WM2637 Datasheet PDF - Wolfson Microelectronics plc
| Part Number | WM2637 | |
| Description | Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference | |
| Manufacturers | Wolfson Microelectronics plc | |
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WM2637
Dual 10-Bit Serial Input Voltage Output DAC
with Internal Reference
Production Data, Rev 1.0, July 1999
FEATURES
• Dual 10-bit voltage output DAC
• Single 2.7V to 5.5V supply
• DNL ±0.1 LSBs, INL ±0.4 LSBs
• Internal programmable voltage reference
• Low power consumption:
• 5.5 mW, slow mode - 5V supply
• 3.3 mW, slow mode - 3V supply
• TMS320, (Q) SPITM, and MicrowireTM compatible serial
interface
• Programmable settling time of 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
• Wireless telephone and communication systems
• Speech synthesis
• Arbitrary waveform generation
DESCRIPTION
The WM2637 is a dual 10-bit voltage output, resistor string, digital-
to-analogue converter. A software controlled power down mode is
provided that reduces current consumption to 10nA.
The WM2637 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 WM2637 is programmed with a 16-bit serial word
comprising of a latch address, mode DAC control bits and DAC or
control data.
Excellent performance is delivered with a typical DNL of 0.1 LSBs.
The programmable settling time allows the designer to optimize
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.
ORDERING INFORMATION
DEVICE
WM2637CD
WM2637ID
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
10-BIT
DAC A
LATCH
10-BIT
DAC B
HOLDING
LATCH
REFERENCE
INPUT
BUFFER
X1
REFERENCE
INPUT BUFFER
X1
10-BIT
DAC B
LATCH
DAC
OUTPUT
BUFFER
X2
(4) OUTA
DAC
OUTPUT
BUFFER
X2
(7) OUTB
2-BIT
CONTROL
LATCH
POWERDOWN/
SPEED
CONTROL
WM2637
TYPICAL PERFORMANCE
0.2
5V = VDD, VREF = External, Speed = Slow mode, Load = 10k/100pF
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
256 512
DIGITAL CODE
767
1023
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 15:56
©1999 Wolfson Microelectronics Ltd.
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WM2637
SERIAL INTERFACE
Production Data
NCS
SCLK
DIN
tSUCSS
tWCL tWCH
D15
tSUDCLK tHDCLK
D14
D13
tDCS1
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
tSUCS1
tSUCS2
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
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for WM2637 electronic component. |
| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ WM2637.PDF Datasheet ] | |
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