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Details, datasheet, quote on part number:WM0831LCD
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| Part: | WM0831LCD |
| Category: | Data Conversion => ADC (Analog to Digital Converters) => Industrial |
| Description: | WM0831 : 8-BIT Differential Input ADC With Serial Interface |
| Company: | Wolfson Microelectronics Ltd. |
| Datasheet: | Download WM0831LCD datasheet File size : 548 kB |
| Request For quote: | Find where to buy WM0831LCD
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Datasheet text preview:
WM0831, WM0832
Production Data Sept 1996 Rev 2.1
8-Bit ADCs with Serial Interface and Differential or Dual Inputs
Description
W M 0 8 3 1 and WM0832 are 8-bit analogue to digital converters (ADC) with serial I/O interfaces, providing a choice of input configurations in 8-pin SO or DIP packages. WM0831 has a differential input, also configurable as a single ended input. A-D conversion results are serially output on Data Out (DO) under the control of clock and chip select inputs. The device has a separate voltage reference input. WM0832's two input multiplexer is configurable via the Data In (DI) serial input, as two single ended inputs or a single d i f f e r e n t i a l input. The voltage reference operates ratiometrically and is internally connected to the VCC pin. Conversion is initiated by bringing and holding chip select low while providing a clock input. With WM0831's fixed input configuration, the conversion result is output at DO on the clock's falling edges in MSB to LSB order. With WM0832's configurable input multiplexer, data is input to DI on the rising edges of the clock to setup the Mux and initiate conversion. Conversion results appear serially at DO on the falling edges of the clock, first in MSB to LSB order, and then repeated in LSB to MSB order. WM0831/2 operate on 5V or 3.3V supply voltages and are available in small outline and DIP packages for commercial (0 to 70oC) and industrial (-40 to 85oC) temperature ranges.
Features
· · · · · · · · · · · Functionally Equivalent to National Semiconductor ADC0831 and ADC0832 WM0831: Differential or single ended input WM0832: Two single ended inputs or a single differential input Ratiometric reference input (fixed for WM0832) Serial I/O interface Input range 0 to Vcc with Vcc Reference 8 pin package, SO or DIP 5V and 3.3V variants Total Unadjusted Error: ± 1 LSB 8-bit resolution 32 µs conversion time at fclock = 250 kHz
Applications
· · · · Embedding with remote sensors Equipment health monitoring Automotive Industrial control
Block Diagrams
WM0831
CS CLK DI
WM0832
Internal CS
VREF
Vcc
Vcc Input Latch
Mux Select Start Conv
Differential Input
IN+ IN-
CLK
CH0 CH1
Comparator
Input MUX
DAC & SAR Logic
GND
WM0831
Output Latch
DO
WM0832
GND
Output Shift Register
Control Logic
DAC & SAR Logic
Control Logic
Comparator
CS
VREF
DO
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
© 1996 Wolfson Microelectronics
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 email: admin@wolfson.co.uk www: http://www.wolfson.co.uk
WM0831, WM0832
Pin Configuration
Top View 8 pin P (DIP) and D (SO) packages
Ordering Information
5V devices DEVICE WM0831CP WM0831CD WM0831IP WM0831ID WM0832CP WM0832CD WM0832IP WM0832ID 3.3V devices DEVICE WM0831LCP WM0831LCD WM0831LIP WM0831LID WM0832LCP WM0832LCD WM0832LIP WM0832LID TEMP. RANGE 0oC to 70oC 0oC to 70oC -40oC to 85oC -40oC to 85oC 0oC to 70oC 0oC to 70oC -40oC to 85oC -40oC to 85oC PACKAGE 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO TEMP. RANGE 0oC to 70oC 0oC to 70oC -40oC to 85oC -40oC to 85oC 0oC to 70oC 0oC to 70oC -40oC to 85oC -40oC to 85oC PACKAGE 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO 8 pin plastic DIP 8 pin plastic SO
WM0831
WM0832
Absolute Maximum Ratings (note 1) Supply Voltage, Vcc (note 2) . . . . . . . . . . . 6.5 V Input voltage range: Digital Inputs . . . . GND - 0.3 V, VCC + 0.3 V Analogue inputs . . . GND - 0.3 V, VCC + 0.3 V Input current, any pin (note 3) . . . . . . ± 5 mA Total Input current for package . . . . . . ± 20 mA
Operating temperature range, TA . . . . TMIN to TMAX WM083_C_ (C suffix) . . . . . . . . . 0oC to +70o C WM083_I_ (I suffix) . . . . . . . . . . -40oC to +85o C Storage Temperature . . . . . . . . - 65oC to +150o C Soldering Information: Lead Temperature 1.6 mm (1/16) from case for 10 seconds: D or P package . . . . . . . 260o C
Recommended Operating Conditions (5V)
Supply voltage High level input voltage Low level input voltage Clock frequency Clock duty cycle (see Note 4) Pulse duration CS high Operating free-air temperature SYMBOL VC C VIH VIL fclock Dclk twH(CS) TA TA MIN 4.5 2 10 40 220 0 -40 70 85 NOMINAL 5 MAX 5.5 0.8 600 60 UNIT V V V KHz % ns o C
C suffix I Suffix
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WM0831, WM0832
Electrical Characteristics (5V)
Vcc = 5V, VREF = 5V,fCLK = 250KHz, TA = TMIN to TMAX, tr = tf = 20 ns, unless otherwise stated. PARAMETER Digital Inputs High level output voltage Low level output voltage High level input current Low level input current High level output (source) current Low level output (sink) current High impedance-state output current (DO) Input capacitance Output capacitance Converter and Multiplexer Total unadjusted error Differential Linearity Supply voltage variation error Common mode error Common mode input voltage range Standby input leakage current (note 10) SYMBOL VOH VOL IIH IIL IOH IOL IOZ CI Co TUE Vs(error) V ICR II(stdby) VREF = 5 V. (note 7) (note 8) VCC = 4.75 V to 5.25 V Differential mode (note 9) On-channel VI = 5 V at ON ch. Off-channel VI = 0 V at OFF ch. On-channel VI = 0 V at ON ch. Off-channel VI = 5 V at OFF ch. Excluding MUX addressing time TEST CONDITIONS VCC = 4.75 V, IOH = -360 µA VCC = 4.75 V, IOH = -10 µA VCC = 5.25 V, IOH = 1.6 mA VIH = 5 V VIL = 0 V VOH = 0 V VOL = VCC VO = 5 V VO = 0 V MIN 2.4 4.5 0.005 -0.005 -24 26 0.01 -0.01 0.4 1 -1 TYP MAX UNIT V V V µA µA mA mA µA µA pF pF LSB Bits LSB LSB V µA µA µA µA clock periods k
-6.5 8
3 -3
5 5 ±1 8 ±1/16 ±1/16 GND-0.05 VCC +0.05 1 -1 -1 1 8 ±1/4 ±1/4
Conversion time Reference Inputs Input resistance to reference ladder Total device Supply current WM0831 Supply current WM0832 Timing Parameters Setup time, CS low or WM0832 data valid before clock Hold time, WM0832 data valid after clock Propagation delay time, output data after clock Output disable time, DO after CS
tconv
Ri(REF)
Can only be tested for WM0831 1.3
2.4
5.9
ICC ICC t su
( note 11) 350
0.6 2.5
1.25 4.7
mA mA ns
th MSB data first. CL = 100 pF LSB data first. CL = 100 pF CL = 10 pF, RL = 10 k CL = 100 pF, RL = 2 k
90 1500 600 250 500 ns ns ns ns
ns
tpd t dis
125
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