CDP68HC68A2M Intersil Corporation, CDP68HC68A2M Datasheet

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CDP68HC68A2M

Manufacturer Part Number
CDP68HC68A2M
Description
CMOS Serial 10-Bit A/D Converter
Manufacturer
Intersil Corporation
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
CDP68HC68A2M
Manufacturer:
MOT
Quantity:
3 000
Part Number:
CDP68HC68A2M
Manufacturer:
INTERSIL
Quantity:
20 000
July 1998
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
Features
• 10-Bit Resolution
• 8-Bit Mode for Single Data Byte Transfers
• SPI (Serial Peripheral Interface) Compatible
• Operates Ratiometrically Referencing V
• 14 s 10-Bit Conversion Time
• 8 Multiplexed Analog Input Channels
• Independent Channel Select
• Three Modes of Operation
• On Chip Oscillator
• Low Power CMOS Circuitry
• Intrinsic Sample and Hold
• 16 Lead Dual-In-Line Plastic Package
• 20 Lead Dual-In-Line Small Outline Plastic Package
• Evaluation Board available - CDP68HC05C16BEVAL
Ordering Information
CDP68HC68A2E
CDP68HC68A2M
External Source
PART NUMBER
TEMP. RANGE
-40 to 85
-40 to 85
(
o
C)
|
Copyright
16 Ld PDIP
20 Ld SOIC
PACKAGE
©
Intersil Corporation 1999
DD
or an
E16.3
M20.3
CDP68HC68A2
PKG.
NO.
1
Description
The CDP68HC68A2 is a CMOS 8-bit or 10-bit successive
approximation analog to digital converter (A/D) with a
standard Serial Peripheral Interface (SPI) bus and eight mul-
tiplexed analog inputs. Voltage referencing is user selectable
to be relative to either V
analog inputs can range between V
The
successive approximation A/D conversion technique which
provides an inherent sample-and-hold function. An onchip
Schmitt oscillator provides the internal timing for the A/D
converter. The Schmitt input can be externally clocked or
connected to a single, external capacitor to form an RC
oscillator with a period of approximately 10-30ns per
picofarad.
Conversion times are proportional to the oscillator period. At
the
conversions take 14 s per channel. At the same frequency,
8-bit conversions consume 12 s per channel.
The versatile modes of the CDP68HC68A2 allow any
combination of the eight input channels to be enabled and
any one of the selected channels to be specified as the
“starting”
beginning with the starting channel. Nonselected channels
are skipped. Modes can be selected to: sequence from
channel to channel on command; sequence through
channels automatically, converting each channel one time;
or sequence repeatedly through all channels.
The results of 10-bit conversions are stored in 8-bit register
pairs (one pair per channel). The two most significant bits
are stored in the first register of each pair and the eight least
significant bits are stored in the second register of the pair.
To allow faster access, in the 8-bit mode, the results of
conversions are stored in a single register per channel.
A read-only STATUS register facilitates monitoring the
status of conversions. The STATUS register can simply be
polled or the INT pin can be enabled for interrupt driven
communications.
maximum
CDP68HC68A2
CMOS Serial 10-Bit A/D Converter
channel.
specified
Conversions
employs
DD
or analog channel 0 (AI0). The
frequency
SS
a
proceed
and V
switched
File Number
of
DD
1MHz,
.
sequentially
capacitor,
1963.3
10-bit

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CDP68HC68A2M Summary of contents

Page 1

... Evaluation Board available - CDP68HC05C16BEVAL Ordering Information TEMP. RANGE o PART NUMBER ( C) CDP68HC68A2E - CDP68HC68A2M - CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | http://www.intersil.com or 407-727-9207 Copyright CDP68HC68A2 CMOS Serial 10-Bit A/D Converter Description The CDP68HC68A2 is a CMOS 8-bit or 10-bit successive ...

Page 2

... ACC LATCH COMPARATOR 3 MOSI 8 CONTROL REGISTER 4 DATA REGISTERS (READ ONLY) 4 CAR CHOPPER STABILIZED COMPARATOR SUCCESSIVE APPROXIMATION 10-BIT CAPACITOR ARRAY CAPACITOR SWITCH ARRAY AI0 CDP68HC68A2M (SOIC) TOP VIEW OSC INT 2 19 AI1 MISO 3 18 AI2 MOSI 4 17 AI3 NC 5 ...

Page 3

Absolute Maximum Ratings DC Supply Voltage Range -0.5V to +7V DD (Voltage Referenced to V Terminal) SS Input Voltage Range, All Inputs ...

Page 4

Electrical Specification PARAMETER DIGITAL OUTPUTS: MISO, INT -40 A High Level Output V , MISO OH Low Level Output V , MISO, INT OL Three-State Output Leakage I , MISO, INT ...

Page 5

Through this specification the CDP68HC68A2 is referred to simply as the A2. Functional Pin Description OSC - Oscillator (Input/Output) This pin is user programmable. In the “external” mode, the clock input for the successive approximation logic is applied to OSC ...

Page 6

HIGH DATA REGISTER 0 LOW DATA REGISTER 0 $01 HIGH DATA REGISTER 7 $0E LOW DATA REGISTER 7 $0F DATA REGISTERS $10 MODE SELECT REGISTER $11 CHANNEL SELECT REGISTER $12 START ADDRESS REGISTER $13 STATUS REGISTER CONTROL/STATUS REGISTERS FIGURE ...

Page 7

Software Interface Reading and writing to the A2 can be performed in either single byte or multiple byte (burst) modes. Both modes begin the same way: a positive transition is applied high, it must first ...

Page 8

Mode Select Register (MSR) Address/Control: (R/W)0010000 - $10 Read/Write: Yes EXT The read/write register is used to select the various modes of operation of the A2. Bits 6 and ...

Page 9

CSR. After the specified channel is converted, subsequent conversions proceed in ascending order, skipping channels not selected in the CSR. Therefore, jamming the CAR with a non-selected channel number ...

Page 10

B2, CA1 Channel Address, bit 1. See discussion under CA2. B1, CA0 Channel Address, bit 0. See discussion under CA2. Data Registers Address/Control: 0000000 to 0000111 - $00 to $0F Read/Write: Read Only High DV DOV 0 0 H/L = ...

Page 11

When all channels have been converted the INT and ACC flags in the SR are set, the INT pin is driven low ( true in the MSR), the CIP flag is cleared, and, if active, the internal oscillator ...

Page 12

SIGNAL INPUT D2 FIGURE 5A. ANALOG INPUT DURING SAMPLE TIME SIGNAL INPUT D2 FIGURE 5B. ANALOG INPUT DURING HOLD AND IDLE TIME The time constant ( ) for the input network is ...

Page 13

Dual-In-Line Plastic Packages (PDIP INDEX N/2 AREA -B- -A- D BASE PLANE -C- SEATING PLANE 0.010 (0.25 NOTES: 1. Controlling Dimensions: INCH. In case of conflict between ...

Page 14

... All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reli- able. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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