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부품번호 | WM5621L 기능 |
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기능 | Low-power Quadruple 8-Bit DAC | ||
제조업체 | Wolfson Microelectronics plc | ||
로고 | |||
Low-power Quadruple 8-Bit DAC
WM5621L
Production Data
Jan. 1997 Rev. 1.0
Description
WM5621L is a quadruple 8-bit digital to analogue converter
(DAC) with buffered reference inputs (high impedance). The
DAC produces an output voltage that ranges between
either one or two times the reference voltage and GND. The
DAC is monotonic. The device operates from a single
supply in the range 2.7V to 5.5V. A power-on reset function
is incorporated to provide repeatable start-up conditions. A
global hardware shut-down terminal and the capacity to
shut-down each individual DAC with software are provided
to minimize power consumption.
WM5621L interfaces to all popular microcontrollers and
microprocessors via a three wire serial interface with CMOS
compatible, schmitt trigger, digital inputs. Alternatively a two
wire serial interface can be activated. An 11-bit command
word consists of eight bits of data, two DAC select bits and
a range bit for selection between the times one or times two
output range. The DACregisters are double buffered which
allows a complete set of new values to be written to the
device, and then under control of HWACT, all of the DAC
outputs are simultaneously updated.
Ideal in space critical applications WM5621L is available
in small outline and DIP packages and is characterized for
operation from -25oC to 85oC.
Block Diagram
Features
• Individual (or all) DAC's can be powered-down
• One low-power 8-bit voltage output DAC
• Three 8-bit voltage output DACs
• Fast serial interface (1 MHz max)
• Simple 2 or 3 wire interface
• Programmable for 1 or 2 times output range
• High impedance reference inputs for each DAC
• Simultaneous update facility
• Extended temperature range (-25oC to 85oC)
• Single supply operation, range 2.7 V to 5.5 V
• 0 to 4 V output (x2 output range) at 5 V VDD
• 0 to 2.5 V output (x2 output range) at 3 V VDD
• Low power specification:
All DACs on
: 3.6 mW at 3.6 V typ
: 6 mW at 5 V typ
Low power DAC
: 0.54 mW at 3.6V typ
All DAC's shutdown
: 0.18 mW at 3.6V typ
• Guaranteed monotonic output
Applications
• Mobile Communications
• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Automatic test equipment
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
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176
email: [email protected]
www: http://www.wolfson.co.uk
© 1996 Wolfson Microelectronics
WM5621L
Electrical Characteristics
VDD = 3 V to 3.6V, GND = 0 V, VREF = 1.25 V, RL = 10 kΩ, CL = 100 pF, x1 gain output range, TA = full range
unless otherwise stated.
PARAMETER
SYMBOL
CONDITIONS MIN TYP MAX UNIT
Output slew rate rising DACA
Output slew rate falling DACA
Output slew rate DACB,C,D
Output settling time rising
To 1/2 LSB, VDD=3V
0.8 V/µS
0.5 V/µS
1 V/µS
20 µS
DACA
Output settling time falling
To 1/2 LSB, VDD=3V
75 µS
DACA
Output settling time rising
To 1/2 LSB, VDD=3V
10 µS
DACB,C,D
Output settling time falling
To 1/2 LSB, VDD=3V
75 µS
DACB,C,D
Output settling time HWACT
To 1/2 LSB, VDD=3V
40 120* µS
or ACT↑ to output volts DACA
(note 14)
Output settling time HWACT
To 1/2 LSB, VDD=3V
25 75* µS
or ACT↑ to output volts
DACB,C,D (note 14)
Large signal Bandwidth
Measured at -3dB point
100 KHz
Digital crosstalk
CLK=1MHz sq. wave
-50 dB
measured at DACA-DACD
Reference feedthrough
A,B,C,D inputs (note 15)
-60 dB
Channel-to-channel isolation
5 Channel-to-channel isolation
when in shutdown
A,B,C,D inputs (note 16)
A,B,C,D inputs
-60 dB
-40 dB
Reference bandwidth DACA
note 17
20 kHz
Reference bandwidth
note 17
100 kHz
DACB,C,D
Notes:
3. This is tested by design but is not production tested.
4. This is measured with no load (open circuit output),
Vref = 1.25V, range = x2.
5. Integral Nonlinearity (INL) is the maximum deviation of
the output from the line between zero and full scale (ex-
cluding the effects of zero code and full-scale er-
rors).
6. Differential Nonlinearity (DNL) is the difference be-
tween 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.
7. Zero-scale error is the deviation from zero voltage
output when the digital input code is zero.
8. Zero scale error temperature coefficient is given by:
ZCETC = (ZCE(Tmax) - ZCE(Tmin))/V REF x 106/
(Tmax - Tmin)
9. Full-Scale error is the deviation from the ideal full-scale
output (Vref - 1LSB) with an output load of 10kΩ.
10. Full-Scale Temperature Coefficient is given by:
FSETC = (FSE(Tmax) - FSE(Tmin))/VREF x 106/
(Tmax - Tmin)
11. Zero-code Error Rejection Ratio (ZCE-RR) is
measured by varying the VDD voltage, from 4.75 to
5.25 V d.c., and measuring the proportion of this
signal imposed on the zero-code output voltage.
Wolfson Microelectronics
4
4페이지 WM5621L
Typical Performance Characteristics (continued)
Large Signal Frequency ResponseLarge Signal Frequency Response
Small Signal FrequencySmall Signal Frequency Response Response
5
0
-5
-10 VdVdD=D5V=, V5re.f0=,1V.2R5EVF+ 2=V1pp.25V + 2Vpp,
-15 RTeaRTmnegpaeemnr=agpt1ueexr,er=aI=ntp12uux5tr'e,CCoI=ndep2u=5t2o5CC5ode = 255
-20
-25
1000
10000
100000
FrequeFnrecquyenc(yK(KHHz) z)
1000000
5
0
-5
-10
-15
-20 VVdDdD==5V5, VVr,efV=R2EVF+=1V2pVp + 1Vpp,
-25 RRaanngege= 1=x,1Inxp,uItnCpoduet C= 2o5d5e = 255
-30 TTeemmppereartuaretu=re25='C25oC
-35
-40
-45
-50
1 10 100
FreqFureequnenccyy(KH(zK) Hz)
100 0
100 00
Wolfson Microelectronics
7
7페이지 | |||
구 성 | 총 14 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
WM5621L | Low-power Quadruple 8-Bit DAC | Wolfson Microelectronics plc |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |