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PDF WM2638 Data sheet ( Hoja de datos )
| Número de pieza | WM2638 | |
| Descripción | Dual 12-Bit Serial Input Voltage Output DAC with Internal reference | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM2638 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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WM2638
Dual 12-Bit Serial Input Voltage Output DAC
with Internal reference
Production Data, Rev 1.0, July 1999
FEATURES
• Two 12-bit voltage output DACs
• Single 2.7V to 5.5V supply operation
• DNL ±0.4 LSBs, INL ±2 LSBs
• Low power consumption
• 12mW typical in fast mode
• 6mW typical in slow mode
• TMS320, (Q)SPI™, and Microwire™ compatible
serial interface
• Programmable settling time 1µs or 3.5µs typical
• Power down mode 10nA
APPLICATIONS
• Battery powered test instruments
• Digital offset and gain adjustment
• Battery operated/remote industrial controls
• Machine and motion control devices
• Cellular telephones
• Wireless telephones and communication systems
• Speech synthesis
• Arbitrary waveform generation
ORDERING INFORMATION
DESCRIPTION
The WM2638 is a dual 12-bit voltage output, resistor string, digital-
to-analogue converter. A software controlled power down mode is
provided that reduces current consumption to 10nA.
The WM2638 features an internal programmable voltage reference
simplifying overall system design. A reference voltage may also be
supplied externally.
The device has been designed to interface efficiently to industry
standard microprocessors and DSPs, including the TMS320
family. The WM2638 is programmed with a 16-bit serial word
comprising of a latch address, mode control bits and DAC or
control data.
Excellent performance is delivered with a typical DNL of 0.4LSBs.
The programmable settling time allows the designer to optimise
speed versus power consumption. The output stage is buffered by
a x2 gain near rail-to-rail amplifier.
The device is available in an 8-pin SOIC package ideal for space-
critical applications. Commercial temperature (0° to 70°C) and
Industrial temperature (-40° to 85°C) variants are supported.
DEVICE
WM2638CD
WM2638ID
TEMP. RANGE
0° to 70°C
-40° to 85°C
PACKAGE
8-pin SOIC
8-pin SOIC
BLOCK DIAGRAM
REF(6)
REFERENCE
OUTPUT BUFFER
WITH OUPUT
ENABLE
X1
1.024V/2.048V
SELECTABLE
REFERENCE
VDD
(8)
c
DIN (1)
SCLK (2)
NCS (3)
16-BIT
SHIFT
REGISTER
AND
CONTROL
LOGIC
POWER-ON
RESET
(5)
AGND
2-BIT
REFERENCE
SELECT
LATCH
12-BIT
DAC A
LATCH
12-BIT
DAC B
HOLDING
LATCH
REFERENCE
INPUT
BUFFER
X1
REFERENCE
INPUT BUFFER
X1
12-BIT
DAC B
LATCH
DAC
OUTPUT
BUFFER
X2
(4) OUTA
DAC
OUTPUT
BUFFER
X2
(7) OUTB
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
WM2638
TYPICAL PERFORMANCE
1
5V = VDD, VREF = External, Speed = Fast mode, Load = 10k/100pF
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
512
1024
1536
2048
2559
DIGITAL CODE
3071
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 contains final specifications
current on publication date. Supply of products
conforms to Wolfson Microelectronics' Terms
and Conditions.
Last printed 15/07/99 15:58
©1999 Wolfson Microelectronics Ltd.
1 page  
WM2638
SERIAL INTERFACE
NCS
SCLK
DIN
tSUCSS
tWCL tWCH
D15
tSUDCLK
D14
tHDCLK
D13
Production Data
tSUCS1
tSUCS2
D12 D11 D0
Figure 1 Timing Diagram
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)
SYMBOL
tSUCSS
tSUSCS1
tSUSCS2
tWCL
tWCH
tSUDCLK
tHDCLK
TEST CONDITIONS
Setup time NCS low before SCLK low
Setup time, rising edge of SCLK to rising edge of NCS,
external end of write
Setup time, rising edge of SCLK to falling edge of NCS,
start of next write cycle
Pulse duration, SCLK high
Pulse duration, SCLK low
Setup time, data ready before SCLK falling edge
Hold time, data held valid after SCLK falling edge
MIN
10
10
5
25
25
10
5
TYP
MAX
UNIT
ns
ns
ns
ns
ns
ns
ns
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 July 99
5
5 Page 
WM2638
PACKAGE DIMENSIONS
D: 8 PIN SOIC 3.9mm Wide Body
e
8
B
5
EH
14
D
A A1
0.10 (0.004)
-C-
SEATING PLANE
L
h x 45o
α
Symbols
A
A1
B
C
D
e
E
h
H
L
α
Dimensions
(mm)
MIN MAX
1.35 1.75
0.10 0.25
0.33 0.51
0.19 0.25
4.80 5.00
1.27 BSC
3.80 4.00
0.25 0.50
5.80 6.20
0.40
0o
1.27
8o
Dimensions
(Inches)
MIN MAX
0.0532
0.0688
0.0040
0.0098
0.0130
0.0200
0.0075
0.0098
0.1890
0.1968
0.050 BSC
0.1497
0.1574
0.0099
0.0196
0.2284
0.2440
0.0160
0o
0.0500
8o
REF:
JEDEC.95, MS-012
NOTES:
A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS (INCHES).
B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE.
C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.25MM (0.010IN).
D. MEETS JEDEC.95 MS-012, VARIATION = AA. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS.
Production Data
DM009.B
C
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 July 99
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet WM2638.PDF ] | |
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