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參數資料
| 型號： | WM2639 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | 12-Bit Parallel Input Voltage Output DAC with Internal Reference |
| 中文描述： | 12位并行輸入電壓輸出DAC，帶有內部參考 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 342K |
| 代理商： | WM2639 |
WM2639
12-Bit Parallel Input Voltage Output DAC
with Internal Reference
Production Data,
July
1999, Rev 1.0
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
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
.
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 1
μ
s 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
ORDERING INFORMATION
DEVICE
TEMP. RANGE
0
°
to 70
°
C
-40
°
to 85
°
C
PACKAGE
WM2639CDT
WM2639IDT
20-pin TSSOP
20-pin TSSOP
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.
BLOCK DIAGRAM
TYPICAL PERFORMANCE
(13) OUT
data
REF(12)
POWER-ON
RESET
D[0-11]
(19,20, 1-10)
NWE (17)
(14)
GND
POWERDOWN
CONTROL
REFERENCE
INPUT
BUFFER
WM2639
X1
X2
DAC
OUTPUT
BUFFER
NCS (18)
12-BIT
DAC
LATCH
12-BIT
INPUT
REGISTER
2-BIT
REFERENCE
SELECT
LATCH
1.024V/2.048V
SELECTABLE
REFERENCE
X1
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
VDD
(11)
(16)
NLDAC
2-BIT
CONTROL
LATCH
REG (15)
5V = VDD, V
REF
-1
-0.8
-0.4
-0.2
0.2
0.4
0.8
1
512
1024
2048
2559
3583
4095
D
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