024V over recommended operating free-air
temperature range (unless noted otherwise)
PARAMETER
Signal to noise ratio
Signal to noise and distortion ratio
Total harmonic distortion
Spurious free dynamic range
Reference configured as input
SYMBOL
TEST CONDITIONS
SNR
fs = 480ksps, fOUT = 1kHz,
BW = 20kHz, TA=25°C
See Note 12
SNRD
fs = 480ksps, fOUT = 1kHz, BW
= 20kHz, TA=25°C
See Note 12
THD
fs = 480ksps, fOUT = 1kHz, BW
= 20kHz, TA=25°C
See Note 12
SPFDR
fs = 480ksps, fOUT = 1kHz, BW
= 20kHz, TA = 25°C
See Note 12
MIN
73
61
63
TYP
78
67
-69
74
MAX
UNIT
dB
dB
-62 dB
dB
Reference input resistance
Reference input capacitance
Reference feedthrough
Reference input bandwidth
Reference configured as output
RREFIN
CREFIN
VREF = 1VPP at 1kHz
+ 1.024Vdc, DAC code 0
VREF= 0.2VPP + 1.024V d.c.
DAC code 2048
Slow
Fast
10
55
-60
500
900
MΩ
pF
dB
kHz
kHz
Low reference voltage
High reference voltage
Output source current
Output sink current
VREFOUTL
VREFOUTH
IREFSRC
IREFSNK
VDD > 4.75V
1.003
2.027
-1
1.024
2.048
1.045
2.069
1
V
V
mA
mA
Load Capacitance
100 pF
PSRR
-48 dB
Digital Inputs
High level input current
Low level input current
Input capacitance
IIH Input voltage = VDD
IIL Input voltage = 0V
CI
1 µA
-1 µA
8 pF
Notes:
1. Integral non-linearity (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).
2. Differential non-linearity (DNL) is the difference between the measured and ideal 1LSB amplitude change of any adjacent two
codes. A guarantee of monotonicity means the output voltage changes in the same direction (or remains constant) as a change in
digital input code.
3. Zero code error is the voltage output when the DAC input code is zero.
4. Gain error is the deviation from the ideal full scale output excluding the effects of zero code error.
5. Power supply rejection ratio is measured by varying VDD from 4.5V to 5.5V and measuring the proportion of this signal imposed on
the zero code error and the gain error.
6. Zero code error and Gain error temperature coefficients are normalised to full scale voltage.
7. Output load regulation is the difference between the output voltage at full scale with a 10kΩ load and 2kΩ load. It is expressed as
a percentage of the full scale output voltage with a 10kΩ load.
8. IDD is measured while continuously writing code 2048 to the DAC. For VIH < VDD - 0.7V and VIL > 0.7V supply current will increase.
9. Typical supply current in power down mode is 10nA. Production test limits are wider for speed of test.
10. Slew rate results are for the lower value of the rising and falling edge slew rates.
11. Settling time is the time taken for the signal to settle to within 0.5LSB of the final measured value for both rising and falling edges.
Limits are ensured by design and characterisation, but are not production tested.
WOLFSON MICROELECTRONICS LTD
Production Data Rev 1.0 July 1999
5
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| Information | Total 10 Pages | |
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| Download | [ WM2639.PDF Datasheet ] | |
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