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Details, datasheet, quote on part number:WM0834LIN
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| Part: | WM0834LIN |
| Category: | Data Conversion => ADC (Analog to Digital Converters) => Industrial |
| Description: | WM0834 : 8-BIT Quad Input ADC With Serial Interface |
| Company: | Wolfson Microelectronics Ltd. |
| Datasheet: | Download WM0834LIN datasheet File size : 701 kB |
| Request For quote: | Find where to buy WM0834LIN
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Datasheet text preview:
WM0834, WM0838
Production Data Sept 1996 Rev 2.0
8-Bit ADCs with Serial Interface and Configurable Input Multiplexer
Description
W M 0 8 3 4 and WM0838 are 8-bit analogue to digital converters (ADC) with configurable 4-input and 8-input multiplexers respectively and a serial I/O interface. Assignment of the multiplexer inputs is configured before each conversion via the serial data input to give single-ended or differential operation for the selected inputs. A mixture of input configurations can be used in the same application. WM0838 also has a pseudo-differential configuration where all 8 inputs can be refered to a common input at an arbitrary voltage. Serial communcation with WM0834/8 is via Data In (DI) and Data Out (DO) wires under the control of clock and chip select inputs. A high output at the SARS pin indicates when the conversion is in progress. To initiate a conversion chip enable is held low and data is input to DI on the rising edge of the clock, comprising, a start bit, and bits to set up the input configuration and polarity. After a half clock cycle delay conversion results appear at DO on the falling edge of the clock, MSB first, concurrently with A-D conversion. This is followed by the results LSB first, indicated by the falling edge of SARS. WM0838 has a shift enable (SE) input used to control the LSB first output on DO. WM0834/8 operate on 5V and 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 ADC0834 and ADC0838 without the Internal Zener Regulator Network 4-input (WM0834) or 8-input (WM0838) MUX options Reference input operates ratiometrically or with a fixed reference Input range 0 to Vcc with Vcc Reference 5V and 3.3V variants Total Unadjusted Error: ± 1 LSB 8-bit resolution Low Power 32 µs conversion time at fclock = 250 kHz Serial I/O interface WM0834 packages: 14 pin SO & DIP WM0838 packages: 20 pin wide-body SO & DIP
· · · · · · · · · ·
Applications
· · · · Embedding with remote sensors Equipment health monitoring Automotive Industrial control
Block Diagram
CS CLK DI VREF CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM AGND
1
Internal CS
Input Latch
Mux Select Start Conv
Vcc
Comparator
WM0834 4 Inputs
Input MUX
DAC & SAR Logic
Control Logic
SE
2
SARS
WM0838 8 Inputs
Output Shift Register
DO DGND
WM0834/8
Notes: 1. Internally tied to AGND for WM0834 2. Not available on WM0834
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
WM0834, WM0838
Pin Configuration
Top View WM0834 : N(DIP) and D (SO) packages WM0838: N(DIP) and DW (SO) packages
Ordering Information
5V devices DEVICE WM0834CN WM0834CD WM0834IN WM0834ID WM0838CN WM0838CDW WM0838IN WM0838IDW 3.3V devices DEVICE WM0834LCN WM0834LCD WM0834LIN WM0834LID WM0838LCN WM0838LCDW WM0838LIN WM0838LIDW TEMP. RANGE 0o C to 70oC 0o C to 70oC -40 oC to 85o C -40 oC to 85o C 0o C to 70oC 0o C to 70oC -40 oC to 85o C -40 oC to 85o C PACKAGE 14 pin plastic DIP 14 pin plastic SO 14 pin plastic DIP 14 pin plastic SO 20 pin plastic DIP 20 pin plastic SO 20 pin plastic DIP 20 pin plastic SO
WM0834 WM0838
TEMP. RANGE 0o C to 70oC 0o C to 70oC -40 oC to 85oC -40 oC to 85oC 0o C to 70oC 0o C to 70oC -40 oC to 85oC -40 oC to 85oC
PACKAGE 14 pin plastic DIP 14 pin plastic SO 14 pin plastic DIP 14 pin plastic SO 20 pin plastic DIP 20 pin plastic SO 20 pin plastic DIP 20 pin plastic SO
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) . . . . . . . . . 0 oC 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, DW or N 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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WM0834, WM0838
Electrical Characteristics (5V)
VCC = 5.0V, VREF = 5V, fCLK = 250 KHz, TA = TMIN to TMAX , tr = tf = 20ns, 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 mA VCC = 4.75 V, IOH = -10 mA 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 5 5 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
±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 Timing Parameters Setup time, CS low or data valid before clock Hold time, data valid after clock Propagation delay time, output data after clock Output disable time, DO after CS
tconv
Ri(REF)
1.3
2.4
5.9
ICC t su 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 350 90
0.6
1.25
mA ns ns
tpd t dis
125
1500 600 250 500
ns ns ns ns
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